NAPROXEN
(+)-(S)-6-Methoxy-a-Methyl-2-Naphthaleneacetic Acid
NAPROXEN is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.
Regulatory evidence by market
No rule for this ingredient has been imported for any of the 13 markets tracked here.
That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.
Chemical identity and properties
Naproxen
Naproxen is a methoxynaphthalene that is 2-methoxynaphthalene substituted by a carboxy ethyl group at position 6. Naproxen is a non-steroidal anti-inflammatory drug commonly used for the reduction of pain, fever, inflammation and stiffness caused by conditions such as osteoarthritis, kidney stones, rheumatoid arthritis, psoriatic arthritis, gout, ankylosing spondylitis, menstrual cramps, tendinitis, bursitis, and for the treatment of primary dysmenorrhea. It works by inhibiting both the COX-1 and COX-2 enzymes. It has a role as a non-steroidal anti-inflammatory drug, a non-narcotic analgesic, an antipyretic, a xenobiotic, a gout suppressant, a cyclooxygenase 2 inhibitor, a cyclooxygenase 1 inhibitor, an environmental contaminant and a drug allergen. It is a monocarboxylic acid and a methoxynaphthalene. It is a conjugate acid of a naproxen(1-). — ChEBI
- IUPAC name
- (2S)-2-(6-methoxynaphthalen-2-yl)propanoic acid
- Molecular formula
- C14H14O3
- Molecular weight
- 230.26 g/mol
- Exact mass
- 230.094294304 Da
- XLogP3
- 3.3
- Topological polar surface area
- 46.5 Ų
- Hydrogen-bond donors
- 1
- Hydrogen-bond acceptors
- 3
- Covalent units
- 1
- Defined stereocentres
- 1
Also known as
16 more reported names
External database identifiers
Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Inventory details for NAPROXEN
INCI name
NAPROXEN
INN name
Naproxen [USAN:INN:BAN:JAN]
Description
(+)-(S)-6-Methoxy-a-Methyl-2-Naphthaleneacetic Acid
Record provenance
- Inventory reference
- 82882
- Imported identity
- NAPROXEN
- Source update
- 15/10/2010
Annex records for NAPROXEN
Key data
Official EU ingredient-name evidence
The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.
Related inventory evidence
Ingredients with overlapping formulation functions
Additional official and scientific sources
11 external databases to check this identity in
Each link searches that source for this identity. What each source is, and its legal weight
How NAPROXEN appears in the CosIng inventory
The CosIng inventory lists NAPROXEN as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.
NAPROXEN is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.
Frequently asked questions
Source note for NAPROXEN
This page reproduces the CosIng inventory entry for NAPROXEN from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.
Use this inventory page to research NAPROXEN and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.
Tools & next steps
Check your formula
Scan a full INCI list to detect NAPROXEN and any linked EU annex restrictions or allergen flags.
INCI CheckerSearch similar ingredients
Find other inventory ingredients and annex entries related to NAPROXEN, its identifiers or nearby name variants.
Search