# Evaluation of Prescription Patterns of Antipsychotics in Schizophrenia Patients—A Single-Center Prospective Study

## TL;DR

This study examines how inappropriate antipsychotic prescriptions and polypharmacy affect the safety of schizophrenia patients.

## Contribution

The study identifies specific prescription patterns linked to increased side effects in schizophrenia patients.

## Key findings

- Polypharmacy was found in 52% of patients and was associated with higher side effect scores.
- First-generation antipsychotics and combinations with haloperidol or olanzapine increased side effect risk.
- Following evidence-based guidelines is crucial for safer treatment of schizophrenia patients.

## Abstract

Inappropriate prescription patterns and polypharmacy are critical challenges facing the optimal management of schizophrenia patients, especially in regard to patient safety. Background/Objectives: The purpose of this study was to examine the relationship between patient safety and the existence of incorrect prescription patterns and/or polypharmacy in the medications prescribed to individuals with schizophrenia. This issue is addressed in a broad context, highlighting the purpose of this study. Methods: A cross-sectional study was adopted, involving a prospective analysis of the prescriptions of schizophrenia patients receiving treatment. Prescription patterns deemed inappropriate were evaluated based on evidence-based guidelines. Antipsychotic maximum allowable daily doses were calculated using the British National Formulary Maximum Daily Dose (BNFmax), an online tool. Patient safety outcomes were assessed using the Glasgow Antipsychotic Side-effect Scale (GASS). Results: A total of 198 patients diagnosed with schizophrenia and receiving treatment consented to participate in the GASS survey. A total of 116 (58.6%) males participated. The mean age of patients was 40.1 (±12.7). Thirty-one (66.2%) reported mild side effects, while 67 (33.8%) reported moderate side effects. Polypharmacy was detected in 103 (52%) patients’ prescriptions. The correlation between GASS and BNFmax was positive and statistically significant (p < 0.001). The elevation in GASS score was associated with polypharmacy prescriptions (OR 3.21; 95% CI 1.64–6.29), the presence of first-generation antipsychotics (FGAP) (OR 2.79; 95% CI 0.236–5.951), any combination of antipsychotics containing haloperidol (OR 3.22; 95% CI 1.11–9.32), and olanzapine (OR 3.46; 95% CI 1.36–8.79). Conclusions: The safety of patients with schizophrenia has been proven to be impacted by the improper use of psychotropic drugs. Following evidence-based guidelines is a cornerstone to ensuring optimal, effective, and safe patient treatment plans.