Lotrimin Ultra Antifungal Cream Cures Most Athlete's Foot Between The Toes. Lotrimin Ultra cream uses the latest prescription strength ingredient to cure most Athlete's Foot, while providing effective relief from the itching, burning, cracking and discomfort, which can accompany Athlete's Foot. The 1 Week Killer Cure, Butenafine Hydrochloride 1% (Antifungal), Penetrates to kill the fungus right where it starts, Relieves Itching & Burning. Full Prescription Strength.