what should i do if i have dirrhea with black tar-like stools with horrible odor? . i know that pepto can darken stools but i had just taken it about 5 minutes before the first black stool.
pepto bismol can cause the stools to be darker but not black and tarry and not likely five minutes after you took it. this may be a sign of a gastrointestinal bleed especially the stomach. i would strongly suggest that you see or consult your medical provider as soon as possible.