Hydrocodone (AKA Vicodin) is a medium strength pain reliever. Great stuff if you stub your toe, have a bad headache or something. Roxicet (AKA Percocet) is basically the same stuff only a little stronger (both have acetomeniophen (AKA Tylenol) in them as well).
Here's a link to the NCCN guidelines for adult cancer pain. You may want to print this out and let the doctors know that you demand adequate pain relief.
http://www.nccn.org/professionals/physician_gls/PDF/pain.pdf Pain management is a BASIC PATIENT RIGHT -DEMAND it!
You have to make sure he's not playing this down for some kind of pride issue. Pain is rated from 0-10 with 10 being the worst (it's all explained in the NCCN guidance document -see Pain A 1 of 2). He should given a questionnaire every time he's in to find out what his pain thresholds are. He will also need additional meds for "breakthrough pain".
Taking potent narcotics will also have other issues such as constipation (see Pain D, 1 of 2), etc. These will need to be managed as well. Make sure he sees a nutritionist weekly and also that someone manages his medications.
Personally they gave me Fentaynl patches for "long term" pain and morphine sulphate for "breakthrough pain".