Antagonism by naltrexone of the hypotension and bradycardia induced by alpha-methyldopa in conscious normotensive rats.


The possible role of the endogenous opioid system in the central hypotensive mechanism of action of alpha-methyldopa was investigated. Conscious normotensive Wistar rats were used in this study and all treatments were given intracisternally. Pretreatment with the opiate receptor antagonist naltrexone resulted in a parallel shift to the right of the dose… (More)


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