Skip Navigation
ChemIDplus Lite•Browse•Advanced

Substance Name: Aspirin [USP:BAN:JAN]
RN: 50-78-2
UNII: R16CO5Y76E
InChIKey: BSYNRYMUTXBXSQ-UHFFFAOYSA-N

Note

  • The prototypical analgesic used in the treatment of mild to moderate pain. It has anti-inflammatory and antipyretic properties and acts as an inhibitor of cyclooxygenase which results in the inhibition of the biosynthesis of prostaglandins. Aspirin also inhibits platelet aggregation and is used in the prevention of arterial and venous thrombosis. (From Martindale, The Extra Pharmacopoeia, 30th ed, p5).

Molecular Formula

  • C9-H8-O4

Molecular Weight

  • 180.1582
 

Classification Codes

Classification Codes

  • Analgesic
  • Analgesics
  • Analgesics, Non-Narcotic
  • Anti-Inflammatory Agents
  • Anti-Inflammatory Agents, Non-Steroidal
  • Antipyretic
  • Antipyretics
  • Antirheumatic
  • Antirheumatic Agents
  • Antiviral (COVID-19)
  • Cardiovascular Agents
  • Cyclooxygenase Inhibitors
  • Drug / Therapeutic Agent
  • Enzyme Inhibitors
  • Fibrin Modulating Agents
  • Fibrinolytic Agents
  • Hematologic Agents
  • Human Data
  • Mutation Data
  • Peripheral Nervous System Agents
  • Platelet Aggregation Inhibitors
  • Reproductive Effect
  • Sensory System Agents

Superlist Classification Code

  • TWA 5 mg/m3

Names and Synonyms

Name of Substance

  • Acetylsalicylic acid
  • Aspirin
  • Aspirin [USP:BAN:JAN]

MeSH Heading

  • Aspirin

Synonyms

  • 2-(Acetyloxy)benzoic acid
  • 2-Acetoxybenzoic acid
  • 2-Carboxyphenyl acetate
  • 4-10-00-00138 (Beilstein Handbook Reference)
  • 8-hour Bayer
  • A.S.A.
  • A.S.A. empirin
  • AC 5230
  • Acenterine
  • Acesal
  • Aceticyl
  • Acetilsalicilico
  • Acetilum acidulatum
  • Acetisal
  • Acetol
  • Acetol (VAN)
  • Acetonyl
  • Acetophen
  • Acetosal
  • Acetosalic acid
  • Acetosalin
  • Acetylin
  • Acetylsal
  • Acetylsalicylate
  • Acetylsalicylsaure
  • Acetylsalicylsaure [German]
  • Acetylsalycilic acid
  • Acide acetylsalicylique
  • Acide acetylsalicylique [French]
  • Acido acetilsalicilico
  • Acido acetilsalicilico [Italian]
  • Acido O-acetil-benzoico
  • Acido O-acetil-benzoico [Italian]
  • Acidum acetylsalicylicum
  • Acimetten
  • Acisal
  • Acylpyrin
  • Adiro
  • AI3-02956
  • ASA
  • Asagran
  • Asaphen
  • Aspec
  • Aspergum
  • Aspir-Mox
  • Aspirdrops
  • Aspirin
  • Aspirina 03
  • Aspirine
  • Aspro
  • Aspro Clear
  • Asteric
  • Bay E4465
  • Bayer
  • Bayer Aspirin 8 Hour
  • Bayer Buffered
  • Bayer Children's Aspirin
  • Bayer Enteric 325 mg Regular Strength
  • Bayer Enteric 500 mg Arthritis Strength
  • Bayer Enteric 81 mg Adult Low Strength
  • Bayer Extra Strength Aspirin for Migraine Pain
  • Bayer Plus
  • Benaspir
  • Benzoic acid, 2-(acetyloxy)-
  • Bi-prin
  • Bialpirina
  • Bialpirinia
  • BRN 0779271
  • Bufferin
  • Caprin
  • CCRIS 3243
  • Cemirit
  • Claradin
  • Clariprin
  • Colfarit
  • Contrheuma retard
  • Coricidin
  • Coricidin D
  • Decaten
  • Delgesic
  • Dolean pH 8
  • Duramax
  • Durlaza
  • Durlaza ER
  • Easprin
  • EC 200-064-1
  • ECM
  • Ecolen
  • Ecotrin
  • EINECS 200-064-1
  • Empirin
  • Endydol
  • Entericin
  • Enterophen
  • Enterosarein
  • Enterosarine
  • Entrophen
  • Extren
  • Globentyl
  • Globoid
  • Helicon
  • HSDB 652
  • Idragin
  • Istopirin
  • Kapsazal
  • Kyselina 2-acetoxybenzoova
  • Kyselina 2-acetoxybenzoova [Czech]
  • Kyselina acetylsalicylova
  • Kyselina acetylsalicylova [Czech]
  • Levius
  • Measurin
  • Medisyl
  • Micristin
  • Neuronika
  • Novid
  • NSC 27223
  • o-Acetoxybenzoic acid
  • O-Acetylsalicylic acid
  • o-Carboxyphenyl acetate
  • Pharmacin
  • Pirseal
  • Polopiryna
  • Premaspin
  • Rheumin tabletten
  • Rheumintabletten
  • Rhodine
  • Rhonal
  • Ronal
  • S-211
  • Salacetin
  • Salcetogen
  • Saletin
  • Salicylic acid acetate
  • Solfrin
  • Solprin acid
  • Solpyron
  • SP 189
  • Spira-Dine
  • St. Joseph Aspirin for Adults
  • Temperal
  • Triple-sal
  • UNII-R16CO5Y76E
  • Xaxa
  • Yasta
  • ZORprin

