The dosage of thyroxine tablets needs to be tailored for different people. Thyroxine tablets are used in the treatment of hypothyroidism. Adult dosage: oral, the starting dose is 10~20mg per day, and gradually increase, the maintenance dose is usually 40~120mg per day, a few patients need 160mg per day.Infants and children complete replacement dose: within 1 year old: 8~15mg; 1~2 years old: 20~45mg; 2~7 years old: 45~60mg; 7 years old and above: 60~120mg. Thyroxine tablets can cause adverse reactions such as tachycardia, angina pectoris, and arrhythmias if used in excess. It is contraindicated in untreated hypoadrenalism, pituitary insufficiency, thyrotoxicosis, acute myocardial infarction, acute myocarditis. When taking this product, it is necessary to consult with a doctor, who will formulate the specific dosage, do not take it blindly by yourself, so as not to cause adverse reactions.