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1) Should we edit out all overdoses?
I think that yeah, overdoses should be edited. I have been triggered by them and you're right it can inspire ideas, such as to take even more than that user did, or to find out that x amount is deadly.

2) Should we edit out all amounts?

You're right that we aren't doctors. For some medications like over-the-counter stuff, just follow the directions on the back of the box/bottle and it should give you a recommended dosage. You can have someone saying that taking more than prescribed or something is fine. But this one I'm on the fence about and could go either way, so I'll wait for more opinions.

3) Triggering-prefix all amounts?
Well, I think overdose amounts should be edited, so. If they're edited they wouldn't be there anymore to have a prefix.