I was prescribed ativan (lorazepam) for acute anxiety and panic attacks. I would take 1 - 1mg sub-lingual tablet before boarding trains, buses and airplanes. I found that it was very potent and when used as a prophylactic it eradicated my anxiety and panic attacks.
I did find that it made me jittery and it caused dizziness and vertigo. In larger doses, ativan will cause what is known as retrograde amnesia. I found that aspect of the drug particularly frustrating.
I have found that xanax (alprozolam) is a better alternative to ativan due to it's shorter half life. It too is a highly potent benzo, but it won't linger in the system for hours on end. Be forewarned, that short half life also makes xanax even more addictive and the potential for abuse much greater.
Regards,
miss digby