Worried about a mate

Im looking for a bit of advice as I really don't know what to do. This isn't one of them 'I have this friend' when really its me, this really is my friend who I am worried about.

He takes a lot of drugs, He has pretty much stopped though I think but his head is not right. He has been getting into a lot of trouble lately, Threatening his parents etc and has been forced by them to go and see doctors etc who have given him medication.

I was out with him on the weekend for the first time in months and he seems really bad. He told me he is not taking his medication and he has all these dreams. Its like he is living in a fictitious world.

The thing which worries me is he just casually told me on Saturday he tried cutting his wrists a few days previous. This really schocked me.

Im looking for some advice on what I should do. Should I tell his parents about this? Or do I leave it? I would be racked with guilt if something bad happens and I never said although I am really socially anxious and wouldnt know what to say to his parents?

Sorry if this is in the wrong forum section.

Thanks for any advice.

In my opinion he's crying out for help. If it were me I would tell them. But it's a decision you have to make for yourself.

__________________
Warning! Fox News is not White house approved.