Getting the facts
If your pain is chronic and severe, your doctor may prescribe opioids — the heavy-duty narcotics that include morphine (Kadian, Avinza), oxycodone (OxyContin, Percodan, Percocet) and codeine, among others. These drugs are the strongest pain relievers and the most reliable. They work by attaching to opioid receptors, blocking the perception of pain. They can also be addictive.