Lotrimin Ultra 1 Week Athlete's Foot Treatment Prescription Strength Butenafine HydrochlorideLotrimin Ultra 1 Week Athlete's Foot Treatment Prescription Strength Butenafine Hydrochloride ONE WEEK TREATMENT: Cure most athlete's foot between the toes in one week while providing effective relief from the itching and burning of athlete's foot. PROVEN TO CURE MOST ATHLETE'S FOOT: Kills the natural fungus that causes tinea pedis in athletes and others, commonly known as athlete's foot. PRESCRIPTION STRENGTH FORMULA: Lotrimin Ultra contains