Clinical data
AHFS/Drugs.com International Drug Names
ATC code M02AA16 (WHO)
PubChem (CID) 35455
ChemSpider 32612 YesY
KEGG D01305 YesY
ECHA InfoCard 100.045.735
Chemical and physical data
Formula C20H20N2O2
Molar mass 320.385 g/mol
3D model (Jmol) Interactive image

Feprazone (or prenazone) is a drug used for joint and muscular pain.[1]

It is an analog of butazone but instead of a n-butyl group it is prenylated.


  1. Koyama, T.; Izawa, Y.; Wada, H.; Makita, T.; Hashimoto, Y.; Enomoto, M. (1982). "Toxicological aspects of feprazone, a new nonsteroidal anti-inflammatory drug". Toxicology and applied pharmacology. 64 (2): 255–270. doi:10.1016/0041-008X(82)90222-8. PMID 7123554.

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