Pain
"My cat was given Buprenex oral after surgery.  I&#039;m assuming it worked on his pain but now that he&#039;s off of it he&#039;s &quot;seeing ghosts in the house&quot; and slinking around in fear.  Hallucinations are one of the side effects.  Just letting other pet parents know what can happen.  I&#039;m sure it will wear off but for now it&#039;s just upsetting to watch."