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A teratogenicity study was carried out in S1c: SD rats orally administered Hydroxypropylmethylcellulose acetate succinate (HPMCAS), a useful pharmaceutical excipient, at dose levels of 625, 1,250 and 2,500 mg/kg/day for a period of 11 days from day 7 to day 17 of gestation. Two-thirds of the pregnant females in each group were sacrificed on Day 21 of gestation and their fetuses were examined. The remaining dams were allowed to litter naturally, and the postnatal development of the offsprings was observed. The incidences of external, internal, and skeletal anomalies were not significantly increased in the fetuses of any treated groups. HPMCAS caused no effects on parturition, lactation, postnatal growth and reproductive ability of the male and female offspring.
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