Antidiarrheals are medications used to treat diarrhea, a condition characterized by frequent, loose, or watery bowel movements. They work by slowing down the movement in the gut, which helps reduce the number of bowel movements and makes the stool less watery. Common types of antidiarrheals include loperamide and bismuth subsalicylate. These medications can be helpful for managing symptoms caused by various factors, such as food intolerances, infections, or irritable bowel syndrome. However, it's important to consult a healthcare professional before using antidiarrheals, especially if diarrhea is severe or accompanied by other symptoms like fever or dehydration.