Study showing we should not take extended release meds?

I need to "prove" to my insurance company that I cannot switch my meds from 30mg twice a day to 60mg once a day.  Anybody got a link to a study proving it??  And I HATE how the Ins. company thinks they know more than 2 Drs and a pharmacist!  GRRR I hate Cigna!

I found this site which has some other references. Hope this helps.
http://www.ichpnet.org/professional_practice/clinical_practice_guidelines/

Thanks, I don't know what they need but I think it's pretty dang gutsy to deny a prior authorization form and make someone scrounge for samples because it's not a drug you can go off cold turkey!! The dr is about ready to say try the 60mg and when you end up in the ER they'll have to pay. Fine and dandy if I didn't have the $1500 deductible!!

http://www.medscape.com/viewarticle/545489_6

The 2nd paragraph talks about reduced absorption for extended release medications.  I would think a letter from your Bariatric surgeon stating that you cannot have time released medications would be enough. 

Edited to add:  When my insurance company requires prior authorization on meds I always ask for a 5 day supply to get me by until they get the paperwork straightened out.  See if they would be willing to do that for you since it sounds liek it is a medication you cannot stop safely.  Push the issue if you have to.

I have pushed it, and so has the pharmacist.    Still waiting on the surgeon's letter--this is getting old, fast!!!