Panic Disorde
"I have post traumatic stress disorder and PCs.  My psychiatrist switched me from Ativan to clonazepam a few weeks ago. It is powerful and effective. I am prescribed 0.5mg 3X daily (and 200mg of sertraline). It lasts a LONG time and can take up to 4 hours to peak, so if you take 0.5mg, wait a half hour, (decide its not working) and take another half.  I now take a quarter of a pill (0.25mg) at a time and give it at LEAST 2 hours to kick in (because I like being able to leave the house once in a while)."