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Synopsis

Chemistry

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Also known as: 25416-65-3, Levothyroxine sodium, L-thyroxine sodium xhydrate, Levothyroxine sodium hydrate, L-thyroxine sodium hydrate, Monosodium l-thyroxine hydrate
Molecular Formula
C15H12I4NNaO5
Molecular Weight
816.87  g/mol
InChI Key
ANMYAHDLKVNJJO-LTCKWSDVSA-M
FDA UNII
B82379R9W0

Thyroxine
The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism.
1 2D Structure

Thyroxine

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
sodium;(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate;hydrate
2.1.2 InChI
InChI=1S/C15H11I4NO4.Na.H2O/c16-8-4-7(5-9(17)13(8)21)24-14-10(18)1-6(2-11(14)19)3-12(20)15(22)23;;/h1-2,4-5,12,21H,3,20H2,(H,22,23);;1H2/q;+1;/p-1/t12-;;/m0../s1
2.1.3 InChI Key
ANMYAHDLKVNJJO-LTCKWSDVSA-M
2.1.4 Canonical SMILES
C1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)CC(C(=O)[O-])N.O.[Na+]
2.1.5 Isomeric SMILES
C1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)C[C@@H](C(=O)[O-])N.O.[Na+]
2.2 Other Identifiers
2.2.1 UNII
B82379R9W0
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 3,5,3',5'-tetraiodothyronine

