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Oxybutynin is an anticholinergic medication indicated for treatment of overactive bladder. As might be predicted, it also has beneficial effects on overactive sweating.
A prospective, randomized 6-week trial compared low doses of oxybutynin to placebo for treatment of hyperhidrosis. The investigators enrolled 62 consecutive patients with localized or generalized hyperhidrosis. All patients had grade 2 or greater palmar, plantar, axillary, facial, or truncal primary hyperhidrosis as assessed by the Hyperhidrosis Disease Severity Score (HDSS). Participants initially received either oxybutynin or placebo 2.5 mg/day. If hyperhidrosis was not controlled, the dose was increased to 5.0 mg/day on day 4 and to 7.5 mg/day on day 8. The primary endpoin…