Thyroxine / triiodothyronine combinations are used to treat hypothyroidism, or a condition of low thyroid hormone levels in the body. They also have other uses, such as managing goiter and managing certain types of thyroid cancer. These medications work by providing a combination of two thyroid hormones, thyroxine (T4) and triiodothyronine (T3), which help regulate your body's energy and metabolism. These combinations are typically available in oral tablet form. Examples include Armour Thyroid (desiccated thyroid). You can discuss with your healthcare professional to see whether these treatments are right for you.