this drug is called Zetia. I have read that there is a risk of muscle injury with it too....but...here are the FDA medwatch reports for it:

http://patientsville.com/medication/...de_effects.htm

I used this for 6mos, and got no changes. In fact my cholesterol went UP. I did have some GI upsets with it too.
But it does work for some people.

It appears that the muscle damage side effects are lower with Zetia. Some of the effects on that site, reflect the other drugs the patient was also taking. So the single users are more
accurate IMO.

You might find Dr. Cohen's book very helpful~~
My doctor wanted to read it in fact! So I loaned it to her. I probably will never see it again.

http://www.medicationsense.com/statin_drugs_book.html

In this book are explanations of other factors that may be more predictive of cardiovascular incidents than cholesterol levels:
c-reactive protein
lipoprotein A
inflammation
low intake of antioxidants