pain
"Opana ER is the 1st ER medication that I've tried that actually works for an extended period of time. And I've had to try many for my severe back and neck injuries. One 20mg pill will last at least 8 hrs, and I work long 16 hr days so that's a very good thing. I highly recommend it for people with severe problems/injuries. I definitely wouldn't recommend it for just mild to moderate pain problems or acute problems. Most ideal for people with chronic severe injuries who also work a lot."