Guaifenesin-DM NR Liquid (Guaifenesin / Dextromethorphan Hydrobromide) - Side Effects and Adverse Reactions

ADVERSE REACTIONS

Guaifenesin is well tolerated and has a wide margin of safety. Nausea and vomiting are the side effects that occur most commonly. Other reported adverse reactions have included dizziness, headache and rash (including urticaria). Rare drowsiness or mild gastrointestinal disturbances are the only side effects associated with  extromethorphan in clinical use. (see also Drug Interactions)