5-hydroxyIndomethacin is a metabolite of indomethacin .1It is formed from indomethacin in rabbit hepatic microsomes. 1.Evans, M.A., Papazafiratou, C., Bhat, R., et al.Indomethacin metabolism in isolated neonatal and fetal rabbit hepatocytesPediatr. Res.15(11)1406-1410(1981)