I've done it... the side effects are horrible, cottonmouth, sleeplessness, complete uncomfort. i took about 300mg's in pills plus half a bottle of liquid benadryl, and shadows were completely moving around in a wavy way...

Also i tried falling asleep and thought i was, but i was really staring at my bedroom wall in my bed, having full in-depth conversations w/ people who werent there but i thought were, and i'd sit up after i was done talking and find nobody. It was extremely odd and caused me to kinda panic.