Tofacitinib Citrate

Recommended Evaluations and Immunization Prior to Treatment Initiation Prior to initiating tofacitinib extended-release tablets, consider performing an active and latent TB evaluation, viral hepatitis screening, a complete blood count, and updating immunizations. Avoid tofacitinib extended-release tablets initiation if absolute lymphocyte count < 500 cells/mm 3 , an absolute neutrophil count (ANC) < 1,000 cells/mm 3 or hemoglobin < 9 g/dL. ( 2.1 ) Important Administration Instructions Tofacitinib extended-release tablets are not substitutable with XELJANZ (tablets and oral solution). ( 2.2 ) Switching between XELJANZ and tofacitinib extended-release tablets should be made by the healthcare provider. ( 2.2 ) Recommended Dosage Adult Patients with RA, PsA or AS Tofacitinib extended-release tablets 11 mg once daily. ( 2.3 ) Adult Patients with UC Induction: Tofacitinib extended-release tablets 22 mg once daily for 8 weeks; evaluate patients and transition to maintenance therapy depending on therapeutic response. If needed, continue tofacitinib extended-release tablets 22 mg once daily for a maximum of 16 weeks. Discontinue tofacitinib extended-release tablets 22 mg once daily after 16 weeks if adequate therapeutic response is not achieved. ( 2.5 ) Maintenance: Tofacitinib extended-release tablets 11 mg once daily. For patients with loss of response during maintenance treatment, tofacitinib extended-release tablets 22 mg once daily may be considered and limited to the shortest duration, with careful consideration of the benefits and risks for the individual patient. Use the lowest effective dose needed to maintain response. ( 2.5 ) Dosage in Patients with Renal Impairment or Hepatic Impairment Use of tofacitinib extended-release tablets in patients with severe HI is not recommended. ( 2.3 , 2.5 , 8.7 ) See full prescribing information (FPI) for recommended dosage in patients with moderate or severe RI or moderate HI. ( 2.3 , 2.5 , 8.6 , 8.7 ) Dosage Modification See the full prescribing information for dosage modification by indication for patients who concomitantly use CYP2C19 and/or CYP3A4 inhibitors and patients with lymphopenia, neutropenia, or anemia. ( 2.3 , 2.5 , 7 )

2.1 Recommended Evaluations and Immunization Prior to Treatment Initiation Prior to initiating tofacitinib extended-release tablets, consider performing the following: Active and latent tuberculosis (TB) infection evaluation: If the patient has latent TB, treat for TB prior to tofacitinib extended-release tablets treatment [see Warnings and Precautions (5.1) ]. Viral hepatitis screening in accordance with clinical guidelines [see Warnings and Precautions (5.1) ]. A complete blood count: Avoid initiation of tofacitinib extended-release tablets treatment in patients with a lymphocyte count less than 500 cells/mm 3 , absolute neutrophil count less than 1000 cells/mm 3 , or hemoglobin level less than 9 g/dL [see Warnings and Precautions (5.9) ]. Baseline hepatic function evaluation: Tofacitinib extended-release tablets are not recommended for patients with severe hepatic impairment [see Use in Specific Populations (8.7) and Clinical Pharmacology (12.3) ]. Update immunizations according to current immunization guidelines. The interval between live vaccinations and initiation of tofacitinib extended-release tablets should be in accordance with current vaccination guidelines regarding immunosuppressive agents [see Warnings and Precautions (5.10) ].

2.2 Important Administration Instructions Tofacitinib extended-release tablets are not substitutable with XELJANZ (tablets and oral solution). Switching between XELJANZ and tofacitinib extended-release tablets should be made by the healthcare provider. Dose interruption is recommended for management of lymphopenia, neutropenia, and anemia [see Warnings and Precautions (5.9) and Adverse Reactions (6.1) ] . Interrupt use of tofacitinib extended-release tablets if a patient develops a serious infection until the infection is controlled [see Warnings and Precautions (5.1) ]. Take tofacitinib extended-release tablets with or without food [see Clinical Pharmacology (12.3) ] . Swallow tofacitinib extended-release tablets whole and intact. Do not crush, split, or chew the extended-release tablets [see Clinical Pharmacology (12.3) ].

2.3 Recommended Dosage in Adults with Rheumatoid Arthritis, Psoriatic Arthritis, and Ankylosing Spondylitis Table 1 displays the recommended dosage of tofacitinib extended-release tablets for adults with RA, PsA, and AS [see Indication and Usage (1.1 , 1.2 , 1.3) ] with and without renal impairment (including those who are undergoing hemodialysis) or hepatic impairment [see Use in Specific Populations (8.6 , 8.7) ]. The table also displays the recommended dosage modifications for patients concomitantly using CYP2C19 and/or CYP3A4 inhibitors [see Drug Interactions (7) and Clinical Pharmacology (12.3) ], and patients with lymphopenia, neutropenia, or anemia. Table 1: Recommended Dosage of Tofacitinib Extended-Release Tablets in Adults with Rheumatoid Arthritis, Psoriatic Arthritis, or Ankylosing Spondylitis Adults Tofacitinib extended-release tablets Patients with Normal Renal and Hepatic Function Excludes patients who concomitantly use XELJANZ tablets/tofacitinib extended-release tablets with strong CYP3A4 inhibitor(s) or moderate CYP3A4 inhibitor(s) and strong CYP2C19 inhibitor(s), as well as patients with lymphocyte count less than 500 cells/mm 3 , ANC < 1000 cells/mm 3 , or hemoglobin less than 8 g/dL or a decrease of more than 2 g/dL. 11 mg once daily Recommended Dosage in Patients with Renal Impairment (RI) Tofacitinib PK was evaluated in subjects with varying degrees of renal impairment, where the severity of renal impairment was defined based on creatinine clearance (CLcr) estimated using the Cockcroft-Gault equation: CLcr > 80 mL/min (normal renal function); > 50 and ≤ 80 mL/min (mild renal impairment); ≥ 30 and ≤ 50 mL/min (moderate renal impairment); < 30 mL/min (severe renal impairment). Mild RI (CLcr > 50 and ≤ 80 mL/min) 11 mg once daily Moderate RI (CLcr ≥ 30 and ≤ 50 mL/min) XELJANZ tablets 5 mg once daily Severe RI (CLcr < 30 mL/min) XELJANZ tablets 5 mg once daily For patients undergoing hemodialysis, administer the dose after the dialysis session on dialysis days. If a dose was taken before the dialysis procedure, supplemental doses are not recommended after dialysis Recommended Dosage in Patients with Hepatic Impairment (HI) Mild HI (Child-Pugh A) 11 mg once daily Moderate HI (Child-Pugh B) XELJANZ tablets 5 mg once daily Severe HI (Child-Pugh C) Use of XELJANZ tablets/tofacitinib extended-release tablets is not recommended. Dosage Modifications with Concomitant Use of CYP3A4 and/or CYP2C19 Inhibitor(s) Strong CYP2C19 inhibitor(s) 11 mg once daily Moderate CYP2C19 inhibitor(s) Moderate CYP3A4 inhibitor(s) Moderate CYP3A4 inhibitor(s) with strong CYP2C19 inhibitor(s) (e.g., fluconazole) XELJANZ tablets 5 mg once daily Strong CYP3A4 inhibitor(s) Dosage Modifications for Lymphopenia, Neutropenia, or Anemia Patients with lymphocyte count less than 500 cells/mm 3 , confirmed by repeat testing Discontinue dosing. Patients with ANC less than 500 cells/mm 3 Discontinue dosing. Patients with ANC 500 to 1,000 cells/mm 3 Interrupt dosing. When ANC is greater than 1,000, resume 11 mg once daily. Patients with hemoglobin less than 8 g/dL or a decrease of more than 2 g/dL Interrupt dosing until hemoglobin values have normalized. Switching from XELJANZ Tablets to Tofacitinib extended-release tablets Patients treated with XELJANZ tablets 5 mg twice daily may be switched to tofacitinib extended-release tablets 11 mg once daily the day following the last dose of XELJANZ tablets 5 mg.

