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|Trade names||Mentax, Lotrimin Ultra|
|Biological half-life||35–100 hours|
|Chemical and physical data|
|Molar mass||317.47 g/mol|
|3D model (Jmol)|
Butenafine hydrochloride is a synthetic benzylamine antifungal, marketed under the trade names Mentax, Butop (India) and is the active ingredient in Lotrimin Ultra. It is structurally related to synthetic allylamine antifungals such as terbinafine.
Butenafine is indicated for the topical treatment of tinea (pityriasis) versicolor due to Malassezia furfur, as well as athlete's foot (Tinea pedis), ringworm (Tinea corporis) and jock itch (Tinea cruris) due to Epidermophyton floccosum, Trichophyton mentagrophytes, Trichophyton rubrum, and Trichophyton tonsurans.
There is some evidence that it is effective against dermatophyte infections of the toenails, but needs to be applied daily for prolonged periods (at least one year).
Butenafine is typically available as a 1% topical cream.
Like the allylamine antifungals, butenafine works by inhibiting the synthesis of ergosterol by inhibiting squalene epoxidase, an enzyme responsible for the creation of sterols needed in fungal cell membranes. Lacking ergosterol, the cell membranes increase in permeability, allowing their contents to leak out.
For 1% cream:
- for adults and children 12 years and older:
- wash the affected skin with soap and water and dry completely before applying
- apply once a day to affected skin for 2 weeks or as directed by a doctor
- wash hands after each use
- children under 12 years: ask a doctor
- "Mentax (butenafine hydrochloride) Cream. Human Prescription Drug Label". dailymed.nlm.nih.gov. Mylan Pharmaceuticals Inc. Retrieved 24 August 2016.
- The Cochrane Library: Topical treatments for fungal infections of the skin and nails of the foot, 2009.
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