Comment by WalterBright

Mental health is indeed an inexact and poorly understood condition.

As pragmatic rule, if one is prescribed drugs for it, one is not fit for being a pilot.

I know several people who are prescribed drugs for mental conditions. I would not get on an airplane if they were the pilot. Nor would I get on one with a pilot with a heart condition. It doesn't mean they are bad people, it's just the way it is.