Botox for hyperhidrosis is a botulinum toxin treatment injected superficially into areas of excessive sweating to reduce sweat gland activity. It is intended for people with excessive sweating of the underarms, palms or feet and can provide long-lasting dryness and greater everyday comfort. The procedure is minimally invasive and can significantly reduce sweating with a quick return to daily activities. Results usually last 6 to 9 months, and sometimes longer.