While I do understand the risk of driving the matter 'underground', it is quite obvious that many side effects of anti-depressants are not conducive to flying.
As far as I can see, many of them are quite hard to observe in a 5 min consultation (or even a 30 min consultation), and it's hard for the taker of the particular drug to tell that he/she is affected. Difficulties with assessment of fitness-to-fly while being on such drugs should be taken into account and perhaps would be better to play on the safe side?
Obviously the best thing would be for stigma attached to psychological/psychiatric condition to be removed and also to have suitable loss of medical cover be arranged in advance so as not to have the 'pressure not to tell'. I guess that would be the ideal world and the world isn't so ideal.