Can certain medicines cause dark stools?

Yes, certain medicines can cause dark stools. Medications such as iron supplements and bismuth subsalicylate (found in Pepto-Bismol) can lead to darker stool coloration. Additionally, some antibiotics and medications that affect gastrointestinal function may also contribute to changes in stool color. If dark stools occur, it's important to consult a healthcare professional to rule out any serious conditions.