Clinically, potassium chloride is mainly used for the treatment of hypokalemia caused by various reasons, such as insufficient food intake, severe vomiting, diarrhea, application of potassium-excreting diuretics as well as hypokalemia after long-term application of glucocorticosteroids and supplementation of hypertonic glucose, etc. Sodium chloride is mainly used for the treatment of various kinds of dehydration, including hypotonic and hypertonic dehydration. On the other hand, sodium chloride is mainly used to treat various kinds of dehydration, including hypotonic, isotonic and hypertonic dehydration, and is also used for hypochloremic metabolic alkalosis, and can also be used as disinfectant to disinfect wounds. The difference between the two is not only in the different indications but also in that they are two completely different drugs, but one thing is the same, they are both effective in the treatment of dehydration, potassium chloride is used to treat hypokalemia, while sodium chloride can be used to treat dehydration caused by diarrhea.