Lethyrox 25 Tablet contains Thyroxine sodium 25 mcg, a synthetic form of the thyroid hormone thyroxine (T4), used primarily in the management of hypothyroidism and other thyroid-related disorders. Thyroxine plays a crucial role in regulating metabolism, growth, and development by influencing various physiological processes. Lethyrox 25 is indicated for patients with an underactive thyroid gland (primary hypothyroidism), including congenital hypothyroidism, as well as for the suppression of thyroid-stimulating hormone (TSH) in conditions such as thyroid nodules, goiter, and certain types of thyroid cancer. The medication is administered orally, with dosing individualized based on the patient’s clinical response, age, weight, and severity of hormone deficiency. It is essential to monitor thyroid function tests periodically to adjust the dose and avoid adverse effects. Common side effects may include symptoms of hyperthyroidism if overdosed, such as palpitations, nervousness, weight loss, and heat intolerance. Lethyrox 25 should be used cautiously in patients with cardiovascular disease, adrenal insufficiency, or during pregnancy, under medical supervision. This medication is not intended for weight loss in euthyroid individuals. Proper adherence to prescribed dosing and regular follow-up with healthcare providers ensure optimal therapeutic outcomes.