Antigas / antidiarrheal combinations are used to treat diarrhea, gas, and bloating. These medications work by slowing down the movement of your intestines to reduce diarrhea and by breaking up gas bubbles to relieve bloating and discomfort. They are usually available in oral forms, such as tablets and capsules. An example includes loperamide / simethicone (Imodium Multi-Symptom Relief). Your prescriber can help you choose the form that best fits your needs.