Premier Brands Anti-Fungal Nail Solution Pen

Undecylenic Acid Liquid by

Drug Labeling and Warnings

Undecylenic Acid Liquid by is a Otc medication manufactured, distributed, or labeled by Premier Brands of America Inc.. Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

UNDECYLENIC ACID LIQUID- antifungal pen liquid 
Premier Brands of America Inc.


Premier Brands Anti-Fungal Nail Solution Pen

​Active ingredient

Undecylenic acid 25%w/w




For the cure of most tinea pedis (athlete's foot) and tinea corporis (ringworm).

For relief of:

  • itching
  • burning
  • redness
  • irritation
  • scaling
  • discomfort which may accompany these conditions
  • soreness


For external use only.

  consult a healthcare professional before use.

Do not use

​on children 2 years of age unless directed by a doctor.

When using this product

avoid contact with eyes.

Use only as directed

​by a doctor on persons with highly sensitive skin.

Stop use and consult a doctor if

  • there is no improvement within 4 weeks
  • irritation occurs

Keep out of children.

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


​Read all warnings and directions. Use only as directed.

  • clean the affected area and dry thoroughly
  • twist and click pen untill product is dispensed onto the tip of the applicator. Initial use will require several clicks
  • apply a thin layer of the product over the affected area twice daily (morning and night) or as directed by a doctor
  • supervise children in the use of this product
  • for athlete's foot: pay special attention to spaces between the toes
  • wear well-fitting, ventilated shoes, and change shoes and socks at least once daily
  • for athlete's foot and ringworm, use daily for 4 weeks. If conditions persists longer, consult a doctor
  • this product is not effective on the scalp or nails

​Other information

  • store at room temperature 15°-30°C (59° - 86°F)
  • protect from freezing. If freezing occurs, warm to room temperature
  • keep tightly closed when not in use

​Inactive ingredient

isopropyl palmitate


Call 1-866-964-0939

Principal Display Panel


Maximum Strength


​Undecylenic Acid 25%

Eliminates fungus

on fingers, toes &

around nails

Pre-filled pen

with applicator


Convenient &

easy to use

Non-oily formula

dries quickly

NET CONTENTS 0.05 FL OZ (1.7 mL)

nail pen 1

nail pen 2

antifungal pen liquid
Product Information
Product TypeHUMAN OTC DRUGItem Code (Source)NDC: 56104-241
Route of AdministrationTOPICAL
Active Ingredient/Active Moiety
Ingredient NameBasis of StrengthStrength
Inactive Ingredients
Ingredient NameStrength
#Item CodePackage DescriptionMarketing Start DateMarketing End Date
1NDC: 56104-241-051.7 mL in 1 APPLICATOR; Type 0: Not a Combination Product01/15/202112/31/2021
Marketing Information
Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
OTC Monograph DrugM00501/01/202112/31/2021
Labeler - Premier Brands of America Inc. (117557458)

Revised: 2/2024