Imodium A-D Caplets control diarrhea symptoms, including Traveler's Diarrhea. Each caplet contains 2 milligrams of loperamide hydrochloride to help you feel better fast. Doctor recommended, Imodium A-D works faster than the leading prescription antidiarrheal medication (diphenoxylate and atropine). This proven formula works with your body to slow down your system and restore its natural rhythm and balance.