With all of your GI issues, sticking to the Butrans patch was probably a better fit for you. I have not heard that Nucynta was that potent. The Butrans patch is a step down from Fentanyl in terms of strength. Issue is the patch contains Buprenephrine in a range of low doses. Suboxone/Subutex contains Buprenephrine in much higher doses but it is tailored more for the treatment of addiction.
The Opana ER you were prescribed is the strongest pain medication in pill form based on pharmacology. The problem could have been the dose was not strong enough for you. Doses go up to 40 mg bid and some take it tid if determined necessary. What was your dose on Opana ER?
Keep in mind, Opana ER has been reformulated with plastic binders so that they can't be crushed and snorted. Many are discovering the medicine isn't as effective as it was before alteration. So sticking with the Butrans patch or the Nucynta ER might be a safer route. However, some claim Opana ER is 1/2 as effective so perhaps taking 2x the dose of the new formula would equal the old formula and provide adequate analgesia??? This all depends on what dose you were on previously. If you were on the 40 mg tabs, your doctor would be very relunctant to double up on that high of a dose. And there is always a chance that it could be effective for you at a therapeutic dose that is comparable to the dosing that would have been therapeutic under the old formula. Unfortunately, some doctors that prescribe Opana ER like to prescribe it at 5 mg or 10 mg bid which is equal to approx. 10 mg or 20 mg bid of oxycodone, respectively. This is fine as long as they are open to titration once the initial adjustment period is over. Some doctors are not open to titration. Is this similar to your scenario?
The fact that the Opana ER didn't cause you significant stomach distress, as you state you stopped taking it because it didn't work not because it was causing GI stress, is probably why the doctor thought Nucynta ER would be a good fit for you. Typically, patients with a lot of GI issues have to stick with only immediate release opioids and long acting meds in patch form. Some have ended up in the ER after ingesting just one Opana ER pill.
I hope the Nucynta ER helps. Please let us know how it is working for you. I have read that its chemical makeup is similar to Tramadol but much stronger...similar in strength to morphine. Whereas, Tramadol is similar in strength to codeine.