Drexophed SR Information

What's inside Drexophed SR

Drexophed SR Chemical Information

dexbrompheniramine maleate - The maleate salt form of dexbrompheniramine, an alkylamine derivative with anticholinergic and sedative properties. Dexbrompheniramine is a histamine H1-receptor antagonist that competes with histamine for the H1-receptor sites on effector cells in the gastrointestinal tract, blood vessels and respiratory tract. The antagonistic action of this agent blocks the activities of endogenous histamine, which subsequently leads to temporary relief from the negative histamine-mediated symptoms of allergic reaction such as bronchoconstriction, vasodilation, increased capillary permeability and spasmodic contractions of gastrointestinal smooth muscle.

pseudoephedrine sulfate - The sulfate salt form of pseudoephedrine, a phenethylamine and a diastereomer of ephedrine with sympathomimetic property. Pseudoephedrine sulfate displaces norepinephrine from storage vesicles in presynaptic neurones, thereby releasing norepinephrine into the neuronal synapses where it stimulates primarily alpha-adrenergic receptors. It also has weak direct agonist activity at alpha- and beta- adrenergic receptors. Receptor stimulation results in vasoconstriction and decreases nasal and sinus congestion.