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Efficacy and Tolerability of Aripiprazole Versus D2 Antagonists in the Early Course of Schizophrenia: a Systematic Review and Meta-Analysis David D

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Efficacy and Tolerability of Aripiprazole Versus D2 Antagonists in the Early Course of Schizophrenia: a Systematic Review and Meta-Analysis David D Efficacy and tolerability of aripiprazole versus D2 antagonists in the early course of schizophrenia: a systematic review and meta-analysis David D. Kim, MSc1,2; Alasdair M. Barr, PhD1,2; Lulu Lian1; Jessica W. Y. Yuen, PhD1; Diane Fredrikson, MD3; William G. Honer, MD2,3; Allen E. Thornton, PhD2,4; Ric M. Procyshyn, PharmD, PhD2,3 1) Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, Canada; 2) BC Mental Health & Substance Use Services Research Institute, Vancouver, Canada; 3) Department of Psychiatry, University of British Columbia, Vancouver, Canada; 4) Department of Psychology, Simon Fraser University, Burnaby, Canada Table 2. Significant differences between aripiprazole and individual D2R antagonists Introduction • Early intervention is fundamental for better treatment response and long-term outcomes in schizophrenia. • However, there is little guidance in the scientific literature on how best to choose between dopamine D2 receptor (D2R) partial agonists and D2R antagonists for early psychosis. • In this meta-analysis, D2R partial agonists were directly compared with D2R antagonists for efficacy and tolerability in the early course of schizophrenia. Methods • MEDLINE, Embase, PsycINFO, and ClinicalTrials.gov databases were searched up to 15 July 2020, with no language restriction. ARI: aripiprazole; DC: discontinuation • Inclusion criteria: 1) randomized controlled trials (RCTs) that compared D2R partial agonists with D2R antagonists for efficacy and tolerability and 2) diagnosis of first-episode psychosis or 3) Results (continued) diagnosis of schizophrenia or related psychotic disorders with a duration of illness ≤5 years or with no history of antipsychotic • Aripiprazole was more favorable than pooled D2R antagonists for treatment. depressive symptoms, prolactin levels, and triglyceride levels • Overall symptom reduction was the primary outcome. (Table 1). • Other efficacy and tolerability (e.g., adverse effects) outcomes • Aripiprazole was more favorable than paliperidone for triglyceride were examined as secondary variables. levels, more favorable than risperidone and olanzapine, but less Fig. 3. Forest plot comparing overall symptom reduction between aripiprazole and D2R antagonists than ziprasidone, for weight gain, and more favorable than • Data were analyzed, using Cochrane RevMan 5.3, in a random- H: haloperidol; O: olanzapine; Pal: paliperidone; Per: perospirone; Q: quetiapine; R: risperidone; Z: ziprasidone; Short-term trials are effects model to calculate standardized mean differences (SMDs) defined as < 6 months and long-term trials ≥ 6 months. haloperidol for various efficacy and tolerability outcomes (Table 2). or risk ratios (RRs) with 95% confidence intervals (CIs). • Aripiprazole was less favorable than second-generation D2R Table 1. Significant differences between aripiprazole and pooled D2R antagonists antagonists for akathisia, in particular olanzapine and quetiapine, Results and less favorable for discontinuation due to inefficacy than risperidone (Table 2). • Fourteen RCTs, involving • Aripiprazole was more favorable than risperidone for overall 2494 patients, were symptom reduction in long-term trials (N = 3 trials, n = 198; SMD = included (Fig. 1). SUB HEADING -0.74, 95% CI = -1.25 to -0.24, p = 0.004 ), but not in short-term • Aripiprazole was the only trials (p = 0.34). identified D2R partial agonist. • Allocation concealment and blinding were most Fig. 1. Selection of studies Conclusions frequent regarding risk of bias (Fig. 2). • Our study found comparable efficacy between aripiprazole and • Aripiprazole was not D2R antagonists in the early course of schizophrenia. significantly different from • Aripiprazole may be more favorable for other symptom domains (e.g., depressive symptoms), and differential tolerability profiles pooled D2R antagonists regarding overall were observed. symptom reduction • More double-blind RCTs examining comparative effects of aSMD less than 0 and RR less than 1 indicate aripiprazole is favored compared with other antipsychotics. b,cBecame significant (i.e., (SMD=-0.05, 95% CI=- aripiprazole being less favorable) after removing haloperidol. H: haloperidol; O: olanzapine; Pal: paliperidone; Per: perospirone; Q: aripiprazole and other D2R partial agonists in the early course of Fig. 2. Risk of bias graph quetiapine; R: risperidone; RR: risk ratio; SMD: standardized mean difference; Z: ziprasidone. Short-term trials are defined as < 6 0.27 to 0.18) (Fig. 3). months and long-term trials ≥ 6 months. schizophrenia are required. Contact Information: David Donghyun Kim ([email protected]).
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