NOVOTHYROX (levothyroxine sodium tablets, USP) contains synthetic crystalline L-3, 3', 5, 5'-tetraiodothyronine sodium salt [levothyroxine (T4) sodium]. Synthetic T4 is identical to that produced in the human thyroid gland. Levothyroxine (T4) sodium has an empirical formula of C15H10I4NNaO4•H2O, molecular weight of 798.86 g/mol (anhydrous), and structural formula as shown:

  (levothyroxine sodium tablets, USP) Structural Formula Illustration

Inactive Ingredients

NOVOTHYROX (levothyroxine sodium tablets, USP) contain the following inactive ingredients: corn starch, croscarmellose sodium, gelatin, lactose monohydrate, and magnesium stearate. All strengths of NOVOTHYROX (levothyroxine sodium tablets) tablets are formulated without color additives for patients who are sensitive to dyes.

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