SPL Set ID: dac0af5d-622c-e18c-e053-2995a90a5739

Levothyroxine sodium tablets USP is L-thyroxine (T4) and contains synthetic crystalline L-3,3',5,5' tetraiodothyronine sodium salt. Synthetic T4 is chemically identical to that produced in the human thyroid gland. Levothyroxine (T4) sodium has an empirical formula of C 15 H 10 I 4 N NaO 4 •H 2 O, molecular weight of 798.85 (anhydrous), and structural formula as shown: Levothyroxine sodium tablets USP for oral administration are supplied in the following strengths: 25 mcg, 50 mcg, 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg, and 300 mcg. Each levothyroxine sodium tablets USP contains the inactive ingredients corn starch, croscarmellose sodium, magnesium stearate, mannitol and sodium bicarbonate. Table 9 provides a listing of the color additives by tablet strength: Table 9. Levothyroxine Sodium Tablets USP Color Additives Levothyroxine sodium tablet USP meets USP Dissolution Test 2. Strength (mcg) Color additive(s) 25 FD&C Yellow No. 6 Aluminum Lake* 50 FD&C Blue 1 Aluminum Lake 75 FD&C Red No. 40 Aluminum Lake, FD&C Blue No. 2 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 125 FD&C Yellow No. 6 Aluminum Lake*, FD&C Blue No. 1 Aluminum Lake, FD&C Red No. 40 Aluminum Lake, FD&C Blue No. 2 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. 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 *Note – FD&C Yellow No. 6 Aluminum Lake is peach in color. image-1