Pepto-Bismol
Bismuth subsalicylate, sold generically as pink bismuth and under the brand names Pepto-Bismol and BisBacter, is an antacid medication used to treat temporary discomforts of the stomach and gastrointestinal tract, such as nausea, heartburn, indigestion, upset stomach, and diarrhea.
So for the 5 year old explanation, it is medicine that coats your stomach to protect it against spicy foods and other bad things.
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