I, too, really liked what Brentus wrote. My only additional suggestion is to not start taking a prn preventively before you really feel the anxiety/panic is building up a lot. The only exception to that may be before something extremely anxiety provoking, like a job interview.

Be careful not to take more than prescribed at any one time or over the course of the day. For example, I have 1 mg Ativan pills. If I feel a panic attack brewing, I take one, not two pills. If one pill doesn't cut the mustard after 45 minutes, only then might I take a second. My psychiatrist allows me a maximum of 3 mg Ativan in any given day. If I think I need more than that it's time to call my psychiatrist. If I find myself using any amount of prn benzo daily, that should also be shared with my psychiatrist.

Also, really try to learn therapy coping skills. There are many that really can help without the need for prn medication, or in addition to it. Ultimately, learning and mastering these skills is what we need to do.