Im pretty sure that all opiate
drugs will have a greater more profound effect administered rectally, be careful on dosage, SWIF has had a couple of friends who have administered their usual oral dose rectally and had overdoses.. Luckily none have died but some have come close!
Rectal adminisration works because the large blood vessels in the rectum rapidly and effectively absorb the drug
into the bloodstream. It is similar to insufflation
in how it works however is slightly more effective due to larger blood vessels.
Maybe wait for a confirmation that it works rectally but im 90% sure it will. In how to do this, obtain a plastic syringe (no needle) and put the oxycontin into a solution of saline or water. This is then pushed up the rectum and squirted in. The onset will be quite rapid. The inital sensation will not be pleasurable and many complain of wanting to shit themselves, this will pass in 1 - 2 minutes and is of no worry. SWIF has found to most comfortable position for rectal administration is lying on the right hand side in a fetus like position.
Best of luck feel free to ask any more questions