Doctors can and will prescribe anything that they BELIEVE to be necessary. For example, I take Risperidone 1 mg because I worry a little bit, and when I skip the dose I feel fine. In other words, I do not really need it. And the doctor was wrong (she keeps me on it still, 4 months later, even though I get tremors, feel dizzy for at least 1-2 hours a day and get a metallic taste in my mouth at irregular intervals)... in other words...she's a fuckwit.
So that's really all. Just tell your doctor that you want some pills and say why and... if you can convince them by acting that you need it, you get it (my situation is different; I did NOT want to take the pills and now that I do I experience inconvenient, irritating, harsh side effects)..