Today one of my patients asked a question about her medication, an SSRI, and my answers might be useful to others taking similar medication.  She was taking fluoxetine, brand name Prozac, for a number of months.  Even at a relatively high dose of fluoxetine, she continued to experience significant anxiety.  Fluoxetine is ‘activating’ in some people, meaning that it sometimes increases the person’s sense of energy, which can, in turn, increase anxiety.  At some point we decided to change to escitalopram, brand name Lexapro, a newer SSRI that has a high potency and somewhat less activation.