Naproxen

Naproxen, sold under the brand name Aleve among others, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, menstrual cramps, inflammatory diseases such as rheumatoid arthritis, gout and fever. It is taken orally. It is available in immediate and delayed release formulations. Onset of effects is within an hour and lasts for up to twelve hours.

"Antalgin" redirects here. Not to be confused with Analgin.

Naproxen
Clinical data
Pronunciation/nəˈprɒksən/
Trade namesAleve, Naprosyn, others
AHFS/Drugs.comMonograph
MedlinePlusa681029
License data
Pregnancy
category
  • AU: C
Routes of
administration		By mouth
ATC code
Legal status
Legal status
  • AU: S2 (Pharmacy medicine) when in preparations that contain no more than 15 days' supply. Otherwise it is Schedule 4 (Prescription only).
  • CA: OTC
  • UK: POM (Prescription only) / P
  • US: WARNINGOTC / Rx-only
Pharmacokinetic data
Bioavailability95% (by mouth)
Protein binding99%
MetabolismLiver (to 6-desmethylnaproxen)
Elimination half-life12–17 hours (adults)
ExcretionKidney
Identifiers
  • (+)-(S)-2-(6-Methoxynaphthalen-2-yl)propanoic acid
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
PDB ligand
CompTox Dashboard (EPA)
ECHA InfoCard100.040.747
Chemical and physical data
FormulaC14H14O3
Molar mass230.263 g·mol−1
3D model (JSmol)
Melting point152–154 °C (306–309 °F)
  • COc1cc2ccc(cc2cc1)[C@H](C)C(=O)O
  • InChI=1S/C14H14O3/c1-9(14(15)16)10-3-4-12-8-13(17-2)6-5-11(12)7-10/h3-9H,1-2H3,(H,15,16)/t9-/m0/s1 Y
  • Key:CMWTZPSULFXXJA-VIFPVBQESA-N Y
  (verify)

Common side effects include dizziness, headache, bruising, allergic reactions, heartburn, and stomach pain. Severe side effects include an increased risk of heart disease, stroke, gastrointestinal bleeding, and stomach ulcers. The heart disease risk may be lower than with other NSAIDs. It is not recommended in people with kidney problems. Use is not recommended in the third trimester of pregnancy.

Naproxen is a nonselective COX inhibitor. As an NSAID, naproxen appears to exert its anti-inflammatory action by reducing the production of inflammatory mediators called prostaglandins. It is metabolized by the liver to inactive metabolites.

Naproxen was patented in 1967, and approved for medical use in the United States in 1976. In the United States it is available over the counter and as a generic medication. In 2021, it was the 93rd most commonly prescribed medication in the United States, with more than 7 million prescriptions.

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