Synthroid, Drug Profile
SYNTHROID® (levothyroxine sodium tablets, USP) is an important drug, used to treat hypothyroidism. Synthroid has been extensively studied for over 42 years. It is the most widely prescribed thyroid medicine in the United States. Currently, over eight million people are using Synthroid for thyroid replacement therapy. [Abbott, 2001]
Synthetic Levothyroxine (T4 ) is identical in chemical composition and molecular weight to naturally secreted T4. Synthroid tablets contain the following inactive ingredients: acacia, confectioner's sugar, lactose, magnesium stearate, povidone, talc, and color additives.[Abbott, 2001].
Synthroid is pregnancy category A. Studies have shown that Synthroid increases the risk of fetal abnormalities if given during pregnancy. The possibility of fetal harm does appear to be remote, however, Synthroid should only given during pregnancy if it is clearly needed [Abbott, 2001]. In addition Abbot Laboratories reports that thyroid hormones do cross the placental barrier to some extent. T4 levels in the...
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