In treating depression and anxiety. If Lexapro side effects like stomach pain, vision changes, uncontrolled movements, contact your doctor immediately. The fastest growing anti-depressant on the prescription drug market today, thanks in large part to its relatively benign side-effect profile. There have been some complaints about it, like its alleged contributions to weight gain and its high price. There was no difference in response to Lexapro between men and women. Lexapro blocks the re-absorption of serotonin by the first nerve cell.