2. Berlthyrox

3. Dexnon

4. Eferox

5. Eltroxin

6. Eltroxine

7. Euthyrox

8. Eutirox

9. L Thyrox

10. L Thyroxin Beta

11. L Thyroxin Henning

12. L Thyroxine

13. L Thyroxine Roche

14. L-3,5,3',5'-tetraiodothyronine

15. L-thyrox

16. L-thyroxin Beta

17. L-thyroxin Henning

18. L-thyroxine

19. L-thyroxine Roche

20. Lvothyrox

21. Levo T

22. Levo-t

23. Levothroid

24. Levothyroid

25. Levothyroxin Deladande

26. Levothyroxin Delalande

27. Levothyroxine

28. Levothyroxine Sodium

29. Levoxine

30. Levoxyl

31. Novothyral

32. Novothyrox

33. O-(4-hydroxy-3,5-diiodophenyl) 3,5-diiodo-l-tyrosine

34. O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodotyrosine

35. Oroxine

36. Sodium Levothyroxine

37. Synthroid

38. Synthrox

39. T4 Thyroid Hormone

40. Thevier

41. Thyrax

42. Thyroid Hormone, T4

43. Thyroxin

44. Thyroxine

45. Tiroidine

46. Tiroxina Leo

47. Unithroid

2.3.2 Depositor-Supplied Synonyms

1. 25416-65-3

2. Levothyroxine Sodium

3. L-thyroxine Sodium Xhydrate

4. Levothyroxine Sodium Hydrate

5. L-thyroxine Sodium Hydrate

6. Monosodium L-thyroxine Hydrate

7. 31178-59-3

8. Chebi:6447

9. Levothroid

10. Synthroid

11. Levothyrox

12. Levaxin

13. Levoxyl

14. Oroxine

15. Soloxine

16. Eferox

17. Sodium;(2s)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate;hydrate

18. B82379r9w0

19. Thyroxine Sodium

20. Levo-t

21. Liotrix (t4)

22. Thyroxine Sodium Salt

23. L-tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, Monosodium Salt, Monohydrate

24. Latequatro

25. Letequatro

26. Levoroxin

27. Levotiron

28. Tiroxina

29. Tivoral

30. Levo-tiroxina Glaxo

31. Nsc-259940

32. L-tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, Monosodium Salt, Hydrate

33. Unii-b82379r9w0

34. Levothroid (tn)

35. Synthroid (tn)

36. Levoxyl (tn)

37. Levothyroxine Sodium [usp:inn:jan]

38. Starbld0009614

39. L-thyroxin Monosodium Salt

40. T4 (liotrix)

41. Levothyroxine Sodium (usp)

42. Schembl2327406

43. Chembl2103741

44. L-thyroxine Sodium Salt Monohydrate

45. 3,3',5,5'-tetraiodo-l-thyronine Monosodium Salt Hydrate

46. Levothyroxine Sodium Hydrate (jp17)

47. Mfcd06408007

48. Akos015895962

49. Ks-1237

50. D01010

51. E78443

52. Levothyroxine Sodium Monohydrate [who-ip]

53. 3,3',5,5'-tetraiodo-l-thyronine Monosodium Salt

54. A817851

55. Q27107209

56. Levothyroxinum Natricum Monohydrate [who-ip Latin]

57. Sodium 2-amino-3-[4-(4-hydroxy-3,5-diiodo-phenoxy)-3,5-diiodo-phenyl]propanoate Hydrate

58. Sodium (s)-2-amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate Xhydrate

2.4 Create Date
2008-02-05
3 Chemical and Physical Properties
Molecular Weight 816.87 g/mol
Molecular Formula C15H12I4NNaO5
Hydrogen Bond Donor Count3
Hydrogen Bond Acceptor Count6
Rotatable Bond Count5
Exact Mass816.6792 g/mol
Monoisotopic Mass816.6792 g/mol
Topological Polar Surface Area96.6 Ų
Heavy Atom Count26
Formal Charge0
Complexity426
Isotope Atom Count0
Defined Atom Stereocenter Count1
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count3
4 Drug and Medication Information
4.1 Drug Information
1 of 8  
Drug NameLevo-t
Drug LabelLevothyroxine 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 empir
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyAlara Pharm

2 of 8  
Drug NameLevothroid
PubMed HealthThyroid Supplement (By mouth)
Drug ClassesDiagnostic Agent, Thyroid Function, Thyroid Supplement
Drug LabelLEVOTHROID (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) sodiu
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyLloyd

3 of 8  
Drug NameLevothyroxine sodium
Active IngredientLevothyroxine sodium
Dosage FormTablet; Powder; Injectable
Routeinjection; Oral; Intravenous
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 200mcg/vial; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 descr
Market StatusPrescription
CompanyFresenius Kabi Usa; Mylan

4 of 8  
Drug NameLevoxyl
Drug LabelLEVOXYL (levothyroxine sodium tablets, USP) 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) sodiu...
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyKing Pharms R And D

5 of 8  
Drug NameLevo-t
Drug LabelLevothyroxine 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 empir
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyAlara Pharm

6 of 8  
Drug NameLevothroid
PubMed HealthThyroid Supplement (By mouth)
Drug ClassesDiagnostic Agent, Thyroid Function, Thyroid Supplement
Drug LabelLEVOTHROID (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) sodiu
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyLloyd

7 of 8  
Drug NameLevothyroxine sodium
Active IngredientLevothyroxine sodium
Dosage FormTablet; Powder; Injectable
Routeinjection; Oral; Intravenous
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 200mcg/vial; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 descr
Market StatusPrescription
CompanyFresenius Kabi Usa; Mylan

8 of 8  
Drug NameLevoxyl
Drug LabelLEVOXYL (levothyroxine sodium tablets, USP) 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) sodiu...
Active IngredientLevothyroxine sodium
Dosage FormTablet
RouteOral
Strength0.05mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.112mg **see current annual edition, 1.8 description of special situations, levothyroxine sodium; 0.2mg **see current annual edition, 1.8 description of spe
Market StatusPrescription
CompanyKing Pharms R And D

5 Pharmacology and Biochemistry
5.1 FDA Pharmacological Classification
5.1.1 Pharmacological Classes
l-Thyroxine [EPC]; Thyroxine [CS]
5.2 ATC Code

H - Systemic hormonal preparations, excl. sex hormones and insulins

H03 - Thyroid therapy

H03A - Thyroid preparations

H03AA - Thyroid hormones

H03AA01 - Levothyroxine sodium


USDMF

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DMF Review : Complete

Rev. Date : 2014-06-23

Pay. Date : 2013-09-26

DMF Number : 24402

Submission : 2011-10-20

Status : Active

Type : II

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DMF Review : N/A

Rev. Date :

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DMF Number : 30113

Submission : 2016-03-01

Status : Inactive

Type : II

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DMF Number : 25818

Submission : 2012-02-20

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DMF Review : Complete

Rev. Date : 2015-07-10

Pay. Date : 2015-05-05

DMF Number : 29098

Submission : 2015-03-14

Status : Active

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Gland Pharma Ltd

India

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DMF Review : Complete

Rev. Date : 2015-09-25

Pay. Date : 2015-08-17

DMF Number : 29550

Submission : 2015-07-27

Status : Active

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Lupin Ltd

India

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Peptido Gmbh

Germany

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Peptido Gmbh

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DMF Review : Complete

Rev. Date : 2013-01-30

Pay. Date : 2013-01-15

DMF Number : 14715

Submission : 2000-02-01

Status : Active

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DMF Review : N/A

Rev. Date :

