- di·phen·hy·dra·mine .dī-.fen-'hī-drə-.mēn n an antihistamine used esp. in the form of its hydrochloride C17H21NO·HCl to treat allergy symptoms and motion sickness and to induce sleep see BENADRYL
* * *n.an antihistamine with sedative properties used to induce sleep and - in combination with other drugs - included in cough mixtures (e.g. Benylin). It is administered by mouth; side-effects include drowsiness.
* * *di·phen·hy·dra·mine (di″fen-hiґdrə-mēn) a potent antihistamine (H1 receptor antagonist) with anticholinergic, antitussive, antiemetic, antivertigo, antidyskinetic, and sedative actions.
Medical dictionary. 2011.
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