Euthyrox, or levothyroxine sodium tablets, drug dosage is determined according to the type of disease, their own situation and other factors, generally not used to determine the severity of the disease, can be based on blood thyroid hormone levels, clinical symptoms and other assessment of the condition. Levothyroxine Sodium Tablet is mainly used for the treatment of hypothyroidism, the common specifications are 50µg per tablet and 100µg per tablet, the specifications of the drug produced by different manufacturers may be different. The dosage of Levothyroxine Sodium Tablets should be determined by the type of disease, your condition and other factors, you should choose a lower initial dose and slowly increase the dose at longer intervals, while thyroxine levels need to be closely monitored. The severity of the disease can be assessed on the basis of blood thyroid hormone levels, clinical symptoms and other factors. Contraindications to the drug include hypersensitivity to the drug, tachyarrhythmias, non-hypothyroid heart failure, and recent myocardial infarction. Adverse reactions include angina pectoris, arrhythmia, palpitations, tremor, euphoria, and headache. Use of the drug should be under the supervision of a doctor.