For those individuals that experience bouts of gas pain and diarrhea, your doctor may recommend you take Imodium Complete. This dual-action formula contains Loperamide and Simethicone that work together for fast relief. Loperamide works by affecting the nerves in your intestines to reduce the amount of stool you produce and stool frequency as well as makes your stools more firm and decreases painful cramping. Simethicone works in your stomach to change the surface pressure of gas bubbles which allows the small bubbles to join up and make it easier for you to expel it.