Tafamidis Meglumine

1. INDICATIONS AND USAGE VYNDAQEL and VYNDAMAX are indicated for the treatment of the cardiomyopathy of wild-type or hereditary transthyretin-mediated amyloidosis (ATTR-CM) in adults to reduce cardiovascular mortality and cardiovascular-related hospitalization. VYNDAQEL and VYNDAMAX are transthyretin stabilizers indicated for the treatment of the cardiomyopathy of wild-type or hereditary transthyretin-mediated amyloidosis in adults to reduce cardiovascular mortality and cardiovascular-related hospitalization. ( 1 )

2. DOSAGE AND ADMINISTRATION The recommended dosage is either:

• VYNDAQEL 80 mg orally once daily, or
• VYNDAMAX 61 mg orally once daily ( 2.1 )
• VYNDAMAX and VYNDAQEL are not substitutable on a per mg basis. ( 2.1 )

2.1 Recommended Dosage The recommended dosage is either VYNDAQEL 80 mg (four 20-mg tafamidis meglumine capsules) orally once daily or VYNDAMAX 61 mg (one 61-mg tafamidis capsule) orally once daily. VYNDAMAX and VYNDAQEL are not substitutable on a per mg basis [see Clinical Pharmacology (12.3) ] .

2.2 Administration Instructions The capsules should be swallowed whole and not crushed or cut. If a dose is missed, instruct patients to take the dose as soon as remembered or to skip the missed dose and take the next dose at the regularly scheduled time. Do not double the dose.

3. DOSAGE FORMS AND STRENGTHS VYNDAQEL is available as:

• tafamidis meglumine 20 mg: yellow, opaque, oblong capsule, printed with "VYN 20" in red. VYNDAMAX is available as:
• tafamidis 61 mg: reddish brown, opaque, oblong capsule, printed with "VYN 61" in white. Capsules: Tafamidis meglumine 20 mg and tafamidis 61 mg. ( 3 )

4. CONTRAINDICATIONS None. None. ( 4 )

7. DRUG INTERACTIONS 7.1 BCRP Substrates Tafamidis inhibits breast cancer resistant protein (BCRP) in humans [see Clinical Pharmacology (12.3) ] . Coadministration of tafamidis and drugs that are BCRP substrates may increase the exposure of substrates of this transporter (e.g., methotrexate, rosuvastatin, imatinib) and the risk of the substrate-related toxicities. Monitor for signs of BCRP substrate-related toxicities and modify dosage of the substrate if appropriate.

6. ADVERSE REACTIONS To report SUSPECTED ADVERSE REACTIONS, contact Pfizer Inc. at 1-800-438-1985 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The data reflect exposure of 377 ATTR-CM patients to 20 mg or 80 mg (administered as four 20-mg capsules) of VYNDAQEL administered daily for an average of 24.5 months (ranging from 1 day to 111 months). Adverse events were assessed from ATTR-CM clinical trials with VYNDAQEL, primarily a 30-month placebo-controlled trial [see Clinical Studies (14) ] . The frequency of adverse events in patients treated with VYNDAQEL 20 mg (n=88) or 80 mg (n=176; administered as four 20-mg capsules) was similar to that with placebo (n=177). In the 30-month placebo-controlled trial, similar proportions of VYNDAQEL-treated patients and placebo-treated patients discontinued the study drug because of an adverse event: 12 (7%), 5 (6%), and 11 (6%) from the VYNDAQEL 80-mg, VYNDAQEL 20-mg, and placebo groups, respectively.

10. OVERDOSAGE There is minimal clinical experience with overdose. During clinical trials, two patients accidentally ingested a single VYNDAQEL dose of 160 mg without adverse events. The highest dose of tafamidis meglumine given to healthy volunteers in a clinical trial was 480 mg as a single dose. There was one reported adverse event of mild hordeolum at this dose.