2.5 Recommended Dosage in Adults with Ulcerative Colitis Table 3 displays the recommended dosage of tofacitinib extended-release tablets in adult patients with ulcerative colitis (UC) [see Indications and Usage (1.5) ] with and without renal impairment (including those who are undergoing hemodialysis) or hepatic impairment [see Use in Specific Populations (8.6 , 8.7) ]. Table 4 displays the recommended dosage modification for patients concomitantly using CYP2C19 and/or CYP3A4 inhibitors [see Drug Interactions (7) and Clinical Pharmacology (12.3) ] , and patients with lymphopenia, neutropenia, or anemia. Table 3: Recommended Dosage of Tofacitinib Extended-Release Tablets in Adults with Ulcerative Colitis With and Without Renal Impairment or Hepatic Impairment Adults Tofacitinib extended-release tablets Patients with Normal Renal and Hepatic Function Excludes patients who concomitantly use tofacitinib extended-release tablets with strong CYP3A4 inhibitor(s) or moderate CYP3A4 inhibitor(s) and strong CYP2C19 inhibitor(s), as well as patients with lymphocyte count less than 500 cells/mm 3 , ANC < 1,000 cells/mm 3 , or hemoglobin less than 8 g/dL or a decrease of more than 2 g/dL. Induction : 22 mg once daily for at least 8 weeks; evaluate patients and transition to maintenance therapy depending on therapeutic response. If needed continue 22 mg once daily for a maximum of 16 weeks. Discontinue 22 mg once daily after 16 weeks if adequate therapeutic response is not achieved. Maintenance : 11 mg once daily. For patients with loss of response during maintenance treatment, may consider a dosage of 22 mg once daily (limited to the shortest duration), with careful consideration of the benefits and risks for the individual patient. Use the lowest effective dose needed to maintain response. Recommended Dosage in Patients with Renal Impairment (RI) Tofacitinib PK was evaluated in subjects with varying degrees of renal impairment, where the severity of renal impairment was defined based on creatinine clearance (CLcr) estimated using the Cockcroft-Gault equation: CLcr > 80 mL/min (normal renal function); CLcr > 50 and ≤ 80 mL/min (mild renal impairment); ≥ 30 and ≤ 50 mL/min (moderate renal impairment); < 30 mL/min (severe renal impairment). Mild RI (CLcr > 50 and ≤ 80 mL/min) Same as patients with normal renal function. Moderate RI (CLcr ≥ 30 and ≤ 50 mL/min) Induction: 11 mg once daily for atleast 8 weeks; evaluate patients and transition to maintenance therapy depending on therapeutic response. If needed continue 11 mg once daily for a maximum of 16 weeks. Discontinue 11 mg once daily after 16 weeks if adequate therapeutic response is not achieved. Maintenance: Tofacitinib extended release tablets is not recommended. See Maintenance Dosage for XELJANZ tablets for Moderate or Severe RI. For patients undergoing hemodialysis, administer the dose after the dialysis session on dialysis days. If a dose was taken before the dialysis procedure, supplemental doses are not recommended after dialysis. Severe RI (CLcr < 30 mL/min) Recommended Dosage in Patients with Hepatic Impairment (HI) Mild HI (Child-Pugh A) Same as patients with normal hepatic function Moderate HI (Child-Pugh B) Induction : 11 mg once daily for at least 8 weeks; evaluate patients and transition to maintenance therapy depending on therapeutic response. If needed continue 11 mg once daily for a maximum of 16 weeks. Discontinue 11 mg once daily after 16 weeks if adequate therapeutic response is not achieved. Maintenance : Tofacitinib extended release tablets is not recommended. See Maintenance Dosage for XELJANZ tablets for Moderate HI. Severe HI (Child-Pugh C) Use of tofacitinib extended release tablets is not recommended. Table 4: Dosage Modifications of Tofacitinib Extended-Release Tablets Due to Drug Interactions and for Lymphopenia, Neutropenia or Anemia in Adults with Ulcerative Colitis Adults Tofacitinib Extended Release Tablets Dosage Modifications with Concomitant Use of CYP3A4 and/or CYP2C19 Inhibitor(s) Strong CYP2C19 inhibitor(s) No dosage modification is recommended. Moderate CYP2C19 inhibitor(s) Moderate CYP3A4 inhibitor(s) Moderate CYP3A4 inhibitor(s) with strong CYP2C19 inhibitor(s) (e.g., fluconazole) Induction : 11 mg once daily for at least 8 weeks; evaluate patients and transition to maintenance therapy depending on therapeutic response. If needed continue 11 mg once daily for a maximum of 16 weeks. Discontinue 11 mg once daily after 16 weeks if adequate therapeutic response is not achieved. Maintenance : Tofacitinib extended-release tablets is not recommended. see Maintenance Dosage for XELJANZ tablets for Strong CYP3A4 inhibitors. Strong CYP3A4 inhibitor(s) Dosage Modifications for Lymphopenia, Neutropenia, or Anemia Lymphocyte count less than 500 cells/mm 3 , confirmed by repeat testing Discontinue dosing. ANC less than 500 cells/mm 3 Discontinue dosing. ANC 500 to 1,000 cells/mm 3 If taking: 22 mg once daily, reduce to 11 mg once daily. When ANC is greater than 1,000, increase to 22 mg once daily based on clinical response. 11 mg once daily, interrupt dosing. When ANC is greater than 1,000, resume 11 mg once daily. Hemoglobin less than 8 g/dL or a decrease of more than 2 g/dL Interrupt dosing until hemoglobin values have normalized. Switching from XELJANZ Tablets to Tofacitinib extended-release tablets Patients treated with XELJANZ tablets: 5 mg twice daily may be switched to tofacitinib extended-release tablets 11 mg once daily the day following the last dose of XELJANZ tablets 5 mg. 10 mg twice daily may be switched to tofacitinib extended-release tablets 22 mg once daily the day following the last dose of XELJANZ tablets 10 mg.

5 WARNINGS AND PRECAUTIONS Serious Infections: Avoid use of tofacitinib extended-release tablets during an active serious infection, including localized infections. ( 5.1 ) Gastrointestinal Perforations : Promptly evaluate patients at increased risk for gastrointestinal perforation who present with new onset abdominal symptoms. ( 5.6 ) Hypoglycemia in Patients with Diabetes : Consider increased monitoring of blood glucose; advise patients with diabetes to notify their healthcare provider if they develop signs or symptoms of hypoglycemia. ( 5.8 ) Laboratory Monitoring : Recommended due to potential changes in lymphocytes, neutrophils, hemoglobin, liver enzymes and lipids. ( 5.9 ) Vaccinations : Avoid use of live vaccines concurrently with tofacitinib extended-release tablets. ( 5.10 )

5.1 Serious Infections Serious and sometimes fatal infections may occur with tofacitinib extended-release tablets. Serious and sometimes fatal infections due to bacterial, mycobacterial, invasive fungal, viral, or other opportunistic pathogens have been reported in patients receiving XELJANZ. The most common serious infections reported with XELJANZ included pneumonia, urinary tract infection, cellulitis, herpes zoster, bronchitis, septic shock, diverticulitis, gastroenteritis, appendicitis, and sepsis. Among opportunistic infections, tuberculosis and other mycobacterial infections, cryptococcosis, histoplasmosis, esophageal candidiasis, pneumocystosis, multi−dermatomal herpes zoster, cytomegalovirus infections, BK virus infection, and listeriosis were reported with XELJANZ. Some patients have presented with disseminated rather than localized disease, and were often taking concomitant immunomodulating agents such as methotrexate or corticosteroids. In the UC population, treatment with XELJANZ tablets 10 mg twice daily was associated with greater risk of serious infections compared to 5 mg twice daily. Additionally, opportunistic herpes zoster infections (including meningoencephalitis, ophthalmologic, and disseminated cutaneous) were seen in patients who were treated with XELJANZ tablets 10 mg twice daily. Other serious infections that were not reported in clinical studies may also occur (e.g., coccidioidomycosis). Avoid use of tofacitinib extended-release tablets in patients with an active, serious infection, including localized infections. The risks and benefits of treatment should be considered prior to initiating tofacitinib extended-release tablets in patients: with chronic or recurrent infection who have been exposed to tuberculosis with a history of a serious or an opportunistic infection who have resided or traveled in areas of endemic tuberculosis or endemic mycoses; or with underlying conditions that may predispose them to infection. Closely monitor patients for the development of signs and symptoms of infection during and after treatment with tofacitinib extended-release tablets. Interrupt tofacitinib extended-release tablets if a patient develops a serious infection, an opportunistic infection, or sepsis. In patients who develop a new infection during treatment with tofacitinib extended-release tablets, promptly complete diagnostic testing appropriate for an immunocompromised patient; initiate appropriate antimicrobial therapy, and monitor the patients closely. Caution is also recommended in patients with a history of chronic lung disease, or in those who develop interstitial lung disease, as they may be more prone to infections. Risk of infection may be higher with increasing degrees of lymphopenia and consideration should be given to lymphocyte counts when assessing individual patient risk of infection. Discontinuation and monitoring criteria for lymphopenia are recommended [see Dosage and Administration (2.3 , 2.5) ]. Tuberculosis Evaluate and test patients for latent or active tuberculosis (TB) infection prior to and per applicable guidelines during administration of tofacitinib extended-release tablets. Consider anti-TB therapy prior to administration of tofacitinib extended-release tablets in patients with a past history of latent or active TB in whom an adequate course of treatment cannot be confirmed, and for patients with a negative test for latent TB but who have risk factors for TB infection. Consultation with a physician with expertise in the treatment of TB is recommended to aid in the decision about whether initiating anti-TB therapy is appropriate for an individual patient. Monitor patients closely for the development of signs and symptoms of TB, including patients who tested negative for latent TB infection prior to initiating therapy. Treat patients with latent TB with standard antimycobacterial therapy before administering tofacitinib extended-release tablets. Viral Reactivation Viral reactivation, including cases of herpes virus reactivation (e.g., herpes zoster), were observed in clinical studies with XELJANZ. Postmarketing cases of hepatitis B reactivation have been reported in patients treated with XELJANZ. The impact of tofacitinib extended-release tablets on chronic viral hepatitis reactivation is unknown. Patients who screened positive for hepatitis B or C were excluded from clinical trials. Perform screening for viral hepatitis in accordance with clinical guidelines before starting therapy with tofacitinib extended-release tablets. The risk of herpes zoster is increased in patients treated with tofacitinib extended-release tablets and appears to be higher in patients treated with XELJANZ in Japan and Korea.

5.2 Increased Risk of Mortality Increased risk of mortality may occur with tofacitinib extended-release tablets. Adult patients with rheumatoid arthritis (RA), 50 years of age and older, with at least one cardiovascular risk factor treated with XELJANZ tablets 5 mg or 10 mg twice a day had a higher observed rate of all-cause mortality, including sudden cardiovascular death, compared to those treated with TNF blockers in a large, randomized, postmarketing safety study (RA Safety Study 1). The incidence rate of all-cause mortality per 100 patient-years was 1.23 for XELJANZ tablets 10 mg twice a day, 0.88 for XELJANZ tablets 5 mg twice a day, and 0.69 for TNF blockers [see Clinical Studies (14.6) ] . Consider the benefits and risks for the individual patient prior to initiating or continuing therapy with tofacitinib extended-release tablets. XELJANZ 10 mg twice daily (or tofacitinib extended-release tablets 22 mg once daily) dosages are not recommended for the treatment of RA, PsA, or AS [see Dosage and Administration (2.3) ] . For the treatment of UC, use tofacitinib extended-release tablets at the lowest effective dose and for the shortest duration needed to achieve/maintain therapeutic response [see Dosage and Administration (2.5) ] .

