# Gender-stratified 9-month comparison of paliperidone extended-release tablets and paliperidone palmitate injection in schizophrenia

## TL;DR

This study compares the effectiveness of two forms of paliperidone in treating schizophrenia in men and women over nine months.

## Contribution

The study provides gender-stratified insights into the long-term efficacy of paliperidone formulations for schizophrenia.

## Key findings

- Paliperidone palmitate injection showed greater efficacy in males compared to extended-release tablets.
- No significant differences were found between formulations in females.
- Both formulations had comparable tolerability across genders.

## Abstract

Gender differences in antipsychotic efficacy for schizophrenia (SCZ) remain understudied despite evidence of sex-dependent pharmacokinetic, neurobiological, and social factors influencing outcomes. This trial compared 9 - month efficacy and tolerability of paliperidone palmitate injection 1-monthly (PP1M) versus extended-release tablets in male and female patients with SCZ, with a focus on gender-stratified results.

This randomized, open-label study enrolled 118 adult patients (61 males, 57 females) diagnosed with SCZ. Participants were randomized (1:1) to receive either paliperidone extended-release (ER) tablets (titrated 3–12 mg/day) or PP1M (3–9 mg monthly). Efficacy was assessed via PANSS total scores and CGI-S severity ratings at 3, 6, and 9 months. Safety was evaluated using the TESS scale.

Gender-stratified analysis revealed superior long-term efficacy for males treated with paliperidone palmitate injection. Males treated with PP1M demonstrated significantly greater reductions in PANSS scores (mean difference at 9 months: -7.44; p < 0.05) and CGI-S severity compared to ER therapy. Females showed no statistically significant differences between formulations at any time point, with overlapping confidence intervals (e.g., PANSS mean difference at 9 months: +3.16; p > 0.05). Both groups exhibited comparable tolerability, with minimal adverse events.

Gender-informed treatment strategies are critical in SCZ management. PP1M appears advantageous for males seeking long-term symptom stabilization, while treatment selection for females may prioritize lifestyle factors. These findings underscore the need for sex-stratified analysis in antipsychotic trials and the importance of tailored interventions to address sex-based disparities in psychiatric care.