It's illegal to take prescription drugs without a valid prescription for them. They are considered controlled substances and can result in criminal drug charges. Sometimes they can even be charged as a felony. It doesn't matter that it's perfectly legal to take it under a doctor's orders. If you don't have a doctor's permission you could face serious legal charges. If you're arrested for unlawfully possessing prescription drugs without a prescription, contact an attorney immediately for assistance.
The information on this page is meant to provide a general overview of the law. The laws in your state and/or city may deviate significantly from those described here. If you have specific questions related to your situation you should speak with a local attorney.