Risk Summary Based on findings from animal studies, VYNDAQEL and VYNDAMAX may cause fetal harm when administered to a pregnant woman. However, limited available human data with VYNDAQEL use in pregnant women (at a dose of 20 mg per day) have not identified any drug-associated risks for major birth defects, miscarriage, or adverse maternal or fetal outcomes. In animal reproductive studies, oral administration of tafamidis meglumine to pregnant rabbits during organogenesis resulted in adverse effects on development (embryofetal mortality, fetal body weight reduction and fetal malformation) at a dosage providing approximately 9 times the human exposure (AUC) at the maximum recommended human dose (MRHD) of VYNDAQEL (80 mg), and increased incidence of fetal skeletal variation at a dosage providing equivalent human exposure (AUC) at the MRHD. Postnatal mortality, growth retardation, and impaired learning and memory were observed in offspring of pregnant rats administered tafamidis meglumine during gestation and lactation at a dosage approximately 2 times the MRHD based on body surface area (mg/m 2 ) (see Data ) . Advise pregnant women of the potential risk to a fetus. Report pregnancies to the Pfizer reporting line at 1-800-438-1985. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defects, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Animal Data In pregnant rats, oral administration of tafamidis meglumine (0, 15, 30, and 45 mg/kg/day) throughout organogenesis resulted in decreased fetal body weights at ≥30 mg/kg/day (approximately 10 times the human exposure at the MRHD based on AUC). The no-observed-adverse-effect-level (NOAEL) for embryofetal development in rats was 15 mg/kg/day (approximately 7 times the human exposure at the MRHD based on AUC). In pregnant rabbits, oral administration of tafamidis meglumine (0, 0.5, 2, and 8 mg/kg/day) throughout organogenesis resulted in increased embryofetal mortality, reduced fetal body weights, and an increased incidence of fetal malformations at 8 mg/kg/day (approximately 9 times the human exposure at the MRHD based on AUC), which was also maternally toxic. Increased incidences of fetal skeletal variations were observed at doses ≥0.5 mg/kg/day (approximately equivalent to the human exposure at the MRHD based on AUC). In the pre- and postnatal study, pregnant rats received oral administration of tafamidis meglumine at doses of 0, 5, 15, or 30 mg/kg/day throughout pregnancy and lactation (Gestation Day 7 to Lactation Day 20). Decreased survival and body weights, delayed male sexual maturation and neurobehavioral effects (learning and memory impairment) were observed in the offspring of dams treated at 15 mg/kg/day (approximately 2 times the MRHD on a mg/m 2 basis). The NOAEL for pre- and postnatal development in rats was 5 mg/kg/day (approximately equivalent to the MRHD on a mg/m 2 basis).

The safety and effectiveness of VYNDAQEL and VYNDAMAX have not been established in pediatric patients.

No dosage adjustment is required for elderly patients (≥65 years) [see Clinical Pharmacology (12.3) ] . Of the total number of patients in the clinical study (n=441), 90.5% were 65 and over, with a median age of 75 years.

11. DESCRIPTION VYNDAQEL (tafamidis meglumine) and VYNDAMAX (tafamidis) contain tafamidis as the active moiety, which is a selective stabilizer of transthyretin. The chemical name of tafamidis meglumine is 2-(3,5-dichlorophenyl)-1,3-benzoxazole-6-carboxylic acid mono (1-deoxy-1-methylamino-D-glucitol). The molecular formula is C 14 H 7 Cl 2 NO 3 C 7 H 17 NO 5 , and the molecular weight is 503.33 g/mol. The structural formula is: Tafamidis meglumine 20-mg soft gelatin capsule for oral use contains a white to pink colored suspension of tafamidis meglumine 20 mg (equivalent to 12.2 mg of tafamidis free acid), and the following inactive ingredients: ammonium hydroxide 28%, brilliant blue FCF, carmine, gelatin, glycerin, iron oxide (yellow), polyethylene glycol 400, polysorbate 80, polyvinyl acetate phthalate, propylene glycol, sorbitan monooleate, sorbitol, and titanium dioxide. The chemical name of tafamidis is 2-(3,5-dichlorophenyl)-1,3-benzoxazole-6-carboxylic acid. The molecular formula is C 14 H 7 Cl 2 NO 3 , and the molecular weight is 308.12 g/mol. The structural formula is: Tafamidis 61-mg soft gelatin capsule for oral use contains a white to pink colored suspension of tafamidis 61 mg and the following inactive ingredients: ammonium hydroxide 28%, butylated hydroxytoluene, gelatin, glycerin, iron oxide (red), polyethylene glycol 400, polysorbate 20, povidone (K-value 90), polyvinyl acetate phthalate, propylene glycol, sorbitol, and titanium dioxide. Chemical Structure Chemical Structure

