Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Anxiety

PLEASE be careful with this if you are prone with anxiety. I took this and within an hour I felt completely manic. I could feel the adrenaline surging through my veins and my heart was going crazy. My mouth felt like it was full of cotton- unlike anything I've experienced before. It is the morning after and I feel still very hyped up. I don't doubt this could be beneficial to some, but please use caution if you are anxiety prone or are already suffering from anxiety.