The generic name of Eugenol is Levothyroxine Sodium Tablet, and it is usually normal to have an elevated level of free thyroid hormone after taking the medicine. It is also necessary to look at the comparison of this indicator with the reference value, combined with other indicators such as TSH comprehensive judgment, abnormalities can be adjusted under the guidance of the doctor’s medication. Clinically, levothyroxine sodium tablets are mainly used in hypothyroidism patients with insufficient secretion of thyroid hormone replacement therapy, the free thyroid hormone level after taking the drug is usually a normal phenomenon, but also need to be combined with the index and reference value of the comparison of the situation, as well as other indicators of the thyroid function, to assess whether the level of elevated abnormality. If the level of thyroid hormone rises significantly after the use of the drug, exceeding the normal reference value range, and the level of TSH decreases significantly, it suggests that the drug may be overdosed, and the dosage of the drug needs to be adjusted under the guidance of the clinician; thyroid hormone and TSH are within the normal range, and generally do not require special treatment. Contraindications include allergy to the drug, tachyarrhythmia, non-hypothyroid heart failure, and recent myocardial infarction. Adverse reactions include angina pectoris, arrhythmia, palpitations, tremor, euphoria, headache, restlessness, insomnia, diarrhea, vomiting, excessive sweating, flushing, weight loss, and skeletal muscle spasms. In the process of medication, attention should be paid to the regular examination of thyroid function, the emergence of abnormal hormone levels need to consult a doctor in a timely manner, under the guidance of clinicians to deal with.