Tafamidis is a selective stabilizer of TTR. Tafamidis binds to TTR at the thyroxine binding sites, stabilizing the tetramer and slowing dissociation into monomers, the rate-limiting step in the amyloidogenic process.

A proprietary TTR stabilization assay was utilized as a pharmacodynamic marker and assessed the stability of the TTR tetramer ex vivo. The TTR stabilization assay quantifies immunoturbidimetric measurement of the stable TTR tetramer in plasma pre- and post-treatment with 2-day in vitro denaturation with urea. Using this proprietary assay, a dose-dependent trend for greater TTR tetramer stabilization is observed for VYNDAQEL 80-mg compared to VYNDAQEL 20-mg. However, the clinical relevance of a higher TTR tetramer stabilization towards cardiovascular outcomes is not known. VYNDAQEL stabilized both the wild-type TTR tetramer and the tetramers of 14 TTR variants tested clinically after once-daily dosing. Tafamidis also stabilized the TTR tetramer for 25 variants tested ex vivo. VYNDAQEL and VYNDAMAX may decrease serum concentrations of total thyroxine, without an accompanying change in thyroid stimulating hormone (TSH). This reduction in total thyroxine values is probably the result of reduced thyroxine binding to or displacement from transthyretin (TTR) due to the high binding affinity of tafamidis to the TTR thyroxine receptor. No corresponding clinical findings consistent with hypothyroidism have been observed. Biomarkers associated with heart failure (NT-proBNP and Troponin I) favored VYNDAQEL over placebo. Cardiac Electrophysiology At approximately 2.2 times the steady state peak plasma concentration (C max ) at the recommended dose, tafamidis does not prolong the QTc interval to any clinically relevant extent.

