Clobazam is commonly given to people with epilepsy and is often used together with Zen Retard under medical supervision. Since your doctor suggested a single 10 mg dose before the flight, it is generally considered safe when taken as prescribed. The medicine may help reduce anxiety, stress, and the chance of seizure triggers during travel. You may still feel sleepy, dizzy, relaxed, or less alert after taking it, so avoid alcohol and do not drive or perform activities that require full attention. Continue taking your regular epilepsy medicine on time and do not change the dose on your own. Reading side effects online can be worrying, but many people take this combination safely when monitored by a doctor. Seek medical help if you develop excessive drowsiness, breathing difficulty, confusion, or severe weakness after taking the tablet.