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ZYNTHIX

Dosage form
SOLUTION
Labeler
Shenzhen Siwei Yijiu Trading Co., Ltd.
Label updated
2026-04-08
Retrieved
2026-09-07
Active ingredients
UNDECYLENIC ACID
View original label and images on DailyMed ↗
Active ingredient

Undecylenic Acid 25%

Purpose

Antifungal

Uses
  • For the treatment of most athlete’s foot, jock itch, and ringworm.
  • Relieves itching, burning, cracking, and scaling.
Warnings
  • For external use only.
  • This product is not effective on the scalp.
  • Flammable. Keep away from fire or flame.

Do not use

  • On children under 2 years of age unless directed by a doctor.
  • For diaper rash.

When using this product

  • Avoid contact with eyes.
  • May cause mild stinging or burning sensation on broken skin.

Stop use and ask a doctor if

  • Irritation occurs or gets worse.
  • There is no improvement within 4 weeks (for athlete's foot and ringworm) or 2 weeks (for jock itch).
Pregnancy or breast feeding section

If pregnant or breast-feeding, ask a health professional before use.

Keep out of reach of children

If swallowed, get medical help or contact a Poison Control Center right away.

Directions
  • Clean the affected area and dry thoroughly.
  • Twist off the cap, rotate the bottom to dispense solution to the brush.
  • Apply a thin layer to the affected area twice daily (morning and night) or as directed by a doctor.
  • 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.
  • For jock itch, use daily for 2 weeks.
  • Supervise children in the use of this product.
Other information
  • Store at room temperature 15°-30°C (59°-86°F).
  • Protect from excessive heat and direct sunlight.
Inactive ingredients

Alcohol denat, Borneol, Glycerin, Isopropyl alcohol, Menthol, Water.

Questions?

213-396-1046 / [email protected]

Box Front Panel

ZYNTHIX
ANTIFUNGAL PEN

25% Undecylenic Acid
Maximum Strength

  • Helps Treat Fungal Infections
  • Relieves Itching & Burning
  • Supports Healthy Nails

NET:12ml/0.42fl.oz
(3x4mL)

[Image in the official label — see DailyMed source]

DailyMed Set ID: 4ef4a167-f673-efb4-e063-6294a90a3026 · Version 1
NDC: 87575-4041