Sometimes despite what you want people to do it will never happen especially when it comes to addictions until they hit bottom and snap out of it.
When I was 21 I remember a night my mom came into my room and said goodbye to me and dropped a pill bottle on the floor,she had been strung out for a long time and this was her bottom attempting suicide.
We had no phone so I ran 6 blocks to the police station faster than I ever had or ever will run again. She was taken to the hospital where she was kept in the psych ward for a month. In that month she woke up and when she got out she went to college and got a degree in respiratory care.
14 years later she is a well respected member of the hospital staff at which she works and even periodically fills in as the manager of her department.
It can be hard seeing a loved when going through it, but like I said until they reach a point that really makes them want to change all you can do is pray and hope.