The FDA-approved dopaminergic medication cabergoline (Dostinex®) is a potent D2R agonist (Ki=0.7) that is used in the treatment of high prolactin levels [64], Parkinson’s disease [65], ovarian hyperstimulation syndrome [66], Cushing’s disease [67], and restless legs syndrome [68]. This evidence concerns the gene DRD2 and restless legs syndrome.