High-sensitivity C-reactive protein (hs-CRP) is positively associated with the prevalence of coronary artery disease by epidemiologic data. Prospective studies indicate that 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors reduced the plasma hs-CRP concentration and the risk of recurrent coronary events after myocardial infarction. Type 2 diabetes is associated with high mortality risk of coronary heart disease and this high risk may be involved in the inflammatory factors. We have therefore conducted a prospective study to assess whether simvastatin can rapidly reduce the plasma hs-CRP concentration in type 2 diabetic patients with hyperlipidemia. Seventeen type 2 diabetic patients with hyperlipidemia were enrolled in the study after 6 weeks on a lipid-lowering diet. Fourteen patients completed the study, taking simvastatin 20 mg daily for 8 weeks. Fasting blood samples were collected from each patient before and after 8-week administration of simvastatin. In response to 8-week administration of simvastatin, hs-CRP levels significantly decreased from 0.312+/-0.057 to 0.193+/-0.045 mg/dl (P<.01). Plasma LDL cholesterol also decreased significantly from 130+/-9 to 74+/-3 mg/dl (P=.001). This study shows that plasma hs-CRP concentration can be reduced by 8-week administration of simvastatin in type 2 diabetic patients with hyperlipidemia.