Potassium chloride is a medication used clinically to treat electrolyte disorders, and it is available in both injection and tablet form. Injections are usually potassium chloride injections, which are often administered in 500 ml of saline, or dextrose water. Potassium chloride tablets, usually a 0.5g tablet, are commonly used to treat hypokalemia, and are used in neurology to treat hypokalemic periodic paralysis, in which patients experience periodic weakness in their limbs due to low potassium, which can lead to paralysis of the limbs in severe cases. If the blood potassium is too low, it may also induce cardiac arrhythmia and even lead to the patient’s death. Potassium supplementation should be injected orally, if the patient’s condition permits, try to take it orally. If the general condition is poor or the potassium is too low, the use of intravenous potassium supplementation can be considered, and the maximum amount of intravenous potassium supplementation should not be more than 1.5g a day.