title: Dopamine serotonin stabilizer RP5063: A randomized, double-blind, placebo-controlled multicenter trial of safety and efficacy in exacerbation of schizophrenia or schizoaffective disorder.
abstract: The study objectives were to evaluate the efficacy, safety, tolerability, and pharmacokinetics of RP5063 versus placebo. The study was conducted in adults with acute exacerbation of schizophrenia or schizoaffective disorder. This 28-day, multicenter, placebo-controlled, double-blind study randomized 234 subjects to RP5063 15, 30, or 50mg; aripiprazole; or placebo (3:3:3:1:2) once daily. The aripiprazole arm was included solely to show assay sensitivity and was not powered to show efficacy. The primary endpoint was change from baseline to Day 28/EOT (End-of-Treatment) in Positive and Negative Syndrome Scale (PANSS) total score; secondary endpoints included PANSS subscales, improvement ≥1 point on the Clinical Global Impressions-Severity (CGI-S), depression and cognition scales. The primary analysis of PANSS Total showed improvement by a mean (SE) of -20.23 (2.65), -15.42 (2.04), and -19.21 (2.39) in the RP5063 15, 30, and 50mg arms, versus -11.41 (3.45) in the placebo arm. The difference between treatment and placebo reached statistical significance for the 15mg (p=0.021) and 50mg (p=0.016) arms. Improvement with RP5063 was also seen for multiple secondary efficacy outcomes. Discontinuation for any reason was much lower for RP5063 (14%, 25%, 12%) versus placebo (26%) and aripiprazole (35%). The most common treatment-emergent adverse events (TEAE) in the RP5063 groups were insomnia and agitation. There were no significant changes in body weight, electrocardiogram, or incidence of orthostatic hypotension; there was a decrease in blood glucose, lipid profiles, and prolactin levels. In conclusion, the novel dopamine serotonin stabilizer, RP5063 is an efficacious and well-tolerated treatment for acute exacerbation of schizophrenia or schizoaffective disorder.
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA. Electronic address: mcantillon@revivapharma.com.
authors.forename: Marc
authors.initials: M
authors.lastname: Cantillon
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA.
authors.forename: Arul
authors.initials: A
authors.lastname: Prakash
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA.
authors.forename: Ajay
authors.initials: A
authors.lastname: Alexander
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA.
authors.forename: Robert
authors.initials: R
authors.lastname: Ings
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA.
authors.forename: Dennis
authors.initials: D
authors.lastname: Sweitzer
authors.affiliation: Reviva Pharmaceuticals Inc., 3900 Freedom Circle, Suite 101, Santa Clara, CA 95054, USA.
authors.forename: Laxminarayan
authors.initials: L
authors.lastname: Bhat
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000097:blood / Q000627:therapeutic use*; D004298:Dopamine; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007391:International Cooperation; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000097:blood / Q000188:drug therapy*; D012559:Schizophrenia / Q000097:blood / Q000188:drug therapy*; D012701:Serotonin; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D014150:Antipsychotic Agents; D012701:Serotonin; D004298:Dopamine
keywords: Efficacy; Partial agonist; RP5063; Safety; Schizoaffective; Schizophrenia; Stabilizer; Trial