I believe that the supposed concept behind Tapentadol is that binding an opiate with an SNRI, the pain relieving effects will become extended due to the SNRI.
I can offer two pieces of knowledge to this thread- what this drug does to those I've seen take it and what it did/does to me at different doses.
We are of course discussing brand name
Nucynta.
This was originally prescribed close to when it came out to a friend of mine during the Oxycontin Reformulation period. I believe it replaced a prescribed Rx of 90 OC 10's and at first everyone was pissed. One of the junkies began smoking it compulsively... HIGHLY DISCOURAGING ALL FROM ATTEMPTING THIS.
No snorting, smoking, or shooting these stupid orange pills. I almost puked a few times.
It seems that having a 60mg/day habit of Oxycodone, eating one 75mg of Nucynta is no where near enough to take away withdrawal effects. If I'm seriously jonesing and Nucynta is all I have, taking 200mg will relieve 90% of my W/D and induce a warm, glowing chatty state that is actually VERY pleasurable. The main problem that stands out is that most addicts seem to immediately take more when they recognize they're enjoying any amount of anything. 300mg of Nucynta doesn't increase my miniature nod or help me become more chatty. It knocks me out. Cold. It also lowers the seizure threshold considerably due to the SNRI. I have had some frightful close calls.
Taking doses upwards of 2/300mg can be dangerous. Friends of mine have become incredibly confused; One became so overcome with long-lasting delirium he required hospitalization. The fact that it is not a "pure" or "clean" opiate can definitely bring on unpredictable effects. I would recommend against it. Weird thing is, if I was in full withdrawal from opiates and found 200mg in a drawer somewhere, I would certainly take 100 or 75mg at a time until I felt ok and consider it a Godsend.
75mg of Tapentadol ~ 15mg of Oxycodone
However, 300mg of Nucynta feels a lot more heavy, dirty, and downright dangerous than its seemingly equivalent 60mg/oxycodone
Stay away unless you absolutely have no choice. In this case, approach and dose with due level of caution.