The Children's Medical Center of the University of Virginia provides another multimedia site to help parents learn more about the digestive tract. This section covers bowel movements in children and problems with constipation and bowel incontinence. Sections on management provide an excellent overview of treatment strategies.
Here's a clear discussion, of four types of commonly prescribed medications used to increase the movement of food through the digestive tract. The mode of action is provided for dopamine antagonists, motilin antagonists, 5hydroxytryptamine antagonists, and somatostatin.