does dextromethorphan cause drowsiness
Comtrex Cold and Cough Non-Drowsy Â® (as a combination product containing Acetaminophen, Dextromethorphan, Phenylephrine ... Dextromethorphan may cause side effects. ... dizziness; lightheadedness; drowsiness; nervousness; restlessness; nausea; vomiting; stomach pain.