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DMF Number : 14256

Submission : 1999-06-29

Status : Inactive

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Sandoz Gmbh

Switzerland

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Sandoz Gmbh

Switzerland
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DMF Review : Complete

Rev. Date : 2013-01-15

Pay. Date : 2012-12-21

DMF Number : 4789

Submission : 1983-01-06

Status : Active

Type : II

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Azeo Processing Inc

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Azeo Processing Inc

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DMF Review : N/A

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DMF Number : 7374

Submission : 1988-03-07

Status : Inactive

Type : II

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CEP 2011-315 - Rev 02
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Chemical
2023-11-08
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Certificate Number : CEP 2011-315 - Rev 02

Status : Valid

Issue Date : 2023-11-08

Type : Chemical

Substance Number : 401

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Certificate Number : R0-CEP 2019-190 - Rev 01

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Issue Date : 2023-05-31

Type : Chemical

Substance Number : 401

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Certificate Number : R1-CEP 2016-280 - Rev 01

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Issue Date : 2023-05-26

Type : Chemical

Substance Number : 401

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Certificate Number : CEP 2023-227 - Rev 00

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Substance Number : 401

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Substance Number : 401

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Certificate Number : R1-CEP 1998-048 - Rev 06

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Substance Number : 401

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Certificate Number : CEP 1998-141 - Rev 11

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Issue Date : 2023-09-26

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Substance Number : 401

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Drugs in Development

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Details:

Jerome acquires Thyquidity (levothyroxine sodium) from Azurity. It is indicated for the treatment of Hypothyroidism.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Endocrinology Brand Name: Thyquidity

Study Phase: Approved FDFProduct Type: Hormone

Sponsor: Jerome Stevens Pharmaceuticals

Deal Size: Undisclosed Upfront Cash: Undisclosed

Deal Type: Acquisition April 01, 2025

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AACR Annual meeting
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Details : Jerome acquires Thyquidity (levothyroxine sodium) from Azurity. It is indicated for the treatment of Hypothyroidism.

Product Name : Thyquidity

Product Type : Hormone

Upfront Cash : Undisclosed

April 01, 2025

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  • Development Update

Details:

Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase II/ phase III clinical studies for the treatment of Hypothyroidism.


Lead Product(s): Thyroxine,Liothyronine Sodium

Therapeutic Area: Endocrinology Brand Name: Undisclosed

Study Phase: Phase II/ Phase IIIProduct Type: Amino Acid

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable December 12, 2024

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02

UConn Health

Country
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UConn Health

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Details : Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase II/ phase III clinical studies for the treatment of Hypothyroidism.

Product Name : Undisclosed

Product Type : Amino Acid

Upfront Cash : Inapplicable

December 12, 2024

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Details:

Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase I clinical studies for the treatment of undefined medical condition.


Lead Product(s): Thyroxine,Enlicitide Decanoate

Therapeutic Area: Undisclosed Brand Name: Undisclosed

Study Phase: Phase IProduct Type: Amino Acid

Sponsor: Celerion

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable October 03, 2024

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Merck & Co

U.S.A
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Merck & Co

U.S.A
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Details : Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase I clinical studies for the treatment of undefined medical condition.

Product Name : Undisclosed

Product Type : Amino Acid

Upfront Cash : Inapplicable

October 03, 2024

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Details:

Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase I clinical studies for the treatment of undefined medical condition.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Undisclosed Brand Name: Undisclosed

Study Phase: Phase IProduct Type: Amino Acid

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable August 09, 2024

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04

Berlin Chemie

Germany
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Berlin Chemie

Germany
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Details : Levothyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase I clinical studies for the treatment of undefined medical condition.

Product Name : Undisclosed

Product Type : Amino Acid

Upfront Cash : Inapplicable

August 09, 2024

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Details:

XP-8121 (levothyroxine) is a Investigational hormome, administered via Subcutaneous injection for the treatment of acquired thyroid disease.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Endocrinology Brand Name: Undisclosed

Study Phase: Phase IIProduct Type: Hormone

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable May 30, 2024

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05

AACR Annual meeting
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AACR Annual meeting
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Details : XP-8121 (levothyroxine) is a Investigational hormome, administered via Subcutaneous injection for the treatment of acquired thyroid disease.

