Potassium chloride is used to treat hypokalemia, frequent, multiple premature beats or tachyarrhythmias caused by digitalis intoxication. Potassium chloride can be used to treat hypokalemia caused by severe vomiting without food, application of potassium-removing diuretics, hypokalemic periodic paralysis, severe diarrhea, and prolonged use of glucocorticoids. In addition, patients with frequent premature ventricular beats and paroxysmal tachycardia after digitalis intoxication may be treated with potassium chloride under medical supervision. Treatment with potassium chloride is contraindicated if the patient develops hyperkalemia, chronic renal insufficiency, or acute renal insufficiency. Oral administration may have gastrointestinal irritation symptoms, such as nausea, vomiting, pharyngeal discomfort, chest pain (oesophageal irritation) and other adverse reactions, and when the intravenous drip concentration is high, the speed is fast or the vein is thin, it is easy to stimulate the venous lining to cause pain or even phlebitis. The use of drugs should be under the guidance of a doctor.