Bupropion
"My doctor started me on a very low dose of this (100mg). I have anxiety, depression, and (a questionable diagnosis, pending review) of bipolar disorder. The first day I took this I had a full blown panic attack. My heart was racing so fast and I was experiencing pretty bad chest pain and heaviness, so much so that I called the office and they wanted me to stop taking it and go to the ER to have an EKG done. I stopped taking it for about 2 weeks, but wasn't ready to give up on it - big mistake. So I went back on it for 3 days. Each day I had elevated heart rate, and felt anxious all day long. I was EXTREMELY irritable to the point of rage, my ENTIRE face broke out with painful cystic acne I'd never had before - basically over night. Skip!"