Euthyrox is the trade name and generic name of Levothyroxine Sodium Tablets, a thyroid hormone drug, which is usually not fattening after taking it. Levothyroxine Sodium Tablet is a thyroid hormone drug, which can be used for the treatment of hypothyroidism replacement therapy, suppressive therapy after thyroid cancer surgery, and non-toxic goiter. Long-term overdose may cause adverse reactions such as hand tremor, palpitations (rapid heartbeat, often accompanied by panic), weight loss, excessive sweating, insomnia, and increased frequency of bowel movements, so it does not usually appear to have gained weight after taking it. It should be noted that patients who are allergic to levothyroxine sodium tablets, suffer from tachyarrhythmia, non-hypothyroid heart failure, or have had a recent heart attack should not be treated with this drug. Patients who need to use levothyroxine sodium tablets for treatment should use the drug under the guidance of a doctor, and if any uncomfortable symptoms occur, it is recommended to go to the hospital.