Product Name : Undisclosed

Product Type : Hormone

Upfront Cash : Inapplicable

May 30, 2024

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  • Development Update

Details:

L-Thyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase IV clinical studies for the treatment of Levothyroxine.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Undisclosed Brand Name: Undisclosed

Study Phase: Phase IVProduct Type: Amino Acid

Sponsor: University of Sharjah

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable November 18, 2023

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Emirates Health Services

Country
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Emirates Health Services

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Lead Product(s) : Thyroxine,Inapplicable

Therapeutic Area : Undisclosed

Highest Development Status : Phase IV

Partner/Sponsor/Collaborator : University of Sharjah

Deal Size : Inapplicable

Deal Type : Inapplicable

Details : L-Thyroxine is a Other Small Molecule drug candidate, which is currently being evaluated in phase IV clinical studies for the treatment of Levothyroxine.

Product Name : Undisclosed

Product Type : Amino Acid

Upfront Cash : Inapplicable

November 18, 2023

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Details:

XP-8121 (levothyroxine) is a Investigational Subcutaneous injection thus indicated for acquired thyroid disease (primary hypothyroidism), in cases of decreased secretion of TSH from the anterior pituitary gland (secondary hypothyroidism),


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Endocrinology Brand Name: Undisclosed

Study Phase: Phase IIProduct Type: Hormone

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable June 21, 2023

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07

AACR Annual meeting
Not Confirmed
AACR Annual meeting
Not Confirmed

Details : XP-8121 (levothyroxine) is a Investigational Subcutaneous injection thus indicated for acquired thyroid disease (primary hypothyroidism), in cases of decreased secretion of TSH from the anterior pituitary gland (secondary hypothyroidism),

Product Name : Undisclosed

Product Type : Hormone

Upfront Cash : Inapplicable

June 21, 2023

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Details:

Levothyroxine Sodium is a Hormone drug candidate, which is currently being evaluated in phase II clinical studies for the treatment of Hypothyroidism.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Endocrinology Brand Name: Undisclosed

Study Phase: Phase IIProduct Type: Hormone

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable April 21, 2023

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08

AACR Annual meeting
Not Confirmed
AACR Annual meeting
Not Confirmed

Details : Levothyroxine Sodium is a Hormone drug candidate, which is currently being evaluated in phase II clinical studies for the treatment of Hypothyroidism.

Product Name : Undisclosed

Product Type : Hormone

Upfront Cash : Inapplicable

April 21, 2023

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Details:

Levothyroxine sodium is a medicine used to treat an underactive thyroid gland (hypothyroidism). The thyroid gland makes thyroid hormones which help to control energy levels and growth. Levothyroxine is taken to replace the missing thyroid hormone thyroxine.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Rare Diseases and Disorders Brand Name: Levothyroxine Sodium-Generic

Study Phase: Approved FDFProduct Type: Hormone

Sponsor: Undisclosed

Deal Size: Inapplicable Upfront Cash: Inapplicable

Deal Type: Inapplicable March 28, 2023

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AACR Annual meeting
Not Confirmed
AACR Annual meeting
Not Confirmed

Details : Levothyroxine sodium is a medicine used to treat an underactive thyroid gland (hypothyroidism). The thyroid gland makes thyroid hormones which help to control energy levels and growth. Levothyroxine is taken to replace the missing thyroid hormone thyroxi...

Product Name : Levothyroxine Sodium-Generic

Product Type : Hormone

Upfront Cash : Inapplicable

March 28, 2023

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Details:

Tirosint capsules is the leading branded gel capsule formulation of levothyroxine sodium in the US. It is formulated without excipients that can cause tolerability and drug absorption problems commonly observed with traditional levothyroxine tablet therapies.


Lead Product(s): Thyroxine,Inapplicable

Therapeutic Area: Endocrinology Brand Name: Tirosint

Study Phase: Approved FDFProduct Type: Hormone

Sponsor: Mark Cuban Cost Plus Drug Company

Deal Size: Undisclosed Upfront Cash: Undisclosed

Deal Type: Agreement March 07, 2023

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10

AACR Annual meeting
Not Confirmed
AACR Annual meeting
Not Confirmed

Lead Product(s) : Thyroxine,Inapplicable

Therapeutic Area : Endocrinology

Highest Development Status : Approved FDF

Partner/Sponsor/Collaborator : Mark Cuban Cost Plus Drug Company

Deal Size : Undisclosed

Deal Type : Agreement

Details : Tirosint capsules is the leading branded gel capsule formulation of levothyroxine sodium in the US. It is formulated without excipients that can cause tolerability and drug absorption problems commonly observed with traditional levothyroxine tablet thera...

