1. Candetral is an antifungal medication used to treat fungal infections such as gray toenails, athlete's foot, and gastrointestinal eczema. 2. It is available in capsule form and is taken orally. 3. This medicine works by killing fungus and preventing the growth of new fungus. . For best results, be sure to take your medications as prescribed by your doctor. Canditral is available for sale online and can be shipped to any address in the United States.