Pepto-Bismol and Tums are two popular over-the-counter (OTC) medications taken to manage heartburn, abdominal pain, bloating, and diarrhea. Pepto-Bismol (bismuth subsalicylate) and Tums (calcium ...

Certain medications, including iron tablets and the indigestion medication bismuth subsalicylate (Pepto-Bismol) may also turn stool black. If someone has recently consumed any of these and their ...