Who do you get help for a mentally unstable person that does not think the need help?

Let me start by saying that I, for one, appreciate your wishing to understand someone else's mental state. I've been suffering with Major Depression for 6 years now and with the help of medication (which I avoided for a very long time) I've finally been able to make some progress in my life. The best thing to do is simply be their friend. In all actuality, (unless of course you're a psyciatrist) there's not much someone can do. Just be there for them. Help them make psych appointments (alot of depressed people will avoid social contact. Calling people on the phone may not appeal to them) or hang out with them when they're feeling blue. Let them know you love and care for them, often. It's honestly one of the best things you can do. Try not to focus so much on things you can do to 'fix' them.; you'll only let yourself down. I mean, face it, if they're mentally unstable there's nothing you can do in your own power to change the configuration of their brain. I'll leave you with these last couple things you can do. Do what you can to make sure that this person gets medical care. Encourage your friend or loved one to stick with his or her therapy or medication. Offer to go with him or her to appointments as support. Also, be supportive and patient. Listen to what the he or she has to say.

I hope you have found something in this to be helpful. Keep it up.

If someone you know is thinking about suicide, don't ignore it. Do whatever you can to get help for that person. Get in touch with his or her doctor or therapist.