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Cariprazine showed modest weight reduction versus aripiprazole in schizophrenia patients previously treated with olanzapineCariprazine shows modest weight benefit over aripiprazole in schizophrenia patients

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Key Takeaway
Consider cariprazine for modest weight reduction in patients switching from olanzapine, but note the small effect size.

This randomized controlled trial investigated the metabolic effects of switching from olanzapine to either cariprazine or aripiprazole in patients with schizophrenia. The study focused on body weight as the primary outcome, alongside secondary measures including BMI, waist-to-hip ratio, and lipid profiles. Both treatment arms demonstrated significant improvements in these anthropometric and cardio-metabolic markers over the follow-up period.

The analysis revealed a significant interaction between treatment and time regarding body weight. Cariprazine was associated with a modestly greater reduction in weight compared to aripiprazole. However, the main treatment effect was not statistically significant, and the absolute difference in weight reduction between the two groups was described as small in magnitude.

The authors highlight limitations including the small magnitude of the observed difference and the necessity for larger, multicentre, long-term studies to validate these results. They advise that any potential metabolic advantage of cariprazine over aripiprazole should be interpreted cautiously. No serious adverse events or discontinuations were reported in this specific study.

Researchers conducted a randomized controlled trial involving 98 patients with schizophrenia who had previously taken olanzapine. These participants were switched to either cariprazine or aripiprazole for a period of 12 weeks at a tertiary care center. The study aimed to compare how these two medications affected body weight and other metabolic health markers.

The results showed a significant interaction between treatment type and time regarding body weight. Specifically, patients taking cariprazine experienced a modestly greater reduction in weight compared to those on aripiprazole. The average difference in weight loss was 0.82 kilograms. Both groups also saw improvements in various health measures within themselves over the study period.

However, the study authors note that the magnitude of the weight difference was small. They caution that these findings should be interpreted carefully and suggest that larger, multicenter studies with longer follow-up are needed to confirm these results. No serious adverse events or discontinuations were reported during the trial. Readers should understand that while a potential metabolic advantage exists, it is not a guaranteed outcome and requires further verification before changing treatment plans.

What this means for you:
Cariprazine showed small weight loss advantage over aripiprazole in a short-term trial of schizophrenia patients.

Study Details

Study typeRct
EvidenceLevel 2
Follow-up2.8 mo
PublishedMay 2026
View Original Abstract ↓
BACKGROUND: Schizophrenia is a chronic, disabling psychotic disorder frequently treated with second-generation antipsychotics (SGAs). Although effective, SGAs such as olanzapine carry metabolic risks that elevate cardiovascular morbidity. Dopamine receptor partial agonists (DRPAs) like aripiprazole and cariprazine may mitigate these risks due to low H1 and 5-HT2C receptor affinity. While aripiprazole has shown some efficacy in reversing antipsychotic-induced weight gain, direct comparisons with cariprazine in olanzapine-switched patients are limited. METHODS: In this 12-week, randomized, parallel-arm trial at a tertiary care center, 98 schizophrenia patients previously on olanzapine were randomized (1:1) to cariprazine or aripiprazole. Assessments at baseline, week 6, and week 12 included weight, body mass index (BMI), waist-to-hip ratio, lipid profile, RBS, HbA1c, Positive and Negative Syndrome Scale (PANSS) and Social and Occupational Functioning Assessment Scale (SOFAS). Statistical analyses were performed using per-protocol approach with a linear mixed-effects models. RESULTS: Linear mixed-effects models showed a significant effect of time on body weight (F (2,176) = 11541.07, p < 0.001) and a significant treatment × time interaction (F (2,176) = 149.42, p < 0.001), while the main treatment effect was not significant (F (1, 88) = 1.34, p = 0.249). Compared with aripiprazole, cariprazine was associated with a modestly greater weight reduction over 12 weeks (mean difference = 0.82 kg). Both groups demonstrated significant within-group improvements for anthropometric, cardio-metabolic and clinical measures over 12 week; however, inter-group differences were not significant. CONCLUSION: Over the 12-week study period, cariprazine demonstrated greater reductions in weight than aripiprazole while maintaining comparable clinical efficacy; however with small magnitude of difference, any potential metabolic advantage should be interpreted cautiously. Larger, multicentre long-term studies are needed to confirm these findings. CLINICAL TRIAL REGISTRATION NUMBER: CTRI/2024/02/062615 (Registered with Clinical Trials Registry- India).
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