The original upset stomach and diarrhea reliever. Relieve heartburn, indigestion, nausea, upset stomach, and diarrhea with the smooth original liquid formula that comes with just a hint of a fresh wintergreen taste. Use as directed. Bismuth Subsalicylate. Upset Stomach Reliever Antidiarreheal. Whether you?re looking for relief in liquid, chewables, or caplets Pepto-Bismol has you covered. With five-symptom digestive relief, it?s no wonder that we?re the No. 1 pharmacist-recommended brand for relief of upset stomach due to overindulgence in food and drink.