Dose range: 100 to 450 mg/day. IV route: three doses of 5 mg Metoprolol administered at intervals of 2 minutes time. Oral route: if the patient gives no sign of complication from the IV route, a total of 15 mg, then a tablet of 50 mg in 6 hour block should start immediately after the IV dose.
â¢ ANTIHISTAMINE (noun) The noun ANTIHISTAMINE has 1 sense: 1. a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site. Familiarity information: ANTIHISTAMINE used as a noun is very rare.
antihistamine. Any substance that reduces the effect of histamine or blocks histamine receptors, usually the histamine 1 (H1) receptor. It is used in the treatment of allergic conjunctivitis and also in the temporary relief of minor allergic symptoms of the eye. Common agents include antazoline sulfate, azelastine hydrochloride, cetirizine, chlorphenamine, emedastine, epinastine hydrochloride, ketotifen, levocabastine, loratadine and olopatadine.