The term gastroparesis refers to stomach paralysis. It is a functional condition that affects the muscles and nerves in the stomach. It leads to weaker and slower stomach muscular contractions, which are necessary for the digestion and passage of digested food through the intestines. As a result, food stays in the stomach for a long time. Thus, gastroparesis drugs, which include metoclopramide (Reglan), erythromycin, and others, are used to treat gastroparesis.