Diuretics are very widely used in clinical practice. Diuretics mainly act on the kidneys to promote the excretion of water and electrolytes in the kidneys, thus increasing urine output. According to the different action sites of diuretics and the different diuretic effects, they can be clinically divided into the following categories: 1.Tab diuretics mainly act on the coarse segment of the ascending branch of medullary collaterals, which have strong diuretic effects, and the representative drug is mainly furosemide; 2.Thiazide diuretics, which mainly act on the inner segment of the posterior wall of the ascending branch of medullary collaterals, and their diuretic effects belong to medium-acting diuretics, and the representative drug is hydrochlor The diuretic effect is a medium-acting diuretic, and the representative drug is hydrochlorothiazide; 3, potassium-protecting diuretics, potassium-protecting diuretics mainly act on the distal tubules of the renal tubules and the collecting ducts to reduce the excretion of potassium ions, which has the effect of potassium-protecting diuretics, and the drugs commonly used clinically are spironolactone and aminopterin. Take diuretics must be under the guidance of a doctor.