I’ve tried suboxone in the past for a crutch when getting off oxycodone short periods.   No more then 14 days in a row.  Which was once able to work with Oxy. But not with fentynal.  Puts people into presipitaited withdrawal.    

Methadone I have only used as a crutch when taking oxycodone years ago.   Haven’t taken Oxy for 4 years.  Just illicit fentanyl 