Diuretics for edema are mainly oral diuretics, or intravenous diuretics, to reduce edema. The most common diuretics are thiazide diuretics, represented by hydrochlorothiazide; medullary diuretics, represented by tachyphylaxis; potassium-preserving diuretics, most commonly known as anisodone, and osmotic diuretics, represented by mannitol. These drugs, by acting on the glomerulus or renal tubules, can excrete excess water from the body by inhibiting sodium reabsorption, and a large amount of urine will be formed, so that the water in the body is reduced, and it plays a role in reducing edema. For the use of diuretics, attention must be paid to electrolyte balance.