Cypermethrin might present a risk to the human health and environment, due to its wide use in many fields. In this experimental study, 40 mice were randomly and equally distributed into four equal groups. The control group without Cypermethrin and experimental (1,2 and 3) groups that received 5 and 10 and 20 mg/kg per day by oral gavage for 30 days. At the end of the experiment, Tissue sections were prepared from testis and pituitary gland to investigate possible changes occurring in in this organ.