Oh my bad I was thinking hydrocodone.
The immediate release oxycodone can be split, but any extended release med needs to be taken whole, otherwise you end up bypassing the extended release mechanism.
As an aside, during one of my contracts while I was traveling, I took care of this guy who kept chewing up his fentanyl patches. That the doc kept ordering them
knowing he was doing this was ridiculous. The first night I had him as a patient, I applied the patch, taped it down and wrapped his arm in gauze. When I went back to check on him I found the patch in his bed, all chewed up. I called the doc and told him I would NOT be placing another patch on this person. I was written up for that, but I'll be damned if I was going to be a part of his little game.