Diuretics are taken in the following ways: timely detection of the level of blood potassium, blood calcium, creatinine and other indicators, timely adjustment of medication. The specific method of taking diuretics is related to the type of diuretics. Diuretics can improve fluid storage, reduce ventricular preload, and play an important role in the treatment of heart failure, hypertension and other diseases. Commonly used diuretics are categorized into tabular diuretics, thiazide diuretics, potassium-preserving diuretics and so on. 1. Collaterals diuretics: for example, furosemide, which is a potassium-excreting diuretic, is commonly used in the treatment of left heart failure. Furosemide should be taken in small doses, and blood potassium level should be tested regularly when taking the drug. 2. Thiazide diuretics: For example, hydrochlorothiazide is a potassium-excreting diuretic, which is commonly used in the treatment of mild heart failure. Long-term use of hydrochlorothiazide is not recommended to prevent hypokalemia and is strictly prohibited for gout patients. 3. Potassium-preserving diuretics: for example, spironolactone, when taking spironolactone, attention should be paid to the regular detection of electrolytes, once there is an abnormality in blood calcium, blood potassium and creatinine, it is necessary to adjust the medication in time. There are many kinds of diuretics, and the indications and contraindications are complicated, so it is recommended that patients use them according to the doctor’s instructions to prevent aggravation of the condition.