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Systematic (IUPAC) name
2-{4-[(2-oxocyclopentyl)methyl]phenyl}propanoic acid
CAS number 68767-14-6
ATC code M01AE
PubChem 3965
Chemical data
Formula C15H18O3 
Mol. mass 246.302 g/mol
304.314 g/mol (sodium salt)
Pharmacokinetic data
Bioavailability  ?
Protein binding 97%
Metabolism Hepatic glucuronidation
Half life 75 minutes
Excretion Renal
Therapeutic considerations
Pregnancy cat.


Legal status

Red Stripe (Brazil)

Routes Oral, transdermal

Loxoprofen (INN) is a non-steroidal anti-inflammatory drug in the propionic acid derivatives group, which also includes ibuprofen and naproxen among others. It is marketed in Brazil, Mexico and Japan by Sankyo as its sodium salt, loxoprofen sodium, under the trade name Loxonin, and in Argentina as Oxeno. It is available in these countries for oral administration, and a transdermal preparation was approved for sale in Japan on January 2006.[1]



Loxoprofen is a prodrug. It is quickly converted to its active trans-alcohol metabolite following oral administration, and reaches its peak plasma concentration within 30 to 50 minutes.

Mechanism of action

As most NSAIDs, loxoprofen is a non-selective cyclooxygenase inhibitor, and works by reducing the synthesis of prostaglandins from arachidonic acid.


Loxoprofen should not be administered concomitantly with second-generation quinolone antibiotics such as ciprofloxacin and norfloxacin, as it increases their inhibition of GABA and this may cause seizures.[2] It may also increase the plasma concentration of warfarin, methotrexate, sulfonylurea derivatives and lithium salts, so care should be taken when loxoprofen is administered to patients taking any of these drugs.[2]


  1. ^ Doctor's Guide Global Edition (January 24, 2006). "Percutaneous Absorption-Type Analgesic and Anti-inflammatory Drug Loxonin Poultice 100mg Receives Approval for Manufacture". Press release. Retrieved on 2007-04-19.
  2. ^ a b (Portuguese) LOXONIN - Bula do Medicamento [Label Information]. Centralx (2007). Retrieved on 2007-04-19.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Loxoprofen". A list of authors is available in Wikipedia.
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