pepto-bismol (or pink bismuth) specifically is known to turn the tongue and/or stool black temporarily. this condition can persist for a few days after you take the product. the effect depends on how much pepto you took too. if the black stool goes away after a few days you probably have nothing to worry about. if it persists for more than a week you probably should see a health care provider. bleeding in the gastrointestinal tract (everything from your stomach to your rectum) can cause the stool to turn black. i'm going to assume however that the situation is temporary due to the use of pink bismuth. wishing you all the best for a speedy recovery!
what causes black poop. i had the stomach flu for 4 days with vomiting and black diarhia i have been better for 2 days however i took pepto bismal for stomach ache yesterday. today i had a bowel movement and it was still liquid and black. could this be just the infection coming out or is it something more?