Patient-Reported Outcomes for Glabellar Line Improvement and Satisfaction With the RelabotulinumtoxinA Ready-to-Use Liquid Formulation: Data From the Phase 3 READY-1 Trial

Abstract Background RelabotulinumtoxinA (relaBoNT-A; Relfydess, Galderma, Uppsala, Sweden) is a novel, ready-to-use liquid form of botulinum toxin A, created using PEARL technology to produce a highly effective, complex-free formulation. Objectives This study reports the patient-assessed effectiveness and satisfaction outcomes from the relaBoNT-A Phase 3 READY-1 study. Methods Adults with moderate-to-severe glabellar lines were randomized 3:1 to receive relaBoNT-A (50 U) or placebo in a 6-month, double-blind, multicenter study. Patient-reported endpoints at maximum frown included ≥1 grade improvement on the glabellar line subject live assessment (GL-SLA) scale from baseline and Global Aesthetic Improvement Scale (GAIS) score. Satisfaction and well-being investigations used the Facial Lines Treatment Satisfaction Questionnaire (FLTSQ), Natural Expressions Questionnaire, and FACE-Q Psychological Function Questionnaire. Results Overall, 233 adults received relaBoNT-A and 74 received placebo. RelaBoNT-A responder rates for ≥1-grade GL-SLA improvement from baseline at Day 7 and Months 1, 3, and 6 were 97.2%, 97.7%, 90.0%, and 71.0%, respectively, vs 18.9%, 26.8%, 27.5%, and 22.4% with placebo (P < .001). GAIS responder rates were 74.3% to 98.1% (relaBoNT-A) and 9.0% to 16.2% (placebo). Posttreatment FLTSQ Rasch-transformed scores were higher with relaBoNT-A (≥62.5) than placebo (≤49.8) for the Appearance Module and Treatment Satisfaction Module (relaBoNT-A: ≥83.0; placebo: ≤36.8). RelaBoNT-A-treated patients reported looking natural (≥83.3%) and feeling confident when making facial expressions (≥75.7%). Mean change in FACE-Q well-being score was higher with relaBoNT-A (11.0-13.7) vs placebo (0.6-4.5). Conclusions Adults with moderate-to-severe glabellar lines receiving a single relaBoNT-A treatment reported significant improvements in glabellar line severity throughout the 6-month study period. RelaBoNT-A provided natural looking results, high satisfaction, and psychological well-being improvements. Level of Evidence: 1 (Therapeutic)