The main methods of rapid swelling reduction and diuresis include oral diuretics (such as furosemide tablets) and intravenous diuretics (such as torasemide injection). Diuretics are a class of drugs that promote the elimination of water and electrolytes from the body, thereby increasing urine output to achieve fluid balance. Diuretics accomplish their task of increasing elimination mainly by affecting glomerular filtration, tubular reabsorption and secretion. Commonly used oral diuretics mainly include furosemide tablets, hydrochlorothiazide tablets, spironolactone tablets and so on. Furosemide tablets belong to the collaterals diuretics, mainly through the inhibition of renal tubular medullary collaterals ascending branch reabsorption function, produce a large amount of protonuria, on the cardiogenic disease caused by double lower limb edema and renal edema have obvious diuretic effect. The site of action of hydrochlorothiazide tablets is in the distal convoluted tubule, which can increase water excretion. Spironolactone tablets have a potassium-preserving and sodium-excretory effect and are often combined with potassium-excretory diuretics to avoid causing hypokalemia, which can cause adverse reactions. Intravenous diuretics mainly include torasemide injection and furosemide injection, which have good diuretic effects on cardiogenic and nephrogenic edema. Diuretics can cause hypotension, electrolyte disorders and other adverse reactions, common low potassium, low sodium and hypochlorhydria alkalosis. Therefore, they should be used with caution. It is recommended that patients choose appropriate diuretics according to clinical needs under the guidance of a doctor, and follow the doctor’s instructions to standardize the use of medication.