Long-Term Improvement and Safety of Aripiprazole for Irritability and Adaptive Function in Asian Children and Adolescents with Autistic Disorder: A 52-Week, Multinational, Multicenter, Open-Label Study

Objective: Evaluate the long-term improvement and safety of aripiprazole in treating irritability in Asian children and adolescents (6–17 years) with autistic disorder. Methods: A 52-week, open-label, flexibly dosed (2–15 mg/day) study on the improvement and safety of aripiprazole in patients with autistic disorder who had completed an antecedent 12-week open-label study. The evaluation of efficacy was conducted using the Aberrant Behavior Checklist (ABC), Clinical Global Impression (CGI) scale, Child Yale-Brown Obsessive-Compulsive Scale (CY-BOCS), Vineland Adaptive Behavior Scale (VABS), and the Parenting Stress Index-Short Form (PSI-SF). Safety and tolerability measurements included adverse events, vital signs, electrocardiography, laboratory tests, body weight, and extrapyramidal symptoms (EPSs). Results: During the 52-week treatment, all effectiveness variables, including ABC, CGI, CY-BOCS, VABS, and PSI-SF scores, showed improvement. Regarding safety, the proportion of patients who experienced any treatment-emergent adverse events (TEAEs) was 58.62% (34/58 subjects, 75 cases). The most common TEAE was nasopharyngitis reported in 20.69% (15/58 subjects, 15 cases) and the other TEAE with an incidence of ‡10% was weight increases in 18.97% (11/58 subjects, 11 cases). Of them, 27.59% (16/58 subjects, 28 cases) experienced adverse drug reactions (ADRs). The most common ADR was weight increase reported in 15.52% (9/58 subjects, nine cases). The incidence of serious adverse events (SAEs) was 5.17% (3/ 58 subjects, three cases), which were epiphysiolysis, seizure, and a suicide attempt, but these were not ADRs. There were no clinically significant changes found in the evaluation of EPSs. Conclusions: Aripiprazole showed improvement for behavioral problems and adaptive functioning and was well tolerated in patients with autistic disorder until nearly a year after drug use.