What is the suitable dosage of Xanax to control a panic attack for flying? I usually take 1/2 tablet of 1.5 Lexotanil 1 hour before the flight. It usually calms me down but doesn't totally control the fear especially at take off and landing and turbulence. Is Xanax better than Lexotanil and in which dosage since it's not a continuous treatment? I'm flying really soon and unfortunately don't have time to consult a psychiatrist.