The more commonly used diuretics include thiazide diuretics, medullary diuretics and potassium-protective diuretics, as well as osmotic drugs that can improve osmotic pressure to achieve diuretic effect, the more representative drugs are hydrochlorothiazide, which mainly acts on the renal tubules and causes sodium reabsorption to play a diuretic effect. A representative drug for medullary diuretics is furosemide, which has a strong diuretic effect and can inhibit sodium reabsorption and play a diuretic role. Potassium-preserving diuretics such as spironolactone, which can preserve potassium in the body to achieve the effect of urination, can generally be used for patients with hypokalemia. Osmotic diuretics such as mannitol or glycerol fructose can regulate the osmotic pressure in the urine and excrete the water in the urine along with the drug, thus playing a diuretic role.