I was wondering?? will fentanyl work with methadone, since its a synthetic opiate like methadone. methadone has a opiate, and opioid blocker so if your on 80 mg and up......not even pure heroin will get you high. you will just get a burning feeling throughout your body and od, if you do too much. the messed up thing is... only taking more methadone will get you f**d up. what about fentanyl?? its in the same category as methadone, as a synthetic opiate. will i still be blocked??