why does pepto bismol cause black stool
Have you ever had stomach upset and then taken some Pepto-Bismol or Kaopectate? Maybe you felt better, but that day or the day after, something really weird happened. The next time you had a bowel movement, your stool was black or even maybe it was even green. Taking these medications can have this effect. It is caused by the active ingredient - bismuth subsalicylate.