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Pepto-Bismol - How long will your stool be dark for?

Medically reviewed by Last updated on Oct 12, 2022.

Took about 3 doses on Thursday and 1 dose on Friday and it's Monday and my stool is still black?

Official answer


Dark colored / black stools are a common side effect and can last for several days after you stop taking Pepto-Bismol. This is not a serious side effect.
Give it a few more days and it should disappear.

Dark colored bowel motions can also be a sign of gastrointestinal bleeding so if it continues or you are concerned please see your Doctor.


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