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Thyroid USP

Important Information for Your Healthcare Provider

You should talk with your healthcare provider prior to taking thyroid USP if you have:
Also, let your healthcare provider know if you are:
Make sure to tell your healthcare provider about any other medicines you are taking, including prescription and nonprescription medicines, vitamins, and herbal supplements.
(Click Precautions and Warnings With Thyroid USP to learn more, including information on who should not take the drug.)

How Does Thyroid USP Work?

The thyroid gland makes two different thyroid hormones: triiodothyronine (T3) and thyroid USP (T4). Usually, the thyroid gland produces much more T4 than T3; however, T3 is much more active than T4. The body can convert the T4 hormone into T3 as necessary. If your thyroid does not make enough thyroid hormones, there are a few different ways to increase your levels.
Most people with an underactive thyroid are treated with synthetic T4, also known as levothyroxine (Levothroid®, Levoxyl®, Synthroid®, Tirosint®, Unithroid®). However, some people prefer to be treated with natural thyroid products, such as thyroid USP. Thyroid USP is made from pig thyroid glands, so it contains both T3 and T4.
Last reviewed by: Kristi Monson, PharmD
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