Cabergoline is a dopaminergic ergot derivative with potent and long-lasting prolactin-lowering activity. The drug directly stimulates D2 dopamine receptors on the surface of pituitary lactotropic cells, thereby inhibiting prolactin secretion. This substance reduces prolactin secretion in rats when administered orally at a dose of 3-25 μg/kg and in vitro at a concentration of 45 pg/ml. In addition, cabergoline exerts central dopaminergic effects through stimulation of D2 receptors at oral doses exceeding those effective in reducing serum prolactin levels. The long-term effect of Dostinex on reducing prolactin levels is likely due to its long-term persistence in the target organ, as indicated by the slow rate of elimination of total radioactivity from the pituitary gland after a single oral dose in rats (t½ is approximately 60 hours).