Cabergoline is a dopamine receptor agonist and ergot derivative primarily used to treat hyperprolactinemia, a condition involving elevated prolactin levels from causes like prolactinomas or idiopathic factors. It effectively lowers prolactin by stimulating D2 receptors on pituitary lactotrophs, addressing symptoms such as infertility, menstrual irregularities, and sexual dysfunction in both men and women. Additionally, it serves as adjunctive therapy for acromegaly in cases with mixed growth hormone/prolactin-secreting tumors and may help manage Parkinson's disease symptoms through its dopaminergic effects.