Product Name : Tirosint

Product Type : Hormone

Upfront Cash : Undisclosed

March 07, 2023

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DRUG PRODUCT COMPOSITIONS

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DOSAGE - TABLET;ORAL - 0.0125MG;0.0031MG

USFDA APPLICATION NUMBER - 16807

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DOSAGE - TABLET;ORAL - 0.025MG;0.0063MG

USFDA APPLICATION NUMBER - 16807

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DOSAGE - TABLET;ORAL - 0.05MG;0.0125MG

USFDA APPLICATION NUMBER - 16807

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DOSAGE - TABLET;ORAL - 0.15MG;0.0375MG

USFDA APPLICATION NUMBER - 16807

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DOSAGE - TABLET;ORAL - 0.1MG;0.025MG

USFDA APPLICATION NUMBER - 16807

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DOSAGE - POWDER;INTRAVENOUS - 100MCG/VIAL

USFDA APPLICATION NUMBER - 202231

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DOSAGE - POWDER;INTRAVENOUS - 200MCG/VIAL

USFDA APPLICATION NUMBER - 202231

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DOSAGE - POWDER;INTRAVENOUS - 500MCG/VIAL

USFDA APPLICATION NUMBER - 202231

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DOSAGE - TABLET;ORAL - 0.025MG **See current ...DOSAGE - TABLET;ORAL - 0.025MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.05MG **See current A...DOSAGE - TABLET;ORAL - 0.05MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.075MG **See current ...DOSAGE - TABLET;ORAL - 0.075MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.088MG **See current ...DOSAGE - TABLET;ORAL - 0.088MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.112MG **See current ...DOSAGE - TABLET;ORAL - 0.112MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.125MG **See current ...DOSAGE - TABLET;ORAL - 0.125MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.137MG **See current ...DOSAGE - TABLET;ORAL - 0.137MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.15MG **See current A...DOSAGE - TABLET;ORAL - 0.15MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.175MG **See current ...DOSAGE - TABLET;ORAL - 0.175MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.1MG **See current An...DOSAGE - TABLET;ORAL - 0.1MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.2MG **See current An...DOSAGE - TABLET;ORAL - 0.2MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.3MG **See current An...DOSAGE - TABLET;ORAL - 0.3MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21116

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DOSAGE - TABLET;ORAL - 0.025MG **See current ...DOSAGE - TABLET;ORAL - 0.025MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.05MG **See current A...DOSAGE - TABLET;ORAL - 0.05MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.075MG **See current ...DOSAGE - TABLET;ORAL - 0.075MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.088MG **See current ...DOSAGE - TABLET;ORAL - 0.088MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.112MG **See current ...DOSAGE - TABLET;ORAL - 0.112MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.125MG **See current ...DOSAGE - TABLET;ORAL - 0.125MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.137MG **See current ...DOSAGE - TABLET;ORAL - 0.137MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.15MG **See current A...DOSAGE - TABLET;ORAL - 0.15MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.175MG **See current ...DOSAGE - TABLET;ORAL - 0.175MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.1MG **See current An...DOSAGE - TABLET;ORAL - 0.1MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.2MG **See current An...DOSAGE - TABLET;ORAL - 0.2MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.3MG **See current An...DOSAGE - TABLET;ORAL - 0.3MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21210

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DOSAGE - TABLET;ORAL - 0.025MG **See current ...DOSAGE - TABLET;ORAL - 0.025MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.05MG **See current A...DOSAGE - TABLET;ORAL - 0.05MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.075MG **See current ...DOSAGE - TABLET;ORAL - 0.075MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.088MG **See current ...DOSAGE - TABLET;ORAL - 0.088MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.112MG **See current ...DOSAGE - TABLET;ORAL - 0.112MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.125MG **See current ...DOSAGE - TABLET;ORAL - 0.125MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.137MG **See current ...DOSAGE - TABLET;ORAL - 0.137MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.15MG **See current A...DOSAGE - TABLET;ORAL - 0.15MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.175MG **See current ...DOSAGE - TABLET;ORAL - 0.175MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.1MG **See current An...DOSAGE - TABLET;ORAL - 0.1MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.2MG **See current An...DOSAGE - TABLET;ORAL - 0.2MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - TABLET;ORAL - 0.3MG **See current An...DOSAGE - TABLET;ORAL - 0.3MG **See current Annual Edition, 1.8 Description of Special Situations, Levothyroxine Sodium

