i used antidepressants for 2 years, the only side effect i had was that when i sat down my leg would shake a little, not a big deal just meant i couldn't pull of "the thinker", i think its fine that you try and do what you think is right by warning other people, but there are plenty of different antidepressants, and endless variables to consider, not everyone will have side effects especially not at lower potents.
I think a reason that that many people at your gymnasium wants antidepressants is because they don't know what they do, they don't make you happy, some people seem to think of them as this wonderful drug that makes you happy and fills the world with rainbows, and best of all its legal and sometimes the government will even pay for it, its free meth for the working man.
But they do help allot of people, and every psychiatrist that would give them a receipt will also warn them about the possible side effects, you don't need to run around and warn them.