I was switched to the generic Lexapro (escitalopram) at the end of March. I noticed about the end of April that my left pupil would sometimes be slightly larger than my right. This obviously threw me into complete panic mode so I went to my optometrist. He couldn't notice it, but sent me to a neuro-opthomologist just for piece of mind. He also couldn't notice it. It happens mainly at night... and I take my medication at night. I recently switched back to the Lexapro about a week ago as my anxiety symptoms came back full force. I'm concerned about these uneven pupils..