My best friend just went to a pain management anesthesiologist to have nerves in the right side of his spinal cord burned to give him pain relief from chronic excruciating pain from a catastrophic injury.  The anesthesiologist usedfentanyl and morphine and something called dilaudid (sp?) for pain during the outpatient surgery.  Two hours after the procedure he was in excruciating pain again.  He said the procedure felt like torture.  He got zero sleep that night, was up emailing people about his pain level being astronomical.  What are the drug interaction with those three pain medications, he hasn't been very lucid, doesn't remember repetitive conversations, I'm concerned, will he be OK?
HIThank for asking to HCM I can understand your worry all the Narcotic drugs are same as long as there mode of action are concern beside there potency so the question of interaction in no more there what ever your friend experienced the pain is due to the procedure it self and not due to the drugs hope this information helps you have a good day.