Butenafine and its Impurities

Butenafine, sold under the brand names Lotrimin Ultra, Mentax, and Butop, it is used to a topical antifungal used to treat tinea versicolor, tinea pedis, tinea cruris, and tinea corporis. Reference standards of Butenafine API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.