Final answer:
Liothyronine, also known as Cytomel, is a synthetic form of the thyroid hormone T3. It is used to treat hypothyroidism by increasing the levels of thyroid hormones in the body to regulate metabolism and energy levels.
Step-by-step explanation:
Liothyronine, also known by the brand name Cytomel, is a synthetic form of triiodothyronine (T3), which is a thyroid hormone containing three iodine atoms. It is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormones. Liothyronine works by increasing the levels of thyroid hormones in the body, which helps regulate the body's metabolism and energy levels.