Mechanism of Action
Chlorpheniramine competes with histamine for H1-receptor sites on effector cells in the gastrointestinal tract, blood vessels, and respiratory tract. Dexchlorpheniramine is the predominant active isomer of chlorpheniramine and is approximately twice as active as the racemic compound.
Mechanism of Action
Brompheniramine maleate is an antihistamine with H1-receptor activity; pseudoephedrine, a sympathomimetic amine and isomer of ephedrine, acts as a decongestant in respiratory tract mucous membranes with less vasoconstrictor action than ephedrine in normotensive individuals; dextromethorphan, a non-narcotic antitussive, increases cough threshold by its activity on the medulla oblongata.
Mechanism of ActionChlorpheniramine competes with histamine for H1-receptor sites on effector cells in the gastrointestinal tract, blood vessels, and respiratory tract. Dexchlorpheniramine is the predominant active isomer of chlorpheniramine and is approximately twice as active as the racemic compound.Mechanism of ActionBrompheniramine maleate is an antihistamine with H1-receptor activity; pseudoephedrine, a sympathomimetic amine and isomer of ephedrine, acts as a decongestant in respiratory tract mucous membranes with less vasoconstrictor action than ephedrine in normotensive individuals; dextromethorphan, a non-narcotic antitussive, increases cough threshold by its activity on the medulla oblongata.
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