I have an infected tooth that needs root canal but i was put on antibiotics first. been on them since thur. evening i have no appetite today nauseous& can taste the sourness. should the tooth be drained or should i finish the antibiotics before then?

Continue with the antibiotics and see your dentist to start the root canal therapy at your scheduled appointment.

Antibiotics will not cure an infected tooth, but will limit spread of infection and increase success of additional treatment. Advanced infection usually presages root canal treatment/crown or extraction/implant/crown. Antibiotics alter the bacterial balance in your GI system. Call your prescribing Dentist, report your discomfort, and ask, "what's next?"