The active ingredient that kills athlete's foot is typically a type of antifungal medication. This medication can come in a variety of forms, including creams, ointments, sprays, and powders. Common active ingredients in these products include clotrimazole, miconazole, terbinafine, and tolnaftate. These antifungal medications work by killing the fungus that causes athlete's foot, as well as helping to reduce the inflammation and discomfort associated with the condition.
It is important to follow the directions on the product label when using these antifungal medications. Generally, the affected areas should be washed and dried thoroughly before application of the product. The medication should be applied one to two times per day, or as directed by a doctor. Treatment should continue until the symptoms of athlete's foot have completely cleared up. In some cases, it may take several weeks of treatment before the infection is completely gone.
If symptoms of athlete's foot persist or worsen, it is important to see a doctor to rule out any other underlying conditions. A doctor may prescribe a stronger antifungal medication, or a combination of medications, to treat the infection.