The generic name of Eugenol is Levothyroxine Sodium Tablets, which is taken regularly for about 40 years generally without obvious side effects, pay attention to regular review, patients should seek medical treatment in time if there are obvious side effects, and should not stop taking the drug or change the dosage without authorization. Levothyroxine sodium tablets have the effect of replenishing thyroxine, can be used for various causes of hypothyroidism replacement therapy, some patients need to take levothyroxine sodium tablets for life, such as thyroid cancer surgery, congenital hypothyroidism, etc., and can not be discontinued without authorization or change the dose. Levothyroxine sodium tablets are usually not associated with serious side effects when taken regularly for a long period of time at reasonable doses. Common adverse reactions include angina pectoris, arrhythmia, palpitation, tremor, euphoria, headache, restlessness, insomnia, diarrhea, vomiting, excessive sweating, flushing, weight loss, and skeletal muscle cramps. In severe cases, medical attention may be sought. Contraindications: hypersensitivity to the drug, tachyarrhythmia, non-hypothyroid heart failure, recent myocardial infarction, acute myocarditis. Levothyroxine sodium tablets need to be used under the guidance of a specialized doctor to determine the treatment cycle, should avoid taking, reducing or stopping the drug on their own.