If you are allergic to morphine can you take oxycodone?

Yes, this is possible. But rare/unlikely. It depends on how severe the patients opiate allergy is. Point to prove it can happen. My girlfriend is allergic to codeine, she gets a skin rash and the worst itch possible all over the body. She was prescribed vicodin by her dentist after wisdom teeth surgery and he did not have her allergy to codeine in her patient file. She doesn't have any clue that vicodin is an opiate nor the codeine. I call her on my lunch break that day to see how everything went. She tells me... Good and he gave me some pills for the pain. I asked. What!! (Knowing her allergy). She said don't worry they didnt give me Tylenol #3 they gave me vicodin and its working fine i took it almost 6 hours ago. So there you go. Codeine which is much weaker than hydrocodone and derived from the same main ingrediant as all synthetic opiates. Hope this helps.. if not i can better explain i guess if needed.