DA-125, a new anthracycline antitumor antibiotic, was administered at dose levels of 0, 0.2, 0.6 and 1.8 mg/kg/day intravenously to pregnant New Zealand White rabbits from day 6 through 18 of gestation. The does were subjected to the caesarean section on day 28 of gestation. Effects of test agent on general toxicity of does and embryonic development of F1 fetuses were examined. At 1.8 mg/kg, the organ weight for ovary of does was significantly decreased. The decrease in the number of corpus lutea, implantations and litter size, and the increase in the rate of resorptions were also observed. In addition, various types of external, visceral and skeletal malformations occurred in fetuses at an incidence of 7.7, 7.7 and 20.6%, respectively. The results show that the no effect dose levels (NOELs) of DA-125 are 0.6 mg/kg/day for does and F1 fetuses.