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Levothroid

Drug Description
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LEVOTHROID®
(levothyroxine sodium) Tablets, USP

DRUG DESCRIPTION

LEVOTHROID® (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 C15H10I4N NaO4 x H2O, molecular weight of 798. 86 g/mol (anhydrous), and structural formula as shown:

LEVOTHROID® (levothyroxine sodium) Structural Formula Illustration

Inactive Ingredients: Microcrystalline cellulose, calcium phosphate dibasic, povidone and magnesium stearate. The following are the coloring additives per tablet strength.

Strength (mcg) Color additive(s)
25 FD&C Yellow No.6 Aluminum Lake
50 None
75 FD&C Blue No.2 Aluminum Lake, FD&C Red No.40 Aluminum Lake
88 FD&C Yellow No.6 Aluminum Lake, FD&C Blue No.1 Aluminum Lake, D&C Yellow No.10 Aluminum Lake
100 FD&C Yellow No.6 Aluminum Lake, D&C Yellow No.10 Aluminum Lake
112 D&C Red No.27 Aluminum Lake, D&C Red No.30 Aluminum Lake
125 FD&C Blue No.1 Aluminum Lake, FD&C Red No.40 Aluminum Lake, FD&C Yellow No.6 Aluminum Lake
137 FD&C Blue No.1 Aluminum Lake
150 FD&C Blue No.2 Aluminum Lake
175 FD&C Blue No.1 Aluminum Lake, D&C Red No.30 Aluminum Lake, D&C Red No.27 Aluminum Lake
200 FD&C Red No.40 Aluminum Lake
300 FD&C Yellow No.6 Aluminum Lake, FD&C Blue No.1 Aluminum Lake, D&C Yellow No.10 Aluminum Lake

Brand Name: Levothroid
Generic Name: Levothyroxine Sodium
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