[Reproductive and developmental toxicity study of mofezolac (N-22) (3)--Teratogenicity study in rabbits by oral...

Mofezolac (N-22) is a new developed analgesic and anti-inflammatory agent. A teratogenicity study of N-22 was carried out in New Zealand White rabbits to examine the effect on the dams and the teratogenic potentiality. N-22 was administered orally at the dose levels of 12.5, 50 and 200 mg/kg during the organogenesis from day 6 to day 18 of gestation. All pregnant females were sacrificed on day 28 of gestation and their fetuses were examined. There were no growth retardation and teratogenic effects on fetuses from the dams administered N-22, although the administration of 200 mg/kg produced a decrease in food consumption of the dams concomitant with the embryocidal effects as shown by an increase in the early resorption rate. Thus, non-toxic dose level of N-22 on the dams and fetuses was considered to be 50 mg/kg.