Systematic Names

  • Aspirin
  • Benzoic acid, 2-(acetyloxy)-
  • O-Acetylsalicylic acid
  • Salicylic acid, acetate

Superlist Names

  • Acetylsalicylic acid
  • Aspirin
  • Benzoic acid, 2-(acetyloxy)-
  • Empirin

Mixture Names

  • A.S.A. and Codeine Compound
  • Anacin
  • Anacin Maximum Strength
  • Arthritis Pain Formula Maximum Strength
  • Ascriptin
  • Axotal
  • Dasin
  • Empirin with Codeine
  • Equagesic
  • Fiorinal
  • Micrainin
  • Norgesic
  • P-A-C Analgesic Tablets
  • Percodan
  • Percodan Demi
  • Persistin
  • Phensal
  • Pravigard PAC
  • Propoxyphene Compound 65
  • Robaxisal
  • Sine-Off Sinus Medicine Tablets-Aspirin Formula
  • SK-65 Compound
  • Soma Compound
  • Supac
  • Synalgos
  • Synalgos-DC
  • Vanquish

Registry Numbers

CAS Registry Number

  • 50-78-2

FDA UNII

  • R16CO5Y76E

Other Registry Numbers

  • 11126-35-5
  • 11126-37-7
  • 2087491-38-9
  • 2349-94-2
  • 26914-13-6
  • 98201-60-6

System Generated Number

  • 0000050782

Structure Descriptors

InChI

InChI=1S/C9H8O4/c1-6(10)13-8-5-3-2-4-7(8)9(11)12/h2-5H,1H3,(H,11,12)

InChIKey

BSYNRYMUTXBXSQ-UHFFFAOYSA-N

Smiles

CC(=O)Oc1ccccc1C(=O)O

Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
child LDLo oral 104mg/kg (104mg/kg) LUNGS, THORAX, OR RESPIRATION: ACUTE PULMONARY EDEMA

BLOOD: HEMORRHAGE

GASTROINTESTINAL: NAUSEA OR VOMITING		 Lancet. Vol. 2, Pg. 809, 1952.
child TDLo oral 10mg/kg/1D-I (10mg/kg) LUNGS, THORAX, OR RESPIRATION: ACUTE PULMONARY EDEMA

KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"

KIDNEY, URETER, AND BLADDER: URINE VOLUME DECREASED		 Clinical Toxicology. Vol. 18, Pg. 247, 1981.
child TDLo oral 39mg/kg/13D-I (39mg/kg) LIVER: "HEPATITIS (HEPATOCELLULAR NECROSIS), DIFFUSE" American Journal of Diseases of Children. Vol. 139, Pg. 453, 1985.
dog LD50 intravenous 681mg/kg (681mg/kg) BEHAVIORAL: ANALGESIA Archives Internationales de Pharmacodynamie et de Therapie. Vol. 149, Pg. 571, 1964.
dog LD50 oral 700mg/kg (700mg/kg) BEHAVIORAL: ALTERED SLEEP TIME (INCLUDING CHANGE IN RIGHTING REFLEX)

LUNGS, THORAX, OR RESPIRATION: RESPIRATORY DEPRESSION		 Arzneimittel-Forschung. Drug Research. Vol. 21, Pg. 719, 1971.
guinea pig LD50 oral 1075mg/kg (1075mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: TREMOR

BEHAVIORAL: ALTERED SLEEP TIME (INCLUDING CHANGE IN RIGHTING REFLEX)		 Journal of the American Pharmaceutical Association, Scientific Edition. Vol. 47, Pg. 479, 1958.
hamster LD50 oral 3500mg/kg (3500mg/kg)   Archives of Toxicology, Supplement. Vol. 7, Pg. 365, 1984.
human TDLo oral 480mg/kg/7D-I (480mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

GASTROINTESTINAL: OTHER CHANGES

SENSE ORGANS AND SPECIAL SENSES: TINNITUS: EAR		 Arzneimittel-Forschung. Drug Research. Vol. 25, Pg. 281, 1975.
human TDLo oral 669mg/kg/11D (669mg/kg) LIVER: LIVER FUNCTION TESTS IMPAIRED American Journal of Hospital Pharmacy. Vol. 35, Pg. 330, 1978.
human TDLo oral 1050mg/kg/14D (1050mg/kg) VASCULAR: OTHER CHANGES Clinical Pharmacology and Therapeutics Vol. 67, Pg. 530, 2000.
human TDLo oral 2880mg/kg/8W (2880mg/kg) SENSE ORGANS AND SPECIAL SENSES: TINNITUS: EAR

