Is it possible that an antibiotic medication used for a root canal can interfere with birth control pills?

Absolutely: Many antibiotics will decrease the efficacy of the birth control pills. Alternate means of contraception should be used to avoid pregnancy. Discuss with your prescribing dentist.

Biggest medical myth: The only antibiotic that has ever been shown to interfere with birth control levels and effectiveness is a medicine called Rifampin which is used to treat tuberculosis. Do not pay attention to the biggest medical myths of all time. Take care.