Actually: Pepto-Bismol
Pepto-Bismol, also known as “bismuth subsalicylate” is an antacid medication used to treat temporary discomfort of the stomach and gastrointestinal tract, such as “nausea, heartburn, indigestion, upset stomach, and diarrhea”, the order of which is used in a lot of their commercials and branding.
Although the history page of Pepto-Bismol describes its name change from “Bismosal”, it doesn’t explain where the “Pepto” comes from. My guess is it has to do with the “peptic” areas of the human body (the stomach and duodenum), which Pepto-Bismol effects. Pepto may be a play on “peptic”.