Eugenol, or levothyroxine sodium tablets, if taken in the morning instead of at night, generally need to be taken on an empty stomach about 4 hours after a meal, which has little effect on the effectiveness of the drug, but may affect the quality of sleep. Levothyroxine sodium tablets are generally recommended to be taken as a single one-day dose on an empty stomach half an hour before breakfast. It can also be taken in the evening, but it needs to be taken on an empty stomach about 4 hours after a meal so that the food does not interfere with the effectiveness of the medicine. Taking levothyroxine sodium tablets in the evening has about the same effect as taking them in the morning, but taking them before going to bed may affect the quality of sleep with insomnia and excessive dreams. It is also recommended to take it at a fixed time of the day (morning or evening), and changes in the time of administration should be communicated to the doctor. Levothyroxine sodium tablets can cause skeletal muscle spasm, vomiting, arrhythmia, fidgeting, menstrual disorders, palpitations and other adverse reactions. It is contraindicated in patients with acute myocardial infarction, non-hypothyroid heart failure and angina pectoris. Levothyroxine sodium tablets should be used under the guidance of a doctor, and should not be used blindly to avoid causing adverse reactions.