I'll only chime in b/c I've had the misfortune of not catching it in time. If you're close to someone that is always depressed, it's hard to tell what a bad day is. vs EMS, where you can pick up on it, having just met someone, by their demeanor and how they talk, general attitude, etc. In my experience, a person was always, deeply, depressed. Then one afternoon, it stopped, friendly, smiling, wanted to spend time with me. A person often decides that suicide is the only solution, to a problem they cannot solve or they feel there is nowhere to turn for help. It's not easy to ask someone if they're feeling like they may hurt themselves; or likewise, one may not know how to tell someone else they need help.
Medications mask true feelings, talking with someone that is specifically educated in mental health, is the key. Yes, continue medications, but they alone, will solve nothing. I missed a very blatant sign of trouble, and for the past seventeen years, I've regretted that every single day. If it's mutual, that verbal counciling will take place, you're well ahead of the game, per se. Good luck.
Adding more.. Around here, if someone is seeking help, they have to go through the ER. It's a personal struggle to seek help, and one may say it's more difficult than it should be. It's embarrassing, people feel ashamed, judged. I feel that my experiences help me to be a better provider, b/c folks don't want advice most of the time (in the ambulance), they just want an ear.