Cabergoline Treat high concentration of the hormone prolactin in the blood is known as hyperprolactinemia. During breastfeeding, the pituitary gland releases the hormone prolactin, which primarily boosts milk production. Among the many health issues that may arise from an abnormal rise in prolactin levels are menstrual cycle abnormalities, infertility, and erectile dysfunction. Cabergoline eliminates these issues by regulating prolactin levels.