title: Lower relapse rate of botulinum toxin A therapy for axillary hyperhidrosis by dose increase.
abstract: BACKGROUND
  Primary focal hyperhidrosis is a common condition that gives rise to functional and emotional problems and may disturb professional and social life. Recently, low-dose intracutaneous injections of botulinum toxin A have been shown to induce a temporary anhidrosis, with relapses occurring usually after 4 to 6 months.
  
  
  OBJECTIVE
  To evaluate the short- and long-term effectiveness and possible adverse effects of high-dose botulinum toxin therapy in the treatment of axillary hyperhidrosis.
  
  
  METHODS
  In an open study, patients with focal hyperhidrosis were treated with intracutaneous injections of botulinum toxin A (Botox; Allergan Inc, Irvine, Calif). A total dose of 200 U of botulinum toxin A was used once per axilla. Patients were observed for up to 15 months.
  
  
  METHODS
  University medical center.
  
  
  METHODS
  Twenty-four patients with axillary hyperhidrosis were treated. Their ages ranged from 19 to 58 years (mean +/- SD, 34.8 +/- 12.4 years).
  
  
  METHODS
  Reduction of sweating as assessed by the Minor iodine-starch test and planimetry of hyperhidrotic areas. Patients were interviewed at the end of follow-up about their satisfaction with this treatment.
  
  
  RESULTS
  Within 6 days, all patients reported cessation of excessive sweating. The mean +/- SD area of excessive sweating identified by the Minor iodine-starch test decreased from 19.27 +/- 11.95 cm2 to 0.25 +/- 0.61 cm2 (P<.001). The mean follow-up was 10.0 +/- 2.8 months (range, 5-15 months). Four patients (17%) reported a return of axillary hyperhidrosis after 7 to 10 months. All patients who experienced relapse showed an excellent response to a second treatment. The only adverse effects reported were temporary pain and burning during the injections. No muscular weakness, insensitivity, or systemic reactions were observed.
  
  
  CONCLUSIONS
  High-dose botulinum toxin A seems to be as safe as low-dose botulinum toxin A in the treatment of axillary hyperhidrosis. The preliminary data suggest a lower rate of relapse.
authors.affiliation: Department of Dermatology, Friedrich Schiller University of Jena, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Karamfilov
authors.forename: H
authors.initials: H
authors.lastname: Konrad
authors.forename: K
authors.initials: K
authors.lastname: Karte
authors.forename: U
authors.initials: U
authors.lastname: Wollina
mesh_terms: D000328:Adult; D001365:Axilla; D019274:Botulinum Toxins, Type A / Q000008:administration & dosage* / Q000009:adverse effects; D003879:Dermatologic Agents / Q000008:administration & dosage* / Q000009:adverse effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D006945:Hyperhidrosis / Q000188:drug therapy*; D007271:Injections, Intradermal; D008297:Male; D008875:Middle Aged; D055502:Secondary Prevention; D016896:Treatment Outcome
chemical_list: D003879:Dermatologic Agents; D019274:Botulinum Toxins, Type A