The aim of investigation was the study of efficiency of the renin-angiotensin system blocker captopril usage in order to correct renal dysfunction on the background of hyperthyrosis created experimentally by the thyroxin administration. It’s established that captopril has a good influence on the morphofunctional state of hyperthyroid kidney decreasing dystrophic degeneration, necrosis and vascular changes, correcting the decrease of creatinine clearance and increase of the renal loss of the osmotically active substances and proteins. It’s also revealed that captopril raises diuresis and lowers the excretion of active substances under condition of its previous administration and increases creatinine clearance and weakens proteinuria under condition of its administration during 24 hrs after thyroxin.
