Okay, let me get this straight.

A study, done by people who at least in part are employees of the CVS pharmacy chain, has established to a wildly impressive level of significance that prescriptions for (cheaper) generic drugs are more likely to get filled than prescriptions labeled “brand name only.”

Brand-name only prescriptions are 50 to 60% less likely to get filled.  This is the summary of the article on CVS website.

Of course there is a little more info in the first article linked above — like specialists being more likely to write “dispense as written,” and such. Read more on Brand Name vs. Generics — Again and Again…