Elderly people with potassium deficiency need to replenish potassium in time, and commonly used drugs include potassium chloride tablets, potassium chloride slow-release tablets, potassium citrate granules, potassium and magnesium menthylate tablets and so on. Potassium can also be replenished through food. Eating more tangerines, oranges, bananas and other fruits is also conducive to replenishing potassium. The normal blood potassium concentration in the body is 3.5-5.5mmol/L. If the blood potassium concentration is lower than 3.5mmol/L, it is called hypokalemia, which may cause the symptoms of limb weakness, and even cardiac arrhythmia if it is severely low in potassium. Therefore, when hypokalemia occurs, it should be actively consulted in hospitals, and medication should be taken for the treatment under the guidance of doctors. Commonly used therapeutic drugs include potassium chloride tablets, potassium chloride extended-release tablets, potassium citrate granules, potassium magnesium menthylate tablets and so on, which can be selected under the guidance of doctors and according to the patient’s blood potassium condition for treatment. At the same time, patients can eat bananas, oranges, oranges and other fruits rich in potassium in their daily diet, and review the blood potassium situation in time. Drugs should be used reasonably under the guidance of the doctor, and attention should be paid to urine potassium supplementation, and the cause of potassium deficiency should be actively identified.