This video by Mr Usman Jaffer is about the drugs available to treat hyperhidrosis. Anticholinergic drugs block hormones which transmit signals across the nerves supplying the sweat gland, thus reducing sweating. Some potential issues are other anticholinergic effects in different parts of the body, including constipation, double vision, dry mouth, etc. This limits its usefulness in patients but as with all treatments and therapies, the best option depends on the individual.