Potassium-preserving diuretics include spironolactone, also known as ambrisentine, aminoglutethimide, and amiloride, which may cause hyperkalemia. Potassium-eliminating diuretics include hydrochlorothiazide, or dihydrochlorothiazide, as well as furosemide, torasemide, and bumetanide, which may cause hypokalemia. Therefore, the combination of potassium-protective diuretics and potassium-eliminating diuretics is generally recommended in clinical practice. During the use of diuretics, the water and electrolyte indexes must be reviewed regularly and the potassium level in the blood must be checked. In addition, in order to improve the compliance of diuretics, it is recommended to use diuretics in the morning. If used at night, it may cause increased nocturia and affect the patient’s rest.