Indication: 1. Treat hypokalemia caused by various reasons, such as insufficient food intake, vomiting, severe diarrhea, use of potassium diuretics, periodic paralysis of hypokalemic family, long-term use of glucocorticoid and hypokalemia caused by hyperosmolar glucose. 2. Prevention of hypokalemia. When patients have potassium loss, especially if the occurrence of hypokalemia is more harmful to patients (such as those who use digitalized rehmannia drugs), preventive supplement of potash should be required, such as eating little, severe or chronic diarrhea, long-term administration of adrenocortical hormone, potassium loss nephropathy, Bartter syndrome, etc. 3. Frequent, multi-source premature beats or rapid arrhythmia may be caused by digitalization poisoning.