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6. Bismuth

Bismuth subsalicylate, an ingredient in over-the-counter medications like Pepto-Bismol, can temporarily turn stool black. This happens when the bismuth combines with sulfur in the digestive tract, creating a harmless dark compound. While this discoloration is not dangerous, it can be alarming if unexpected. If black stool persists after stopping the medication—or if other symptoms develop—it’s best to consult a doctor.

Top view of sour stomach and anti-diarrhea medicine on a metal spoon atop a white background

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Disclaimer

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.