Unfortunately, it is up to your brother to want to be clean and stay clean. You can support him in those efforts by being there to talk with him, when he's not high, or offering to come get him and spend time with him when he needs a fix. You can encourage him to join NA. What I would strongly suggest is that you in no way enable him. Don't lend him money, if you know it's going to be used for drugs. Dealing with addicts is hard, you need to remember to look after yourself too, in this stressful situation.

--splitimage