By reputation, Prozac and Lexapro have the least side effects. That doesn't mean much for you, though, as has already been stated, and it doesn't mean they'll work, either. Often, the better a med works, that means it's been metabolized better, and thus, alas, the more side effects. Clonazepam, by the way, is for long term use, not necessarily short term. Xanax or Ativan would be more likely to be given for short term use.