A Study to Evaluate AGN-151586 Intramuscular Injections in Adult Participants for Treatment of Glabellar Lines

Facial lines that develop from repeated facial expression, such as glabellar lines (GL), are typically treated by selectively weakening specific muscles with small quantities of botulinum toxin. The purpose of this study is to evaluate the safety and efficacy of AGN-151586 compared to placebo in adult participants. AGN-151586 is an investigational product being developed for the treatment of GL. In the first period, participants are randomly assigned to receive AGN-151586 or placebo. Each group receives a different treatment. There is a 1 in 3 chance that participants will be assigned to placebo. In the second period, all participants who meet retreatment criteria will receive open-label AGN-151586. Around 160 participants will be enrolled in the study at approximately 14 sites in China, Taiwan, and Japan. Participants will receive either AGN-151586 or Placebo administered as 5 intramuscular injections to the glabellar complex on Day 1. Eligible participants may then receive AGN-151586 injections on Day 43 and will be followed for up to 6 weeks. There may be higher treatment burden for participants in this trial compared to their standard of care due to multiple study visits. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects and completing questionnaires.