Oxycodone Apap, is oxycodone HCL with tylenol (Percocet, etc) and Oxycodone HCL is the same thing without the tylenol - pure oxycodone (OxyIR, Roxicodone, etc). HCL just stands for Hydrochloride (oxycodone hydrochloride), the way the oxycodone base is formulated - it's referred to as the hydrochloride salt of oxycodone, but don't worry about that, it has nothing to do with salt like table salt - just a way the oxycodone is produced so it will be stable and will dissolve well and get absorbed effectively. Most oxycodone is produced as oxycodone HCL

Oxycontin is also oxycodone HCL - but it is time-released. It is available in 10, 20, 40 and 80mg tablets (also used to be 160mg). If you are getting a 5mg tablet, it is immediate release oxycodone HCL, the same as Percocet - only without the tylenol. If you feel the tylenol helps, you can take some plain tylenol along with the oxycodone HCL (don't exceed 3000-4000 mg a day of tylenol - the less the better because tylenol can be hard on the liver) - but don't take tylenol along with oxycodone apap since you'll get getting a double dose of tylenol!

Pure immediate release oxycodone HCL isn't made in 7.5mg strength in the US, so that's why they gave you 5mg - but they should have allowed you to take 1 1/2 tablets of the 5mg so you'd still get 7.5mg. There is no danger to breaking or cutting an immediate release oxycodone tablet in half - they just put those "don't crush or chew" warning on all opiates now so that people don't try to abuse them and get a rush by doing that.

As far as marmar's answer-it's not quite right (Sorry marmar- no offense, just want Feebs to get all the facts straight-OK?) : The HCL has nothing to do with aspirin or controlled release, and apap has nothing to do with immediate release (it refers to tylenol), although controlled release oxycontin doesn't contain apap so if you're getting oxycodone apap you know it's immediate release. And there's no substitution going on here, since oxycodone apap and oxycodone HCL have the same main active ingredient - oxycodone HCL. The only difference in your case is no tylenol, and the lower strength (ask your doc about taking 1 1/2).

This can be confusing and all those darn internet drug suppliers makes it hard to find accurate info. Try drugs.com next time rather than a Google search.

Jim