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Levothyroxine is a replacement for a hormone that is normally produced by your thyroid
gland to regulate the body's energy and metabolism. Levothyroxine is given when the thyroid
does not produce enough of this hormone on its own.
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Thyroid agent; sodium salt of the L -isomer of thyroxine (tetraiodothyronine, T 4 ).
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Liothyronine is a naturally occurring hormone produced by the thyroid. It is important for
normal energy and metabolism. For a variety of reasons, the body may not produce enough of this
hormone on its own. In these cases, liothyronine is taken to replace the body's natural thyroid
hormone.
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Synthetic thyroid agent; sodium salt of the L -isomer of 3,3′,5-triiodothyronine ( L -T 3 ).
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Triiodothyronine (T3) is a hormone produced by the thyroid gland. It plays an important role in the body's control of metabolism. A laboratory test can be done to measures the amount of the T3 in your blood. See also: TSH test; T4 test.
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