EFFECTS OF VERAPAMIL ON ELECTROCONVULSIVE SHOCK-INDUCED AND CLONIDINE-INDUCED AMNESIA

The effect of the Ca2+ blocker verapamil on amnesia induced by electro convulsive shock (ECS) or by the alpha-adrenoceptor agonist clonidine was studied in male Wistar rats trained in passive avoidance task (''s tep down''). Clonidine (0.1 mg/kg, i.p.) and ECS induced a pronounced amnesia, significantly reducing the percentage of rats that had acquir ed the task upon retention tests, given 3 h, 24 h and 7 days after tra ining. Verapamil (10 mg/kg) administered orally for 12 days (5 days be fore and 7 days after training) completely abolished the ECS- or cloni dine-induced amnesia. These data suggest that calcium channel blocker verapamil has a protective effect against experimentally provoked memo ry deficit and might be useful for the treatment of cognitive disorder s.