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 works by blocking the effects of histamine, a protein released during an allergic reaction.This antihistamine reduces the rate at which histamine is produced.An antihistamine is any drug that neutralizes the effects of histamine, or inhibits its production in the body. Antihistamines are used in the treatment of allergies.