Large scale primary and secondary prevention trials in recent years have revealed that the effective lipid reducing therapy with statins can reduce mortality of coronary heart disease by up to 30%. For the first time it has become possible to reduce LDL-cholesterol pharmacologically by more than 50%, a reduction that was only achieved by LDL-apheresis so far. Cost-effectiveness is becoming an important issue since this varies widely between patients according to the coronary risk. Treating the patients with the highest coronary risk is most cost effective. Currently, there are six statins on the market. Reduction of LDL-cholesterol is mainly mediated by the induction of LDL-receptor activity in the liver. In addition, some statins at high doses also reduce LDL-cholesterol synthesis. Due to variations in the molecular structure of the active compounds these 6 statins have important pharmacological differences, such as their capacity to reduce plasma triglycerides, their interaction with other drugs. The daily recommended doses of the statins range from 0.1 mg (cerivastatin) to 80 mg (atorvastatin). In this review the differences in the pharmacological and clinical actions of the statins are analyzed.