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Also known as: 7632-00-0, Nitrous acid, sodium salt, Sodium;nitrite, Nitrite, sodium, Sodium nitrite solution, Natrium nitrit
Molecular Formula
NNaO2
Molecular Weight
68.995  g/mol
InChI Key
LPXPTNMVRIOKMN-UHFFFAOYSA-M
FDA UNII
M0KG633D4F

Sodium Nitrite
Nitrous acid sodium salt. Used in many industrial processes, in meat curing, coloring, and preserving, and as a reagent in ANALYTICAL CHEMISTRY TECHNIQUES. It is used therapeutically as an antidote in cyanide poisoning. The compound is toxic and mutagenic and will react in vivo with secondary or tertiary amines thereby producing highly carcinogenic nitrosamines.
1 2D Structure

Sodium Nitrite

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
sodium;nitrite
2.1.2 InChI
InChI=1S/HNO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1
2.1.3 InChI Key
LPXPTNMVRIOKMN-UHFFFAOYSA-M
2.1.4 Canonical SMILES
N(=O)[O-].[Na+]
2.2 Other Identifiers
2.2.1 UNII
M0KG633D4F
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Nitrite, Sodium

2.3.2 Depositor-Supplied Synonyms

1. 7632-00-0

2. Nitrous Acid, Sodium Salt

3. Sodium;nitrite

4. Nitrite, Sodium

5. Sodium Nitrite Solution

6. Natrium Nitrit

7. Nitrito Sodico

8. Nitrite De Sodium

9. Natrum Nitrosum

10. Nitrous Acid Soda

11. Nano2

12. Sodium Nitrite [usp]

13. Mfcd00011118

14. Chembl93268

15. Ins No.250

16. M0kg633d4f

17. Chebi:78870

18. Ins-250

19. Nsc-77391

20. Sodium Nitrite (usp)

21. Dsstox_cid_941

22. Dsstox_rid_75879

23. Dsstox_gsid_20941

24. Caswell No. 782

25. Dusitan Sodny [czech]

26. Azotyn Sodowy [polish]

27. Azotyn Sodowy

28. Natrium Nitrit [german]

29. Nitrito Sodico [spanish]

30. Nitrite De Sodium [french]

31. Ccris 559

32. Cas-7632-00-0

33. Hsdb 757

34. Sodium Nitrite Solution, 40 Wt. % In H2o

35. Einecs 231-555-9

36. Nsc 77391

37. Un1500

38. Epa Pesticide Chemical Code 076204

39. Unii-m0kg633d4f

40. Natrium Nitrite

41. Sodium Nitrit

42. Natrii Nitris

43. Nitrous Acid, Sodium Salt (1:1)

44. Sodium Nitrite (tn)

45. Sodium Nitrite Acs Grade

46. Ec 231-555-9

47. Sodium Nitrite [mi]

48. Sodium Nitrite [fcc]

49. Sodium Nitrite [hsdb]

50. Sodium Nitrite [inci]

51. Natrum Nitrosum [hpus]

52. Sodium Nitrite [vandf]

53. Sodium Nitrite [mart.]

54. Sodium Nitrite, Ar, >=98%

55. Sodium Nitrite, Lr, >=98%

56. Dtxsid0020941

57. Sodium Nitrite [usp-rs]

58. Sodium Nitrite [who-dd]

59. Sodium Nitrite [who-ip]

60. Hms3652k08

61. Sodium Nitrite, Analytical Standard

62. Sodium Nitrite, Granular, 99.5%

63. Sodium Nitrite, Trace Metals Grade

64. Tox21_202155

65. Tox21_300025

66. S4074

67. Sodium Nitrite [orange Book]

68. Natrii Nitris [who-ip Latin]

69. Sodium Nitrite [ep Monograph]

70. Akos024427981

71. Sodium Nitrite [usp Monograph]

72. Ccg-266007

73. Ncgc00090737-01

74. Ncgc00090737-02

75. Ncgc00254137-01

76. Ncgc00259704-01

77. Sodium Nitrite [un1500] [oxidizer]

78. Bp-31053

79. E250

80. Nithiodote Component Sodium Nitrite

81. Sodium Nitrite, Acs Reagent, >=97.0%

82. Sodium Nitrite, 0.1m Standardized Solution

83. Sodium Nitrite, P.a., Acs Reagent, 99%

84. Ft-0645124

85. S0565

86. Sodium Nitrite Component Of Nithiodote

87. Sodium Nitrite, 99.5%, Super Free-flowing

88. Sodium Nitrite, Reagentplus(r), >=99.0%

89. Sw219150-1

