Adriana Foster1, Peter Buckley, John Lauriello, Stephen Looney, Nina Schooler. 1. From the *Department of Psychiatry and Behavioral Health, Herbert Wertheim College of Medicine, Florida International University, Miami, FL; †Medical College of Georgia, Augusta University, GA; ‡Department of Psychiatry, University of Missouri, MO; Departments of §Biostatistics and Epidemiology, and ∥Oral Health and Diagnostic Sciences, Augusta University, GA; and ¶Schizophrenia Research Program, Department of Psychiatry, SUNY Downstate Medical Center, NY.
Abstract
BACKGROUND:Combination antipsychotics (CAs) are prescribed in schizophrenia despite limited evidence of efficacy. To explore the effect of switching from CA to monotherapy, we performed an exploratory analysis of the PROACTIVE (Preventing Relapse in Schizophrenia: Oral Antipsychotics Compared with Injectables: Evaluating Efficacy) study data, in which 305 patients with schizophrenia and schizoaffective disorder were followed for 30 months after randomization to long-acting injectable (LAI) risperidone or second-generation oral antipsychotic (OA). METHODS:Patients who entered the PROACTIVE study on CA (n = 50), LAI (n = 20), or OA (n = 206) were compared in terms of time to relapse and clinical measures. FINDINGS: The OA group had significantly fewer hospitalizations than the CA group (P = 0.009) at baseline. In the CA group, 68% patients relapsed versus 53% in the LAI, and 52% in the OA groups. Although there was no significant difference in the relapse rate among groups on χ test (χ = 3.85, P = 0.146), the log-rank test showed a significant difference among the groups in time to first relapse (χ = 6.81, P = 0.033), with significantly longer time to relapse in the OA group (mean, 562.8 days) than in the CA group (mean, 409.5; P = 0.011). The LAI group's mean time to first relapse (594 days) was not significantly different from the other groups. However, after adjusting for number of hospitalizations, group was no longer significant (hazard ratio, 1.541; P = 0.052). IMPLICATIONS: Based on our exploratory analysis, taking antipsychotic combinations predicts earlier relapse and calls for additional treatment guidance in schizophrenia.
RCT Entities:
BACKGROUND: Combination antipsychotics (CAs) are prescribed in schizophrenia despite limited evidence of efficacy. To explore the effect of switching from CA to monotherapy, we performed an exploratory analysis of the PROACTIVE (Preventing Relapse in Schizophrenia: Oral Antipsychotics Compared with Injectables: Evaluating Efficacy) study data, in which 305 patients with schizophrenia and schizoaffective disorder were followed for 30 months after randomization to long-acting injectable (LAI) risperidone or second-generation oral antipsychotic (OA). METHODS:Patients who entered the PROACTIVE study on CA (n = 50), LAI (n = 20), or OA (n = 206) were compared in terms of time to relapse and clinical measures. FINDINGS: The OA group had significantly fewer hospitalizations than the CA group (P = 0.009) at baseline. In the CA group, 68% patients relapsed versus 53% in the LAI, and 52% in the OA groups. Although there was no significant difference in the relapse rate among groups on χ test (χ = 3.85, P = 0.146), the log-rank test showed a significant difference among the groups in time to first relapse (χ = 6.81, P = 0.033), with significantly longer time to relapse in the OA group (mean, 562.8 days) than in the CA group (mean, 409.5; P = 0.011). The LAI group's mean time to first relapse (594 days) was not significantly different from the other groups. However, after adjusting for number of hospitalizations, group was no longer significant (hazard ratio, 1.541; P = 0.052). IMPLICATIONS: Based on our exploratory analysis, taking antipsychotic combinations predicts earlier relapse and calls for additional treatment guidance in schizophrenia.
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