I just don't know what to do, or if I'm worrying unduly
Having actually looked up the side effects of taking alcohol while on anti-depressants, I'm getting a bit worried about my friend. And when I say friend, it's not code for me, there actually is a real friend.
While I don't know for sure that he's on anti-depressants, I do know that he has been depressed in the past, and that a few recent experiences fit the effects of mixing booze and drugs. I'm just not sure whether I should bring it up, given that I'm the only one down here that knows he has been depressed (as in tried to kill himself) in the past. I could always ask his sister, but she doesn't live here and I may be making a mountain out of a molehill.
Which is the crux of the problem. I don't know anything is actually wrong, I'm just getting a bad feeling. I don't see the signs of depression as such, so hopefully I'm worrying out of turn. It's just that I've actually been in a situation in the past where I didn't react to the signs, and it turned out badly. I was the last non-family member to see someone, and I knew they were acting a bit 'off', but figured everyone is a bit up and down at times, so didn't say anything. The next day, he killed himself. It turned out he'd had depression for the last fifteen years. His wife & sister knew, but neither the kids or anyone else did. I'm not saying it would've made a difference if I'd said anything, but it's too late now eh.
I don't see this situation as being the same, just merely a case of questioning a behavioural trend. I'm sure if I were to confront the person, they'd be annoyed about it, and annoyed at their sister for telling me.