Levothyroxine

In some countries, this medicine may only be approved for veterinary use.

In the US, Levothyroxine (levothyroxine systemic) is a member of the drug class thyroid drugs and is used to treat Hashimoto's disease, Hypothyroidism - After Thyroid Removal, Myxedema Coma, Thyroid Suppression Test, TSH Suppression and Underactive Thyroid.

US matches:

UK matches:

LEVOTHYROXINE 100 MICROGRAMS/5ML ORAL SOLUTION (Leaflet)
LEVOTHYROXINE 100MICROGRAMS TABLETS (THYROXINE 100MCG TABS) (Leaflet)
LEVOTHYROXINE 25 MICROGRAMS/5ML ORAL SOLUTION (Leaflet)
LEVOTHYROXINE 25MCG TABLETS (Leaflet)
LEVOTHYROXINE 50 MICROGRAMS/5ML ORAL SOLUTION (Leaflet)
LEVOTHYROXINE 50MICROGRAMS TABLETS (THYROXINE 50MCG TABLETS) (Leaflet)
LEVOTHYROXINE TABLETS 100 MICROGRAMS (Leaflet)
LEVOTHYROXINE TABLETS 25 MICROGRAMS (Leaflet)
LEVOTHYROXINE TABLETS 50 MICROGRAMS (Leaflet)
LEVOTHYROXINE TABLETS B.P. 25MCG. (Leaflet)
LEVOTHYROXINE TABLETS BP 100 MICROGRAMS (Leaflet)
LEVOTHYROXINE TABLETS BP 50 MICROGRAMS (Leaflet)
LEVOTHYROXINE TABLETS BP 50MCG (Leaflet)

Scheme

BAN

CAS registry number (Chemical Abstracts Service)

0000051-48-9

Chemical Formula

C15-H10-I4-N-O4

Molecular Weight

775

Therapeutic Categories

Hormone replacement therapy (HRT)

Thyroid hormone

Chemical Name

L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-

Foreign Names

Levothyroxinum (Latin)
Levothyroxin (German)
Lévothyroxine (French)

Generic Names

Levothyroxine (OS: BAN)
L-Thyroxine (IS)
Thyroxine (IS)
Thyroxinum laevogirum (IS)
Thyroxinum (PH: Ph. Helv. VI)
Lévothyroxine sodique (OS: DCF)
Levothyroxine Sodium (OS: BANM)
Levotiroxina sodica (OS: DCIT)
Thyroxine Sodium (OS: JAN)
Thyroxin-Natrium (IS)
Thyroxinum natricum (IS)
Lévothyroxine sodique (PH: Ph. Eur. 7)
Levothyroxine Sodium (PH: BP 2012, Ph. Int. 4, USP 35)
Levothyroxine sodium (PH: Ph. Eur. 7)
Levothyroxin-Natrium (PH: Ph. Eur. 7)
Levothyroxinum natricum (PH: Ph. Eur. 7, Ph. Int. 4)
UNII-9J765S329G (IS)
Lévothyroxine sodique (PH: Ph. Eur. 7)
Levothyroxine Sodium (PH: USP 35)
Levothyroxine sodium (PH: Ph. Eur. 7, Ph. Int. 4)
Levothyroxine Sodium Hydrate (PH: JP XVI)
Levothyroxinnatrium (PH: Ph. Eur. 7)
Levothyroxinum natricum (PH: Ph. Eur. 7)

