For post-operative thyroid cancer treatment, levothyroxine sodium tablets, which are made in Germany and called eugenol, are the conventional treatment. After thyroid cancer is removed, the thyroid gland itself does not secrete enough thyroid hormone, so it is treated with Eugenol to achieve the effect of replenishing thyroid hormone in human body. Eugenol has an inhibitory effect on the growth of thyroid tumor cells. The time to take the medication is within one hour before meals every morning. There are also different TSH targets according to the different risk stratification of thyroid cancer. Generally, during the period of taking the medication, blood test of thyroid function can be taken once in 4-6 weeks, and adjustments should be made to the dose of medication when appropriate.