"started taking celexa on august 14th. within 2 days i broke out in hives on my collar bone then within a week i had severe hives on my arms and spreading. within a couple of days i had hives on my legs and back. dr. didn&#039;t think it was the celexa so continued it and ended up in the emergency room with worse side effects vomiting!  emergency room declared i had a severe allergic reaction to celexa. "