Brand Names

Bagothyrox
Cimica Montpelier, Georgia
Eferox
Hexal, Oman
Euthycin
Incepta, Bangladesh
L Thiroxin Berlin-Chemie
Berlin-Chemie, Georgia
Levaxin
Nycomed, Iceland
Lévothyrox
Merck Santé, Tunisia
Novothyral (Levothyroxine and Liothyronine)
Merck, Chile
Somatoline (Levothyroxine and Escin)
Manetti Roberts, Italy
Thiroyd
Greater Pharma, Thailand
Thyro-4
Faran, Tunisia
Thyroid-S
Sriprasit Dispensary, Thailand
Tiroideibsa (Levothyroxine and Liothyronine)
IBSA Farmaceutici Italia, Italy
Berlthyrox
Berlin Chemie Menarini group, Vietnam
Bitiron (Levothyroxine and Liothyronine)
Abdi Ibrahim, Turkey
Combithyrex (Levothyroxine and Liothyronine)
Sandoz, Austria
Combithyrex forte (Levothyroxine and Liothyronine)
Sandoz, Austria
Combithyrex mite (Levothyroxine and Liothyronine)
Sandoz, Austria
Cynoplus (Levothyroxine and Liothyronine)
Grossman, Mexico
Dermocinetic (Levothyroxine and Escin)
Geymonat, Italy
Dexnon
Kern, Spain
Diotroxin (Levothyroxine and Liothyronine)
Aspen Pharmacare, South Africa
Dithyron (Levothyroxine and Liothyronine)
Uni-Pharma, Greece
Eferox
Aristo Pharma, Germany; Hexal, Bahrain
El-Thyro
M.J. Biopharm, Thailand; MJ Biopharm, Myanmar
Elthyrone
Abbott, Belgium; Abbott, Luxembourg
Eltroksin
GlaxoSmithKline, Slovenia
Eltroxin/Thyroxin
Goldshield, Malta
Eltroxin
Alfred Gera, Malta; Aspen, New Zealand; GlaxoSmithKline, Bangladesh; GlaxoSmithKline, Bahrain; GlaxoSmithKline, Colombia; GlaxoSmithKline, Czech Republic; GlaxoSmithKline, Denmark; GlaxoSmithKline, Israel; GlaxoSmithKline, India; GlaxoSmithKline, Lithuania; GlaxoSmithKline, Netherlands; GlaxoSmithKline, Oman; GlaxoSmithKline, Philippines; GlaxoSmithKline, Poland; GlaxoSmithKline, Singapore; GlaxoSmithKline, Thailand; GlaxoSmithKline, Taiwan; GlaxoSmithKline, South Africa; Goldshield, Ireland; Mercury, United Kingdom; Triton Pharma, Canada
Eltroxin-LF
sigma-tau, Switzerland
Esaldox
Recalcine, Chile
Eurolev
Renata, Philippines
Euthyral (Levothyroxine and Liothyronine)
Merck Serono, France
Euthyrox
Elea, Argentina; Merck, Austria; Merck, Belgium; Merck, Bulgaria; Merck, Bahrain; Merck, Brazil; Merck, Switzerland; Merck, Georgia; Merck, Greece; Merck, Croatia (Hrvatska); Merck, Hungary; Merck, Indonesia; Merck, Iceland; Merck, Lithuania; Merck, Netherlands; Merck, Norway; Merck, Philippines; Merck, Serbia; Merck, Sweden; Merck, Singapore; Merck, Slovenia; Merck, Slovakia; Merck, Thailand; Merck, Turkey; Merck, Venezuela; Merck KGaA, Latvia; Merck KGaA, Romania; Merck Pharma, Czech Republic; Merck Serono, China; Merck Serono, Germany; Merck Serono, Malaysia; Merck Serono, Oman; Merck Serono, Russian Federation; Merck Serono, South Africa
Euthyrox N
Merck, Poland
Eutirox
Bracco, Italy; Merck, Chile; Merck, Costa Rica; Merck, Dominican Republic; Merck, Ecuador; Merck, Guatemala; Merck, Honduras; Merck, Mexico; Merck, Nicaragua; Merck, Panama; Merck, Peru; Merck, El Salvador; Merck S.L., Spain; Merck Serono, Portugal
Eutroid L
Pfizer, Peru
Eutroid (Levothyroxine and Liothyronine)
Elea, Argentina; Pfizer, Peru
Eutroxsig
