Which antibiotic can we take for abcess tooth?

I go see the doctor tomorrow about my stomach ache, but then on Thursday I go about my tooth that is killing me.. Actually its the roof of my mouth and gums.  I know before they do anything I am going to have to go on a Antibiotic... Is there really any that we can't have?   I have be on a Zpac and Cithro?  since my surgery.  

There are no antibiotics you can't have because of your RNY.  Of course, if you have any allergies, then don't take that.