5.3 Malignancy and Lymphoproliferative Disorders Malignancies and lymphoproliferative disorders may occur with tofacitinib extended-release tablets. Malignancies, including lymphomas and solid cancers, were observed in clinical studies of XELJANZ [see Adverse Reactions (6.1) ]. Other malignancies were observed in XELJANZ clinical studies and the postmarketing setting, including, but not limited to, lung cancer, breast cancer, melanoma, prostate cancer, and pancreatic cancer. In RA Safety Study 1, a higher rate of malignancies (excluding non-melanoma skin cancer (NMSC)) was observed in patients treated with XELJANZ tablets 5 mg or 10 mg twice a day compared with TNF blockers. The incidence rate of malignancies (excluding NMSC) per 100 patient-years was 1.13 for XELJANZ tablets 10 mg twice a day, 1.13 for XELJANZ tablets 5 mg twice a day, and 0.77 for TNF blockers. Patients who are current or past smokers are at additional increased risk [see Clinical Studies (14.6) ]. Lymphomas and lung cancers, which are a subset of all malignancies in RA Safety Study 1, were observed at a higher rate in patients treated with XELJANZ tablets 5 mg twice a day and XELJANZ tablets 10 mg twice a day compared to those treated with TNF blockers. The incidence rate of lymphomas per 100 patient-years was 0.11 for XELJANZ tablets 10 mg twice a day, 0.07 for XELJANZ tablets 5 mg twice a day, and 0.02 for TNF blockers. The incidence rate of lung cancers per 100 patient-years among current and past smokers was 0.59 for XELJANZ tablets 10 mg twice a day, 0.48 for XELJANZ tablets 5 mg twice a day, and 0.27 for TNF blockers [see Clinical Studies (14.6) ] . Consider the benefits and risks for the individual patient prior to initiating or continuing therapy with tofacitinib extended-release tablets, particularly in patients with a known malignancy (other than a successfully treated NMSC), patients who develop a malignancy while on treatment, and patients who are current or past smokers. XELJANZ 10 mg twice daily (or tofacitinib extended-release tablets 22 mg once daily) dosages are not recommended for the treatment of RA, PsA, or AS [see Dosage and Administration (2.3) ] . Non-Melanoma Skin Cancer Non-melanoma skin cancers (NMSCs) have been reported in patients treated with XELJANZ tablets. Periodic skin examination is recommended for patients who are at increased risk for skin cancer. In the UC population, treatment with XELJANZ tablets 10 mg twice daily was associated with greater risk of NMSC than treatment with placebo.

5.4 Major Adverse Cardiovascular Events Major adverse cardiovascular events may occur with tofacitinib extended-release tablets. In RA Safety Study 1, patients with RA who were 50 years of age and older with at least one cardiovascular risk factor and treated with XELJANZ tablets 5 mg or 10 mg twice daily had a higher rate of major adverse cardiovascular events (MACE) defined as cardiovascular death, non-fatal myocardial infarction (MI), and non-fatal stroke, compared to those treated with TNF blockers. The incidence rate of MACE per 100 patient-years was 1.11 for XELJANZ tablets 10 mg twice a day, 0.91 for XELJANZ tablets 5 mg twice a day, and 0.79 for TNF blockers. The incidence rate of fatal or non-fatal myocardial infarction per 100 patient-years was 0.39 for XELJANZ tablets 10 mg twice a day, 0.36 for XELJANZ tablets 5 mg twice a day, and 0.2 for TNF blockers [see Clinical Studies (14.6) ] . Patients who are current or past smokers are at additional increased risk. Consider the benefits and risks for the individual patient prior to initiating or continuing therapy with tofacitinib extended-release tablets, particularly in patients who are current or past smokers and patients with other cardiovascular risk factors. Inform patients about the symptoms of serious cardiovascular events and the steps to take if they occur. Discontinue tofacitinib extended-release tablets in patients that have experienced a MI or stroke. XELJANZ 10 mg twice daily (or tofacitinib extended-release tablets 22 mg once daily) dosages are not recommended for the treatment of RA, PsA, or AS [see Dosage and Administration (2.3) ] .

5.5 Thrombosis Thrombosis may occur with tofacitinib extended-release tablets. Thrombosis, including pulmonary embolism (PE), deep venous thrombosis (DVT), and arterial thrombosis, have occurred in patients treated with XELJANZ and other Janus kinase ( JAK) inhibitors used to treat inflammatory conditions. Many of these events were serious and some resulted in death [see Warnings and Precautions (5.2) ] . Patients with RA 50 years of age and older with at least one cardiovascular risk factor treated with XELJANZ tablets 5 mg or 10 mg twice daily compared to TNF blockers in RA Safety Study 1 had an observed increase in incidence of these thrombotic events. The incidence rate of DVT per 100 patient-years was 0.28 for XELJANZ tablets 10 mg twice a day, 0.22 for XELJANZ tablets 5 mg twice a day, and 0.16 for TNF blockers. The incidence rate of PE per 100 patient-years was 0.49 for XELJANZ tablets 10 mg twice a day, 0.18 for XELJANZ tablets 5 mg twice a day, and 0.05 for TNF blockers [see Clinical Studies (14.6) ] . XELJANZ 10 mg twice daily (or tofacitinib extended-release tablets 22 mg once daily) dosages are not recommended for the treatment of RA, PsA, or AS [see Dosage and Administration (2.3) ] . In a long-term extension study in patients with UC, five cases of pulmonary embolism were reported in patients taking XELJANZ 10 mg twice daily, including one death in a patient with advanced cancer. Promptly evaluate patients with symptoms of thrombosis and discontinue tofacitinib extended-release tablets in patients with symptoms of thrombosis. Avoid tofacitinib extended-release tablets in patients that may be at increased risk of thrombosis. For the treatment of UC, use tofacitinib extended-release tablets at the lowest effective dose and for the shortest duration needed to achieve/maintain therapeutic response [see Dosage and Administration (2.5) ] .

5.6 Gastrointestinal Perforations Gastrointestinal perforations may occur with tofacitinib extended-release tablets. Events of gastrointestinal perforation have been reported in clinical studies with XELJANZ tablets, although the role of JAK inhibition in these events is not known. In these studies, many patients with RA received background therapy with nonsteroidal anti-inflammatory drugs (NSAIDs). There was no discernable difference in frequency of gastrointestinal perforation between the placebo and the XELJANZ tablets treatment groups in clinical trials of patients with UC, and many of them were receiving background corticosteroids. Promptly evaluate patients treated with tofacitinib extended-release tablets who may be at increased risk for gastrointestinal perforation (e.g., patients with a history of diverticulitis or taking NSAIDs) and who present with new onset abdominal symptoms for early identification of gastrointestinal perforation [see Adverse Reactions (6.1) ].

5.7 Hypersensitivity Reactions Hypersensitivity reactions may occur with tofacitinib extended-release tablets. Reactions such as angioedema and urticaria that may reflect drug hypersensitivity have been observed in patients receiving tofacitinib extended-release tablets. Some events were serious. If a serious hypersensitivity reaction occurs, promptly discontinue tofacitinib extended-release tablets while evaluating the potential cause or causes of the reaction [see Adverse Reactions (6.2) ] .

5.8 Hypoglycemia in Patients with Diabetes Hypoglycemia, including severe hypoglycemia, has been reported following initiation of tofacitinib extended-release tablets and other JAK inhibitors in patients with diabetes. During treatment with tofacitinib extended-release tablets, consider increased monitoring of blood glucose as clinically indicated in patients with diabetes. Advise patients with diabetes to notify their healthcare provider if they develop signs or symptoms of hypoglycemia.

5.9 Laboratory Abnormalities Laboratory abnormalities may occur with tofacitinib extended-release tablets. Lymphocyte Abnormalities Treatment with XELJANZ tablets was associated with initial lymphocytosis at one month of XELJANZ tablets treatment followed by a gradual decrease in mean absolute lymphocyte counts below the baseline of approximately 10% during 12 months of therapy. Lymphocyte counts less than 500 cells/mm 3 in these patients were associated with an increased incidence of treated and serious infections. Monitor lymphocyte counts at baseline and every 3 months thereafter. Avoid initiation of tofacitinib extended-release tablets treatment in patients with a low lymphocyte count (i.e., less than 500 cells/mm 3 ). In patients who develop a confirmed absolute lymphocyte count less than 500 cells/mm 3 , treatment with tofacitinib extended-release tablets is not recommended. Neutropenia Treatment with XELJANZ tablets was associated with an increased incidence of neutropenia (less than 2,000 cells/mm 3 ) compared to treatment with placebo. Monitor neutrophil counts at baseline and after 4-8 weeks of treatment and every 3 months thereafter. Avoid initiation of tofacitinib extended-release tablets treatment in patients with a low neutrophil count (i.e., ANC less than 1,000 cells/mm 3 ). For patients who develop a persistent ANC of 500 to 1,000 cells/mm 3 , interrupt dosing until ANC is greater than or equal to 1,000 cells/mm 3 . In patients who develop an ANC less than 500 cells/mm 3 , treatment with tofacitinib extended-release tablets is not recommended. Anemia Monitor hemoglobin at baseline and after 4 to 8 weeks of treatment and every 3 months thereafter. Avoid initiation of tofacitinib extended-release tablets treatment in patients with a low hemoglobin level (i.e., less than 9 g/dL). Interrupt treatment with tofacitinib extended-release tablets in patients who develop hemoglobin levels less than 8 g/dL or whose hemoglobin level drops greater than 2 g/dL on treatment until hemoglobin values have normalized. Liver Enzyme Elevations Treatment with XELJANZ tablets was associated with an increased incidence of liver enzyme elevation compared to treatment with placebo. Most of these abnormalities occurred in studies with background DMARD therapy (primarily methotrexate). Routine monitoring of liver tests and prompt investigation of the causes of liver enzyme elevations is recommended to identify potential cases of drug-induced liver injury. If drug-induced liver injury is suspected, interrupt the administration of tofacitinib extended-release tablets until this diagnosis has been excluded. Lipid Elevations Treatment with XELJANZ tablets was associated with dose-dependent increases in lipid parameters including total cholesterol, low-density lipoprotein (LDL) cholesterol, and high-density lipoprotein (HDL) cholesterol. Maximum changes in these lipid parameters were generally observed within 6 weeks. There were no clinically relevant changes in LDL/HDL cholesterol ratios. The effect of these lipid parameter elevations on cardiovascular morbidity and mortality has not been determined. Perform assessment of lipid parameters approximately 4 to 8 weeks following initiation of tofacitinib extended-release tablets therapy. Manage patients according to clinical guidelines [e.g., National Cholesterol Educational Program (NCEP)] for the management of hyperlipidemia.

