"the 10 mg generic norco works for me for about an hour and a half. since i had my gastric bypass surgery  , pain medication seems to not help my pain as well as they use to and most definitely, not near as long. i have only taken norco, percocet and oxycodone, which i found the oxycodone not only relieves my pain better, it seems to help the pain a bit longer than the others i have tried"