Like "Tinker the doctor only knows what the side effects are, he/she would have no idea how your body is going to react to the medication. Keep in mind that not all patients are honest with their doctors. They also may have several different doctors who have prescribed different medications yet they don't bother to tell the doctors what medications they are taking. It is the responsibility of the patient to ask questions and do as James said, check out the medication online or with a pharmacist before you fill the prescription. We are the ones who has to be proactive when it comes to medical care. "