Topical Botulinum Toxin: A 2007 Sweat Study

Ten paired comparisons

A blinded 2007 study enrolled 12 adults, six women, with primary underarm hyperhidrosis. At least 50 mg per five minutes was required. One randomly assigned underarm received topical botulinum toxin A with a proprietary transport peptide; the other received matching vehicle without toxin. All finished; two were excluded from analysis because baseline sweating differed too much between sides.¹

At four weeks, five-minute sweat weights fell 65.3% versus 25.3%, on average, from baseline. Those are sweat reductions, not percentages of people cured. Longer benefit was untested; injections were not a comparator. Four local adverse events occurred on vehicle sides; none systemic were reported. This sample cannot exclude uncommon harms. Revance funded the study; its author was a consultant.¹

What the injection label covers

The US BOTOX label covers adults with severe primary underarm sweating inadequately controlled by topical treatments. The underarm route is injection into the skin. Potency units cannot be converted between botulinum toxin products.²

The label warns that toxin effects can spread beyond injection sites. Seek immediate medical care for trouble swallowing, speaking or breathing after treatment. Discuss existing swallowing, breathing or neuromuscular problems beforehand. Injection-site infection and allergy to botulinum toxin or formulation components are contraindications.²

Bring the formulation question

AAD³ describes antiperspirants, glycopyrronium cloths and sofpironium gel among skin-applied options. Ask your dermatologist to identify the proposed product, route, expected benefit and adverse effects. Bring your medicine list, the areas affected, how often sweating happens and its effect on daily activities. Diagnosis and treatment depend on that history.³

Arms Up includes “The Step-Up Conversation”: ask what a treatment was compared with, how long benefit lasts, common side effects and continuing costs. Record the body area that matters most and what you have already tried. A product name and route belong alongside the trial result in those notes.