What is the amount of antihistimines in bromfed dm syrup?

28 Jul 2011

Bromfed DM Cough Syrup each 5 mL (1 teaspoonful) contains:

Brompheniramine Maleate, USP . . . . . . . . 2 mg
Pseudoephedrine Hydrochloride, USP . . . . . 30 mg
Dextromethorphan Hydrobromide, USP . . . 10 mg

Brompheniramine maleate is a histamine antagonist, specifically an H1-receptor-blocking agent belonging to the alkylamine class of antihistamines. Antihistamines appear to compete with histamine for receptor sites on effector cells. Brompheniramine also has anticholinergic (drying) and sedative effects. Among the antihistaminic effects, it antagonizes the allergic response (vasodilation, increased vascular permeability, increased mucus secretion) of nasal tissue. Brompheniramine is well absorbed from the gastrointestinal tract, with peak plasma concentration after single, oral dose of 4 mg reached in 5 hours; urinary excretion is the major route of elimination, mostly as products of biodegradation; the liver is assumed to be the main site of metabolic transformation.

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