This document discusses a cohort study examining the risks of the drug ondansetron, which is used to treat nausea and vomiting during pregnancy. The study followed a large group of pregnant women exposed to ondansetron and compared outcomes like abortion, birth defects, preterm birth, and low birth weight to unexposed women. The study found no significant increase in these risks with exposure to ondansetron during pregnancy. While definitive conclusions cannot be made, the results provide reassurance about the safety of using this drug to treat nausea and vomiting during pregnancy.