what does crestor do
CRESTOR is a prescription medicine that contains a cholesterol-lowering medicine called rosuvastatin calcium. CRESTOR is used along with diet to: 1  lower the level of your âbadâ cholesterol (LDL). 2  increase the level of your âgoodâ cholesterol (HDL).3  lower the level of fat in your blood (triglycerides).4  slow the buildup of fatty deposits (plaque) in the walls of blood vessels.o not take CRESTOR if you: 1  are allergic to rosuvastatin calcium or any of the ingredients in CRESTOR. 2  See the end of this leaflet for a complete list of ingredients in CRESTOR. 3  have liver problems. 4  are pregnant or think you may be pregnant, or are planning to become pregnant.