The time needed for potassium supplementation depends on the extent of the patient’s potassium deficiency. Mild hyperkalemia can be corrected on the same day, while severe hyperkalemia usually takes 3 to 5 days to correct. A serum potassium concentration of less than 3.5 mmol/L is called hypokalemia. Normally, the blood potassium concentration reflects the total potassium content in the body, and hypokalemia is often accompanied by potassium deficiency. In case of mild hypokalemia, the diet can be rich in potassium-containing foods (e.g. bananas, oranges, oranges, etc.), and the nutritional diet can be reasonably matched to increase the K⁺concentration through the diet; for severe hypokalemia or the occurrence of obvious complications, such as cardiac arrhythmia, etc., potassium supplementation should be given in a timely manner. It is best to take it orally. If oral administration is not possible or ineffective, consider intravenous drip or pumping in potassium supplementation. When intravenous drip or pumping in potassium supplementation, heart rate and heart rhythm should be observed, and blood potassium concentration should be measured at regular intervals, so that the dose of drugs can be adjusted in time. When the blood potassium concentration reaches the normal level, potassium supplementation should be stopped so as not to cause excessive concentration of potassium ions in the blood and cardiac arrest. If any physical discomfort occurs in the course of potassium supplementation, please stop the medication immediately, go to the hospital and take the test according to the doctor’s instruction to avoid delaying the condition.