Viloxazine ER (extended-release capsules; Qelbree®) is a nonstimulant medication, FDA-approved for ADHD in children (≥6 years) and adults. Efficacy and safety for children and adolescents were evaluated in one phase 2 [NCT02633527]and four phase 3 [NCT03247517, NCT03247556, NCT03247530, and NCT03247543], double-blind (DB), placebo-controlled trials that fed into a long-term, open-label extension (OLE) trial [NCT02736656]. Here we report the findings from this OLE trial.

Participants completing the DB trials were eligible for the OLE. Viloxazine ER was initiated at 100 mg/day (children) or 200 mg/day (adolescents) and adjusted (if needed) over a 12-week Dose-Optimization Period (up to 400 mg/day [children] or 600 mg/day [adolescents]). Maintenance treatment then continued up to 72 months. Safety assessments included adverse events (AEs), clinical laboratory tests, vital signs, ECG (12-lead), and the Columbia Suicide Severity Rating Scale (C-SSRS). Efficacy assessments included the ADHD Rating Scale, 4th (Phase 2) or 5th (Phase 3) Edition (ADHD-RS-IV/5), and the Clinical Global Impression-Improvement (CGI-I) scale. Efficacy was assessed relative to DB baseline at study visits ˜ 3 months apart. Two response measures, 50% improvement in ADHD-RS-IV/5 Total score and CGI-I score of 1-2, were also evaluated.

1100 individuals (646 children; 454 adolescents; 66.5% male/33.5% female) received treatment. Median (range) exposure to viloxazine ER was 260 (1 to 1896) days. AEs were reported by 57.3% participants, most commonly (≥5%) nasopharyngitis (9.7%), somnolence (9.5%), headache (8.9%) decreased appetite (6.0%), and fatigue (5.7%). AEs were mostly mild or moderate in severity (3.9% reported any severe AE); AEs led to viloxazine ER discontinuation for 8.2%. The mean (SD) changes from DB baseline in ADHD-RS IV/5 Total score were -17.0 (14.18) (viloxazine ER) and -11.2 (13.19) (placebo) at the last DB study visit, 24.3 (11.96) at OLE Month 3, and 22.4 (13.62) at participants’ last OLE study visit. ADHD-RS-IV/5 and CGI-I responder rates each exceeded 65% at all OLE visits following Dose-Optimization.

The safety and efficacy of viloxazine ER were maintained with long-term use in children and adolescents with ADHD. No new safety concerns emerged, and efficacy results suggested potential for continued improvement over that seen during DB treatment.

Supernus Pharmaceuticals, Inc.