A 40-year-old female patient complain of headache, dizziness, muscle weakness, sometimes - cramps in the extremities. She has been taking antihypertensive medications for 10 years. AP- 180/100 mm Hg. Blood potassium -1,8 millimole/l, sodium - 4,8 millimole/l. In urine: alkaline reaction, the relative density -1012, protein and sugar are not found, WBCs - 3-4 in the field of vision, RBCs -12 in the field of vision. Conn's syndrome is suspected. Which drug should be chosen for the treatment of arterial hypertension?