Effect of benzodiazepines on age of vaginal perforation and first estrus in mice.

Female mice which received chlordiazepoxide, diazepam, oxazepam, prazepam, flurazepam, or nitrazepam prenatally and postnatally had delays in the age of vaginal perforation and first estrus concomitant with reduced postnatal growth. Females exposed prenatally showed no growth deficits, but in four treatments had delayed vaginal opening. However, the age of first estrus was generally less than the control.