Eugenol should be taken before meals. It is recommended that patients take it half an hour before breakfast, on an empty stomach with a one-time dose of a suitable liquid, such as half a glass of warm water, which is a recommended usage. This is a recommended use because it is taken on an empty stomach to allow better absorption of the drug and better efficacy, and it is recommended to be taken in the morning, as taking Eugenol in the morning can better simulate the normal physiological function of the thyroid gland. It can be used in patients with underactive thyroid gland and can be used for replacement therapy of hypothyroidism. It is important to monitor the thyroid function during the use period and go to the hospital regularly to review the relevant indicators of the thyroid gland. In conclusion, Eugenol or levothyroxine sodium tablets are generally recommended to be taken on an empty stomach, and patients are advised to take them half an hour before breakfast.