Metabolic Outcomes in Patients With Prolactinomas Under Dopamine Agonist Treatment

Inclusion Criteria (treatment-naïve patients): * Diagnosed adult patients (at least 18 years of age) with prolactinoma-induced hyperprolactinemia, defined as a prolactin level ≥ two times the local laboratory maximum and radiographic criteria, based on current guidelines. Inclusion Criteria (treatment-naïve patients): * Diagnosed adult patients (at least 18 years of age) with prolactinoma-induced hyperprolactinaemia based on current guidelines. * Patients treated with cabergoline as DA therapy and prolactin levels within the normal range Exclusion Criteria: * alternative explanation for hyperprolactinaemia * Active substance use disorder within the last six months * Current or previous psychotic disorder * Pregnancy or breastfeeding within the last 8 weeks * Severe hepatic insufficiency or cholestasis * Child Pugh C or * AST/ ALT \> 3 x the upper limit of normal ULN or * Cholestasis (total bilirubin \> 2x ULN) * Severe renal impairment (eGFR \< 30 ml/min) * History of pulmonary, pericardial, and/or retroperitoneal fibrotic disorders * Concomitant treatment with strong or moderate CYP3A4 inhibitors * Local complications on morphological imaging, related to signs or clinical symptoms which make surgical intervention necessary or a clear patient's preference for surgical treatment * Gastrointestinal disease or previous surgery: chronic active inflammatory bowel disease, active gastrointestinal ulcer disease, or surgery on the gastrointestinal tract (e.g. sleeve stomach, gastric band) * Patient incapable of giving informed consent due to cognitive impairment or other reasons (e.g., legal incapacity)