5.10 Vaccinations Avoid use of live vaccines concurrently with tofacitinib extended-release tablets. Prior to initiating tofacitinib extended-release tablets therapy, update immunizations in agreement with current immunization guidelines. The interval between live vaccinations and initiation of tofacitinib extended-release tablets therapy should be in accordance with current vaccination guidelines regarding immunosuppressive agents.

5.11 Risk of Gastrointestinal Obstruction with Tofacitinib Extended-Release Tablets - A Non-Deformable Extended-Release Formulation Gastrointestinal obstruction may occur with tofacitinib extended-release tablets. Avoid use of tofacitinib extended-release tablets in patients with pre-existing severe gastrointestinal narrowing (pathologic or iatrogenic). There have been rare reports of obstructive symptoms in patients with known strictures in association with the ingestion of other drugs utilizing a non-deformable extended-release formulation.

The following clinically significant adverse reactions are described elsewhere in the labeling: Serious Infections [see Warnings and Precautions (5.1) ] Increased Risk of Mortality [see Warnings and Precautions (5.2) ] Malignancy and Lymphoproliferative Disorders [see Warnings and Precautions (5.3) ] Major Adverse Cardiovascular Events [see Warnings and Precautions (5.4) ] Thrombosis [see Warnings and Precautions (5.5) ] Gastrointestinal Perforations [see Warnings and Precautions (5.6) ] Hypersensitivity Reactions [see Warnings and Precautions (5.7) ] Hypoglycemia in Patients with Diabetes [see Warnings and Precautions (5.8) ] Laboratory Abnormalities [see Warnings and Precautions (5.9) ] Most common adverse reactions are: RA, PsA, and AS : Reported in ≥ 2% of adult patients treated with XELJANZ tablets monotherapy or in combination with DMARDs: upper respiratory tract infection (URI), nasopharyngitis, diarrhea, and headache. ( 6.1 ) UC : Reported in ≥ 5% of adult patients treated with either XELJANZ tablets and ≥1% greater than reported in patients treated with placebo: nasopharyngitis, elevated cholesterol levels, headache, URI, increased blood creatine phosphokinase, rash, diarrhea, and herpes zoster. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact ScieGen Pharmaceuticals, Inc. at (1-855-724-3436) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

