The main function of diuretics is to dehydrate and lower blood pressure. Most patients using diuretics may lead to electrolyte imbalance, which can be divided into the following categories according to the depot potassium: a. Thiazides, commonly hydrochlorothiazide, etc., mainly act in the distal tubule of the kidney, which can inhibit the reabsorption of sodium ions and play the role of drainage and sodium excretion, with the main side effect of kidney function damage and easily cause hypokalemia and hyponatremia It is not suitable for use in patients with kidney disease. Secondly, potassium-protective diuretics, commonly known as Antiseptic, have a potassium-protective effect and reduce the excretion of potassium, but the side effect is hyperkalemia, in the process of taking, to control the intake of potassium, it is recommended to use a low-potassium diet. Third, osmotic diuretics, commonly known as mannitol, etc., use the effect of osmotic pressure to excrete water out of the body. Fourth, the medullary collaterals diuretics, commonly have tachyphylaxis, etc., the main site of action in the medullary collaterals, inhibit the reabsorption of sodium ions, play a drainage role, easy to cause hyponatremia, leading to gastrointestinal discomfort, serious side effects for ototoxicity, in the process of use, also need special attention. Regardless of which situation requires the use of diuretics, it is recommended that they be used regularly under medical advice. Different kinds of diuretics, with different side effects, will be analyzed comprehensively by doctors and may be compounded with drugs to maintain physical safety. In the process of taking them, it is also necessary to choose a different diet structure according to the type of drug, and never use the drugs at your own discretion to minimize drug toxicity.