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You are here: Home » eGM Resources » Health Information & Resources Portal|Home » RX Drug List (listed alphabetically) » Drug Reference (L's) » Levothyroxine


Levothyroxine sodium tablets and injection contain 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 C15H10I4NNaO4xH2O, and molecular weight of 798.86 (anhydrous).

Synthroid Tablets Inactive Ingredients: Acacia, confectioner's sugar (contains cornstarch), lactose, magnesium stearate, povidone, and talc. The following are the color additives by tablet strength: 25 mg: FD&C yellow No. 6; 50 mg: None; 75 mg: FD&C red No. 40, FD&C blue No. 2; 88 mg: FD&C blue No. 1, FD&C yellow No. 6, D&C yellow No. 10; 100 mg: D&C yellow No.10, FD&C yellow No. 6; 112 mg: D&C red No. 27 & 30; 125 mg: FD&C yellow No. 6, FD&C red No. 40, FD&C blue No. 1; 150 mg: FD&C blue No. 2; 175 mg: FD&C blue No. 1, D&C red No. 27 & 30; 200 mg: FD&C red No. 40; 300 mg: D&C yellow No. 10, FD&C yellow No. 6, FD&C blue No. 1.

Synthroid Injection Inactive Ingredients: 10 mg mannitol, USP, sodium hydroxide, 0.7 mg tribasic sodium phosphate, anhydrous dodecahydrate. Levothyroxine sodium powder for reconstitution for injection is a sterile preparation.


CATEGORIES: Goiter, euthyroid; Hypothyroidism; Pregnancy Category A; FDA Pre 1938 Drugs; Top 200 Drugs; WHO Formulary

FDA Drug Classes: Thyroid


BRAND NAMES: Berlthyrox; Droxine; Eferox; Elthyrone; Eltroxin; Euthyrox; Eutirox; L-Thyroxine; Letrox; Levaxin; Levo-T; Levotirox; Levothroid; Levothyrox; Levotiroxina; Levoxyl; Oroxine; Synthroid; Synthrox; T4KP; Thevier; Throxinique; Thyradin; Thyradin S; Thyrax; Thyrax Duotab; Thyrex; Thyro-4; Thyrosit; Thyroxin; Thyroxin-Natrium; Thyroxine; Tiroidine
(Foreign Brand names outside U.S. in italics)

Berlthyrox (Germany)
Droxine (Australia; New-Zealand)
Eferox (Germany)
Elthyrone (Belgium)
Eltroxin (Bahamas; Bahrain; Barbados; Belize; Benin; Bermuda; Burkina-Faso; Canada; Curacao; Cyprus; Czech-Republic; Denmark; Egypt; England; Ethiopia; Gambia; Ghana; Guinea; Guyana; Hong-Kong; Hungary; India; Iran; Iraq; Ireland; Israel; Israel; Ivory-Coast; Jamaica; Japan; Jordan; Kenya; Kuwait; Lebanon; Liberia; Libya; Malawi; Mali; Mauritania; Mauritius; Morocco; Netherland-Antilles; Netherlands; Niger; Nigeria; Oman; Philippines; Puerto-Rico; Qatar; Republic-Of-Yemen; Saudi-Arabia; Senegal; Seychelles; Sierra-Leone; South-Africa; South-Africa; Sudan; Surinam; Switzerland; Syria; Taiwan; Tanzania; Thailand; Trinidad; Tunia; Uganda; United-Arab-Emirates; Zambia; Zimbabwe)
Euthyrox (Austria; Belgium; Bulgaria; Czech-Republic; Germany; Hungary; Netherlands)
Eutirox (Ireland; Italy; Mexico)
Letrox (Bahrain; Cyprus; Egypt; Iran; Iraq; Jordan; Kuwait; Lebanon; Libya; Oman; Qatar; Republic-Of-Yemen; Saudi-Arabia; Syria; United-Arab-Emirates)
Levaxin (Sweden)
Levotirox (Italy)
Levothyrox (France)
Levotiroxina (Ecuador)
Oroxine (Australia; Malaysia; New-Zealand)
T4KP (Thailand)
Thevier (Germany)
Thyradin S (Japan)
Thyrax (Belgium; Czech-Republic; Hungary; Indonesia; Netherlands; Philippines; Portugal; Spain)
Thyrax Duotab (Benin; Burkina-Faso; Ethiopia; Gambia; Ghana; Guinea; Ivory-Coast; Kenya; Liberia; Malawi; Mali; Mauritania; Mauritius; Morocco; Niger; Nigeria; Senegal; Seychelles; Sierra-Leone; South-Africa; Sudan; Tanzania; Tunia; Uganda; Zambia; Zimbabwe)
Thyrex (Austria)
Thyro-4 (Bulgaria; Greece)
Thyrosit (Thailand)
Thyroxin (Finland)
Thyroxin-Natrium (Norway)
Tiroidine (Mexico)

COST OF THERAPY: $127.75 (Hypothyroidism; Tablet; 0.1 mg; 1/day; 365 days)

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