Someone I Know That Is Close Is Coming Off Fentanyl(but

someone i know that is close is coming off Fentanyl(but using it as like heroin ways i guess), ummm he gets tripping thinking people are looking for him and ut to get him, we had him in the hospital for a few days but im not quite sure how that was helping cause i think he should have gone straight to a detox/recovery house for abit, cause hes with family which is helping in a sense but he wont listen to us, what about pot will it help (seriously cause he aint been using that crap fentanyl, but beer and isnt that a trigger too?? please help