You just need it for the flight, you take one half an hour before the flight. You can research the basic biological mechanism online but the practical effect is

You just need it for the flight, you take one half an hour before the flight. You can research the basic biological mechanism online but the practical effect is that your body just doesn't react to fear, which allows you to deal with the mental anxiety much more easily. I really hope you'll ask your doctor about it. As a fellow nervous flier I know how miserable it can be to be trapped in the pain tube at 40k feet for hours and have every little noise and bump set you off. It seriously changed my life - after a few really bad flights, I started getting stressed out when I saw a plane in the sky while I was standing on terra firma! But not anymore. And these days, after way too many flights, I barely even need it anymore!