Treatment With Indapamide in Patients With Post-Surgical Hypoparathyroidism

Inclusion Criteria: 1. Chronic post surgical hypoparathyroidism diagnosed \> 1 year ago 2. Age ≥ 18 years 3. Require treatment with active vitamin D ≥ 1 µg/day 4. Ionized plasma calcium between 1.15-1.25 mmol/L 5. 25(OH)D vitamin ≥ 50 nmol/L 6. Plasma magnesium \> 0.65 mmol/L 7. Able to read and understand Danish 8. Willing and able to sign the informed consent form Exclusion Criteria: 1. Estimated glomerular filtration rate (eGFR) \< 30 ml/min/1.73 m3 2. Active cancer or former (except thyroid and basal cell skin) cancer treatment \< 1 year ago 3. Pregnancy, pregnancy plans, or breastfeeding \< 1 year ago 4. Abnormal arterial pressure at time of screening defined as symptomatic hypotension or systolic blood pressure \< 100 mmHg 5. Plasma potassium \< 3.5 mmol/L 6. Any current disease that might affect the calcium metabolism such as but not limited to: 1. Recent prolonged immobility 2. Untreated diabetes (HbA1c \> 53 mmol/mol) 3. Severe liver disease or hepatic encephalopathy 4. Untreated thyroid disease 7. Current disease that might affect gastrointestinal absorption 8. Use of medications such as lithium or diuretics within 4 weeks prior to start of treatment 9. Known allergy or sensitivity to Indapamide, its excipients or sulfonamides 10. Known galactosemia, lactase deficiency, or glucose-galactose malabsorption