Eugenol, also known as levothyroxine tablets, is a drug commonly used after thyroid surgery. Its main ingredient is the main hormone secreted by the thyroid gland, which plays a role in promoting metabolism in the body. If we compare food to the gasoline of a car, then thyroxine is like the lubricant of the engine, helping the organism to convert energy into power. Thyroxine itself is not the same as what we often call “hormones” and does not cause a series of side effects such as obesity. Eugenol is also chemically identical to thyroxine and will not cause any side effects when taken for a long time. Why should I take Eugenol after thyroid surgery? One is for replacement and the other is for treatment. The duration of dosing depends on the nature of the surgery and the amount and function of the residual thyroid gland. For benign thyroid lesions, the purpose of taking Eugenol after surgery is not only to replenish thyroxine, but also to suppress thyrotropin (TSH), so that the TSH level can be stabilized at a low level. The purpose of taking Eugenol after surgery is not only to supplement thyroid hormone, but also to suppress thyrotropin (TSH), so that the TSH level can be stabilized at a low level and thus inhibit the growth of tumor. Of course, the amount of medication needs to be adjusted. Too much medication is hyperthyroidism, which will lead to symptoms such as panic, rapid heartbeat and sweating, while not enough medication is hypothyroidism, which will lead to lethargy, weakness and weight gain. If you go to the hospital to have your thyroid function checked, your doctor will be able to adjust your medication plan according to the results.