Controls the symptoms of diarrhea. Only Imodium A-D Caplets provide effective diarrhea relief in a smaller caplet that is easier to swallow. Imodium A-D Caplets are: The original prescription strength of Imodium A-D in a smaller caplet, for diarrhea relief often in just one dose, in both adults and children 6 years and older. Less than half the size of the original Imodium A-D Caplet, so they are easier to swallow.