By the way, I've been a member here for years, I just don't usually post as I really don't have enough info to add about these different OPs because as I don't have any experience with many of them. I too like to read a lot about pharmacology before I take anything.
I crushed my fifth lumbar vertebrae to 55% it's former height three years ago and the doctor prescribed me 30 NSAID's with something to help my stomach, and two single Silece (ie; the date rape drug, Rophynol). Maybe he wanted to rape me preferring his victim in pain? As you can guess, it didn't take long before I crawled to the computer and started looking around for a stronger pain killer. In Japan doctors are afraid of prescribing opiates, at least the one I went to. I think most doctors would agree with me that something stronger than Advil or Motrin was called for!! To this day, I still have never gone beyond codeine or DHC as I do not have access and the pain is rarely that bad anymore. It is probably just as well I have no access to anything else as I'd likely enjoy it too much and get addicted.
Also, I just googled this up by typing in "Panlor" and it shows I was wrong, the two drugs mentioned above by others are indeed Dihydrocodeine and not forms of hydrocodone:
PANLOR DC (OBSOLETE)
Generic Name: aspirin/ caffeine/ dihydrocodeine
Brand Names: Panlor DC (obsolete), Synalgos-DC