Thyroxine, also known as T4, is a hormone produced by the thyroid gland in the body. It plays a crucial role in regulating metabolism, growth, and energy levels. Thyroxine is synthesized and released into the bloodstream by the thyroid gland in response to signals from the pituitary gland and hypothalamus.
Thyroxine is used in the treatment of hypothyroidism, a condition characterized by an underactive thyroid gland that does not produce enough thyroid hormones. It helps to restore thyroid hormone levels to normal and alleviate symptoms of hypothyroidism.
Thyroxine functions as a prohormone and is converted into its active form, triiodothyronine (T3), in the body. T3 and T4 regulate metabolism by influencing the activity of various organs and tissues. They affect the rate at which cells use energy (metabolic rate), protein synthesis, and sensitivity to other hormones.



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