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Undecylenic Acid 25% Antifungal Pen

OTC Topical RxCUI 998329
Contents

Overview

Active ingredient
Undecylenic Acid
Route
Topical
Label date
2026-05-17

Indications and usage

Use Helps prevent fungal infections, including tinea pedis (toenail onychomycosis). Relieves itching, burning, and cracking. Cures athlete’s foot.

Purpose

Antifungal

Dosage and administration

Directions Prep: Wash the affected area with soap and water. Soak the nail to soften it. For toenail fungus: Gently file thickened areas of the nail every 2-3 days (avoid damaging nail bed). Apply a thin layer over the entire nail surface, under the nail edge, and around the cuticle. Use twice daily: morning and evening for at least 6 weeks. For best results, continue use for 3-6 months or as directed by a doctor. For athlete’s foot: Apply to affected areas and between toes. Allow product to dry fully before putting on socks or shoes.

Warnings

For external use only.

Do not use

If pregnant or breastfeeding, consult a healthcare professional before use. Do not use on children under 2 years of age unless directed by a doctor.

Ask a doctor before use if

if there is no improvement within 4 weeks or if irritation occurs.

When using this product

avoid contact with eyes. Use only as directed by a doctor on persons with highly sensitive skin.

Stop use and ask a doctor if

if there is no improvement within 4 weeks or if irritation occurs.

Active ingredient (label)

Undecylenic Acid 25%

Inactive ingredients

s Almond Oil, Tea Tree Oil, Mineral Oil, Peppermint Oil, Tocopherol (Vitamin E).

Storage and handling

Other information Store at room temperature 15°C-30°C (59°F-86°F). Close cap tightly after each use. Keep away from direct sunlight and excessive moisture.

Keep out of reach of children

Of Children If accidental ingestion occurs, get medical help or contact a Poison Control Center right away.