Take action as soon as you step out of the shower to stave off perspiration for the rest of the day, suggests Dr. Wu. You haven’t got a chance if you’re already sweating before you get to the deodorant, so she suggests using a hair dryer to blow cool air under your arms before you apply. If this doesn’t cut it, extra strength antiperspirants (such as Dove Clinical Protection or Secret Clinical Strength) might do the trick. In extreme cases, Dr. Wu says your dermatologist might recommend Botox injections to help with excessive sweating. “Botox stops sweating by blocking the signal from the nerve endings that tell the sweat glands to secrete sweat,” she explains.