Safeguard Your Medicine & Know What is in Your Cabinet: Over 100 OTC Products Contain DXM Below is a list of popular brand-name over-the-counter (OTC) cough, cold, and u medicines that contain the active ingredient dextromethorphan (DXM), which is the most widely used cough suppressant ingredient in the United States. While millions of Americans rely on OTC medicines containing DXM for cough relief, some teens ignore labeling instructions and intentionally […]