My friend is suicidal and I don't know how to help

First off, if I am breaking any rules or there is a better sub for this, please let me know.

I'm talking with him now. I've given him the suicide prevention hotline number. I'm trying to make him think about how this would affect his children. I don't know what else to do.

Please, advice from anyone who has helped a friend through this type of situation.

He isn't actively trying to do it this very moment but he attempted about 2 weeks ago. He started to prepare for it today but threw away the method.