prenatal and postanatal study on pranoprofen, as an antiinflammatory agent, was conducted by oral administration in Sprague-Dawley pregnancy rats from day 17 of gestation to day 21 of after delivery. Pranoprofen was intubated doses of 1.0, 2.5 and 5.0 mg/kg/day and dose of 5.0mg/kg/day of Indomethacin was used as positive control. After delivery, several study indexes such as length of gestation, No. of implantations, No. of live pups, No. of perinatal deaths, sex ratio and No. of malformation were checked and then all the newborns were feeded and investigated physical and behavioral changes.