Can I buy antidepressants prescribed in another EU state or do I need to see a local psychiatrist for a prescription in Germany?

I have been prescribed with antidepressants before, but not taking them currently. If I develop the need for those medications, though, while studying in Germany, do I have to prove my condition to a local psychiatrist who will then prescribe me, or are there any ways I could get them with my own doctor's prescription? Should I take the printed out versions of my prescriptions with me to Germany? (I am from an EU member state.)