USFDA APPLICATION NUMBER - 21402

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DOSAGE - CAPSULE;ORAL - 0.013MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.025MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.0375MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.044MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.05MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.0625MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.075MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.088MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.112MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.125MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.137MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.15MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.175MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.1MG

USFDA APPLICATION NUMBER - 21924

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DOSAGE - CAPSULE;ORAL - 0.2MG

USFDA APPLICATION NUMBER - 21924

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FDA’s December 2025 OPOE list features 784 prescription drugs, 73 OTC drugs
This week, PharmaCompass brings you key highlights of the US Food and Drug Administration’s December 2025 list of Off-Patent, Off-Exclusivity Drugs (OPOE) without an approved generic. The OPOE list gets updated every six months.This list highlights drug products that have lost patent protection and regulatory exclusivity, but remain without approved generic competition in the US market. With this list, the FDA hopes to bolster competitiveness in the generics market, improve transparency and encourage the development and submission of abbreviated new drug applications (ANDAs) in markets with little competition.Since December 2021, FDA has been publishing two versions of the OPOE list — one for prescription (Rx) drug products and the other for over-the-counter (OTC) drug products that are approved and marketed under a new drug approval (NDA).  Access the Interactive Dashboard on FDA's December 2025 List of OPOE Drugs (Free Excel)Injectables continue to dominate FDA’s OPOE Rx list; 73 OTC drugs figure in Dec listFDA’s December 2025 OPOE Rx list includes 784 drug products that currently have no approved generics. Out of these, 296 are injectables and 126 are oral solid dosage forms (such as tablets, capsules and modified release forms). In June 2025, the OPOE Rx list had 765 drug products without an approved generic, out of which 304 were injectables, while 109 were oral solid drug forms. The increase in drug products from 765 to 784 from June 2025 to December 2025 was due to the inclusion of additional dosage strengths in the OPOE Rx list. Otherwise, no new drugs were added to the December 2025 OPOE Rx list.The December 2025 OPOE list has 73 OTC drugs, slightly higher than the 69 drugs in the June 2025 list. Among the 73, 21 are oral solid dosage forms.Among the OTC drugs on the December 2025 OPOE list are ibuprofen and ibuprofen sodium (for pain and inflammation), pseudoephedrine hydrochloride and phenylephrine hydrochloride (nasal decongestants), nizatidine and famotidine (for gastroesophageal reflux disease), loratadine, cetirizine hydrochloride and chlorpheniramine maleate (for allergy relief), loperamide hydrochloride (anti-diarrheal), and orlistat (for weight management). Access the Interactive Dashboard on FDA's December 2025 List of OPOE Drugs (Free Excel)FDA fast-tracks initiatives to accelerate market entry of generics, biosimilarsFDA has launched several regulatory initiatives designed to accelerate the market entry of generics and biosimilars. In October 2025, the agency announced a new pilot prioritization program for the review of ANDAs that aims to encourage and reward investment in drug manufacturing, research and development and strengthen the pharmaceutical supply chain in the United States.Separately, FDA has also come out with a new draft guidance that seeks to simplify biosimilarity studies and reduce unnecessary clinical testing. Through a separate initiative, the agency also plans to make it easier for biosimilars to be developed as interchangeable with brand-name biologics, thereby helping patients and pharmacists choose lower-cost options. Access the Interactive Dashboard on FDA's December 2025 List of OPOE Drugs (Free Excel) Our viewThe global generic drugs market was valued at US$ 445.62 billion in 2024 and is projected to reach US$ 728.64 billion by 2034, growing at a compound annual growth rate of 5.04 percent from 2025 to 2034. With several diabetes, immunology, oncology and cardiology drugs slated to face patent expirations this year, and continued pressure on drugmakers to improve affordability, we believe the generic market could grow at an even faster rate in the near term.

Impressions: 2922

https://www.pharmacompass.com/radio-compass-blog/fda-s-december-2025-opoe-list-features-784-prescription-drugs-73-otc-drugs

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22 Jan 2026

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ABOUT THIS PAGE

Looking for 31178-59-3 / Thyroxine API manufacturers, exporters & distributors?

Thyroxine manufacturers, exporters & distributors 1

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PharmaCompass offers a list of Thyroxine API manufacturers, exporters & distributors, which can be sorted by GMP, USDMF, JDMF, KDMF, CEP (COS), WC, and more, enabling you to easily find the right Thyroxine manufacturer or Thyroxine supplier for your needs.