Sigma, Australia
Forthyron (veterinary use)
Albrecht, Germany; Ceva, France; CEVA Vetpharma, Sweden; Eurovet, Austria; Eurovet, Belgium; Eurovet, Netherlands; Eurovet Animal Health, Poland; Eurovet Animal Health B.V., Luxembourg; Eurovet Animal Health BV, United Kingdom; Gräub, Switzerland; Vetcare, Finland
Jaroxin
Jayson, Bangladesh
Jodthyrox (Levothyroxine and Potassium Iodide)
Merck, Austria; Merck, Bulgaria; Merck, Poland; Merck Pharma, Czech Republic; Merck Serono, Germany; Merck Serono, Russian Federation
Karet
Armstrong, Mexico
L Thyroxine SERB
SERB, France
Letrox
Berlin Chemie, Bosnia & Herzegowina; Berlin-Chemie, China; Berlin-Chemie, Czech Republic; Berlin-Chemie, Croatia (Hrvatska); Berlin-Chemie, Hungary; Berlin-Chemie, Poland; Berlin-Chemie, Serbia
Letter
Sanofi-Aventis, Portugal
Levaxin
Nycomed, Norway; Nycomed, Sweden
Leventa (veterinary use)
Intervet, Germany; Intervet, France; Intervet, United Kingdom; Intervet, Poland; Intervet, Sweden; Intervet International B.V., Luxembourg; Veterinaria, Switzerland
Levolet
Hamad, Bahrain
Levothroid
Forest, United States; Sanofi Aventis, Spain
Levothyroid
IFET, Greece
Levothyrox
Merck Sante, Vietnam
Lévothyrox
Merck Serono, France
Levothyroxin (veterinary use)
Ceva, Netherlands
Levothyroxine - ZhongLian Pharm
Zhonglian Pharmaceutical, China
Lévothyroxine Biogaran
Biogaran, France
Levothyroxine Christiaens
Nycomed, Netherlands
Lévothyroxine Ratiopharm
Ratiopharm, France
Levothyroxine Sodium APP
APP, United States
Levothyroxine Sodium
Bedford, United States; Lannett, United States; Merck, United States; Mylan, United States; Sandoz, United States
Levothyroxine
Actavis, United Kingdom; Actavis, Indonesia; Actavis, Malta; APP, Hong Kong; Cherubino, Malta; Clinipharm, Malta; Forley, Malta; Goldshield, New Zealand; Mercury, United Kingdom; P & D, Malta; Pharmaceutical Partners of Canada, Canada; Wockhardt, United Kingdom
Levothyroxine Na
Sandoz, Japan
Levothyroxinum Rup Borisov
Rup Borisov Medical Preparation Plant, Georgia
Levotiron
Abdi Ibrahim, Turkey
Levotiroxina Fabra
Fabra, Argentina
Levotiroxina MK
MK, Colombia
Levotiroxina Northia
Northia, Argentina
Levotiroxina Sodica Andromaco
Andromaco, Chile
Levotiroxina Sodica Colmed
Colmed, Colombia
Levotiroxina Sodica L.CH.
Chile, Chile
Levotiroxina Sodica
GlaxoSmithKline, Argentina
Levotiroxina Sódica
Marfan, Peru; Perugen, Peru
Levotyroxin Nycomed
Nycomed, Sweden
Levoxyl
Jones, United States; King Pharmaceuticals, United States
L-T
Craveri, Argentina
L-Thyrox HEXAL
Hexal, Germany
L-Thyrox Jod HEXAL (Levothyroxine and Potassium Iodide)
Hexal, Germany
L-Thyroxin - 1 A Pharma
1A Pharma, Germany
L-Thyroxin AL
Aliud, Germany
L-Thyroxin Aristo
Aristo Pharma, Germany
L-Thyroxin Berlin-Chemie
Berlin-Chemie, Bulgaria; Berlin-Chemie, Estonia; Berlin-Chemie, Georgia; Berlin-Chemie, Lithuania; Berlin-Chemie, Latvia
L-Thyroxin beta
Betapharm, Germany
L-Thyroxin Farmak
Farmak, Georgia
L-Thyroxin Henning
Henning Berlin, Germany; Sanofi-Aventis, Austria; Sanofi-Aventis, Germany; Sanofi-Aventis, Hungary; Winthrop, Germany
