Pepto-Bismol: Side Effects, Benefits, Dosage - Verywell Health Mar 21, 2023 · The scientific name for the active ingredient in Pepto-Bismol is bismuth subsalicylate. Bismuth is a mineral that has antibacterial, antacid, and antidiarrheal effects. Subsalicylate is a medication in the same class as aspirin. The active ingredients of Pepto-Bismol are thought to have the following actions within the body: