| Noun | 1. | antihistamine - a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor siteActifed - trade name for a drug containing an antihistamine and a decongestant; used to treat upper respiratory conditions and minor allergies brompheniramine maleate, Dimetane - antihistamine (trade name Dimetane) used to treat hypersensitivity reactions (as rhinitis) chlorpheniramine maleate, Chlor-Trimeton, Coricidin - an antihistamine (trade names Coricidin and Chlor-Trimeton) cyproheptadine, Periactin - an antihistamine (trade name Periactin) used to treat some allergic reactions dimenhydrinate, Dramamine - antihistamine and antiemetic (trade name Dramamine) used to treat motion sickness Dimetapp - trade name for a drug containing an antihistamine and a decongestant; used to relieve nasal congestion and to treat rhinitis Benadryl, diphenhydramine - antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness Antivert, meclizine, meclizine hydrochloride - an antihistamine (trade name Antivert) used to treat or prevent motion sickness medicament, medication, medicinal drug, medicine - (medicine) something that treats or prevents or alleviates the symptoms of disease methapyrilene - antihistamine used to treat allergic responses (as rhinitis or dermatitis or pruritus) pheniramine - an antihistamine used in preparations to treat allergies and respiratory infections; used to treat rhinitis and skin rashes and pruritus phenyltoloxamine - antihistamine included in some preparations used to treat coughing and nasal congestion Phenergan, promethazine - antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sickness pyrilamine - antihistamine used to treat rhinitis and pruritus |