Holly takes this when we fly. She said that it does not get rid of the scarey thoughts, it just surpresses the physical reactions. You don't get the butterflies, your muscles don't tense up.
I took it once to calm down after a really bad work experience (I know, bad taking other people's medicine...). It felt like the stress was draining away, feet first. I felt great.
If you stick to the prescribed dosage, you will be fine. Take too much, or mix with alcohol or grapefruit juice(no kidding, the package said so) and you can get tipsy.
Ted