› Available in drugstores either by itself or in combination with other medications to treat cold and allergy symptoms.
› Available as a liquid and a tablet.
› Some products relieve cough for up to 12 hours.
Downsides and risks
› Can't take dextromethorphan if you're taking MAO inhibitors (drugs used to treat Parkinson's disease, depression, and other emotional conditions). If taken together, they will cause dangerously high blood pressure levels.
› If you're taking this in combination with other cold and allergy medications, you should read labels closely to make sure you're not accidentally taking too much of a single ingredient.
Tips from our pharmacists for people taking the medication
› Cough suppressant starts working in 15 to 30 minutes.
› Follow age-specific dosing instructions on how much to take. Don't take more than the recommended dose.
› If your cough lasts more than 7 days, call your doctor.