Positive topline results from second phase III study of OnabotulinumtoxinA (Botox Cosmetic) for the treatment of platysma prominence

Platysma prominence is an aesthetically unappealing disruption to the neck, jawline and lower face that is attributed to contraction of the platysma muscle, a superficial, flat muscle in the lower face and neck.

"We are encouraged by these results, which demonstrated a significant reduction in the unwanted appearance of vertical band prominence on the neck and jawline," said Darin Messina, Ph.D., senior vice president, aesthetics R&D, AbbVie. "These results provide strong evidence in support of onabotulinumtoxinA as a potential treatment option for platysma prominence and once approved, will expand our neurotoxin portfolio into the lower face segment."

The multicenter, randomized, double-blind, placebo-controlled study evaluated the safety and efficacy of a single treatment of onabotulinumtoxinA (Botox Cosmetic) versus placebo in 426 adult subjects with moderate to severe platysma prominence. The primary endpoint was met, demonstrating statistical significance for improvement with onabotulinumtoxinA (Botox Cosmetic) versus placebo (p<0.0001) for the improvement in appearance of platysma prominence from baseline (based on both investigator and subject assessment). all secondary endpoints were met, as measured by multiple validated, proprietary patient-reported outcome (pro) instruments assessing how bothered subjects are by the appearance of platysma prominence, psychosocial impact, treatment expectations and treatment satisfaction from the subject perspective.></0.0001)>

Treatment-emergent adverse events for onabotulinumtoxinA (Botox Cosmetic) were generally mild and consistent with known pharmacological effects of onabotulinumtoxinA and medical literature. OnabotulinumtoxinA (Botox Cosmetic) has a well-established safety profile and no new safety signals were observed. Results were consistent with topline results from the first Phase III study (M21-309), announced in April 2023.

"Platysma prominence occurs as part of the natural aging process and patients need non-invasive treatment options for the appearance of the lower face and neck and to help improve symmetry between the upper and lower face," said Sachin Shridharani, MD, FACS, lead clinical investigator for the M21-310 study. "Treatment with a proven neurotoxin may help relax the platysma muscle and thus reduce the appearance of vertical neck bands and improve jawline definition."

Additional study results will be submitted for presentation at future medical meetings. A Phase III open-label extension study is ongoing, with results expected later this year. Allergan Aesthetics will include data from the full Phase III study program as part of an upcoming FDA regulatory submission expected near the end of the year.