Which medication is commonly prescribed for the treatment of hypothyroidism?

Levothyroxine is commonly prescribed for the treatment of hypothyroidism because it is a synthetic form of the thyroid hormone thyroxine (T4), which is essential for regulating metabolism and maintaining normal physiological functions. In patients with hypothyroidism, the thyroid gland does not produce enough hormones, leading to symptoms such as fatigue, weight gain, and depression. Levothyroxine effectively replenishes the deficiency, helping to restore normal hormone levels in the body.

This medication is preferred due to its effectiveness, predictable pharmacokinetics, and the availability of various formulations that assist in individualized dosing. It is typically initiated at a low dose and adjusted based on the patient's thyroid function tests, primarily measuring TSH (Thyroid-Stimulating Hormone) levels.

In contrast, the other medications listed serve different purposes. Methimazole, for instance, is used to treat hyperthyroidism by inhibiting thyroid hormone synthesis, rather than replenishing it. Thyroid peroxidase is an enzyme involved in the production of thyroid hormones, but it is not a medication that would be prescribed directly. Propylthiouracil also works to reduce thyroid hormone production and is primarily used in hyperthyroid conditions. Therefore, Levothyroxine is the