The results revealed that the plant extract showed a significant induction of sperm abnormalities at the three concentrations used comparing with the untreated animals. The administration of a single injection of 0.767gm/kg of C. roseus extract to twenty pregnant females mice on the day 10 through 16 of gestation period did not show any apparent malformations. However, compared with the control population of the pup's number, body length, and head length was significantly reduced within the first day of life. Overall, those finding indicate that Catharanthus roseus aqueous extract can induce significant mitotic inhibition, slight chromosome aberrations and micronuclei frequencies and it can bring about significant percentage of abnormal spermatozoa, besides its ability to cross placental barrier causing some growth retardation; rather than teratogenic effects.