A member asked:

Can the diabetic drug metformin suddenly start causing diarrhea after being on it for a year?

11 doctors weighed in across 2 answers
Dr. Robert Lang answered

Specializes in Internal Medicine - Endocrinology

Yes: This is unlikely, but possible if you are taking the same preparation. However, different manufacturers products can have different effects in different people, check with you pharmacist to see if you have been on the same product.

Answered 12/16/2014

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Unlikely: Anything is possible, but this is unlikely and before stopping your metformin you should be evaluated for other possible causes of the diarrhea. If none are found, then changing your medication may be a reasonable option.

Answered 6/23/2012

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