Long-term results for incobotulinumtoxinA in the treatment of glabellar frown lines.

BACKGROUND: IncobotulinumtoxinA has been approved for treatment of glabellar frown lines (GFL) in the United States, all major European markets, South Korea, and Argentina and in Russia and Mexico for the treatment of mimic wrinkles and hyperkinetic facial lines, respectively. OBJECTIVES: Prospective, 2-year, open-label, multicenter, repeat-dose, Phase III trial investigating the safety and efficacy of incobotulinumtoxinA for the treatment of GFL. METHODS: Subjects with moderate or severe GFL on the Facial Wrinkle Scale (FWS), enrolled from previous trials, were treated with 20 U of incobotulinumtoxinA per cycle (up to eight treatment cycles, treatment interval at least 85 days). Efficacy was measured according to the investigator-assessed percentage of responders on the FWS (subjects with a score of 0 or 1) at rest and maximum frown on Day 30 of each cycle, subject assessments, and onset and duration of treatment effect. RESULTS: In 796 subjects, 77% to 88% were responders at rest, and 79% to 90% were responders at maximum frown. Onset was rapid; subjects reported effects in the first few days after treatment. No new tolerability or safety concerns were reported. CONCLUSIONS: IncobotulinumtoxinA injections were well tolerated and resulted in efficacy in the treatment of GFL for up to 2 years.