Generic name: Butenafine.

Mentax is an antifungal. It works by blocking the synthesis of ergosterol, an essential component of fungal cell membranes. 

Quick Facts About Mentax


Used to treat fungus infections of the skin, including athlete’s foot, ringworm of the feet, and jock itch.

Mentax Dosage

Wash hands before and after each application. Apply a thin film of cream to affected area(s) after drying them thoroughly. Avoid contact with eyes, mouth, nose, and other mucous membranes. Use exactly as prescribed. Do not discontinue treatment, change dose, or use to treat any fungal infection for which Mentax was not prescribed by your doctor. Avoid use of bandage or dressing unless otherwise instructed by your doctor.

  • Usual adult dose: thin film over affected area(s) once per day for 4 weeks.
  • Usual child dose: not recommended for children under 12 years.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose; go back to regular schedule. Do not double doses.

Mentax Side Effects

Overdose symptoms:

if you accidentally ingest Mentax or suspect an overdose, immediately seek medical attention.

More common side effects: burning, irritation, itching, rash, stinging, swelling, worsening of infection.

No known less common or rare Mentax side effects.


Do not combine Mentax with any other medication applied to affected skin area(s).

No known food/other substance interactions. 

Special Cautions

Effects of Mentax on pregnant women and nursing mothers not known. If pregnant, planning to become pregnant, or breastfeeding, inform your doctor immediately.

No special precautions apply to seniors.

Not generally prescribed for children under 12 years.

  • Do not discontinue use before end of prescribed treatment even if symptoms disappear.
  • Inform your doctor if side effects are uncomfortable or severe. Doctor may prescribe another antifungal medication.
  • Athlete’s foot and other fungal infections may be caused by a variety of fungi. Do not use
  • Mentax for other infections or share medication with other people.
  • Condition should improve within 4 weeks. Contact your doctor if infection has not disappeared by end of treatment.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Mentax side effects, please contact your healthcare provider.