6.1 Clinical Trials Experience Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not predict the rates observed in a broader patient population in clinical practice. The clinical studies described in this subsection were conducted using XELJANZ tablets (referred to as “XELJANZ” in this subsection of labeling). Adverse Reactions in Adults with Rheumatoid Arthritis In RA Safety Study 1, 1,455 adults were treated with XELJANZ 5 mg twice daily, 1,456 adults were treated with 10 mg twice daily, and 1,451 adults were treated with a TNF blocker for a median of 4 years [see Clinical Studies (14.6) ] . A dosage of XELJANZ 10 mg twice daily is not recommended for the treatment of RA because of increased risks [ see Dosage and Administration (2.3) and Warnings and Precautions (5) ]. For the treatment of adults with moderately to severely active RA [see Indications and Usage (1.1) ] , the recommended dosage of XELJANZ is 5 mg twice daily and the recommended dosage for tofacitinib extended-release tablets is 11 mg once daily. The safety of XELJANZ was also evaluated in two Phase 2 and five Phase 3 double-blind, placebo-controlled, multicenter trials in patients with RA. In these trials, adults were randomized to receive: XELJANZ (monotherapy) 5 mg twice daily (292 patients) or 10 mg twice daily (306 patients), In combination with DMARDs (including methotrexate), XELJANZ 5 mg twice daily (1,044 patients) or 10 mg twice daily (1,043 patients and Placebo (809 patients). All seven trials included provisions for patients taking placebo to receive treatment with XELJANZ at Month 3 or Month 6 either by patient response (based on uncontrolled disease activity) or by design, so that adverse events cannot always be unambiguously attributed to a given treatment. Therefore, some analyses that follow include patients who changed treatment by design or by patient response from placebo to XELJANZ in both the placebo and XELJANZ group of a given interval. Comparisons between placebo and XELJANZ groups were based on the first 3 months of exposure, and comparisons between XELJANZ 5 mg twice daily and XELJANZ 10 mg twice daily were based on the first 12 months of exposure. The long-term safety population includes all adults with RA who participated in a double-blind, placebo-controlled trial (including earlier development phase studies) and then participated in one of two long-term safety studies. The design of the long-term safety studies allowed for modification of XELJANZ doses according to clinical judgment. This limits the interpretation of the long-term safety data with respect to dose. The most common serious adverse reactions were serious infections [see Warnings and Precautions (5.1) ] . The proportion of patients who discontinued treatment due to any adverse reaction during the 0 to 3 months exposure in the double-blind, placebo-controlled trials was 4% for XELJANZ-treated patients and 3% for placebo-treated patients. Overall Infections In the seven placebo-controlled trials in patients with RA, during the 0 to 3 months exposure, the overall frequency of infections was 20% and 22% in the XELJANZ 5 mg twice daily and XELJANZ 10 mg twice daily groups, respectively, and 18% in the placebo group. The most commonly reported infections with XELJANZ were upper respiratory tract infections, nasopharyngitis, and urinary tract infections (4%, 3%, and 2% of patients, respectively). Serious Infections : In the seven placebo-controlled trials in patients with RA, during the 0 to 3 months exposure, serious infections were reported in 1 patient (0.5 events per 100 patient-years) who received placebo and 11 patients (1.7 events per 100 patient-years) who received XELJANZ 5 mg or 10 mg twice daily. The rate difference between treatment groups (and the corresponding 95% confidence interval) was 1.1 (-0.4, 2.5) events per 100 patient-years for the combined XELJANZ 5 mg twice daily and 10 mg twice daily group minus placebo. In the seven placebo-controlled trials, during the 0 to 12 months exposure, serious infections were reported in 34 patients (2.7 events per 100 patient-years) who received XELJANZ 5 mg twice daily and 33 patients (2.7 events per 100 patient-years) who received XELJANZ 10 mg twice daily. The rate difference between XELJANZ doses (and the corresponding 95% confidence interval) was -0.1 (-1.3, 1.2) events per 100 patient-years for XELJANZ 10 mg twice daily minus XELJANZ 5 mg twice daily. The most common serious infections included pneumonia, cellulitis, herpes zoster, and urinary tract infection [ see Warnings and Precautions (5.1) ] . Tuberculosis : In the seven placebo-controlled trials in patients with RA, during the 0 to 3 months exposure, tuberculosis (TB) was not reported in patients who received placebo, XELJANZ 5 mg twice daily, or XELJANZ 10 mg twice daily. In the seven placebo-controlled trials, during the 0 to 12 months exposure, TB was reported in 0 patients who received XELJANZ 5 mg twice daily and 6 patients (0.5 events per 100 patient-years) who received XELJANZ 10 mg twice daily. The rate difference between XELJANZ doses (and the corresponding 95% confidence interval) was 0.5 (0.1, 0.9) events per 100 patient-years for XELJANZ 10 mg twice daily minus XELJANZ 5 mg twice daily. Cases of disseminated TB were also reported. The median XELJANZ exposure prior to diagnosis of TB was 10 months (range from 152 to 960 days) [see Warnings and Precautions (5.1) ]. Opportunistic Infections (excluding tuberculosis ): In the seven placebo-controlled trials in patients with RA, during the 0 to 3 months exposure, opportunistic infections were not reported in patients who received placebo, XELJANZ 5 mg twice daily, or XELJANZ 10 mg twice daily. In the seven placebo-controlled trials, during the 0 to 12 months exposure, opportunistic infections were reported in 4 patients (0.3 events per 100 patient-years) who received XELJANZ 5 mg twice daily and 4 patients (0.3 events per 100 patient-years) who received XELJANZ 10 mg twice daily. The rate difference between XELJANZ doses (and the corresponding 95% confidence interval) was 0 (-0.5, 0.5) events per 100 patient-years for XELJANZ 10 mg twice daily minus XELJANZ 5 mg twice daily. The median XELJANZ exposure prior to diagnosis of an opportunistic infection was 8 months (range from 41 to 698 days) [see Warnings and Precautions (5.1) ]. Malignancies In the seven placebo-controlled trials in patients with RA, during the 0 to 3 months exposure, malignancies excluding NMSC were reported in 0 patients who received placebo and 2 patients (0.3 events per 100 patient-years) who received either XELJANZ 5 mg or 10 mg twice daily. The rate difference between treatment groups (and the corresponding 95% confidence interval) was 0.3 (-0.1, 0.7) events per 100 patient-years for the combined XELJANZ 5 mg and 10 mg twice daily group minus placebo. In the seven placebo-controlled trials, during the 0 to 12 months exposure, malignancies excluding NMSC were reported in 5 patients (0.4 events per 100 patient-years) who received XELJANZ 5 mg twice daily and 7 patients (0.6 events per 100 patient-years) who received XELJANZ 10 mg twice daily. The rate difference between XELJANZ doses (and the corresponding 95% confidence interval) was 0.2 (-0.4, 0.7) events per 100 patient-years for XELJANZ 10 mg twice daily minus XELJANZ 5 mg twice daily. One of these malignancies was a case of lymphoma that occurred during the 0-to-12-month period in a patient treated with XELJANZ 10 mg twice daily. The most common types of malignancy, including malignancies observed during the long-term extension in XELJANZ-treated patients, were lung and breast cancer, followed by gastric, colorectal, renal cell, prostate cancer, lymphoma, and malignant melanoma [ see Warnings and Precautions (5.3) ]. Laboratory Abnormalities Lymphopenia : In the placebo-controlled clinical trials in patients with RA, confirmed decreases in absolute lymphocyte counts below 500 cells/mm 3 occurred in 0.04% of patients for the XELJANZ 5 mg twice daily and 10 mg twice daily groups combined during the first 3 months of exposure. Confirmed lymphocyte counts less than 500 cells/mm 3 were associated with an increased incidence of treated and serious infections [see Warnings and Precautions (5.9) ]. Neutropenia : In the placebo-controlled clinical trials in patients with RA, confirmed decreases in ANC below 1,000 cells/mm 3 occurred in 0.07% of patients for the XELJANZ 5 mg twice daily and 10 mg twice daily groups combined during the first 3 months of exposure. There were no confirmed decreases in ANC below 500 cells/mm 3 observed in any treatment group. There was no clear relationship between neutropenia and the occurrence of serious infections. In the long-term safety population, the pattern and incidence of confirmed decreases in ANC remained consistent with what was seen in the placebo-controlled clinical trials [see Warnings and Precautions (5.9) ]. Liver Enzyme Elevations : Confirmed increases in liver enzymes greater than 3 times the upper limit of normal (3x ULN) were observed in patients with RA treated with XELJANZ. In patients experiencing liver enzyme elevation, modification of treatment regimen, such as reduction in the dose of concomitant DMARD, interruption of XELJANZ, or reduction in XELJANZ dosage, resulted in decrease or normalization of liver enzymes. In the placebo-controlled monotherapy trials (0 to 3 months), no differences in the incidence of ALT or AST elevations were observed between the placebo, and XELJANZ 5 mg, and 10 mg twice daily groups. In the placebo-controlled background DMARD trials (0 to 3 months), ALT elevations greater than 3x ULN were observed in 1.0%, 1.3% and 1.2% of patients who received placebo, XELJANZ 5 mg, and 10 mg twice daily, respectively. In these trials, AST elevations greater than 3x ULN were observed in 0.6%, 0.5% and 0.4% of patients who received placebo, XELJANZ 5 mg, and 10 mg twice daily, respectively. One case of drug-induced liver injury was reported in a patient treated with XELJANZ 10 mg twice daily for approximately 2.5 months. The patient developed symptomatic elevations of AST and ALT greater than 3x ULN and bilirubin elevations greater than 2x ULN, which required hospitalizations and a liver biopsy. Lipid Elevations : In the placebo-controlled clinical trials in patients with RA, dose-related elevations in lipid parameters (total cholesterol, LDL cholesterol, HDL cholesterol, triglycerides) were observed at one month of exposure and remained stable thereafter. Changes in lipid parameters during the first 3 months of exposure in the placebo-controlled clinical trials are summarized below: Mean LDL cholesterol increased by 15% in the XELJANZ 5 mg twice daily arm and 19% in the XELJANZ 10 mg twice daily arm. Mean HDL cholesterol increased by 10% in the XELJANZ 5 mg twice daily arm and 12% in the XELJANZ 10 mg twice daily arm. Mean LDL/HDL ratios were essentially unchanged in XELJANZ-treated patients. In a placebo-controlled clinical trial, elevations in LDL cholesterol and ApoB decreased to pretreatment levels in response to statin therapy. In the long-term safety population, elevations in lipid parameters remained consistent with what was seen in the placebo-controlled clinical trials. Serum Creatinine Elevations : In the placebo-controlled clinical trials in patients with RA, dose-related elevations in serum creatinine were observed with XELJANZ treatment. The mean increase in serum creatinine was < 0.1 mg/dL in the 12-month pooled safety analysis; however, with increasing duration of exposure in the long-term extensions, up to 2% of patients were discontinued from XELJANZ treatment due to the protocol-specified discontinuation criterion of an increase in creatinine by more than 50% of baseline. The clinical significance of the observed serum creatinine elevations is unknown. Common Adverse Reactions Table 5 displays adverse reactions that occurred in 2% or more of patients on XELJANZ 5 mg or 10 mg twice daily and at least 1% greater than in XELJANZ-treated patients that observed in placebo-treated patients with or without DMARD in the RA trials. Table 5: Common Adverse Reactions reported in ≥2% of patients treated with either dose of XELJANZ and ≥1% greater than that reported for placebo. in Clinical Trials of XELJANZ for the Treatment of Rheumatoid Arthritis in Adults With or Without Concomitant DMARDs (0 to 3 Months) Preferred Term Placebo XELJANZ 5 mg Twice Daily XELJANZ 10 mg Twice Daily The recommended dose of XELJANZ for the treatment of RA is 5 mg twice daily [see Dosage and Administration (2) ]. N = 809 (%) N = 1336 (%) N = 1349 (%) N reflects randomized and treated patients from the seven placebo-controlled clinical trials. Upper respiratory tract infection 3 4 4 Nasopharyngitis 3 4 3 Diarrhea 2 4 3 Headache 2 4 3 Hypertension 1 2 2 Other adverse reactions that occurred in placebo-controlled and open-label extension studies in patients with RA included: Blood and lymphatic system disorders: Anemia Infections and infestations: Diverticulitis Metabolism and nutrition disorders: Dehydration Psychiatric disorders: Insomnia Nervous system disorders: Paresthesia Respiratory, thoracic and mediastinal disorders: Dyspnea, cough, sinus congestion, interstitial lung disease (cases were limited to patients with RA and some were fatal) Gastrointestinal disorders: Abdominal pain, dyspepsia, vomiting, gastritis, nausea Hepatobiliary disorders : Hepatic steatosis Skin and subcutaneous tissue disorders: Rash, erythema, pruritus Musculoskeletal, connective tissue and bone disorders: Musculoskeletal pain, arthralgia, tendonitis, joint swelling Neoplasms benign, malignant and unspecified (including cysts and polyps): Non-melanoma skin cancers General disorders and administration site conditions : Pyrexia, fatigue, peripheral edema Clinical Experience in Methotrexate-Naïve Patients Study RA-VI was an active-controlled clinical trial in methotrexate-naïve patients [ see Clinical Studies (14) ]. The safety experience in these patients was consistent with Studies RA-I through V. Adverse Reactions in Adults with Psoriatic Arthritis The safety of XELJANZ was evaluated in 2 double-blind Phase 3 clinical trials in adults with active psoriatic arthritis (PsA): Study PsA-I (NCT01877668) had a duration of 12 months and enrolled adults who had an inadequate response to a nonbiologic DMARD and who were naïve to treatment with a TNF blocker. Study PsA-I included a 3-month placebo-controlled period and also included adalimumab 40 mg subcutaneously once every 2 weeks for 12 months. Study PsA-II (NCT01882439) had a duration of 6 months and enrolled adults who had an inadequate response to at least one approved TNF blocker. This clinical trial included a 3-month placebo-controlled period. In these combined Phase 3 clinical trials, 238 patients were randomized and treated with XELJANZ 5 mg twice daily and 236 patients were randomized and treated with XELJANZ 10 mg twice daily. A dosage of XELJANZ 10 mg twice daily is not recommended for the treatment of PsA. For the treatment of adults with active PsA [see Indications and Usage (1.2) ] , the recommended dosage of XELJANZ is 5 mg twice daily and the recommended dosage for tofacitinib extended-release tablets is 11 mg once daily [ see Dosage and Administration (2.3) ]. All patients in the clinical trials in patients with PsA were required to receive treatment with a stable dose of a nonbiologic DMARD [the majority (79%) received methotrexate]. The study population randomized and treated with XELJANZ (474 patients) included 45 (10%) patients aged 65 years or older and 66 (14%) patients with diabetes at baseline. During the 2 PsA controlled clinical trials, there were: 3 malignancies (excluding NMSC) in 474 patients who received XELJANZ plus non-biologic DMARD (6 to 12 months exposure) 0 malignancies in 236 patients who received placebo plus non-biologic DMARD group (3 months exposure) and 0 malignancies in 106 patients in patients who received adalimumab plus non-biologic DMARD group (12 months exposure). No lymphomas were reported. Malignancies have also been observed in the long-term extension study in patients with PsA treated with XELJANZ. The safety profile observed in adults with active PsA treated with XELJANZ was consistent with the safety profile observed in adults with RA. Adverse Reactions in Adults with Ankylosing Spondylitis The safety of XELJANZ was evaluated in adults with active ankylosing spondylitis (AS) in a double-blind placebo-controlled Phase 3 clinical trial (Study AS-I) and in a dose-ranging Phase 2 clinical trial (Study AS-II). Study AS-I (NCT03502616) had a duration of 48 weeks and enrolled adults who had an inadequate response to at least 2 NSAIDs. Study AS-I included a 16-week double-blind period in which patients received XELJANZ 5 mg or placebo twice daily and a 32-week open-label treatment period in which all patients received XELJANZ 5 mg twice daily. Study AS-II (NCT01786668) had a duration of 16 weeks and enrolled adults who had an inadequate response to at least 2 NSAIDs. This clinical trial included a 12-week treatment period in which patients received either XELJANZ 2 mg (40% of the recommended dose), 5 mg, 10 mg, or placebo twice daily. A dosage of XELJANZ 10 mg twice daily is not recommended for the treatment of AS . For the treatment of adults with active AS [see Indications and Usage (1.3 )], the recommended dosage of XELJANZ is 5 mg twice daily and the recommended dosage for tofacitinib extended-release tablets is 11 mg once daily [see Dosage and Administration (2.3) ]. In the combined Phase 2 and Phase 3 clinical trials, a total of 420 patients were treated with either XELJANZ 2 mg, 5 mg, or 10 mg twice daily. Of these, 316 patients were treated with XELJANZ 5 mg twice daily for up to 48 weeks. In the combined double-blind period, 185 patients were randomized to and treated with XELJANZ 5 mg twice daily and 187 to placebo for up to 16 weeks. Concomitant treatment with stable doses of nonbiologic DMARDs, NSAIDs, or corticosteroids (≤ 10 mg/day) was permitted. The study population randomized and treated with XELJANZ included 13 (3%) patients aged 65 years or older and 18 (4%) patients with diabetes at baseline. The safety profile observed in adults with AS treated with XELJANZ was consistent with the safety profile observed in adults with RA and PsA. Adverse Reactions in Adults with Ulcerative Colitis The safety of XELJANZ has been evaluated in adults with moderately to severely active UC in 4 randomized, double-blind, placebo-controlled trials (UC-I, UC-II, UC-III, and dose-ranging UC-V) and an open-label long-term extension study (UC-IV) [see Clinical Studies (14.5) ] . Adverse reactions reported in ≥ 5% of patients treated with either XELJANZ 5 mg or 10 mg twice daily and ≥ 1% greater than reported in patients receiving placebo in either the induction or maintenance clinical trials of patients with UC were: nasopharyngitis, elevated cholesterol levels, headache, upper respiratory tract infection, increased blood creatine phosphokinase, rash, diarrhea, and herpes zoster. Induction Trials in Adults with UC Common adverse reactions reported in ≥ 2% of patients treated with XELJANZ 10 mg twice daily and ≥ 1% greater in XELJANZ-treated patients than placebo-treated patients in the 3 induction trials of patients with UC (Studies UC-I, UC-II, and UC-V) were: headache, nasopharyngitis, elevated cholesterol levels, acne, increased blood creatine phosphokinase, and pyrexia. Maintenance Trial in Adults with UC Common adverse reactions reported in ≥ 4% of patients treated with either dosage of XELJANZ and ≥ 1% greater than reported in patients treated with placebo in the maintenance trial of patients with UC (Study UC-III) are shown in Table 6. Table 6: Common Adverse Reactions Reported in ≥4% of patients treated with either XELJANZ dosage and ≥1% greater in XELJANZ-treated patients than placebo-treated patients. in Adults with UC During the 52-Week Maintenance Trial (Study UC-III) Preferred Term Placebo XELJANZ 5 mg Twice Daily XELJANZ 10 mg Twice Daily N = 198 (%) N = 198 (%) N = 196 (%) Nasopharyngitis 6 10 14 Elevated cholesterol levels Includes hypercholesterolemia, hyperlipidemia, blood cholesterol increased, dyslipidemia, blood triglycerides increased, low-density lipoprotein increased, low-density lipoprotein abnormal, or lipids increased. 1 5 9 Headache 6 9 3 Upper respiratory tract infection 4 7 6 Increased blood creatine phosphokinase 2 3 7 Rash 4 3 6 Diarrhea 3 2 5 Herpes zoster 1 1 5 Gastroenteritis 3 3 4 Anemia 2 4 2 Nausea 3 1 4 Dose-dependent adverse reactions seen in patients treated with XELJANZ 10 mg twice daily, in comparison to 5 mg twice daily, include the following: herpes zoster infections, serious infections, and NMSC [see Warnings and Precautions (5.1 , 5.3) ]. During the UC controlled clinical studies (8-week induction and 52-week maintenance studies), which included 1,220 patients, 0 cases of solid cancer or lymphoma were observed in XELJANZ-treated patients. In the long-term extension study, malignancies (including solid cancers, lymphomas and NMSC) were observed in patients treated with XELJANZ 5 mg and 10 mg twice daily [see Warnings and Precautions (5.3) ]. Five cases of pulmonary embolism were reported in patients taking XELJANZ 10 mg twice daily, including one fatality in a patient with advanced cancer [ see Warnings and Precautions (5.5) ].

