Suggest Ways Of Managing Pain

Hello my name is Donna and my husband is on pain management, he takes Roxicodone 15's and his pain level has increased and has to increase his morning intake and there fore he is running out of me Roxi, before his nes appointment he also has a prescription from before of Percocet and he gets drug tested when he goes to pain management doc. If he were to take the Percocets would it prevent him from passing the drug tests, I know both drugs are codone but the percoet has acephad. (tylenol in it) but I don't know about fillers that may show up ina drug test, He can not past this drug test with pain management doc, he has severe back problems and legitamely needs these meds to not die with paina nd function daily So will taking the percocets interfer with his drug test resultsmaking it a different results than with the Roxi?