Fluctuation of cholesterol levels can bring two different diseases: Hypercholesterolemia (for the case of high cholesterol levels) and Hypocholesterolemia (when abnormally low levels of cholesterol are encountered). Both diseases can link with very serious forms of illness such as coronary heart disease, depression or cancer. In the case of hypercholesterolemia usual cholesterol drugs are: HMG COA reductase inhibitors (atorvastatin- Lipitor, fluvastatin- Lescol, lovastatin- Mevacor, pravastatin- Pravacol, rosuvastatin- Crestor and simvastatin- Zocor), bile acid sequestrants (colesevelam, cholestyramine and colestipol) and also nicotinic acid (Niacin). Also, a healthy life, especially a healthy diet, can help the action of cholesterol drugs. Monitoring the cholesterol levels is also crucial, so periodic testing is very important.