6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of tofacitinib extended-release tablets. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Immune system disorders : Drug hypersensitivity (events such as angioedema and urticaria havebeen observed) Metabolism and nutrition disorders: Hypoglycemia Skin and subcutaneous tissue disorders : Acne

Lactation : Advise not to breastfeed. ( 8.2 )

8.1 Pregnancy Risk Summary The available data with tofacitinib extended-release tablets from a pregnancy exposure registry that enrolled exposed pregnant females, pharmacovigilance, and published literature are insufficient to draw conclusions about a drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes. There are risks to the mother and the fetus associated with RA and UC in pregnancy (see Clinical Considerations ). In animal reproduction studies, fetocidal and teratogenic effects were noted when pregnant rats and rabbits received tofacitinib during the period of organogenesis at exposures multiples of 73-times and 6.3-times the maximum recommended dose of 10 mg twice daily, respectively. Further, in a peri- and post-natal study in rats, tofacitinib resulted in reductions in live litter size, postnatal survival, and pup body weights at exposure multiples of approximately 73-times the recommended dosage of 5 mg twice daily and approximately 36 times the maximum recommended dosage of 10 mg twice daily, respectively (see Data ) . The background risks of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. The background risks in the U.S. general population of major birth defects and miscarriages are 2 to 4% and 15 to 20% of clinically recognized pregnancies, respectively. Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk: Published data suggest that increased disease activity is associated with the risk of developing adverse pregnancy outcomes in women with RA or UC. Adverse pregnancy outcomes include preterm delivery (before 37 weeks of gestation), low birth weight (less than 2,500 grams) infants, and small for gestational age at birth. Data Animal Data : In a rat embryofetal developmental study, in which pregnant rats received tofacitinib during organogenesis, tofacitinib was teratogenic at exposure levels approximately 146 times the recommended dose of 5 mg twice daily, and approximately 73 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 100 mg/kg/day in rats). Teratogenic effects consisted of external and soft tissue malformations of anasarca and membranous ventricular septal defects, respectively; and skeletal malformations or variations (absent cervical arch; bent femur, fibula, humerus, radius, scapula, tibia, and ulna; sternoschisis; absent rib; misshapen femur; branched rib; fused rib; fused sternebra; and hemicentric thoracic centrum). In addition, there was an increase in post-implantation loss, consisting of early and late resorptions, resulting in a reduced number of viable fetuses. Mean fetal body weight was reduced. No developmental toxicity was observed in rats at exposure levels approximately 58 times the recommended dose of 5 mg twice daily, and approximately 29 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 30 mg/kg/day in pregnant rats). In a rabbit embryofetal developmental study in which pregnant rabbits received tofacitinib during the period of organogenesis, tofacitinib was teratogenic at exposure levels approximately 13 times the recommended dose of 5 mg twice daily, and approximately 6.3 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 30 mg/kg/day in rabbits) in the absence of signs of maternal toxicity. Teratogenic effects included thoracogastroschisis, omphalocele, membranous ventricular septal defects, and cranial/skeletal malformations (microstomia, microphthalmia), mid-line and tail defects. In addition, there was an increase in post-implantation loss associated with late resorptions. No developmental toxicity was observed in rabbits at exposure levels approximately 3 times the recommended dose of 5 mg twice daily, and approximately 1.5 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 10 mg/kg/day in pregnant rabbits). In a peri- and postnatal development study in pregnant rats that received tofacitinib from gestation day 6 through day 20 of lactation, there were reductions in live litter size, postnatal survival, and pup body weights at exposure levels approximately 73 times the recommended dose of 5 mg twice daily, and approximately 36 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 50 mg/kg/day in rats). There was no effect on behavioral and learning assessments, sexual maturation or the ability of the F1 generation rats to mate and produce viable F2 generation fetuses in rats at exposure levels approximately 17 times the recommended dose of 5 mg twice daily, and approximately 8.3 times the maximum recommended dose of 10 mg twice daily (on an AUC basis at oral doses of 10 mg/kg/day in rats).

8.2 Lactation Risk Summary Based on published data, tofacitinib is present in human milk. Data on the effects of tofacitinib on the breastfed infant is limited to a small number of cases with no reported adverse effects. There are no data on the effects on milk production. Given the serious adverse reactions seen in patients treated with tofacitinib extended-release tablets, such as increased risk of serious infections, advise patients that breastfeeding is not recommended during treatment and for at least 36 hours after the last dose of tofacitinib extended-release tablets (approximately 6 elimination half-lives). Data Following administration of tofacitinib to lactating rats, concentrations of tofacitinib in milk over time paralleled those in serum and were approximately 2 times higher in milk relative to maternal serum at all time points measured.

8.3 Females and Males of Reproductive Potential Contraception Females In an animal reproduction study, tofacitinib at AUC multiples of 13 times the recommended dosage of 5 mg twice daily and 6.3 times the maximum recommended dosage of 10 mg twice daily demonstrated adverse embryo-fetal findings [see Use in Specific Populations (8.1) ] . However, there is uncertainty as to how these animal findings relate to females of reproductive potential treated with the recommended clinical dosage. Consider pregnancy planning and prevention for females of reproductive potential. Infertility Females Based on findings in rats, treatment with tofacitinib extended-release tablets may result in reduced fertility in females of reproductive potential. It is not known if this effect is reversible [see Nonclinical Toxicology (13.1) ] .

