does pepto bismol turn stool black
It turns out that the active ingredient in Pepto-Bismol (bismuth subsalicylate) contains a chemical called bismuth. When a small amount of bismuth combines with trace amounts of sulfur, a black-colored substance (bismuth sulfide) is formed.
SIDE EFFECTS: Dark brown or black stools are common with use of bismuth subsalicylate. Tongue discoloration and constipation also may occur. Other side effects associated with bismuth subsalicylate include: 1  anxiety, 2  confusion, 3  depression, 4  headache, 5  slurred speech, 6  muscle spasms,