No clinically significant differences in steady state C max and area under the plasma concentration over time curve (AUC) of tafamidis were observed for VYNDAMAX 61-mg capsule compared to VYNDAQEL administered as four 20-mg capsules. Tafamidis exposure increases proportionally over single (up to 480 mg) or multiple (up to 80 mg) (1 to 6 times the approved recommended dosage) once daily dosing. The apparent clearance were similar after single and repeated administration of VYNDAQEL 80 mg. Absorption Median tafamidis peak concentrations occurred within 4 hours following dosing. Effect of Food No clinically significant differences in the pharmacokinetics of tafamidis were observed following administration of a high fat, high calorie meal. Distribution The apparent steady state volume of distribution of tafamidis meglumine is 16 liters and 18.5 liters for tafamidis. Plasma protein binding of tafamidis is >99% in vitro. Tafamidis primarily binds to TTR. Elimination The mean half-life of tafamidis is approximately 49 hours. The apparent oral clearance of tafamidis meglumine is 0.228 L/h (0.263 L/h for tafamidis). The degree of drug accumulation at steady state after repeated tafamidis daily dosing is approximately 2.5-fold greater than that observed after a single dose. Metabolism The metabolism of tafamidis has not been fully characterized. However, glucuronidation has been observed. Excretion After a single oral dose of tafamidis meglumine 20 mg, approximately 59% of the dose was recovered in feces (mostly as the unchanged drug) and approximately 22% of the dose was recovered in urine (mostly as the glucuronide metabolite). Specific Populations No clinically significant differences in the pharmacokinetics of tafamidis were observed based on age, race/ethnicity (Caucasian and Japanese) or renal impairment. Patients with Hepatic Impairment Patients with moderate hepatic impairment (Child-Pugh Score of 7 to 9) had decreased systemic exposure (approximately 40%) and increased clearance (approximately 68%) of tafamidis compared to healthy subjects. As TTR levels are lower in subjects with moderate hepatic impairment than in healthy subjects, the exposure of tafamidis relative to the amount of TTR is sufficient to maintain stabilization of the TTR tetramer in these patients. No clinically significant differences in the pharmacokinetics of tafamidis were observed in patients with mild hepatic impairment (Child Pugh Score of 5 to 6) compared to healthy subjects. The effect of severe hepatic impairment on tafamidis is unknown. Drug Interaction Studies Clinical Studies CYP3A4 substrates: No clinically significant differences in the pharmacokinetics of midazolam (a CYP3A4 substrate) or on the formation of its active metabolite (1-hydroxymidazolam) were observed when a single 7.5-mg dose of midazolam was administered prior to and after a 14-day regimen of VYNDAQEL 20-mg once daily. BCRP substrates: Tafamidis inhibits breast cancer resistant protein (BCRP). In a clinical study in healthy participants, AUC inf and C max of the BCRP substrate rosuvastatin increased by 96.75% and 85.59%, respectively following multiple doses of VYNDAMAX 61 mg daily dosing. In Vitro Studies Cytochrome P450 Enzymes : Tafamidis induces CYP2B6 and CYP3A4 and does not induce CYP1A2. Tafamidis does not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP3A4/5 or CYP2D6. UDP glucuronosyltransferase (UGT) : Tafamidis inhibits intestinal activities of UGT1A1 but neither induces nor inhibits other UDP glucuronosyltransferase (UGT) systemically. Transporter Systems : In vitro studies and model predictions show that tafamidis has a low potential to inhibit organic anion transporters OAT1 and OAT3 at clinically relevant concentrations. Tafamidis did not show a potential to inhibit Multi-Drug Resistant Protein (MDR1) (also known as P-glycoprotein; P-gp), organic cation transporter OCT2, multidrug and toxin extrusion transporters MATE1 and MATE2K and, organic anion transporting polypeptide OATP1B1 and OATP1B3.

, Mutagenesis, Impairment of Fertility Carcinogenesis There was no evidence of an increased incidence of neoplasia in the transgenic (Tg)-rasH2 mouse following repeated daily administration for 26 weeks at daily doses of 0, 10, 30 or 90 mg/kg. There was no evidence of increased incidence of neoplasia in a 2-year carcinogenicity study in rats at exposures up to 18 times the AUC at the MRHD. Mutagenesis There was no evidence of mutagenicity or clastogenicity in vitro, and an in vivo rat micronucleus study was negative. Impairment of Fertility There were no effects of tafamidis meglumine on fertility, reproductive performance, or mating behavior in the rat at any dose. Rats were dosed daily (0, 5, 15, and 30 mg/kg/day) prior to cohabitation (for at least 15 days for females and 28 days for males), throughout the cohabitation period to the day prior to termination of males and through to implantation of females (Gestation Day 7). No adverse effects were noted on male and female rats in toxicity, fertility, and mating behavior at any dose. The paternal and maternal no observed adverse effect level for reproductive toxicity of tafamidis meglumine is 30 mg/kg/day, approximately 4 times the MRHD on a mg/m 2 basis.

17. PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Patient Information). Pregnancy Report pregnancies to the Pfizer reporting line at 1-800-438-1985. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Advise females to inform their healthcare provider of a known or suspected pregnancy [see Use in Specific Populations (8.1) ]. Lactation Advise females not to breastfeed during treatment with VYNDAQEL or VYNDAMAX [see Use in Specific Populations (8.2) ] . This product's label may have been updated. For full prescribing information, please visit www.pfizer.com . For medical information about VYNDAQEL or VYNDAMAX, please visit www.pfizermedinfo.com or call 1‑800‑438‑1985.

Store VYNDAQEL and VYNDAMAX at controlled room temperature 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature] .