8.4 Pediatric Use The safety and effectiveness of tofacitinib extended-release tablets in pediatric patients have not been established.

8.5 Geriatric Use Of the 3,315 adults who were enrolled in clinical trials with RA (Studies RA-I to V), a total of 505 patients were 65 years of age and older, including 71 patients 75 years and older. The frequency of serious infection among XELJANZ tablets-treated patients 65 years of age and older was higher than among those adults under the age of 65. Of the 1,156 XELJANZ tablet-treated patients in clinical trials of patients with UC, a total of 77 patients (7%) were 65 years of age or older. Clinical studies of XELJANZ in patients with UC did not include sufficient numbers of patients aged 65 years and older to determine whether they respond differently from younger adult patients. Of the 783 XELJANZ tablet-treated patients in clinical trials of patients with PsA, a total of 72 (9.2%) patients were 65 years of age and older, including 2 (0.3%) patients 75 years and older. These clinical studies did not include sufficient numbers of patients aged 65 years and older with PsA to determine if they respond differently from younger adult patients. Of the 420 XELJANZ tablet-treated patients in clinical trials of patients with AS, a total of 12 (2.9%) patients were 65 years of age and older, including 1 (0.2%) patient 75 years and older. These clinical studies did not include sufficient numbers of patients aged 65 years and older with AS to determine if they respond differently from younger adult patients.

8.6 Renal Impairment Moderate and Severe Renal Impairment XELJANZ-treated patients with moderate renal impairment (RI) (CLcr ≥ 30 and ≤ 50 mL/minute) or severe RI (< 30 mL/minute) had greater tofacitinib blood concentrations than XELJANZ-treated patients with normal renal function (CLcr > 80 mL/minute). The recommended dosage of tofacitinib extended-release tablets in patients with moderate or severe RI (including those with severe RI who are undergoing hemodialysis) is lower than the recommended dosage in patients with normal renal function [see Dosage and Administration (2.3 , 2.5) ] . Mild Renal Impairment The recommended dosage in patients with mild RI (CLcr > 50 and ≤ 80 mL/minute) is the same as patients with normal renal function.

8.7 Hepatic Impairment Severe Hepatic Impairment Tofacitinib extended-release tablets has not been studied in patients with severe hepatic impairment (HI) (Child-Pugh C); therefore, use of tofacitinib extended-release tablets in patients with severe HI is not recommended. Moderate Hepatic Impairment XELJANZ-treated patients with moderate hepatic impairment (Child-Pugh B) had greater tofacitinib blood concentration than XELJANZ-treated patients with normal hepatic function [see Clinical Pharmacology (12.3) ]. Higher blood concentrations may increase the risk of some adverse reactions. The recommended tofacitinib extended-release tablets dosage in patients with moderate HI is lower than the recommended dosage in patients with normal hepatic function [see Dosage and Administration (2.3 , 2.5) ] . Mild Hepatic Impairment The recommended dosage of tofacitinib extended-release tablets in patients with mild hepatic impairment (Child-Pugh A) is the same as patients with normal hepatic function. Hepatitis B or C Serology The safety and efficacy of tofacitinib extended-release tablets have not been studied in patients with positive hepatitis B virus or hepatitis C virus serology.

12.1 Mechanism of Action Tofacitinib is a Janus kinase (JAK) inhibitor. JAKs are intracellular enzymes which transmit signals arising from cytokine or growth factor-receptor interactions on the cellular membrane to influence cellular processes of hematopoiesis and immune cell function. Within the signaling pathway, JAKs phosphorylate and activate Signal Transducers and Activators of Transcription (STATs) which modulate intracellular activity including gene expression. Tofacitinib modulates the signaling pathway at the point of JAKs, preventing the phosphorylation and activation of STATs. JAK enzymes transmit cytokine signaling through pairing of JAKs (e.g., JAK1/JAK3, JAK1/JAK2, JAK1/TyK2, JAK2/JAK2). Tofacitinib inhibited the in vitro activities of JAK1/JAK2, JAK1/JAK3, and JAK2/JAK2 combinations with IC 50 of 406, 56, and 1377 nM, respectively. However, the relevance of specific JAK combinations to therapeutic effectiveness is not known.

12.2 Pharmacodynamics Treatment with XELJANZ was associated with dose-dependent reductions of circulating CD16/56+ natural killer cells, with estimated maximum reductions occurring at approximately 8-10 weeks after initiation of therapy. These changes generally resolved within 2 to 6 weeks after discontinuation of treatment. Treatment with XELJANZ was associated with dose-dependent increases in B cell counts. Changes in circulating T-lymphocyte counts and T-lymphocyte subsets (CD3+, CD4+ and CD8+) were small and inconsistent. The clinical significance of these changes is unknown. Total serum IgG, IgM, and IgA levels after 6-month dosing in patients with rheumatoid arthritis (RA) were lower than in patients who received placebo; however, changes were small and not dose-dependent. After treatment with XELJANZ in patients with RA, rapid decreases in serum C-reactive protein (CRP) were observed and maintained throughout dosing. Changes in CRP observed with XELJANZ treatment do not reverse fully within 2 weeks after discontinuation, indicating a longer duration of pharmacodynamic activity compared to the pharmacokinetic half-life. Similar changes in T cells, B cells, and serum CRP have been observed in patients with active psoriatic arthritis (PsA) although reversibility was not assessed. Total serum immunoglobulins were not assessed in patients with active PsA.

12.3 Pharmacokinetics Following oral administration of tofacitinib extended-release tablets, peak plasma concentrations were reached at 4 hours and half-life was about 6 to 8 hours. Steady state concentrations were achieved within 48 hours with negligible accumulation after once daily administration. Table 8 describes the pharmacokinetic parameters of tofacitinib extended-release tablets. Table 8 Pharmacokinetic Parameters of Tofacitinib Extended-Release Tablets Following Multiple Oral Dosing PK Parameters Values represent the geometric mean, except T max , for which is the median (range) is shown. (CV%) Tofacitinib extended-release tablets Dosing Regimen 11 mg Once Daily 22 mg Once Daily Abbreviations: AUC 24 = area under the concentration time profile from time 0 to 24 hours; C max = maximum plasma concentration; C min = minimum plasma concentration; T max = time to C max ; CV = Coefficient of variation. AUC 24 (ng.hr/mL) 269.0 (18) 596.6 (19) C max (ng/mL) 38.2 (15) 83.8 (25) C min (ng/mL) 1.07 (69) 3.11 (43) T max (hours) 4.0 (3.0 to 4.0) 4.0 (2.0 to 4.0) Absorption XELJANZ The absolute oral bioavailability of XELJANZ is 74%. Coadministration of XELJANZ with a high-fat meal resulted in no changes in AUC while C max was reduced by 32%. In clinical trials, XELJANZ was administered without regard to meals [see Dosage and Administration (2.2) ]. Tofacitinib Extended-Release Tablets Coadministration of tofacitinib extended-release tablets 11 and 22 mg with a high-fat meal resulted in no changes in AUC while C max was increased by 27% and 19% respectively. T max was extended by approximately 1 hour for both tofacitinib extended-release tablets 11 and 22 mg. Distribution After intravenous administration, the volume of distribution was 87 L. The protein binding of tofacitinib is approximately 40%. Tofacitinib binds predominantly to albumin and does not appear to bind to α1-acid glycoprotein. Tofacitinib distributes equally between red blood cells and plasma. Metabolism and Excretion Clearance mechanisms for tofacitinib are approximately 70% hepatic metabolism and 30% renal excretion of the parent drug. The metabolism of tofacitinib is primarily mediated by CYP3A4 with minor contribution from CYP2C19. In a human radiolabeled study, more than 65% of the total circulating radioactivity was accounted for by unchanged tofacitinib, with the remaining 35% attributed to 8 metabolites, each accounting for less than 8% of total radioactivity. The pharmacologic activity of tofacitinib is attributed to the parent molecule. Pharmacokinetics in Patients with RA, PsA, AS, and UC Population pharmacokinetic (PK) analyses indicated that PK characteristics were similar between patients with RA, PsA, ankylosing spondylitis, and UC. The coefficient of variation (%) in AUC of tofacitinib were generally similar across different disease patients, ranging from 22% to 34% (Table 9). Table 9: Tofacitinib Exposure in Patients with RA, PsA, AS, and UC After Administration of XELJANZ 5 mg Twice Daily or 10 mg Twice Daily Pharmacokinetic Parameters Pharmacokinetic parameters estimated based on population pharmacokinetic analysis. Geometric Mean (CV%) XELJANZ 5 mg Twice Daily XELJANZ 10 mg Twice Daily Rheumatoid Arthritis Psoriatic Arthritis Ankylosing Spondylitis Ulcerative Colitis Ulcerative Colitis Abbreviations: AUC 0-24,ss = area under the plasma concentration-time curve over 24 hours at steady state; CV = coefficient of variation. AUC 0-24,ss (ng·h/mL) 504 (22.0%) 419 (34.1%) 381 (25.4%) 423 (22.6%) 807 (24.6%) Specific Populations Covariate evaluation as part of population PK analyses in adult patient populations indicated no clinically relevant change in tofacitinib exposure, after accounting for differences in renal function (i.e., creatinine clearance) between patients, based on age, weight, biological sex and race (Figure 1). An approximately linear relationship between body weight and volume of distribution was observed, resulting in higher peak (C max ) and lower trough (C min ) concentrations in lighter patients. However, this difference is not considered to be clinically relevant. The effect of renal and hepatic impairment and other intrinsic factors on the PK of tofacitinib is shown in Figure 1. Figure 1: Impact of Intrinsic Factors on Tofacitinib Pharmacokinetics Note: Reference values for weight, age, biological sex, and race comparisons are 70 kg, 55 years, male, and white, respectively; reference groups for renal and hepatic impairment data are patients with normal renal and hepatic function. Renal function was estimated using creatinine clearance by Cockcroft-Gault method and hepatic function was estimated using Child-Pugh scoring method. In patients with end-stage renal disease maintained on hemodialysis, mean AUC was approximately 40% higher compared with historical healthy subject data, consistent with approximately 30% contribution of renal clearance to the total clearance of tofacitinib [see Dosage and Administration (2.3 , 2.5) and Use in Specific Populations (8.6) ] . Drug Interaction Studies Potential for Tofacitinib Extended-Release Tablets to Influence the PK of Other Drugs In vitro studies indicate that tofacitinib does not significantly inhibit or induce the activity of the major human drug-metabolizing CYPs (CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, and CYP3A4) at concentrations corresponding to the steady state C max of a 10 mg twice daily dose. These in vitro results were confirmed by a human drug interaction study showing no changes in the pharmacokinetics of midazolam, a highly sensitive CYP3A4 substrate, when concomitantly administered with XELJANZ. In vitro studies indicate that tofacitinib does not significantly inhibit the activity of the major human drug-metabolizing uridine 5'-diphospho-glucuronosyltransferases (UGTs) [UGT1A1, UGT1A4, UGT1A6, UGT1A9, and UGT2B7] at concentrations exceeding 250 times the steady state C max of a 10 mg twice daily dose. In patients with RA, the oral clearance of tofacitinib does not vary with time, indicating that tofacitinib does not normalize CYP enzyme activity in patients with RA. Therefore, concomitant use with tofacitinib extended-release tablets is not expected to result in clinically relevant increases in the metabolism of CYP substrates in patients with RA. In vitro data indicate that the potential for tofacitinib to inhibit transporters such as P-glycoprotein, organic anionic or cationic transporters at therapeutic concentrations is low. The impact of tofacitinib on the PK of other drugs for the concomitant drugs are shown in Figure 2. Figure 2: Impact of Tofacitinib on the Pharmacokinetics of Other Drugs Note: Reference group is administration of concomitant medication alone; OCT = Organic Cationic Transporter; MATE = Multidrug and Toxic Compound Extrusion Potential for Other Drugs to Influence the Pharmacokinetics of Tofacitinib Since tofacitinib is metabolized by CYP3A4, interaction with drugs that inhibit or induce CYP3A4 is likely. Inhibitors of CYP2C19 alone or P-glycoprotein are unlikely to substantially alter the pharmacokinetics of tofacitinib (see Figure 3). Figure 3: Impact of Other Drugs on the Pharmacokinetics of Tofacitinib Note: Reference group is administration of XELJANZ alone. Figure 1 Figure 2 Figure 3

