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Chemistry

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Also known as: 54-96-6, Pyridine-3,4-diamine, Amifampridine, 3,4-pyridinediamine, 3,4-dap, 4,5-diaminopyridine
Molecular Formula
C5H7N3
Molecular Weight
109.13  g/mol
InChI Key
OYTKINVCDFNREN-UHFFFAOYSA-N
FDA UNII
RU4S6E2G0J

Amifampridine
4-Aminopyridine derivative that acts as a POTASSIUM CHANNEL blocker to increase release of ACETYLCHOLINE from nerve terminals. It is used in the treatment of CONGENITAL MYASTHENIC SYNDROMES.
Amifampridine is a Potassium Channel Blocker. The mechanism of action of amifampridine is as a Potassium Channel Antagonist.
1 2D Structure

Amifampridine

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
pyridine-3,4-diamine
2.1.2 InChI
InChI=1S/C5H7N3/c6-4-1-2-8-3-5(4)7/h1-3H,7H2,(H2,6,8)
2.1.3 InChI Key
OYTKINVCDFNREN-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CN=CC(=C1N)N
2.2 Other Identifiers
2.2.1 UNII
RU4S6E2G0J
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 3,4 Diaminopyridine

2. Amifampridine

3. Amifampridine Phosphate

4. Firdapse

5. Ruzurgi

2.3.2 Depositor-Supplied Synonyms

1. 54-96-6

2. Pyridine-3,4-diamine

3. Amifampridine

4. 3,4-pyridinediamine

5. 3,4-dap

6. 4,5-diaminopyridine

7. Diamino-3,4 Pyridine

8. Amifampridin

9. Ruzurgi

10. Pyridine, 3,4-diamino-

11. 3,4 Diaminopyridine

12. Dynamine

13. 3-amino-4-pyridinylamine

14. Nsc-521760

15. Ru4s6e2g0j

16. 54-96-6 (free Base)

17. Chembl354077

18. Ncgc00167560-01

19. Dsstox_cid_26715

20. Dsstox_rid_81847

21. Dsstox_gsid_46715

22. Cas-54-96-6

23. Smr000752913

24. Amifampridine [inn]

25. Einecs 200-220-9

26. Unii-ru4s6e2g0j

27. Nsc 521760

28. Brn 0110232

29. Amifampridine [usan:inn:ban]

30. Ruzurgi (tn)

31. Mfcd00006401

32. Pyridine,4-diamino-

33. 3,4-diamino Pyridine

34. 3,4-diamino-pyridine

35. 3,4-diammoniopyridinium

36. Amifampridine [mi]

37. Wln: T6nj Cz Dz

38. Amifampridine (usan/inn)

39. 4-dap

40. Amifampridine [usan]

41. Schembl21273

42. 5-22-11-00266 (beilstein Handbook Reference)

43. Mls001304911

44. Mls001333181

45. Mls001333182

46. Amifampridine [mart.]

47. Amifampridine [who-dd]

48. Gtpl8032

49. 3,4-diamino[3,4-b]pyridine

50. Amifampridine [ema Epar]

51. Dtxsid6046715

52. Ampd00217

53. Chebi:135948

54. Hms2233k06

55. Zinc164000

56. Amifampridine [orange Book]

57. Act01546

58. Albb-005969

59. Bcp22343

60. Amifampridin (3,4-diaminopyridine)

61. Tox21_112555

62. 3,4 Diaminopyridine [vandf]

63. Bbl013269

64. Bdbm50416493

65. Cl0116

66. Nsc521760

67. Nsc790505

68. S4622

69. Stk503647

70. Akos000672436

71. Tox21_112555_1

72. Ccg-304141

73. Db11640

74. Nsc-790505

75. Pb48915

76. Ps-9273

77. Ncgc00167560-02

78. Bp-12781

79. Hy-14946

80. Db-011105

81. Am20070030

82. D1149

83. Ft-0614203

84. D10228

85. 006d401

86. Ac-907/34116043

87. Q411707

88. J-610017

89. W-105592

90. F0001-1409

91. L89

2.4 Create Date
2005-03-26
3 Chemical and Physical Properties
Molecular Weight 109.13 g/mol
Molecular Formula C5H7N3
XLogP3-0.5
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count3
Rotatable Bond Count0
Exact Mass109.063997236 g/mol
Monoisotopic Mass109.063997236 g/mol
Topological Polar Surface Area64.9 Ų
Heavy Atom Count8
Formal Charge0
Complexity74.1
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Drug Indication

Amifampridine is indicated for the symptomatic treatment of Lambert-Eaton myasthenic syndrome (LEMS) in adults and in patients aged 6 to less than 17 years of age. Nevertheless, it is important to note that at the current time only the Firdapse brand of amifampridine is indicated for the treatment of LEMS in adults and the Ruzurgi brand of amifampridine is indicated for the treatment of LEMS in patients aged 6 to less than 17 years.


FDA Label


Symptomatic treatment of Lambert-Eaton myasthenic syndrome (LEMS) in adults.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Administration of amifampridine to patients with LES in clinical trials resulted in improvement of the compound muscle action potential (CMAP), muscle function, and quantitative myasthenia gravis (QMG) score. One case of a slight prolongation of the QTc interval in male patient with LEMS and euthyroid Hashimotos disease treated with 90 mg of amifampridine in combination with 100 mg azathioprine was reported. I_n vitro_, amifampridine was shown to modulate cardiac conduction and induce phasic contractions in different arteries from several species. In addition, it stimulated potassium-evoked dopamine and noradrenaline release in rat hippocampal slices and upregulate acetylcholine release in the brain. It may also potentiate adrenergic and cholinergic neuromuscular transmission in the gatrointestinal tract. In a single pharmacokinetic study, no effect was observed of amifampridine phosphate on cardiac repolarization as assessed using the QTc interval. There were no changes in heart rate, atrioventricular conduction or cardiac depolarization as measured by the heart rate, PR and QRS interval durations.


