Simvastatin is a competitive inhibitor of HMG-CoA reductase with Ki of 0.1-0.2 nM .
Target: HMG-CoA reductase
Simvastatin inhibits cholesterol synthesis in mouse L-M cell (fibroblast), rat H4II E cell (liver), and human Hep G2 cell (liver) with IC50 of 19.3 nM, 13.3 nM and 15.6 nM, respectively. Simvastatin treatment leads to a dose-dependent increase in serine 473 phosphorylation of Akt within 30 minutes, with maximal phosphorylation occurring at 1.0 ?M. Simvastatin (1.0 μM) enhances phosphorylation of the endogenous Akt substrate endothelial nitric oxide synthase (eNOS), inhibits serum-free media undergo apoptosis and accelerates vascular structure formation.
Simvastatin influences inflammation independent of its effect on plasma cholesterol level. In cynomolgus monkeys consumed an atherogenic diet, Simvastatin (20 mg/kg/day) induces a 1.3-fold less macrophage content in lesions, and 2-fold less vascular cell adhesion molecule-1, interleukin-1beta, and tissue factor expression, companied by a 2.1-fold increases in lesional smooth muscle cell and collagen content.

HMG-CoA Reductase(HMGCR)
Atorvastatin
Fluvastatin
Lovastatin
Mevastatin
Pitavastatin
Pravastatin
Rosuvastatin
Simvastatin