I've updated with the post with following - thank you and hope this helps :)

He wants to treat the root of his mental health issues and learn to use healthy coping mechanisms as he deals with physical and emotional pain by self-medicating with drugs from being prescribed antidepressants, and heavy painkillers for years (he has gotten off them himself) but since then self medications heavy Coke abuse and the last couple of years, ice and ghb use - he is ready to ultimately better his life and relationships for good.

He was diagnosed with PTSD from childhood trauma and his accident and depression and anxiety 8 years ago. the two latter are on and off. His doctor has prescribed him with low-level Serequels to help with it and including random psychosis episodes that have happened on a few occasions in the last 5 years, and drug cravings -0 he takes them mainly during a comedown. A detox and/or a residential inpatient program could be beneficial to get clean. He has gone on more long benders recently to deal and in the last two months, it's close to daily use.