What is the purpose of the drug Levothyroxine, marketed as Synthroid?

Levothyroxine, marketed as Synthroid, is specifically used for thyroid hormone replacement therapy. This medication is a synthetic form of thyroxine (T4), which is a hormone normally produced by the thyroid gland. It is primarily prescribed for individuals diagnosed with hypothyroidism, a condition where the thyroid does not produce enough hormones to regulate metabolism, energy levels, and overall bodily functions.

By providing an adequate amount of thyroid hormone through Levothyroxine, patients can manage symptoms such as fatigue, weight gain, and sensitivity to cold, which are common in hypothyroidism. This replacement therapy helps restore normal metabolic functioning and maintains a proper hormonal balance in the body.

The other purposes listed, such as pain relief, cholesterol reduction, and allergy treatment, are not related to Levothyroxine's function. Thus, those choices do not align with the primary therapeutic use of this medication.