Terbinafine cream or spray
BMJ Group Medical Reference
Terbinafine is a drug that kills fungi. Athlete's foot is caused by a fungus.
Terbinafine belongs to a group of drugs called allylamines. It comes as a cream or spray that you rub into your skin.
The brand name for terbinafine is LamisilAT. You can get terbinafine cream with a prescription from your doctor, or you can buy it over the counter at a pharmacy. You can also buy terbinafine spray over the counter.
You'll probably need to use terbinafine for one week.  There is also a form of terbinafine that is applied once, and forms a film over infected skin.
Terbinafine cream seems to work well. In studies:
About 7 in 10 people who use terbinafine cream have no signs of athlete's foot six weeks later  
Terbinafine cream may work slightly faster than azole creams and sprays (another treatment for athlete's foot) 
Both treatments get rid of athlete's foot in most people.
Terbinafine seems to be safe. But some people have a mild skin reaction, such as a rash, or a burning or stinging sensation.  
A fungus is an organism that is sometimes considered to be a type of plant. A fungus lives by feeding on other organisms. The mushrooms we eat in salads are fungi, but so are candida and cryptococcus, which can cause infections in people's bodies.
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