90. Sodium Nitrite, 99.999% Trace Metals Basis

91. Sodium Nitrite, Saj First Grade, >=97.0%

92. D05865

93. E78844

94. Sodium Nitrite, >=99.99% Trace Metals Basis

95. Sodium Nitrite, Jis Special Grade, >=98.5%

96. Sodium Nitrite, Purum P.a., >=98.0% (rt)

97. Q339975

98. Sodium Nitrite, Puriss. P.a., Acs Reagent, >=99.0% (rt)

99. Sodium Nitrite, United States Pharmacopeia (usp) Reference Standard

100. Nitrite Ion Standard Solution, 0.01 M No2-, For Ion-selective Electrodes

101. Nitrite Ion Standard Solution, 0.1 M No2-, For Ion-selective Electrodes

102. Sodium Nitrite, Anhydrous, Free-flowing, Redi-dri(tm), Acs Reagent, >=97%

103. Sodium Nitrite, Puriss. P.a., Acs Reagent, Reag. Ph. Eur., >=99%

104. Sodium Nitrite, Puriss., Meets Analytical Specification Of Ph. Eur., Bp, Usp, Fcc, E 250, 99-100.5% (calc. To The Dried Substance)

2.4 Create Date
2008-02-05
3 Chemical and Physical Properties
Molecular Weight 68.995 g/mol
Molecular Formula NNaO2
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count3
Rotatable Bond Count0
Exact Mass68.98267252 g/mol
Monoisotopic Mass68.98267252 g/mol
Topological Polar Surface Area52.5 Ų
Heavy Atom Count4
Formal Charge0
Complexity13.5
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count2
4 Drug and Medication Information
4.1 Drug Information
1 of 2  
Drug NameSodium nitrite
PubMed HealthSodium Nitrite (Injection)
Drug ClassesCyanide Antidote
Drug LabelSodium nitrite has the chemical name nitrous acid sodium salt. The chemical formula is NaNO2 and the molecular weight is 69.0. The structural formula is:Structure of Sodium NitriteSodium Nitrite Injection is a cyanide antidote which contains one 10 m...
Active IngredientSodium nitrite
Dosage FormSolution
RouteIntravenous
Strength300mg/10ml (30mg/ml)
Market StatusPrescription
CompanyHope Pharms

2 of 2  
Drug NameSodium nitrite
PubMed HealthSodium Nitrite (Injection)
Drug ClassesCyanide Antidote
Drug LabelSodium nitrite has the chemical name nitrous acid sodium salt. The chemical formula is NaNO2 and the molecular weight is 69.0. The structural formula is:Structure of Sodium NitriteSodium Nitrite Injection is a cyanide antidote which contains one 10 m...
Active IngredientSodium nitrite
Dosage FormSolution
RouteIntravenous
Strength300mg/10ml (30mg/ml)
Market StatusPrescription
CompanyHope Pharms

4.2 Therapeutic Uses

Antidotes ...

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


Has been used as a vasodilator; as a circulatory (blood pressure) depressant and to relieve smooth muscle spasm.

Budavari, S. (ed.). The Merck Index - Encyclopedia of Chemicals, Drugs and Biologicals. Rahway, NJ: Merck and Co., Inc., 1989., p. 1365


Antidote for cyanide poisoning.

Budavari, S. (ed.). The Merck Index - Encyclopedia of Chemicals, Drugs and Biologicals. Rahway, NJ: Merck and Co., Inc., 1989., p. 1365


MEDICATION (VET): In cyanide poisoning.

Budavari, S. (ed.). The Merck Index - Encyclopedia of Chemicals, Drugs and Biologicals. Rahway, NJ: Merck and Co., Inc., 1989., p. 1365


For more Therapeutic Uses (Complete) data for SODIUM NITRITE (12 total), please visit the HSDB record page.


4.3 Minimum/Potential Fatal Human Dose

General Toxicity Study: oral human, LDLo 71 mg/kg, coma, gastrointestinal effects, and methemoglobinemia; oral child, LDLo 22 mg/kg, vascular effects.

