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Clozapine (CLZ) is considered the most effective drug in treatment of resistant schizophrenia. However, its cardiotoxic effect has raised concerns about its safety. Captopril is a well-known angiotensin-converting enzyme inhibitor with unique antioxidant properties. The aim of this study was to investigate the protective effect of captopril against CLZ-induced myocarditis, and since both drugs have hematotoxic effects, this study aimed to clarify the effect of their combined use on the bone marrow. The study was conducted for 4 weeks on 50 adult male albino rats divided into five groups: group I (negative control), group II (positive control), group III treated with captopril 5 mg/kg/day, group IV treated with CLZ 25 mg/kg/day, and group V treated with captopril (5 mg/kg) 1 hour before CLZ (25 mg/kg/day). CLZ group showed a significant increase in serum troponin I, marked histopathological changes, and immunohistochemical staining of DNA degradation product 8-hydroxy-2-deoxy guanosine (8-OHdG). It significantly increased malondialdehyde level and decreased glutathione peroxidase. Captopril coadministration decreased the histopathological hallmarks and biochemical marker of myocarditis and attenuated CLZ effects on the oxidative stress parameters and 8-OHdG, suggesting its protective action against CLZ-induced myocarditis. Complete blood count and bone marrow evaluation was normal indicating that captopril, in the protective dose given, didn’t increase the risk of CLZ-induced hematotoxicity

Evaluation of the role of captopril on clozapine-induced cardiotoxicity and hematotoxicity in adult male albino rats