Levothyroxine (Synthroid, Levothroid, Levoxyl, and others) interacts with THYROID EXTRACT
Thyroid extract contains the thyroid hormones triiodothyronine (T3) and thyroxine (T4). Levothyroxine is used to increase thyroid hormone levels in people whose levels are too low. In theory, taking thyroid extract with levothyroxine might increase the effects and side effects of levothyroxine.
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