Agree with everything Freemason has stated so far.
From top to bottom:
Fentanyl
Heroin (illegal, but is in fact an opioid)
Dilaudid
Oxymorphone
Methadone
Oxycodone (studies suggest there is no remarkable difference identified either in analgesic efficacy or in tolerability between oxycodone and morphine)
Morphine
Hydrocodone
Codeine
Meperidine (ie Demerol)
Tramadol (centrally acting synthetic opioid)
I would stay away from these drugs, as they can lead to cardiac arrhythmias, depress your respiratory rate and ultimately lead to death. They can also cause terrible constipation, which sucks. Additionally, long term use can mess with your hormones (Testosterone).
If the pain you're experiencing is more muscle or bone related by way of inflammation following say Orthopedic surgery, consider alternating between Acetaminophen (up to 4 grams per day, say 1000mg every 6hrs) with an NSAID (Naproxen can work, but if you can get a healthcare buddy to start an IV, Toradol works like a charm) throughout the day.
Anyhow, best of luck!
"1"