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Strain differences in phenobarbital-induced teratogenesis in mice.

Anticonvulsant drugs are widely prescribed medications known to complicate more than 11,500 pregnancies each year in the United States. Although there is no clear consensus as to the teratogenicity of all of the clinically available compounds, it appears that most anticonvulsant drugs can induce congenital abnormalities in susceptible individuals. In a study designed to examine the role of the genotype on sensitivity to phenobarbital-induced malformations, three highly inbred mouse strains (SWV, C57BL/6J, and LM/Bc) received the drug via chronic oral administration. Phenobarbital was found to have a significant teratogenic potential in mice, resulting in skeletal, cardiac, renal, neural, and urogenital defects in a dose-related fashion. The LM/Bc strain was most sensitive to phenobarbital, with 46.7% of the fetuses exposed to the highest maternal plasma concentrations having malformations. C57BL/6J fetuses were the most resistant strain, with only 28.6% abnormalities.