Prospective, Double-Blind, Randomized, Parallel-Group, Dose-Ranging Study of Botulinum Toxin Type A in Men with Glabellar Rhytids
Article first published online: 21 MAR 2006
Volume 31, Issue 10, pages 1297–1303, October 2005
How to Cite
Carruthers, A. and Carruthers, J. (2005), Prospective, Double-Blind, Randomized, Parallel-Group, Dose-Ranging Study of Botulinum Toxin Type A in Men with Glabellar Rhytids. Dermatologic Surgery, 31: 1297–1303. doi: 10.1111/j.1524-4725.2005.31206
- Issue published online: 21 MAR 2006
- Article first published online: 21 MAR 2006
Background. The effective dose for treating glabellar lines with botulinum toxin type A in men has not been studied adequately.
Objective. To compare the safety, efficacy, and duration of response of four doses of botulinum toxin type A on glabellar rhytids in men.
Methods. Eighty men were randomized to receive a total dose of either 20, 40, 60, or 80 U of botulinum toxin type A (BOTOX, BOTOX Cosmetic, or Vistabel, Allergan, Inc., Irvine, CA, USA) in the glabellar area. Glabellar lines were assessed at rest and maximum frown by a trained observer at baseline, 2 and 4 weeks, and monthly thereafter. Patients provided self-evaluations at the same visits. Adverse events were monitored throughout.
Results. The 40, 60, and 80 U doses of botulinum toxin type A were consistently more effective in reducing glabellar lines than the 20 U dose (duration, peak response rate, improvement from baseline). There was a dose-dependent increase in both the response rate at maximum frown and the duration of effect assessed by the trained observer. In addition, the participants reported a dose-dependent reduction in the ability to frown, improvement in their global assessment, and increased feelings of attractiveness, self-confidence, and satisfaction. The incidence of adverse events was not increased with higher doses.
Conclusion. Male participants with glabellar rhytids benefit from starting doses of at least 40 U of botulinum toxin type A.