Frusenex is a drug from the group of loop diuretics. Frusenex blocks the reabsorption of sodium and chlorine ions in the proximal and distal regions of the renal tubules, as well as in the thick segment of the ascending part of the Gentle loop. Furosemide has a pronounced diuretic, natriuretic and chloruretic action. Due to the increased excretion of sodium ions, there is a secondary enhanced excretion of water and an increase in the secretion of potassium ions in the distal part of the renal tubule, and the excretion of calcium and magnesium ions also increases. The drug has an antihypertensive effect due to increased excretion of sodium chloride and a decrease in the reaction of vascular smooth muscle on vasoconstrictor effects, as well as a result of a decrease in circulating blood volume. Frusenex refers to diuretic drugs.