You may bring medically necessary liquids, medications and creams in excess of 3.4 ounces or 100 milliliters in your carry-on bag. A rule of thumb: Bring no more than a 90day supply of medication.All prescription medicines are allowed on airplanes, whether in a carry-on or checked bag. You can bring your medication in pill or solid form in unlimited amounts as long as it is screened. Most medications are allowed on planes. There are some exceptions to flying with medication, which we'll cover below. You can travel with prescription drugs or medication in both carryon and checked baggage. Pilots must carefully consider both medication(s) use and the underlying medical condition(s) as either can compromise safety of flight. Texas Controlled Substances Act — View the full text of the state law governing drug offenses in Texas. Prescription medications (with a few exceptions), in addition to the remaining balance in the individual's trust fund account.