Is it possible that my baby's birth defects are from me taking zofran (ondansetron) while pregnant?

Zofran (ondansetron) and pregnancy: Need more information. what are your baby's birth defects? Zofran (ondansetron) is category B in pregnancy and is thought to be relatively safe, however, the safety of the drug for the fetus is still under study.

Zig ran: a study published in February 2013 found no significant risk of adverse fetal outcomes. Hope this answers your question