"i had abdominal surgery and after post op i was back in my room on a dilaudid iv pump.  the pain management was great but had a bad side effect.  it caused mt to have hallucinations.   i don&#039;t know if it was to high of a dose are not,  but i was seeing weird people in my room, under my bed, i saw monsters, snakes and they all were trying to get me. i was screaming and asking for help. i had to have my wife stay with me cause i could not close my eyes to sleep.  i literally felt like i was in a freddie kruger movie.  i now list this as a drug allergy when asked if i&#039;m allergic to any medications.  i never want to experience that again"