Dextromethorphan can cause side effects that range from mild to serious. More common side effects include nausea and drowsiness. If dextromethorphan side effects become difficult to tolerate, talk ...
Dextromethorphan is a generic over-the-counter (OTC) drug used to relieve cough. The drug comes as an oral suspension and an oral liquid capsule. How often you take it depends on the form you take.
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