Drug that mimics the actions of the naturally occurring biochemical substance dopamine, a neurotransmitter. Bromocriptine acts on the pituitary gland to inhibit the release of prolactin, the hormone that regulates lactation, and thus reduces or suppresses milk production. It is also used in the treatment of Parkinson's disease.
Bromocriptine may also be given to control excessive prolactin secretion and to treat prolactinoma (a hormone-producing tumor). Recent research has established its effectiveness in reversing some cases of infertility.