Enflicoxib (E 6087) is a nonsteroidal anti-inflammatory compound that selectively inhibits cyclooxygenase-2 (COX-2). Enflicoxib does not inhibit cyclooxygenase-1 (COX-1). E-6087 shows anti-inflammatory, analgesic and antipyretic activities in animal models[1].
E-6132, one of Enflicoxib (E-6087) metabolites, also inhibits COX-2. After single oral administration of 5 mg/kg of E-6087 to rats, plasma concentrations of Enflicoxib at peak time are higher than those of E-6132, suggesting that activity is mainly due to Enflicoxib[1].Enflicoxib (E-6087) is characterized by a long elimination half-life (20-35 h), a low plasma clearance (0.10-0.22 L/h/kg) and a relatively large volume of distribution (2-6 L/kg) in rats and dogs after single oral and intravenous doses. Enflicoxib and E-6132 (a pharmacologically active metabolite) show different pharmacokinetics. The higher percentage of Enflicoxib at early times suggests that Enflicoxib is the main compound responsible for in vivo activity, although E-6132 would contribute to the activity at later times[2].
[1]. Carlos PÉrez-Maseda, et al. Determination of enantiomeric purity of a novel COX-2 anti-inflammatory drug by capillary electrophoresis using single and dual cyclodextrin systems. Electrophoresis. 2003 May;24(9):1416-21.
[2]. R F Reinoso, et al. Pharmacokinetics of E-6087, a new anti-inflammatory agent, in rats and dogs. Biopharm Drug Dispos. 2001 Sep;22(6):231-42.