Following oral administration of tofacitinib extended-release tablets, peak plasma concentrations were reached at 4 hours and half-life was about 6 to 8 hours. Steady state concentrations were achieved within 48 hours with negligible accumulation after once daily administration. Table 8 describes the pharmacokinetic parameters of tofacitinib extended-release tablets. Table 8 Pharmacokinetic Parameters of Tofacitinib Extended-Release Tablets Following Multiple Oral Dosing PK Parameters Values represent the geometric mean, except T max , for which is the median (range) is shown. (CV%) Tofacitinib extended-release tablets Dosing Regimen 11 mg Once Daily 22 mg Once Daily Abbreviations: AUC 24 = area under the concentration time profile from time 0 to 24 hours; C max = maximum plasma concentration; C min = minimum plasma concentration; T max = time to C max ; CV = Coefficient of variation. AUC 24 (ng.hr/mL) 269.0 (18) 596.6 (19) C max (ng/mL) 38.2 (15) 83.8 (25) C min (ng/mL) 1.07 (69) 3.11 (43) T max (hours) 4.0 (3.0 to 4.0) 4.0 (2.0 to 4.0) Absorption XELJANZ The absolute oral bioavailability of XELJANZ is 74%. Coadministration of XELJANZ with a high-fat meal resulted in no changes in AUC while C max was reduced by 32%. In clinical trials, XELJANZ was administered without regard to meals [see Dosage and Administration (2.2) ]. Tofacitinib Extended-Release Tablets Coadministration of tofacitinib extended-release tablets 11 and 22 mg with a high-fat meal resulted in no changes in AUC while C max was increased by 27% and 19% respectively. T max was extended by approximately 1 hour for both tofacitinib extended-release tablets 11 and 22 mg. Distribution After intravenous administration, the volume of distribution was 87 L. The protein binding of tofacitinib is approximately 40%. Tofacitinib binds predominantly to albumin and does not appear to bind to α1-acid glycoprotein. Tofacitinib distributes equally between red blood cells and plasma. Metabolism and Excretion Clearance mechanisms for tofacitinib are approximately 70% hepatic metabolism and 30% renal excretion of the parent drug. The metabolism of tofacitinib is primarily mediated by CYP3A4 with minor contribution from CYP2C19. In a human radiolabeled study, more than 65% of the total circulating radioactivity was accounted for by unchanged tofacitinib, with the remaining 35% attributed to 8 metabolites, each accounting for less than 8% of total radioactivity. The pharmacologic activity of tofacitinib is attributed to the parent molecule. Pharmacokinetics in Patients with RA, PsA, AS, and UC Population pharmacokinetic (PK) analyses indicated that PK characteristics were similar between patients with RA, PsA, ankylosing spondylitis, and UC. The coefficient of variation (%) in AUC of tofacitinib were generally similar across different disease patients, ranging from 22% to 34% (Table 9). Table 9: Tofacitinib Exposure in Patients with RA, PsA, AS, and UC After Administration of XELJANZ 5 mg Twice Daily or 10 mg Twice Daily Pharmacokinetic Parameters Pharmacokinetic parameters estimated based on population pharmacokinetic analysis. Geometric Mean (CV%) XELJANZ 5 mg Twice Daily XELJANZ 10 mg Twice Daily Rheumatoid Arthritis Psoriatic Arthritis Ankylosing Spondylitis Ulcerative Colitis Ulcerative Colitis Abbreviations: AUC 0-24,ss = area under the plasma concentration-time curve over 24 hours at steady state; CV = coefficient of variation. AUC 0-24,ss (ng·h/mL) 504 (22.0%) 419 (34.1%) 381 (25.4%) 423 (22.6%) 807 (24.6%) Specific Populations Covariate evaluation as part of population PK analyses in adult patient populations indicated no clinically relevant change in tofacitinib exposure, after accounting for differences in renal function (i.e., creatinine clearance) between patients, based on age, weight, biological sex and race (Figure 1). An approximately linear relationship between body weight and volume of distribution was observed, resulting in higher peak (C max ) and lower trough (C min ) concentrations in lighter patients. However, this difference is not considered to be clinically relevant. The effect of renal and hepatic impairment and other intrinsic factors on the PK of tofacitinib is shown in Figure 1. Figure 1: Impact of Intrinsic Factors on Tofacitinib Pharmacokinetics Note: Reference values for weight, age, biological sex, and race comparisons are 70 kg, 55 years, male, and white, respectively; reference groups for renal and hepatic impairment data are patients with normal renal and hepatic function. Renal function was estimated using creatinine clearance by Cockcroft-Gault method and hepatic function was estimated using Child-Pugh scoring method. In patients with end-stage renal disease maintained on hemodialysis, mean AUC was approximately 40% higher compared with historical healthy subject data, consistent with approximately 30% contribution of renal clearance to the total clearance of tofacitinib [see Dosage and Administration (2.3 , 2.5) and Use in Specific Populations (8.6) ] . Drug Interaction Studies Potential for Tofacitinib Extended-Release Tablets to Influence the PK of Other Drugs In vitro studies indicate that tofacitinib does not significantly inhibit or induce the activity of the major human drug-metabolizing CYPs (CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, and CYP3A4) at concentrations corresponding to the steady state C max of a 10 mg twice daily dose. These in vitro results were confirmed by a human drug interaction study showing no changes in the pharmacokinetics of midazolam, a highly sensitive CYP3A4 substrate, when concomitantly administered with XELJANZ. In vitro studies indicate that tofacitinib does not significantly inhibit the activity of the major human drug-metabolizing uridine 5'-diphospho-glucuronosyltransferases (UGTs) [UGT1A1, UGT1A4, UGT1A6, UGT1A9, and UGT2B7] at concentrations exceeding 250 times the steady state C max of a 10 mg twice daily dose. In patients with RA, the oral clearance of tofacitinib does not vary with time, indicating that tofacitinib does not normalize CYP enzyme activity in patients with RA. Therefore, concomitant use with tofacitinib extended-release tablets is not expected to result in clinically relevant increases in the metabolism of CYP substrates in patients with RA. In vitro data indicate that the potential for tofacitinib to inhibit transporters such as P-glycoprotein, organic anionic or cationic transporters at therapeutic concentrations is low. The impact of tofacitinib on the PK of other drugs for the concomitant drugs are shown in Figure 2. Figure 2: Impact of Tofacitinib on the Pharmacokinetics of Other Drugs Note: Reference group is administration of concomitant medication alone; OCT = Organic Cationic Transporter; MATE = Multidrug and Toxic Compound Extrusion Potential for Other Drugs to Influence the Pharmacokinetics of Tofacitinib Since tofacitinib is metabolized by CYP3A4, interaction with drugs that inhibit or induce CYP3A4 is likely. Inhibitors of CYP2C19 alone or P-glycoprotein are unlikely to substantially alter the pharmacokinetics of tofacitinib (see Figure 3). Figure 3: Impact of Other Drugs on the Pharmacokinetics of Tofacitinib Note: Reference group is administration of XELJANZ alone. Figure 1 Figure 2 Figure 3