I have no medical credentials and no idea whether this makes any difference to the issue at hand, but Norco is hydrocodone (a codeine derivative), not hydromorphone (a morphine derivative; brand name Dilaudid). They're both strong opiates, but my layperson's understanding is that hydromorphone is stronger. I know this only because a close relative has Stage 4 cancer, and even he treats his Norco gingerly and takes it only for pain relief.