Vince,
I've taken Oxycontin. As with Packer, my biggest side effect was constipation. Be careful with whatever other meds that are being taken though. My doc prescribed a couple of other drugs at the same time, but failed to mention they shouldn't be taken simultaneously. I should have known better, but being in tremendous pain I figured the doc or pharmacist would have warned me about mixing. That wasn't the case. I woke up to minor convulsions, got sick and had a terrible headache. I called a Pharmacist to question the drugs I took and was told the combination could have caused me to stop breathing.