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A teratological study was carried out in New Zealand White rabbits in order to examine the teratogenic potentiality of HPMCAS, a useful pharmaceutical excipient. HPMCAS was orally administered at dose levels of 625, 1,250 and 2,500 mg/kg/day for a period of 13 days from day 6 to day 18 of gestation. All pregnant females were sacrificed on day 29 of gestation and their fetuses were examined. The administration of HPMCAS during a period of organogenesis produced no embryotoxic and teratogenic effects as well as no influence on behavior, appearance and growth of animals.