It is recommended that any medication be taken at a relatively regular time of day, and Eugenol is no exception, a move that is beneficial in maintaining relatively stable blood levels. The relatively stable blood concentration will directly affect the effect of the medication. The medication should be taken regularly and quantitatively in accordance with medical advice in order to maximize the effect of the medication and reduce and prevent the occurrence of side effects. The active ingredient of Eugenol is synthetic levothyroxine, which is the same as the thyroid gland’s natural secretion of thyroxine. It is converted into T3 in the peripheral organs like endogenous hormones, and then exerts its specific effects by binding to T3 receptors. The body cannot distinguish between endogenous or exogenous levothyroxine, and when the body is deficient in thyroxine, it must be replenished promptly and kept in a relatively stable state that is best for the body. Therefore, it is required to take the medication at a fixed time every day.