Levothyroxine: An Overview Levothyroxine is a synthetic hormone used to treat hypothyroidism, a condition in which the thyroid gland does not produce enough thyroid hormone. Thyroid hormone is essential for regulating a number of important bodily functions, including metabolism, growth, and development. Levothyroxine is available as a tablet and an injection. The tablet is taken… Continue reading Levothyroxine: What is it and What is it Used For?