Description cabergoline, an ergot derivative, is a long-acting dopamine agonist and prolactin inhibitor. it is used to treat hyperprolactinemic disorders and parkinsonian syndrome. cabergoline possesses potent agonist activity on dopamine d2 receptors.indication for the treatment of hyperprolactinemic disorders, either idiopathic or due to prolactinoma (prolactin-secreting adenomas). may also be used to manage symptoms of parkinsonian syndrome as monotherapy during initial symptomatic management or as an adjunct to levodopa therapy during advanced stages of disease.mechanism of action the dopamine d2 receptor is a 7-transmembrane g-protein coupled receptor associated with gi proteins. in lactotrophs, stimulation of dopamine d2 causes inhibition of adenylyl cyclase, which decreases intracellular camp concentrations and blocks ip3-dependent release of ca2+ from intracellular stores. decreases in intracellular calcium levels may also be brought about via inhibition of calcium