I have been putting off switching from Fluoxetine 20mg to Lexapro 5mg out of fear of side effects. I am afraid that the increased anxiety that may occur as a side effect will not be relieved by taking a benzo as prescribed. I am changing meds because the Fluoxetine has quit working and I have developed GAD. My biggest fear in life is PANIC ATTACKS, it controls so much of my life! If I knew the Klonopin will help if I am experiencing anxiety and panic as side-effect, I would feel a lot better switching meds.