Whether potassium chloride can be taken daily for a long period of time needs to be analyzed according to the changes of the condition, for example, it can be taken for a long period of time if the blood potassium is persistently low; and it should be discontinued in a reasonable and timely manner when the blood potassium concentration recovers or is higher than normal. Potassium chloride is generally referred to as potassium chloride extended-release tablets or potassium chloride tablets, which belongs to a kind of electrolyte supplementation drugs, mainly used for the treatment of mild hypokalemia or as a preventive drug, and in the process of using the drug, it is necessary to monitor the concentration of potassium on a regular basis, so as to be able to judge whether it is necessary to continue to use the drug or not. In the course of taking potassium chloride, when the blood potassium concentration exceeds the normal level, the drug must be stopped in time, and the blood potassium concentration should be closely monitored, and standardized treatment must be carried out under the guidance of a doctor. Adverse effects of oral administration of potassium chloride include nausea, vomiting, abdominal pain and throat discomfort, etc. It may even induce peptic ulcer and bleeding, when the symptoms of adverse effects are obvious, the drug must be stopped in time. Contraindications of oral potassium chloride include patients with hyperkalemia and patients with acute and chronic renal insufficiency. When choosing oral potassium chloride for treatment, it must be standardized under the guidance of a doctor.