My Dr prescribed 1 mg of Lorazepam to help me on an upcoming flight from Atlanta to London (in 5 days). I have taken Xanax in the past, but never Lorazepam. I tried it last Sunday night at bedtime (a week ago), and within the hour, I was out like a light. I didn't wake up during the night like I always do; instead, I slept for a good 7 hours. I told my Dr that I was starting to wake up at night and get panicky about the upcoming flight, so he told me to take 1 at bedtime from then until I leave. I have only taken it twice because I am afraid of running out. (He gave me 30). Last night I took one around 9:30 and it did not knock me out. I had no problem falling asleep but woke up during the night to go to the bathroom (which is my normal routine). I had no problem going right back to sleep, and had no problem getting out of bed this morning. On the day of my flight, I am worried that I will be so panicked that I will refuse to get on the plane, which will be a major disappointment not only to myself but to a big group of friends that are going on this trip. And that's not even saying anything about the $3,000.00+ that I have already spent for this trip. Can I take 1 mg of Lorazepam during the day? What would happen if I took 2 on the plane? I would really like to just go to sleep on the plane and wake up 8 hours later at Heathrow. I have also heard that it's important to walk around on a long flight, so that you don't get blood clots - something else for me to worry about. I am absolutely terrified of having a panic attack on the airplane - it's happened before and was the worst thing I can remember. I guess I don't trust the Lorazepam yet. Thank you for any advice or answers.