In Canada, physicians are increasingly recommending coenzyme Q 10 supplements for their statin patients.
This information comes directly from the Prescribing Information associated with these products.
For example, here is a section of the Prescribing Information for Lipitor (Pfizer):
Significant decreases in circulating ubiquinone (CoQ10) levels in patients treated with atorvastatin [Lipitor] and other statins has been observed.
Here is a link to Health Canada (their equivalent to our US Food and Drug Administration) if you would like to download the document yourself.