I am going to post a link here that you need to read. It concerns itself with dangerous side effects of common prescription drugs. You absolutely MUST do some home work yourself to stay informed of side effects of prescription drugs. DON'T ever let your doctor just put you on a new or replacement prescription drug without FIRST going home and looking up on Google all the specific side effects so that you will KNOW IF YOU START GETTING THEM.
You can let him or her write you a script for the drug, however I would advise against filing it and starting on it until and unless you look up ALL THE SIDE EFFECTS OF THAT DRUG, AND NOT JUST THE MOST COMMON ONES.