Iontophoresis is a successful treatment for excessively sweaty feet, hands, and other parts of the body. It is a drug-free and non-invasive therapy performed in a doctor’s office, wherein a light electrical current is passed through water into the area being treated, such as the feet. The water conducts the mild electrical current through the skin’s surface, blocking the sweat before it reaches the skin’s surface. Treatment can require one or several short sessions that last about 20 minutes each.