Medications in pill or other solid forms must undergo security screening. You may bring medically necessary liquids, medications and creams in excess of 3.4 ounces or 100 milliliters in your carry-on bag.All prescription medicines are allowed on airplanes, whether in a carry-on or checked bag. You can travel with prescription drugs or medication in both carryon and checked baggage. (B) The pharmacy may dispense a controlled substance in. It totally depends on the prescription, the state and the pharmacy. The FDA will allow foreign nationals to bring or ship a 90day supply of drug products. For example, Alabama lists "all" for covered employers. What if my prescription drug is a controlled substance? See the State Labor Offices for information about leave laws in your state.