I have had loads of side effects, I would consider myself border-line addicted though...
I ingest anywhere from 20mg-70mg
My common SE's include:
Tingling in extremeties
Immobility of hands/fingers
Pain in my left shoulder-blade
Heart palpitations (scary!)
Headaches
Extreme agitation
Difficulty breathing
Could prob name more... lol
anyways, yeah, its got a lot of side effects, but I've never asked a Dr about any of them and I'm still alive