A new pyrimidine derivative was prepared by reaction of Pyridimine-4,5-diaminewith 3-Phenyl propanal in good yield. This new Schiff base was characterized by elemental analysis, Infra-red and Proton Nuclear Magnetic Resonance ( 1 H-NMR) spectroscopy. The toxicity of the compound was also assayed via the determination of their LD50 value by using Dixon method. LD50 of the novel compound was 618.75 mg/Kg BW when administered Intraperitonially. In Atorvastatin has been used as a controlled drug for the treatment of HFD-induced hyperlipidemia as improvement drug, both atorvastatin and pyrimidine derivative prevented the increase in serum and hepatic levels of total cholesterol (TC), total glycerides (TGs), low density lipoprotein (LDL-C), and increased serum and hepatic levels of high-density lipoprotein (HDL-C) in HLDfed rats. The results of the histopathological study of sections of the liver of the study groups confirmed their conformity with the physiological study.