What antibiotics can be bought over the counter for an infected tooth
You cannot buy over the counter oral antibiotics. They are by prescription only.
Penicillin, clindamycin and also amoxicillin are the three most commonly prescribed antibiotics to help control dental infections. You should first consult with a dentist and you can find out more details here http://www.livestrong.com/article/162065-medicines-for-an-infected-tooth/.