“Drug antagonist , ex?”,”drug that will cause a reaction not to occur or block a reaction from occurringBenadryl or diphenhydramine HCl

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“Drug antagonist , ex?”,”drug that will cause a reaction not to occur or block a reaction from occurringBenadryl or diphenhydramine HCl

which will block histamine 1 receptor sites from stimulation by the endogenous compound histamine.”