What is a primary function of levothyroxine in treating hypothyroidism?

Levothyroxine primarily functions to replace thyroid hormone in individuals diagnosed with hypothyroidism. This medication is a synthetic form of thyroxine (T4), which is essential for regulating metabolism, energy levels, and many other bodily functions. In patients with hypothyroidism, the thyroid gland is underactive and does not produce sufficient thyroid hormones, leading to symptoms such as fatigue, weight gain, and depression.

By providing an external source of T4, levothyroxine helps restore normal thyroid hormone levels in the body, thereby alleviating the symptoms associated with hypothyroidism and normalizing metabolic processes. This hormone replacement therapy is critical for maintaining homeostasis and supporting overall health in individuals with this condition.