Domperidone is given in order to relieve nausea and vomiting; to increase the transit of food through the stomach (as a pro kinetic agent through increase in gastrointestinal peristalsis).
Domperidone is used to increase lactation (breast milk production) by release of pro lactin.
It is also used in the scientific study of the way dopamine (an important neurotransmitter) acts in the body.