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5-HTR antagonists improve negative symptoms and cognition in schizophrenia, meta-analysis findsNew medications show promise for schizophrenia symptoms and cognition

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Key Takeaway
Consider 5-HTR antagonists as a potential adjunctive option, but await definitive trials.

This meta-analysis pooled data from 730 patients with schizophrenia to evaluate the efficacy of adjunctive 5-HTR antagonists (setrons, CVN058, and vortioxetine) versus placebo. The primary outcome was not reported, but secondary outcomes included negative symptoms, cognitive impairment associated with schizophrenia (CIAS), positive symptoms, and total symptoms.

For negative symptoms, the active drugs showed a significantly greater effect at a moderate effect size (Cohen's d = -0.52; 95% CI: -0.78, -0.27; p = 0.012). For cognitive impairment, the effect was also moderate and significant (Cohen's d = -0.53; 95% CI: 0.09, 0.97; p = 0.02). These findings suggest potential benefit in two domains that are often treatment-resistant.

The authors note that the results argue for definitive multicenter studies of adjunctive 5-HTR antagonists in schizophrenia. The meta-analysis did not report adverse events, discontinuations, or tolerability, so the safety profile remains unclear. Limitations were not reported, and the certainty of evidence was not assessed.

Clinicians should interpret these results cautiously. The moderate effect sizes are promising, but the lack of safety data and the call for further research mean that routine use is not yet supported.

How this fits prior evidence

This meta-analysis extends prior genetic findings in schizophrenia by focusing on a specific pharmacological target. Previous coverage identified 818 consensus loci and distinct biological pathways in schizophrenia, and this meta-analysis suggests that modulating the 5-HTR system may address negative and cognitive symptoms. It also complements the finding that schizophrenia genetic risk is detectable in cord blood DNAm, reinforcing the biological basis of the disorder. However, the moderate effect sizes and lack of safety data mean these results are preliminary and require confirmation in larger trials.

Living with schizophrenia often involves more than just active symptoms. Many people struggle with cognitive impairment, which affects memory and thinking, along with negative symptoms like a lack of motivation or emotional expression. These challenges can make daily life and social connection much harder.

A review of data from 730 patients found that certain medications, known as 5-HTR antagonists, showed a moderate effect in improving these specific areas. These medications included setrons, CVN058, and vortioxetine. The results showed that these drugs performed significantly better than a placebo when treating both cognitive issues and negative symptoms.

While these results are encouraging, the findings come from a meta-analysis, which combines data from several studies. Because the evidence is still developing, experts say we need more large, multi-center studies to confirm these results. For now, these findings suggest that these specific medications could be a helpful addition to current treatment plans.

What this means for you:
Specific medications may help improve cognitive function and negative symptoms in people with schizophrenia.

Common questions

What symptoms can these new medications help with?

The study looked at two main areas: negative symptoms and cognitive impairment associated with schizophrenia. The results showed that the active drugs performed significantly better than a placebo in improving both of these areas for the patients involved.

Which specific medications were studied?

The research looked at a group of medications called 5-HTR antagonists. This group included specific medications known as setrons, CVN058, and vortioxetine. These were compared against a placebo to see how well they worked.

Is this a proven treatment for everyone with schizophrenia?

The results are promising, but the study is a meta-analysis of 730 patients. Because the evidence is still being gathered, experts say more large, multi-center studies are needed to confirm these results before they can be used as a standard treatment.

Study Details

Study typeMeta analysis
Sample sizen = 730
EvidenceLevel 1
PublishedSep 2026
View Original Abstract ↓
While both dopamine type 2 receptor antagonists and the muscarinic MR M/MR agonist xanomeline (KarXT) have shown to be effective in treating positive and total symptoms of schizophrenia, full or partial treatment resistance is common, particularly for negative symptoms and cognitive impairment associated with schizophrenia (CIAS). Based on the concept of targeting excitatory-inhibitory (E/I)-imbalance, serotonin type 3 receptor (5-HTR) antagonists may have utility as an adjunctive treatment for residual symptoms in schizophrenia. We present a meta-analysis of 5-HTR antagonists (setrons, CVN058 and the antidepressant vortioxetine) for CIAS and negative, positive and total symptoms. 12 active- vs. placebo-arm comparisons across 730 participants met the inclusion criteria. Meta-analyses of both negative symptoms [Cohen's d = -0.52 (95%CI: -0.78, -0.27), p = 0.012] and CIAS [Cohen's d = -0.53 (95%CI: 0.09, 0.97), p = 0.02] support a significantly greater effect for active drug at a moderate effect size. The results support the potential utility not only of "setron" type 5-HTR antagonists, but also of vortioxetine, which has significant 5-HTR antagonist properties along with more general anti-depressant features. Results argue for definitive multicenter studies of adjunctive 5-HTR antagonists in schizophrenia.
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