Yes. It's supposed to serve as a depressant for things like paranoia in psychological circles, but as BP mentioned, it's not all that it's cracked up to be. In those cases it's probably best to find a separate motivator.
On one hand, it caused me to think that walking along the edge of a decaying wooden bridge was a good idea. On the other hand, I've always eventually calmed myself in terrifying situations with it which helps me deal with certain issues.
