Dextromethophan Dextromethorphan Hydrobromide Dextromethorphan Polistirex
MajorDextromethorphan Polistirex should not be taken together with phenelzine, an antidepressant. Reports exist of two deaths in patients who took phenelzine with dextromethorphan, even though both were taken at normal doses. Dextromethorphan Polistirex releases dextromethorphan into the body, so it is the same active ingredient as Dextromethorphan Hydrobromide. The same caution therefore applies to Dextromethorphan Hydrobromide.
These medicines can affect each other in a serious way. Do not start taking them together unless your doctor has said it is OK. If you already take both, do not stop either one on your own: speak to your doctor or pharmacist soon.