why does your tongue turn black after you take the chewable pepto bismal tablets?

Question

if you take one at night, the next morning your tongue will be black

Answer 1

It's the antacid in it. It reacts through Ur whole body, U just see it on Ur tongue. Hope this helps U

Answer 2

Bismuth subsalicylate, the active ingredient, can cause black tongue and black stools when it reacts with sulfur in saliva or in the gastrointestinal tract. It lasts a few days at most and and is harmless.