I saw a lady who'd tried to kill herself, pretty seriously, with paracetamol and strong opiates and alcohol.
After being ventilated and coming out of intensive care, it was clear she wasn't clinically depressed. She'd had low mood through relationship changes, chronic pain, changes in health, her GP'd started an antidepressant last year but it hadn't helped. A sensible thought to try one, but not surprising it did nothing, given she was low in mood through reacting to grim life situations, not through endogenous clinical depression.
We talked for an hour and a half. She wasn't mentally ill. She was psychiatrically fit for discharge. She went home to her husband with numbers of our crisis team (which she'll never call) and an appointment with our psychologist, which hopefully will afford her changes in perspective, acceptance and alternative ways of coping that're useful, enabling her to feel she is equipped to manage.
I stopped her antidepressant. Sometimes suicide isn't about clinical depression. Sometimes it's not a mental illness, sometimes it's a choice. But I hope she'll choose a different way.