I think that it is a bad thing to take medicine that you don't need. This is basically because it weakens your immune system. Therefore, your body cannot function properly without them and this may lead to addiction.
most prescribed drugs are very powerful psychotropics. No matter what you have, psychotropics will detach you from reality, Dream state, Disconect part of your brain that relates you to emotions. Basicly makes you like a zombie, sort of. psychological wise.