Why Is My Poop Black?

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By shirley
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Reviewed: dr. stavarache
Article Sources Article Sources
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Medical Expert Medical Expert

2. Bismuth Subsalicylate and Black Poop

Bismuth subsalicylate is a medication that treats diarrhea, heartburn and stomach upset in people over age 12. It reduces intestinal inflammation, decreases the amount of fluids and electrolytes entering the intestines and may destroy diarrhea-causing microbes.

As one of its side effects, bismuth subsalicylate may cause black stools and a darkened tongue. These effects are benign and usually disappear when the person stops taking the medication. Other possible side effects include ringing in the ears and inaccurate urine sugar tests.4‘Bismuth Subsalicylate: MedlinePlus Drug Information.’ MedlinePlus, U.S. National Library of Medicine, medlineplus.gov/druginfo/meds/a607040.html.5‘Bismuth Subsalicylate (Oral Route) Side Effects.’ Mayo Clinic, Mayo Foundation for Medical Education and Research, 1 Feb. 2021, www.mayoclinic.org/drugs-supplements/bismuth-subsalicylate-oral-route/side-effects/drg-20068521?p=1.

Black Stool

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