Retis is the trade name and generic name for Levothyroxine Sodium Tablets. Its main effect is to supplement the body with thyroxine, which can act on hypothyroidism and assist in the treatment of hyperthyroidism. It can be used to treat hypothyroidism and hyperthyroidism: Levothyroxine Sodium Tablet belongs to the endocrine preparations, which is an imported thyroxine tablet with the effect of replenishing thyroxine in the body. It is generally used for some patients who prevent the recurrence of goiter after goiter removal surgery. For example, after thyroid cancer surgery, to inhibit tumor growth and supplement the lack of thyroid hormone in the body. It can also be used for replacement therapy for hypothyroidism and thyroid function suppression test. Overuse of levothyroxine sodium tablets may cause symptoms of hyperthyroidism, such as: fatigue, weight loss, anxiety, moodiness, muscle weakness and diarrhea. It should be noted that it is contraindicated in patients suffering from non-hypothyroid heart failure, tachyarrhythmia and hypersensitivity to the drug. The drug needs to be used under medical supervision, do not take it blindly on your own.