Pepto Bismol is an over-the-counter medication used to treat symptoms of indigestion, heartburn, nausea, and diarrhea. It contains bismuth subsalicylate, which helps to coat the stomach lining and reduce irritation. Pepto Bismol is available in liquid form or chewable tablets and is commonly used to provide relief from gastrointestinal discomfort. It is important to follow the recommended dosage instructions and consult a healthcare professional if symptoms persist or worsen.