In this study we investigated nitric oxide metabolites nitrate+nitrite and lipid peroxidation product (malonyldialdehyde: MDA) related to the pathogenesis of eclampsia and intrauterine growth retarded (IUGR) pregnancy. Plasma nitrate+nitrite levels were higher in the eclamptic (31.6 ± 16.7 μmol/L p < 0.001) and IUGR (24.3 ± 9.5 μmol/L p < 0.005) groups than in the control group (18.8 ± 6.9 μmol/L). Plasma MDA levels were higher in the eclamptic group (5.5 ± 2.5 nmol/ml (p > 0.05) but not significantly different in the IUGR (3.4 ± 2.4 nmol/ml p > 0.05) group than control group (3.0 ± 1.3 nmol/ml). In addition, the plasma nitrite+nitrate and MDA levels in the eclamptic group were higher than in the IUGR group (p < 0.05). These variations could play different roles in the pathogenesis of eclampsia and IUGR pregnancy.