The dose of medication should be accurate, do not increase or decrease the dose at will, do not stop the medication on your own, if you vomit within 15 minutes after taking the medication, you should take the medication at the right time, once every 12 hours, at 7:00 am and 7:00 pm, do not change at will. Measure pulse or heart rate before taking the medication, and stop the medication once if there is heart rhythm disturbance or heart rate is slower than a certain number of times, as follows: less than 3 months: less than 120 times/min less than 1 year old: less than 100 times/min 1-5 years old: less than 90 times/min older than 5 years old: less than 80 times/min After taking the medication, observe any adverse reactions: digestive tract reactions: loss of appetite, nausea, vomiting, etc. Neurological reactions: irritability, headache, dizziness, fatigue, etc. Headache, dizziness, fatigue, blurred vision, yellow vision, green vision Cardiotoxic reactions: premature ventricular oscillation, duplex and triplex rhythm, paroxysmal tachycardia, atrioventricular block and ventricular fibrillation, etc. If any of these manifestations occur, seek medical consultation promptly. Use with caution or do not use in patients with hypokalemia and atrioventricular block.