title: Topically applied botulinum toxin type A for the treatment of primary axillary hyperhidrosis: results of a randomized, blinded, vehicle-controlled study.
abstract: OBJECTIVE
  The objective was to demonstrate that botulinum toxin type A (BTX-A) can be delivered to targeted skin sites with topical application for the treatment of primary axillary hyperhidrosis.
  
  
  METHODS
  This randomized, blinded, vehicle-controlled study enrolled 12 patients with primary axillary hyperhidrosis with greater than 50 mg of sweat produced per 5 minutes. BTX-A (200 U), combined with a proprietary transport peptide molecule to bind the toxin in a noncovalent manner, was topically applied to one axilla; vehicle without BTX-A was applied to the other axilla. Rates of sweat production were measured and imaged at baseline and 4 weeks after application.
  
  
  RESULTS
  Two patients were excluded from analyses. At 4 weeks, 10 axillae treated topically with BTX-A demonstrated a 65.3+/-21.5% mean reduction in sweating relative to the same-patient, vehicle-control axillae, which had a 25.3+/-66.2% mean reduction. The 40% difference in mean sweat reduction between groups was statistically significant (p<.05). Quantitative image analysis of the results of the Minor's iodine starch test confirmed the reduction of sweat production in the BTX-A-treated versus the vehicle-treated axillae.
  
  
  CONCLUSIONS
  Topically applied BTX-A appears to be safe and may prove to be effective for the treatment of axillary hyperhidrosis.
authors.affiliation: University of California at San Francisco, San Francisco, California 94117, USA. rglogau@aol.com
authors.forename: Richard G
authors.initials: RG
authors.lastname: Glogau
mesh_terms: D000287:Administration, Topical; D001365:Axilla; D019274:Botulinum Toxins, Type A / Q000008:administration & dosage*; D006801:Humans; D006945:Hyperhidrosis / Q000188:drug therapy*; D014677:Pharmaceutical Vehicles
chemical_list: D014677:Pharmaceutical Vehicles; D019274:Botulinum Toxins, Type A