Purpose: The limitations of current US Food and Drug Administration (FDA)eapproved medications for the treatment of attention-deficit/hyperactivity disorder (ADHD) set the need for the development of novel, effective, and tolerable medications to treat this disorder. The purpose of this study was to evaluate whether treatment with SPN-812 (viloxazine extended-release) significantly reduces symptoms of ADHD in children. Methods: This study was a randomized, doubleblind, placebo-controlled 6-week trial to assess the efficacy and safety of once-daily 100-and 200-mg SPN-812 in the treatment of ADHD in male and female children 6e11 years of age. Inclusion criteria required subjects to have a confirmed Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, ADHD diagnosis, an ADHD-Rating Scale-5 (ADHD-RS-5) score 28, a Clinical Global Impression-Severity score 4, and for subjects to be free of ADHD medication 1 week before randomization. The primary efficacy endpoint was the change from baseline (CFB) at end of study (EOS) in ADHD-RS-5 Total score. Key secondary endpoints included Clinical Global Impression-Improvement (CGI-I) scores at EOS and CFB at EOS in the Conners 3eParent Short Form (Conners 3ePS) Composite T-score and the Weiss Functional Impairment Rating ScaleeParent (WFIRSeP) Total average score. Safety assessments included adverse events (AEs), laboratory tests, vital signs, physical examinations, ECGs, and the Columbia-Suicide Severity Rating Scale. The primary efficacy endpoint was analyzed by using a mixed model for repeated measures; all secondary measures were analyzed by using an ANCOVA model. Results: A total of 477 subjects were randomized to treatment (intent-to-treat population, n ¼ 460). The majority of subjects were male (63%) and either White (51.3%) or African American (43.7%). The demographic and baseline characteristics between the groups were similar. Statistically significant improvements in ADHD-RS-5 Total score were observed in both the 100-and 200-mg/day SPN-812 treatment groups compared to placebo at week 1 of treatment (P ¼ 0.0004 and P ¼ 0.0244, respectively), which was maintained through EOS (P ¼ 0.0004 and P < 0.0001). Significant improvements were also observed at EOS in the CGI-I scale (P ¼ 0.0020 and P < 0.0001), Conners 3ePS Composite T-score

clinicaltrials.gov Identifier: NCT00683592.

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Purpose: SPN-812 (viloxazine extended-release) is under investigation for the treatment of attentiondeficit/hyperactivity disorder (ADHD) in children and adolescents. This Phase III study evaluated the efficacy and tolerability of SPN-812 200 and 400 mg once daily in children 6e11 years of age with ADHD. Methods: Patients were randomly assigned to receive SPN-812 200 mg, SPN-812 400 mg, or placebo, once daily for 8 weeks (including 3 weeks titration period). The primary efficacy endpoint was the change from baseline (CFB) in ADHD Rating Scale (RS)-5 Total score at end of study (EOS). Key secondary endpoints included Clinical Global ImpressioneImprovement (CGI-I) score at EOS, CFB in Conners 3eParent Short Form (PS) composite Tscore at EOS, and CFB in Weiss Functional Impairment Rating ScaleeParent (WFIRS-P) Total average score at EOS. Findings: A total of 313 patients were enrolled, with 301 in the intent-to-treat population (194 boys, 107 girls; mean age [SD], 8.4 [1.7] years). At EOS, the CFBs in ADHD-RS-5 Total score and CGI-I score were significantly improved with both 200-and 400mg/d SPN-812 versus placebo (ADHD-RS-5, P ¼ 0.0038 and 0.0063, respectively; CGI-I, P ¼ 0.0028 and 0.0099). At EOS, the CFB in Conners 3-PS composite T-score was significantly improved with 200-(P ¼ 0.0064), but not 400-mg/ d (P ¼ 0.0917), SPN-812 compared to placebo. No significant difference between the groups was found in WFIRS-P Total average score. The rate of discontinuations due to adverse events in both SPN-812 treatment groups combined was <5%. Implications: SPN-812 200 and 400 mg once daily was associated with improvements in ADHD symptoms in school-aged children and was generally well tolerated. ClinicalTrials.gov identifier: NCT03247543.