Description
Bismuth subsalicylate is the main ingredient in Pepto-Bismol. This medicine is used for heartburn and acid reflux, indigestion, diarrhoea and feeling sick (nausea). It works by protecting your stomach and the lower part of your food pipe from stomach acid.
SIDE EFFECTS
You're unlikely to get any side effects from Pepto-Bismol if you follow the instructions for taking it. One common side effect is your poo or your tongue turning black. This is harmless.