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.
An antihistamine is a type of drug used to fight allergic reactions. It encompasses a broad class of drugs that can treat conditions ranging from minor to life threatening. Different ones are used for different types of reactions, but at their root, all do the same thing â they counteract a type of chemical released by the body's immune system, known as histamine.