L-Thyroxin Jod - 1A-Pharma (Levothyroxine and Potassium Iodide)
1A Pharma, Germany
L-Thyroxin
Berlin-Chemie, Romania; Berlin-Chemie, Slovakia
L-Thyroxin-CT
CT Arzneimittel, Germany
L-Thyroxine Sandoz
Sandoz, Lithuania
L-Thyroxine
Nycomed, Belgium
L-Thyroxine (veterinary use)
Aesculaap, Netherlands
L-Thyroxin-ratiopharm
Ratiopharm, Germany
Lucentis
Berlin-Chemie, Latvia
Medithyrox
Intermed, Greece
Meprobamate
InvaGen, United States
Nei Zhang Qing (Levothyroxine and Liothyronine)
Wujing Medicine, China
Novothyral
Merck, Austria
Novothyral (Levothyroxine and Liothyronine)
Merck, Switzerland; Merck, Poland; Merck KGaA, Romania; Merck Serono, Germany
Novotiral (Levothyroxine and Liothyronine)
Merck, Mexico
Oroxine
GlaxoSmithKline, Malaysia; Sigma, Australia
Pondtroxin
Pond's Chemical, Thailand
Prothyrid (Levothyroxine and Liothyronine)
Henning Berlin, Germany; Sanofi-Aventis, Germany
Puran T4
Sanofi Aventis, Brazil
Soloxine (veterinary use)
Virbac, United Kingdom
Synthroid
Abbott, Brazil; Abbott, Canada; Abbott, Chile; Abbott, Colombia; Abbott, New Zealand; Abbott, Philippines; Abbott, United States
Synthyroid
Bu Kwang, South Korea
Syntroxine
IBSA Farmaceutici Italia, Italy
T4
Montpellier, Argentina; Uni-Pharma, Greece
T4-Bago
Bago, Chile
Tefor
Schering-Plough, Turkey
Thyrax Duotab
Organon, Netherlands
Thyrax
Organon, Indonesia; Organon, Philippines; Organon, Venezuela; Schering-Plough, Portugal
Thyrex
Sandoz, Austria
Thyrin
Square, Bangladesh
Thyro-4
Faran, Romania; Faran Laboratories, Greece
Thyrobest
Bestochem, India
Thyrohormone
Ni-The, Greece
Thyrolar (Levothyroxine and Liothyronine)
Forest, United States
Thyronajod (Levothyroxine and Potassium Iodide)
Henning Berlin, Germany; Sanofi-Aventis, Germany
Thyronorm
Abbott, India
Thyrosit
Sriprasit Dispensary, Thailand
Thyrowin
Abbott, India
Thyroxin
Orion, Finland
Thyroxine (veterinary use)
Apex Laboratories, Australia
Thyroxine-Lam Thong
Lam Thong, Thailand
Thyroxyl (veterinary use)
Dechra, United Kingdom
Tigofar
Farqui, Dominican Republic
Tiracrin
Geymonat, Italy
Tirosint
IBSA, Switzerland; IBSA Farmaceutici Italia, Italy
Tiroxin
Metlen, Colombia
Tivoral
Galenika, Serbia
Unithroid
Watson, United States
You Xian
Kangpu Pharmaceutical, China
Ze Ning
Sichuan Hairong Pharmaceutical Co., Ltd, China
Berlthyrox
Berlin-Chemie, Germany
Eferox Jod (Levothyroxine and Potassium Iodide)
Aristo Pharma, Germany
L-Thyroxin Henning plus (Levothyroxine and Potassium Iodide)
Henning Berlin, Germany; Sanofi-Aventis, Germany
L-Thyroxin Jod Aristo (Levothyroxine and Potassium Iodide)
Aristo Pharma, Germany
Thevier
Aspen, Germany

International Drug Name Search

Glossary

Term	Definition
BAN	British Approved Name
BANM	British Approved Name (Modified)
DCF	Dénomination Commune Française
DCIT	Denominazione Comune Italiana
IS	Inofficial Synonym
JAN	Japanese Accepted Name
OS	Official Synonym
PH	Pharmacopoeia Name

Click for further information on drug naming conventions and International Nonproprietary Names.

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