Sadie: Okay, I’m going to give you the best advice I can, without knowing a lot of details (i.e. their age, if they live with parents or not, if you know where they live, etc). I’ve had a couple of people close to me make suicide attempts; they were all handled differently, and some failed, some succeeded.
You said that they’re already seeing a psychiatrist, but that’s obviously not helping them right at this moment. If you know where they live, get them to call their local suicide helpline. If they refuse (and this is going to sound REALLY shitty, and there are some people that wouldn’t agree with me, but if you’re in fear for their life, then you need to do all you can to keep them from going through with it), then you might need to call their local authorities to intervene.
I’m very sorry, I’m not an expert…I can only speak from my own experiences.