no question... guaifenesen, a component of Mucinex and Delsym will cause diarrhea.There should be a warning on the product, it builds up when you first take it for bronchitis e.g., then diarrhea occurs within an hour or two. It's confusing because one thinks it's due to the original virus, but my research says no, it's the guaifenesen.
RN retired.
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Re: MUCINEX Side Effects
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