Hi thanks for your question .
Norco is combination of acetaminophen
Acetaminophen is nosteroidal anti inflammatory drug wher as hydrocodone is opoid analgesic
.Combination of two is avery strong pain killer. Stronger pain killer than hydrocodone is morphine
and pethidne both are opoids.If you have pain which is not relived by the drug you are already taking,you can request your physicion to increase the dose or prescribe you stronger pain killer like pethidine and morphine.
Hope this answers your question.