Dextromethorphan/Phenylephrine-containing Syrup

**Semantic type:** Pharmacologic Substance

**Definition:** A syrup-based formulation containing the antitussive dextromethorphan hydrobromide and the decongestant phenylephrine hydrochloride. Dextromethorphan exerts its antitussive activity by raising the threshold for coughing in the cough center. Phenylephrine, a sympathomimetic agent, acts as a decongestant by inducing vasoconstriction mediated via alpha-adrenergic receptors. This reduces blood flow, decreases swelling and prevents nasal and sinus congestion.

**Synonyms:** - Triaminic Daytime Cold and Cough