Taking levothyroxine sodium tablets should pay attention to the regular use of medication, strictly observe the contraindications, pay attention to the reaction to the drug, and regularly review the thyroid function. 1. Regular use of medication: levothyroxine sodium tablets should be half an hour before breakfast, fasting one-day dose of a one-time delivery of appropriate liquid (such as half a cup of water). 2. Contraindications: It is contraindicated in cases of hypersensitivity to the product and its excipients, untreated hypoadrenalism, pituitary insufficiency and thyrotoxicosis, acute myocardial infarction, acute myocarditis and acute total carditis. 3. Concerned about drug reactions: the common clinical adverse reactions of this product include arrhythmia, palpitation, angina pectoris, headache, muscle weakness and spasms, flushing, vomiting, menstrual disorders, tremor, fidgeting, insomnia, hyperhidrosis, weight loss and diarrhea. 4. Regular review: In the early stage of treatment, the thyroid function should be checked every 4~6 weeks, and the medication program should be adjusted according to the result until the treatment reaches the standard, and thereafter the thyroid function should be reviewed every 6~12 months. It is recommended that patients who need to take levothyroxine sodium tablets go to the regular hospital in time, under the guidance of the doctor reasonable use of medication, standardized treatment, in order to avoid delaying the condition or lead to adverse reactions.