Antidiarrheal medications are used to treat diarrhea, a condition characterized by frequent, loose, or watery bowel movements. These medications work by slowing down the movement in the gut, allowing for more water to be absorbed from the stool, which helps to reduce the frequency of bowel movements. Common types of antidiarrheals include loperamide and bismuth subsalicylate. While antidiarrheals can provide relief, they are not suitable for all types of diarrhea, especially if caused by infections or certain medical conditions. It's important to consult a healthcare professional before using these medications, particularly in cases of severe symptoms or prolonged diarrhea.