European Chemicals Bureau; IUCLID Dataset, Sodium nitrite (7632-00-0) (2000 CD-ROM edition). Available from, as of October 27, 2006: https://esis.jrc.ec.europa.eu/


The lethal oral dose of nitrite for adults has been variously reported to be between 0.7 and 6 g NO2- (approximately 10 to 100 mg NO2-/kg). /Nitrite/

IPCS; Poisons Information Monograph G016: Nitrates and nitrites. (September 1996). Available from, as of October 24, 2006: https://www.inchem.org/documents/pims/chemical/pimg016.htm


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Food Preservatives

Substances capable of inhibiting, retarding or arresting the process of fermentation, acidification or other deterioration of foods. (See all compounds classified as Food Preservatives.)


Indicators and Reagents

Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant and Hackh's Chemical Dictionary, 5th ed, p301, p499) (See all compounds classified as Indicators and Reagents.)


5.2 ATC Code

V - Various

V03 - All other therapeutic products

V03A - All other therapeutic products

V03AB - Antidotes

V03AB08 - Sodium nitrite


5.3 Absorption, Distribution and Excretion

In mice given 400, 800, or 1200 mg sodium nitrite orally in drinking water 99.1 to 99.5% of the dose was eliminated. The remaining nitrite was transformed into nitrate & recovered from the liver & muscle.

CANTONI C ET AL; ARCH VET ITAL 32 (1-2): 7 (1981)


Nitrate and nitrite given orally are absorbed and transferred to the blood in the upper part of the gastrointestinal tract. Abundant pectin in the food may delay absorption which may then occur lower down in the intestine, with possible increased risk for microbial transformation of nitrate into nitrite. /Nitrate and nitrite/

IPCS; Poisons Information Monograph G016: Nitrates and nitrites. (September 1996). Available from, as of October 24, 2006: https://www.inchem.org/documents/pims/chemical/pimg016.htm


Regardless of route of exposure, nitrate and nitrite are rapidly transferred into the blood. Nitrite is gradually oxidized to nitrate which is readily distributed into most body fluids (urine, saliva, gastric juice, sweat, ileostomy fluid). Distribution of nitrate into plasma, erythrocytes, saliva and urine following an oral dose of sodium nitrate has been demonstrated ... /Nitrate and nitrite/

IPCS; Poisons Information Monograph G016: Nitrates and nitrites. (September 1996). Available from, as of October 24, 2006: https://www.inchem.org/documents/pims/chemical/pimg016.htm


... Transplacental passage of nitrite occurred in pregnant rats given doses at 2.5-50 mg/kg orally ...

National Research Council. Drinking Water & Health Volume 1. Washington, DC: National Academy Press, 1977., p. 420


For more Absorption, Distribution and Excretion (Complete) data for SODIUM NITRITE (10 total), please visit the HSDB record page.


5.4 Metabolism/Metabolites

... Intestinal bacteria were involved in the reduction of nitrite ... Absorbed nitrite is rapidly oxidized to nitrate in the blood by a mammalian process ... The process of nitrate generation parallels the methemoglobin (MetHb) formation ... Nitrite oxidation to nitrate may also occur in the stomach prior to absorption, as demonstrated in vitro for mice. However, under in vivo conditions, nitrite is probably absorbed from the stomach before large quantities of nitrate are formed. /Nitrite/

WHO; WHO Food Additives Series 35 (844): Nitrite. Available from, as of October 27, 2006: https://www.inchem.org/documents/jecfa/jecmono/v35je13.htm


... Nitrite may be further reduced to nitrogen by bacteria under some conditions. In blood, nitrite transforms hemoglobin to methemoglobin and is simultaneously oxidized to nitrate. Normally methemoglobin gradually reverts to hemoglobin through enzymatic reactions. Nitrite has vasodilating properties, probably through transformation into nitric oxide (NO) or a NO-containing molecule acting as a signal factor for smooth muscle relaxation. Nitrite easily transforms into a nitrosating agent in an acidic environment and can react with a variety of compounds, eg ascorbic acid, amines, amides. Nitrosation can also be mediated by bacteria, eg in the stomach. Some reaction products are carcinogenic (eg most nitrosoamines and amides). /Nitrate and nitrite/

