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Dextromethorphan and Quinidine Side Effects

Common Side Effects

Dextromethorphan and quinidine has been studied extensively in clinical trials. In these studies, one group of people received the real medication, while another group was given a placebo (a "sugar pill" that does not contain any active ingredients). As a result, it was possible to see what side effects occurred, how often they appeared, and how they compared to the placebo.
In these studies, the most commonly reported dextromethorphan and quinidine side effects included:
  • Diarrhea -- in up to 13 percent of people
  • Dizziness -- up to 10 percent
  • Coughing -- up to 5 percent
  • Vomiting -- up to 5 percent
  • Weakness -- up to 5 percent
  • Swelling of the legs, ankles, or feet -- up to 5 percent
  • Urinary tract infection (UTI) -- up to 4 percent
  • Flu -- up to 4 percent
  • Elevated liver enzymes -- up to 3 percent
  • Gassiness -- up to 3 percent.

Final Thoughts

You may experience some or none of the side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have problems with a medicine that you have never tried.
Therefore, make sure to let your healthcare provider know if you develop any side effects while taking dextromethorphan and quinidine or if something "just does not seem right." While it may not be related to the medication, your healthcare provider will be able to diagnose and treat the problem.
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Dextromethorphan and Quinidine Information

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