My Son Is Getting High On Trazone And Unisom Combination

My son is getting high on trazone and Unisom combination and is a former heroin and fentynal abuse who has had 3 stints in drug treatment facilities. he seems a lot like he was when he was using heroin. Is this combination a new way for addicts to get high?? He is on probation and his last chance now or he will be in jail for a year. What can you tell me, please???