can antibiotics bring on a mania attack in a young man who was never sick but now they say he has bipolar,i think it was the ant

Trauma of any kind can trigger bipolar disorder, including illness or life events.  I have heard of steroids bringing out mania before, but not antibiotics - but that doesn't mean it hasn't happened.  Often bipolar disorder will manifest itself at a "young man" age - late teens, early twenties.  My advice for you is to get more than one opinion before accepting this diagnosis.

thank you i will.