Some individuals have overactive sweat glands. This condition is called hyperhidrosis. It leads to sweaty palms (palmar) or constantly damp underarms (axillary). Some people prefer to find a solution to this for both hygiene and aesthetic purposes. Botox Cosmetic works on overactive sweat glands by temporarily reducing the activity of the nerves in the area being treated.
This is an option that usually works well for armpit sweating. Treatment consists of many small injections just under the skin in the affected areas. The botulinum toxin stops the nerves in the skin that control the sweat glands from working. Botulinum toxin is not licensed to treat sweating of the palms and face. This is because there is a risk that the injections may stop some of the nearby small muscles of the hands or face from working.
The downside of botulinum toxin is that the effect usually wears off after 4-12 months. Therefore, to keep working, the treatment needs repeating when the effect wears off.
Some people get mild flu-like symptoms for a day or so after treatment. Also, the sites of the injections can be sore for a few days after treatment. A severe allergic reaction can (rarely) occur after an injection. It is also very expensive and not usually available on the NHS.