Rosuvastatin is a selective and competitive inhibitor of HMG-CoA which is also the main active ingredient in Devastin 20mg. So what does Devastin 20mg do?

Rosuvas Hasan 5 is used in the treatment of primary hypercholesterolemia or mixed dyslipidemia, homozygous familial hypercholesterolemia. So what are the uses of Rosuvas Hasan 5?