Ryzolt...opiate agonist? What does this mean in terms of...?

...in terms of pain relief and how this pill will make me feel. My doctor prescribed the extended release 100 mg, once a day. I have had numerous issues with my shoulder for about a year now. I've done some physical therapy and have been prescribed anti inflammatory meds, along with numerous types and strengths of muscle relaxers, usually to strong for me so I use them at night to help rest because they relive the pain but make me sleepy. The new plan is this new prescription to temporarily relieve pain through out the day and night because basically I'm pain 24/7 along with another bout of therapy, then possibly a cortisone shot...kind of looking forward to it (no pain)....forgot to mention I was on steroids for this for about a week and my pain subsided to nothing wich is why we are considering the shot for a longer effect and les side effects than these prescriptions. Now that I've asked a book basically I understand anti inflammatory / nsaids meds, non narcotic pain killers, narcotic pain killers, when I began researching this particular med Its a whole new world, while I will appreciate any answers if any one has a personal experience please let me know what I can expect, I am partially concerned that I do work outside and drive a vehicle to different job sites, I can stay from behind the wheel and from equipment until I know for sure but do I need to be concerned and for warn my boss before I begin this medication.