It is manufactured by King Pharmaceuticals, Inc.
The thyroid gland makes two different thyroid hormones -- triiodothyronine (T
3) and levothyroxine (T
4).
Usually, the thyroid gland produces much more T
4 than T
3 (however, T
3 is much more active than T
4). The body can convert the T
4 hormone into T
3 as necessary. If your thyroid does not make enough thyroid hormones, there are a few different ways to increase your levels.
Some forms of thyroid replacement combine both T
3 and T
4 (such as natural thyroid replacement made from pig thyroids). However, because the body converts T
4 into T
3 as needed, most people can successfully take just T
4 (such as with Levoxyl). Alternatively, just T
3 can be taken (with products such as
Cytomel®). Currently, most people take just T
4 products (such as Levoxyl).
Although it is synthetic, Levoxyl is identical to the naturally occurring hormone levothyroxine (also known as T4).
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