Drug Interaction Checker

Tobacco smoking may reduce the effectiveness of this drug in treating your condition; Tobacco smoke contains substances that speed the removal of this drug from the body. Alternatively, if you take this drug and suddenly stop Tobacco smoking, you may feel more drowsy or tired, or may experience confusion, dizziness, difficulty in movement or other side effects. If you will stop smoking, use care in driving or operating machinery until you know how this drug will affect you. Make sure your prescriber is aware that you smoke Tobacco or if you plan to stop smoking. Report any unusual side effects promptly.

Grapefruit juice may increase the actions of Dextromethorphan. Side effects from the Dextromethorphan may get worse if you drink grapefruit juice. It may be best to avoid drinking grapefruit juice while you are taking Dextromethorphan.