So, the police just stopped you and asked you if you're on medication. This response may save you from getting arrested. It's really none of his business what kind of medication you take. Tell him that you're not going to talk about your medical history without an attorney. A DUI means driving under the influence. And under the influence can be of alcohol or even though you have a prescription for, let's say, Xanax. Xanax might be legal for you to possess and take, but it's not legal for you to be impaired on it and drive your car. Just pay attention to how the medication affects your ability to drive. It might even say that on the label.