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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Black Stool After Taking Bismuth?

I had stomach cramps and diarrhea and took a liquid bismuth for 2 days. I had black stool for 3 days and then regular color stool yesterday. But when I got up this morning my stool was black again, 3 days after i stopped taking the bismuth. Is this normal? I am really scared ...
Sat, 7 Jul 2018
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General & Family Physician,  's  Response
Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.

Suggestive of bleeding from the intestinal tract.

One of the common side effects of bismuth is black discoloration of the tongue and the stool which usually subside upon discontinuing the treatment.

Since you have black stool even after stopping liquid bismuth, the possibility of bleeding from the stomach or intestine must be ruled out after consulting your doctor.

Hope I could answer your query.

Hope I have answered your query. Let me know if I can assist you further.
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What Causes Black Stool After Taking Bismuth?

Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Suggestive of bleeding from the intestinal tract. One of the common side effects of bismuth is black discoloration of the tongue and the stool which usually subside upon discontinuing the treatment. Since you have black stool even after stopping liquid bismuth, the possibility of bleeding from the stomach or intestine must be ruled out after consulting your doctor. Hope I could answer your query. Hope I have answered your query. Let me know if I can assist you further.