Send us enquiries for free, and we will assist you in establishing a direct connection with your preferred Thyroxine manufacturer or Thyroxine supplier.

API | Excipient name

Thyroxine

Synonyms

25416-65-3, Levothyroxine sodium, L-thyroxine sodium xhydrate, Levothyroxine sodium hydrate, L-thyroxine sodium hydrate, Monosodium l-thyroxine hydrate

Cas Number

31178-59-3

Unique Ingredient Identifier (UNII)

B82379R9W0

About Thyroxine

The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism.

Synthrox Manufacturers

A Synthrox manufacturer is defined as any person or entity involved in the manufacture, preparation, processing, compounding or propagation of Synthrox, including repackagers and relabelers. The FDA regulates Synthrox manufacturers to ensure that their products comply with relevant laws and regulations and are safe and effective to use. Synthrox API Manufacturers are required to adhere to Good Manufacturing Practices (GMP) to ensure that their products are consistently manufactured to meet established quality criteria.

click here to find a list of Synthrox manufacturers with USDMF, JDMF, KDMF, CEP, GMP, and COA related information on PhamaCompass.

Synthrox Suppliers

A Synthrox supplier is an individual or a company that provides Synthrox active pharmaceutical ingredient (API) or Synthrox finished formulations upon request. The Synthrox suppliers may include Synthrox API manufacturers, exporters, distributors and traders.

click here to find a list of Synthrox suppliers with USDMF, JDMF, KDMF, CEP, GMP, and COA related information on PharmaCompass.

Synthrox USDMF

A Synthrox DMF (Drug Master File) is a document detailing the whole manufacturing process of Synthrox active pharmaceutical ingredient (API) in detail. Different forms of Synthrox DMFs exist exist since differing nations have different regulations, such as Synthrox USDMF, ASMF (EDMF), JDMF, CDMF, etc.

A Synthrox DMF submitted to regulatory agencies in the US is known as a USDMF. Synthrox USDMF includes data on Synthrox's chemical properties, information on the facilities and procedures used, and details about packaging and storage. The Synthrox USDMF is kept confidential to protect the manufacturer’s intellectual property.

click here to find a list of Synthrox suppliers with USDMF on PharmaCompass.

Synthrox JDMF

The Pharmaceuticals and Medical Devices Agency (PMDA) established the Japan Drug Master File (JDMF), also known as the Master File (MF), to permit Japanese and foreign manufacturers of drug substances, intermediates, excipients, raw materials, and packaging materials (‘Products’) to voluntarily register confidential information about the production and management of their products in Japan.

The Synthrox Drug Master File in Japan (Synthrox JDMF) empowers Synthrox API manufacturers to present comprehensive information (e.g., production methods, data, etc.) to the review authority, i.e., PMDA (Pharmaceuticals & Medical Devices Agency).

PMDA reviews the Synthrox JDMF during the approval evaluation for pharmaceutical products. At the time of Synthrox JDMF registration, PMDA checks if the format is accurate, if the necessary items have been included (application), and if data has been attached.

click here to find a list of Synthrox suppliers with JDMF on PharmaCompass.

Synthrox KDMF

In Korea, the Ministry of Food and Drug Safety (MFDS) is in charge of regulating pharmaceutical products and services.

Pharmaceutical companies submit a Synthrox Drug Master File in Korea (Synthrox KDMF) to the MFDS, which includes comprehensive information about the production, processing, facilities, materials, packaging, and testing of Synthrox. The MFDS reviews the Synthrox KDMF as part of the drug registration process and uses the information provided in the Synthrox KDMF to evaluate the safety and efficacy of the drug.

After submitting a Synthrox KDMF to the MFDS, the registered manufacturer can provide importers or distributors with the registration number without revealing confidential information to Korean business partners. Applicants seeking to register their Synthrox API can apply through the Korea Drug Master File (KDMF).

click here to find a list of Synthrox suppliers with KDMF on PharmaCompass.

Synthrox CEP

A Synthrox CEP of the European Pharmacopoeia monograph is often referred to as a Synthrox Certificate of Suitability (COS). The purpose of a Synthrox CEP is to show that the European Pharmacopoeia monograph adequately controls the purity of Synthrox EP produced by a given manufacturer. Suppliers of raw materials can prove the suitability of Synthrox to their clients by showing that a Synthrox CEP has been issued for it. The manufacturer submits a Synthrox CEP (COS) as part of the market authorization procedure, and it takes on the role of a Synthrox CEP holder for the record. Additionally, the data presented in the Synthrox CEP (COS) is managed confidentially and offers a centralized system acknowledged by numerous nations, exactly like the Synthrox DMF.

