Iv'e been on 2mg of Buprenophin since Sept. 2013. Chronic back pain. I cannot take anymore than that because of the side effects (Horrible). I have a Baker cyst on my right knee. I would like to know if I can have the Dr. use Exparel (numbing my knee) so I don't have to come off of Bupreonphin. I don't want to take pain meds because they do absolutely NOTHING for my back pain!!! Help!! In the case that I do have to come off of Buprenophin, how long does it take to be completely out of my system, so the pain med can take effect on my knee? Sincerely, Renee