5.2 MeSH Pharmacological Classification

Neuromuscular Agents

Drugs used for their actions on skeletal muscle. Included are agents that act directly on skeletal muscle, those that alter neuromuscular transmission (NEUROMUSCULAR BLOCKING AGENTS), and drugs that act centrally as skeletal muscle relaxants (MUSCLE RELAXANTS, CENTRAL). Drugs used in the treatment of movement disorders are ANTI-DYSKINESIA AGENTS. (See all compounds classified as Neuromuscular Agents.)


Potassium Channel Blockers

A class of drugs that act by inhibition of potassium efflux through cell membranes. Blockade of potassium channels prolongs the duration of ACTION POTENTIALS. They are used as ANTI-ARRHYTHMIA AGENTS and VASODILATOR AGENTS. (See all compounds classified as Potassium Channel Blockers.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
AMIFAMPRIDINE
5.3.2 FDA UNII
RU4S6E2G0J
5.3.3 Pharmacological Classes
Mechanisms of Action [MoA] - Potassium Channel Antagonists
5.4 ATC Code

N07XX05


N - Nervous system

N07 - Other nervous system drugs

N07X - Other nervous system drugs

N07XX - Other nervous system drugs

N07XX05 - Amifampridine


5.5 Absorption, Distribution and Excretion

Absorption

Orally-administered amifampridine is rapidly absorbed in humans to reach the peak plasma concentrations within by 0.6 to 1.3 hours. A single oral dose of 20 mg amifampridine in fasted individuals resulted in mean peak plasma concentrations (Cmax) ranging from 16 to 137 ng/mL. Bioavailability is approximately 93-100% based on recoveries of unmetabolised amifampridine and a major 3-N-acetylated amifampridine metabolite in urine. Food consumption decreases amifampridine absorption and exposure with a decrease in the time to reach maximum concentrations (Tmax). It is approximated that food consumption lowers the Cmax on average by ~44% and lowers AUC by ~20%. based on geometric mean ratios. Systemic exposure to amifampridine is affected by the overall metabolic acetylation activity of NAT enzymes and NAT2 genotype. The NAT enzymes are highly polymorphic that results in variable slow acetylator (SA) and rapid acetylator (RA) phenotypes. Slow acetylators are more prone to increased systemic exposure to amifampridine, and may require higher doses for therapeutic efficacy.


Route of Elimination

Following oral administration, more than 93% of total amifampridine is renally eliminated within 24 hours. About 19% of the total renally-excreted dose is in the parent drug form, and about 74-81.7% of the dose is in its metabolite form.


Volume of Distribution

In rats, orally-administered amifampridine was extensively absorbed in the gastrointestinal tract and widely distributed. Drug concentrations were highest in organs of excretion, including liver, kidney and the gastrointestinal tract, and some tissues of glandular function, such as lacrimal, salivary, mucous, pituitary and thyroid glands. Concentrations in tissues are generally similar to or greater than concentrations in plasma.


Clearance

Overall clearance of amifampridine is both metabolic and renal; it is mostly cleared from the plasma via metabolism by N-acetylation.


5.6 Metabolism/Metabolites

3-N-acetylated amifampridine is the major metabolite based on _in vivo_ and _in vitro_ human studies.


5.7 Biological Half-Life

The plasma elimination half-life is approximately 2.5 hours for amifampridine and 4 hours for 3-N-acetylamifampridine.


5.8 Mechanism of Action

Amifampridine is a symptomatic treatment that increases acetylcholine concentrations at the neuromuscular junction. It selectively blocks presynaptic fast voltage-gated potassium channels, thereby prolonging cell membrane depolarization and action potential, and augmenting calcium transport into the nerve endings. Increased intracellular calcium enhances the exocytosis of acetylcholine-containing vesicles and enhances impulse transmission at central, autonomic, and neuromuscular synapses. Amifampridine improves muscle strength and resting compound muscle action potential (CMAP) amplitudes with an overall weighted mean difference of 1.69 mV.


API Reference Price

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11-Aug-2022
12-Feb-2024
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ABOUT THIS PAGE

Amifampridine Manufacturers

A Amifampridine manufacturer is defined as any person or entity involved in the manufacture, preparation, processing, compounding or propagation of Amifampridine, including repackagers and relabelers. The FDA regulates Amifampridine manufacturers to ensure that their products comply with relevant laws and regulations and are safe and effective to use. Amifampridine 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 Amifampridine manufacturers with USDMF, JDMF, KDMF, CEP, GMP, COA and API Price related information on PhamaCompass.

Amifampridine Suppliers

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

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

Amifampridine USDMF

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

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

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

Amifampridine 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 Amifampridine as an active pharmaceutical ingredient (API).

Finished drug products

The FDA updates the NDC directory daily. The NDC numbers for Amifampridine 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 Amifampridine 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 Amifampridine and are produced by outsourcing facilities. While these outsourcing facilities are not mandated to assign a Amifampridine NDC to their finished compounded human drug products, they may choose to do so.

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

Amifampridine GMP

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

Amifampridine CoA

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

Amifampridine CoA mostly includes findings from lab analyses of a specific batch. For each Amifampridine 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.

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