I prefer Oxycotin or Ms, of course that's why I don't take it anymore...I Like it to much.
Seriously some people have a very high tolerance for some type of meds. Vicodin (Hydrocodone) never worked for me, so they always used Percocet(Oxycodon) instead, at least tell I built to much of a tolerance.
just a word of warning, all that shit can be addictive as hell, and I'm speaking from experience.