I have a sore throat the morning after molar extraction, is this normal? i'm currently taking penicilln 500mg tab qid.

It is possible: If there was an infection. The lymph node may be swollen and may make your throat feel sore. If this does not improve in 24 to 48 hours with the pencillin. Call the dentist who did the extraction. You may need different antibiotic. If swelling increases call the dentist sooner.

Probably: Molar extractions are stressful for patients. Soft tissues ae often manipulated to remove this tooth. All this can tax the immune systems and bring out an underlying viral infections. If swallowing or breathing difficulties occur seek immediate medical attention and let your dds know too.

Not out of ordinary: During lower (especially wisdom tooth) extractions, the surgery itself traumatized the surrounding tissues, which can sometimes manifest itself as a sore throat. If you had an infection, that may be contributing, too.