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  • Title: A multicenter, randomized, double-blind, placebo-controlled study of efficacy and safety of 3 doses of botulinum toxin A in the treatment of glabellar lines.
    Author: Ascher B, Zakine B, Kestemont P, Baspeyras M, Bougara A, Santini J.
    Journal: J Am Acad Dermatol; 2004 Aug; 51(2):223-33. PubMed ID: 15280841.
    Abstract:
    BACKGROUND: Botulinum toxin A (BTX-A) is used to treat glabellar lines but the rigorous demonstration of its efficacy in a well-designed study had never been reported. OBJECTIVE: This study was designed to evaluate the efficacy and the safety of 3 doses of BTX-A in the treatment of glabellar lines. METHODS: A total of 119 patients with moderate to severe glabellar lines at rest were treated with 25, 50, or 75 U of BTX-A (Dysport, Ipsen) or placebo divided into 5 intramuscular glabellar sites. Outcome measures included evaluations of glabellar lines by independent experts from blinded standardized photographs at rest 1 month after treatment, physician evaluations, and patient assessments during a 6-month period. RESULTS: A significant efficacy was reported for the 3 BTX-A groups for at least 3 months after injection (at least P <.015). Investigator and patient evaluations suggested that 50 U was the optimal dose. BTX-A was well tolerated. No blepharoptosis was reported. An evaluation in blinded conditions by independent experts was necessary because the results were overestimated by the investigators. CONCLUSION: BTX-A is an effective and safe treatment for glabellar lines.
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