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Aspirin (USAN), also known as acetylsalicylic acid (pronounced /əˌsɛtəlˌsælɨˈsɪlɨk/ ə-SET-əl-sal-i-SIL-ik, abbreviated ASA), is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication.

Systematic (IUPAC) name
2-acetoxybenzoic acid
Identifiers
CAS number	50-78-2
ATC code	A01AD05 B01AC06, N02BA01
PubChem	CID 2244
DrugBank	DB00945
ChemSpider	2157 Y
UNII	R16CO5Y76E Y
KEGG	D00109 Y
ChEBI	CHEBI:116450
ChEMBL	CHEMBL25 Y
Chemical data
Formula	C9H8O4
Mol. mass	180.157 g/mol
SMILES	eMolecules & PubChem
InChI[show] InChI=1S/C9H8O4/c1-6(10)13-8-5-3-2-4-7(8)9(11)12/h2-5H,1H3,(H,11,12) Y Key: BSYNRYMUTXBXSQ-UHFFFAOYSA-N Y
Synonyms	2-acetyloxybenzoic acid acetylsalicylate acetylsalicylic acid O-acetylsalicylic acid
Physical data
Density	1.40 g/cm³
Melt. point	135 °C (275 °F)
Boiling point	140 °C (284 °F) (decomposes)
Solubility in water	3 mg/mL (20 °C)
Pharmacokinetic data
Bioavailability	Rapidly and completely absorbed
Protein binding	99.60%
Metabolism	Hepatic
Half-life	300–650 mg dose: 3.1–3.2 h 1 g dose: 5 h 2 g dose: 9 h
Excretion	Renal