The present study investigates the extrapyramidal effects of co-administration of enalapril (angiotensin-converting enzyme inhibitor) or losartan (angiotensin receptor blocker) with haloperidol in mice. Enalapril/losartan (as a suspension in 1% gum acacia) was administered by oral gavage and haloperidol was administered as an intraperitoneal injection to all the animals for seven days. Catalepsy was measured 30 min after the administration of haloperidol (1 mg/kg i.
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