Brother Addicted To Meth

My brother is 23 and still lives with my parents. He was quite the spoiled brat as he got everything he has ever wanted growing up. Even to this day he gets into trouble and the parents bail him out of it. We always used to be close growing up, but now it seems as if we dont talk much at all. Within the past 2 years, he has been on and off meth. At least that is what I think is going on. He can be doing great for a short period, then it seems he starts screwing up. He loses a bunch of weight, stays up for days, goes into the bathroom for long periods of time and all you can hear is him sniffing and coughing. He has been coughing up blood too according to my mom. He was confronted by me and my mother many times and he swears he is not doing speed or any kind of drugs. He was doing good for a little while, then he and his girlfriend broke up and he is back to the same stuff again. He is really irritable, can be violent and short tempered, extremely skinny and looks terrible. He will stay up for days again, then comes home when he wants to crash for the day or two. I am not sure how to help him. I have called him asking him to have dinner with me just to talk and he wont call me back. He hides when I come over and wont talk to anyone. I dont know how to help him. I cant make him go to rehab but he is killing himself and I cant bare to watch it any longer. My mother is a wreck over him and yet we are all sitting back letting it happen. I dont want anything to happen to my brother, but I am lost on where to begin to help him and if I can. Any suggestions from anyone who is going through this problem would be great.
There isn't anythign that you can, he has to want to get the help.

I do wonder about the role your parents are playing in supporting his addiction. Keeping him clothed, fed and sheltered when he is actively using is enabling ebahviour that makes it easier for him to be an addict,

I recommend Nar Anon Family Group meetings for you and your parents, I wish you the very best.