Dextromethorphan is a generic, over-the-counter (OTC) drug used to help relieve cough. The medication is also available as the brand-name drug Delsym. Dextromethorphan belongs to the antitussive drug ...

Dextromethorphan is an over-the-counter (OTC) drug that helps relieve a dry cough from a short-term cause, such as the common cold. Dextromethorphan works in the brain by reducing the urge to cough ...

Dextromethorphan can cause side effects that range from mild to serious. More common side effects include nausea and drowsiness. If dextromethorphan side effects become difficult to tolerate, talk ...