A Synthrox CEP (COS) is recognised by all 36 nations that make up the European Pharmacopoeia Convention. Synthrox CEPs may be accepted in nations that are not members of the Ph. Eur. at the discretion of the authorities there.

click here to find a list of Synthrox suppliers with CEP (COS) on PharmaCompass.

Synthrox WC

A Synthrox written confirmation (Synthrox WC) is an official document issued by a regulatory agency to a Synthrox manufacturer, verifying that the manufacturing facility of a Synthrox active pharmaceutical ingredient (API) adheres to the Good Manufacturing Practices (GMP) regulations of the importing country. When exporting Synthrox APIs or Synthrox finished pharmaceutical products to another nation, regulatory agencies frequently require a Synthrox WC (written confirmation) as part of the regulatory process.

click here to find a list of Synthrox suppliers with Written Confirmation (WC) on PharmaCompass.

Synthrox NDC

National Drug Code is a comprehensive database maintained by the FDA that contains information on all drugs marketed in the US. This directory includes information about finished drug products, unfinished drug products, and compounded drug products, including those containing Synthrox as an active pharmaceutical ingredient (API).

Finished drug products

The FDA updates the NDC directory daily. The NDC numbers for Synthrox API and other APIs are published in this directory by the FDA.

Unfinished drugs

The NDC unfinished drugs database includes product listing information submitted for all unfinished drugs, such as active pharmaceutical ingredients (APIs), drugs intended for further processing and bulk drug substances for compounding.

Pharmaceutical companies that manufacture Synthrox as an active pharmaceutical ingredient (API) must furnish the FDA with an updated record of all drugs that they produce, prepare, propagate, compound, or process for commercial distribution in the US at their facilities.

Compounded drug products

The NDC directory also contains data on finished compounded human drug products that contain Synthrox and are produced by outsourcing facilities. While these outsourcing facilities are not mandated to assign a Synthrox NDC to their finished compounded human drug products, they may choose to do so.

click here to find a list of Synthrox suppliers with NDC on PharmaCompass.

Synthrox GMP

Synthrox Active pharmaceutical ingredient (API) is produced in GMP-certified manufacturing facility.

GMP stands for Good Manufacturing Practices, which is a system used in the pharmaceutical industry to make sure that goods are regularly produced and monitored in accordance with quality standards. The FDA’s current Good Manufacturing Practices requirements are referred to as cGMP or current GMP which indicates that the company follows the most recent GMP specifications. The World Health Organization (WHO) has its own set of GMP guidelines, called the WHO GMP. Different countries can also set their own guidelines for GMP like China (Chinese GMP) or the EU (EU GMP).

PharmaCompass offers a list of Synthrox GMP manufacturers, exporters & distributors, which can be sorted by USDMF, JDMF, KDMF, CEP (COS), WC, and more, enabling you to easily find the right Synthrox GMP manufacturer or Synthrox GMP API supplier for your needs.

Synthrox CoA

A Synthrox CoA (Certificate of Analysis) is a formal document that attests to Synthrox's compliance with Synthrox specifications and serves as a tool for batch-level quality control.

Synthrox CoA mostly includes findings from lab analyses of a specific batch. For each Synthrox CoA document that a company creates, the USFDA specifies specific requirements, such as supplier information, material identification, transportation data, evidence of conformity and signature data.

Synthrox may be tested according to a variety of international standards, such as European Pharmacopoeia (Synthrox EP), Synthrox JP (Japanese Pharmacopeia) and the US Pharmacopoeia (Synthrox USP).

Inform the supplier about your product requirements, specifying if you need a product with particular monograph like EP (Ph. Eur.), USP, JP, BP, or any other quality. In addition, clarify whether you need hydrochloride (HCl), anhydricum, base, micronisatum or a specific level of purity. To find reputable suppliers, utilize the filters and select those certified by GMP, FDA, or any other certification as per your requirement.
For your convenience, we have listed synonyms and CAS numbers to help you find the best supplier. The use of synonyms and CAS numbers can be helpful in identifying potential suppliers, but it is crucial to note that they might not always indicate the exact same product. It is important to confirm the product details with the supplier before making a purchase to ensure that it meets your requirements.
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