IPCS; Poisons Information Monograph G016: Nitrates and nitrites. (September 1996). Available from, as of October 24, 2006: https://www.inchem.org/documents/pims/chemical/pimg016.htm


No or very slight increase in blood nitrosamine level was found in human subjects after consumption of nitrate-, nitrite-, and/or amine-rich meals /Nitrate, nitrite, and amine/

WHO; WHO Food Additives Series 35 (844): Nitrite. Available from, as of October 27, 2006: https://www.inchem.org/documents/jecfa/jecmono/v35je13.htm


The details of nitrite metabolism became a more complex when it was recognized that conversion of nitrite into nitric oxide can occur under certain physiological conditions such as hypoxia. This represents a reversal of the well-known nitric oxide-to-nitrite/nitrate pathways. As noted earlier, experiments in the 1980s showed that the nitrite ion could react with deoxygenated hemoglobin to release nitric oxide, but these experiments were carried out in vitro and their potential physiological relevance was not apparent. Zweier et al. (1995) reported that, in a perfused heart model for ischaemia, nitrite ion was converted in vivo directly into nitric oxide, which demonstrated that the earlier observations did in fact have biochemical implications. These studies have been followed by several related experiments indicating a renewed interest in the biochemistry of nitrite/nitrate. A model for nitrite/nitrate metabolism has emerged based on extensive and sometimes subtle interactions among ingested and endogenously synthesized nitrate, nitrite, nitric oxide and some related species, and the physiology of the organism.

IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. V. 94: p. 272(2010)


5.5 Mechanism of Action

There is an active endogenous nitrogen cycle in humans that involves nitrate and nitrite, which are interconvertible in vivo. Nitrosating agents that arise from nitrite under acidic gastric conditions react readily with nitrosatable compounds, especially secondary amines and amides, to generate N-nitroso compounds. These nitrosating conditions are enhanced following ingestion of additional nitrate, nitrite or nitrosatable compounds. Some of the N-nitroso compounds that could be formed in humans under these conditions are known carcinogens.

IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. V. 94: p. 323 (2010)


To clarify the mechanisms underlying forestomach carcinogenesis in rats by co-treatment with catechol and sodium nitrite (NaNO2), /the authors/ investigated the involvement of oxidative stress resulting from reaction of the two compounds. Since generation of semiquinone radical, hydroxyl radical (*OH), and peroxynitrite (ONOO-) arose through the reaction of catechol with NO, we proposed that superoxide resulting from catechol oxidation reacted with excess NO, consequently yielding *OH via ONOO-. Male F344 rats were co-treated with 0.2% catechol in the diet and 0.8% NaNO2 in the drinking water for 2 weeks. Prior to occurrence of histological evidence indicating epithelial injury and hyperplasia, 8-hydroxydeoxyguanosine levels in forestomach epithelium significantly increased from 12 hr together with appearance of immunohistochemically nitrotyrosine-positive epithelial cells. There were no remarkable changes in rats given each chemical alone. We conclude that oxidative stress due to NO plays an important role in induction of forestomach epithelial damage, cell proliferation, and thus presumably forestomach carcinogenesis.

PMID:16530157 Ishii Y et al; Arch Biochem Biophys 447 (2): 127-35 (2006)


... The major concern of possible long-term effects of exposure to nitrate and nitrite is associated with formation of nitroso compounds, many of which are carcinogenic. This formation may take place wherever nitrite and nitrosable compounds are present, but it is favored by acidic conditions or the presence of some bacteria. The gastrointestinal tract and especially the stomach is regarded as the main formation site, but nitrosation reactions can also take place in an infected urinary bladder ... /Nitrate and nitrite poisoning/

IPCS; Poisons Information Monograph G016: Nitrates and nitrites. (September 1996). Available from, as of October 24, 2006: https://www.inchem.org/documents/pims/chemical/pimg016.htm


The two basic actions of sodium nitrite in vivo are relaxation of smooth muscle, especially of small blood vessels, and in toxic doses the conversion of hemoglobin to methemoglobin.

Gosselin, R.E., R.P. Smith, H.C. Hodge. Clinical Toxicology of Commercial Products. 5th ed. Baltimore: Williams and Wilkins, 1984., p. III-314


For more Mechanism of Action (Complete) data for SODIUM NITRITE (8 total), please visit the HSDB record page.


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