Eugenol is levothyroxine sodium tablets, when used according to the condition to determine the scope of use and dosage, in the following cases belong to the relative contraindication or need to be evaluated for use, such as acute cardiac infarction, hyperthyroidism, adrenal insufficiency, etc., there is no clear “7 contraindications” of the statement, you should follow the doctor’s instructions for use of medication. 1. Acute myocardial infarction or acute coronary syndrome. Because levothyroxine sodium tablets have the risk of inducing coronary artery spasm, according to the condition of the suspension or reduce the dose of use. 2. Hypersensitivity to thyroid hormones or excipients. 3. Undiagnosed thyroid dysfunction, thyrotoxicosis or hyperthyroidism. 4. Hypopituitarism or hypoadrenocorticism, if thyroid supplementation is required, adrenocorticotropic hormone should be used several days prior to the administration of levothyroxine sodium. 5. Subclinical hyperthyroidism. Levothyroxine sodium tablets need to be used under the guidance of a physician, to exclude contraindications to use, but also need to monitor the thyroid function in order to adjust the dosage of the drug.