Hypothyroidism (low thyroid) is a major complication of hyperthyroidism treatment (including iodine-131 and medication) or after thyroid surgery. Other causes (such as postpartum thyroiditis, Hashimoto’s thyroiditis, etc.) may also lead to hypothyroidism. Therefore, it is very important to recognize and manage hypothyroidism in a timely manner. The main physiological function of the thyroid gland is the production of thyroid hormones, and “hypothyroidism” means that the thyroid tissue does not produce enough thyroid hormones for the body to use, resulting in a series of syndromes. You may be overwhelmed by the treatment of low thyroid, or you may be worried by the simple answer of some doctors, “You’re hopeless, you’ll have to take medication for the rest of your life! You may be worried because of the simple answer of some doctors. So, is hypothyroidism really scary? In fact, once you understand the treatment process of hypothyroidism, you will be able to face it openly, because reasonable and appropriate amount of thyroxine supplementation can eliminate the symptoms of hypothyroidism and get a normal quality of life without side effects. As long as your thyroid function is normal, you are a normal person and you can be pregnant and breastfeeding while on the medication! But when you know that taking thyroid replacement therapy is as easy as eating, drinking water, or taking vitamins and calcium supplements, your concerns will be allayed. The levothyroxine tablets (e.g. Eugenol 50ug) that are commonly used in clinical practice are relatively inexpensive at 100 tablets and are publicly funded. Generally speaking, most daily supplements are between half and 2 tablets, and the total number of tablets per year is between 180 and 720, which costs about$200 a year at most. For the side effects of hyperthyroidism medications and the need for regular blood draws to adjust the dosage, taking levothyroxine tablets instead is such an easy and inexpensive thing to do. Patients: Be happy that you can live a happy and healthy life with just one “tonic pill” a day! Clinical experience has shown that both subclinical and clinical hypothyroidism, early onset hypothyroidism and late onset hypothyroidism should be treated with Eugenol replacement therapy, and then thyroid function should be maintained in the normal range. The dose of thyroxine required for patients with hypothyroidism is related to the degree of hypothyroidism and the enterohepatic circulation of thyroxine, and the following factors affect the replacement dose: 1) body weight: for obviously obese patients, the ideal body weight (1.6ug/kg) may be more scientific and practical; 2) age: infants and children require a slightly higher dose than adults (4-5ug/kg body weight), and the dose is reduced for the elderly (>65 years old); 3) gender: women require a full replacement dose. (2) Gender: the adequate replacement dose for women is slightly smaller than that for men; (4) Season: the demand for hormones increases in cold weather, while the opposite is true in summer. 5) Drug interactions: taking estrogen, certain drugs that block drug absorption (abbreviated bile amine, aluminum thioglycollate and ferrous sulfate, etc.) or drugs that increase thyroxine clearance (acetaminophen) should increase the dosage of thyroxine. Commonly used drugs for hypothyroidism are as follows: 1. Dried thyroid tablets are made from dried thyroid glands of animals (mainly pig and bovine thyroid glands as raw materials, mainly pig thyroid glands 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-thyroxine, L-T4) L-T4 is a synthetic thyroid preparation, stable potency, oral tablets and intravenous injection of two, its sodium salt can be used for intravenous injection, especially for patients with mucus edema coma, oral preparation absorption rate of 50% to 80%, in the plasma half-life of 7 to 8 days, once a day can be taken. 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.Liothyronine-T3 T3 is also a synthetic thyroid hormone preparation with stable potency and is only available in oral form. 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, so it is rarely used clinically.