GASTROINTESTINAL: NAUSEA OR VOMITING

GASTROINTESTINAL: DECREASED MOTILITY OR CONSTIPATION		 Arzneimittel-Forschung. Drug Research. Vol. 33, Pg. 631, 1983.
infant TDLo oral 120mg/kg (120mg/kg) KIDNEY, URETER, AND BLADDER: HEMATURIA

LUNGS, THORAX, OR RESPIRATION: RESPIRATORY STIMULATION		 British Medical Journal. Vol. 1, Pg. 1081, 1979.
mammal (species unspecified) LD50 oral 1750mg/kg (1750mg/kg)   Indian Journal of Medical Research. Vol. 81, Pg. 621, 1985.
man LDLo unreported 294mg/kg (294mg/kg)   "Poisoning; Toxicology, Symptoms, Treatments," 2nd ed., Arena, J.M., Springfield, IL, C.C. Thomas, 1970Vol. 2, Pg. 73, 1970.
man TDLo oral 857mg/kg (857mg/kg) LUNGS, THORAX, OR RESPIRATION: RESPIRATORY STIMULATION

BEHAVIORAL: COMA		 Human Toxicology. Vol. 7, Pg. 161, 1988.
man TDLo oral 1625mg/kg (1625mg/kg) BEHAVIORAL: COMA Clinical Pediatrics Vol. 24, Pg. 678, 1985.
man TDLo oral 13036mg/kg/5Y (13036mg/kg) SKIN AND APPENDAGES (SKIN): "DERMATITIS, OTHER: AFTER SYSTEMIC EXPOSURE"

GASTROINTESTINAL: OTHER CHANGES

MUSCULOSKELETAL: JOINTS		 Annals of Internal Medicine. Vol. 126, Pg. 665, 1997.
mouse LD50 intraperitoneal 167mg/kg (167mg/kg)   United States Patent Document. Vol. #4376771,
mouse LD50 oral 250mg/kg (250mg/kg)   Arzneimittel-Forschung. Drug Research. Vol. 5, Pg. 572, 1955.
mouse LD50 subcutaneous 1020mg/kg (1020mg/kg)   Chemical and Pharmaceutical Bulletin. Vol. 28, Pg. 1237, 1980.
mouse LD50 unreported 1350mg/kg (1350mg/kg)   United States Patent Document. Vol. #5240918,
rabbit LD50 oral 1010mg/kg (1010mg/kg) BEHAVIORAL: CHANGES IN MOTOR ACTIVITY (SPECIFIC ASSAY) Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 24(3), Pg. 43, 1980.
rat LD50 intraperitoneal 340mg/kg (340mg/kg)   Nippon Yakurigaku Zasshi. Japanese Journal of Pharmacology. Vol. 62, Pg. 11, 1966.
rat LD50 oral 200mg/kg (200mg/kg)   "Toxicology of Drugs and Chemicals," Deichmann, W.B., New York, Academic Press, Inc., 1969Vol. -, Pg. 67, 1969.
rat LD50 rectal 790mg/kg (790mg/kg)   "Toxicology of Drugs and Chemicals," Deichmann, W.B., New York, Academic Press, Inc., 1969Vol. -, Pg. 67, 1969.
women TDLo oral 480mg/kg/5D-I (480mg/kg) KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)" New England Journal of Medicine. Vol. 296, Pg. 418, 1977.
women TDLo oral 525mg/kg/5D-I (525mg/kg) LIVER: "HEPATITIS (HEPATOCELLULAR NECROSIS), DIFFUSE" Annals of Internal Medicine. Vol. 80, Pg. 74, 1974.
women TDLo oral 800mg/kg (800mg/kg) MUSCULOSKELETAL: OTHER CHANGES

KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"		 American Journal of Emergency Medicine. Vol. 7, Pg. 409, 1989.
women TDLo rectal 4550mg/kg (4550mg/kg) CARDIAC: ARRHYTHMIAS (INCLUDING CHANGES IN CONDUCTION)

BRAIN AND COVERINGS: ENCEPHALITIS

BEHAVIORAL: COMA		 Annals of Pharmacotherpy. Vol. 28, Pg. 467, 1994.

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point 135 deg C   EXP
pKa Dissociation Constant 3.49 (none) 25 EXP
log P (octanol-water) 1.19 (none)   EXP
Water Solubility 4600 mg/L 25 EXP
Vapor Pressure 2.52E-05 mm Hg 25 EXP
Henry's Law Constant 1.30E-09 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 8.10E-13 cm3/molecule-sec 25 EST

Physical property data is provided to ChemIDplus by SRC, Inc.