Oxycodone
"I had to go onto Oxycodone as I became allergic to buprenorphine patches & reached the limit of how much morphine I could tolerate.  With Oxycodone my pain relief is better than morphine, the migraines are still a problem but less 'sharp' than when I took morphine.
As I live in England I am able to take oxycodone as an extended release drug called 'Targinact'.  It is a combination of oxycodone but also naloxone, which elimintes the biggest problem with opiates.....constipation.  Targinact works amazingly well - I can take oxycodone in high doses but with no constipation.  It is a shame that it isn't available in the US.  Although it is more expensive than oxycodone, all my prescriptions are free thanks to our wonderful healthcare system."