1. Dried thyroid tablets are made from dried thyroid gland of animals (mainly pig and bovine thyroid gland as raw material, mainly pig thyroid gland as raw material in China), ground into powder and pressed into tablets. Dried thyroid tablets can only be absorbed through the intestinal tract, and their potency is not stable enough. The dose of dried thyroid is 40mg per tablet, and the daily replacement dose is 40-60mg/day, and individual patients need 80-120mg/day. 2, L-type thyroxine tablets L-T4 is a synthetic thyroid preparations, stable potency, oral tablets and intravenous injection of two, its sodium salt can be used for intravenous injection, especially suitable for mucus edema coma patients with oral preparations absorption rate of 50% -80%, in the plasma half-life of 7-8 days, can be taken once a day. There are three kinds of drug tablet doses, namely 20mg/per tablet, 50mg/per tablet and 100mg/per tablet. At present, China has been able to produce tablets. 3.Triiodothyronine T3 is also a synthetic thyroid hormone preparation with stable potency. It is only available as an oral preparation with a half-life of 24 hours in plasma, and the daily dose needs to be taken in divided doses or at one time. Due to the high number of T3 receptors in cardiomyocytes, the cardiovascular effect of T3 in patients after taking the drug is too strong, which can induce angina pectoris, myocardial infarction and heart failure, and is dangerous for elderly patients and cardiovascular patients, and is rarely used clinically.