sharriann,
Yes- antibiotics can lessen the effectiveness of birth control pills whether it be for contraception or regulation. Antibiotics that have been shown to interact with contraceptives include
Rifampin (brand name Rifadin), Penicillin (Veetids), Amoxicillin (Amoxil or
Augmentin), Ampicillin (Omnipen), Cotrimoxazole (Septra or Bactrim),
Tetracycline (Sumycin), Minocycline (Minocin and Doxycycline), Metronidazole
(Flagyl), and Nitrofurantoin (Macrobid or Macrodantin). If you have this concern please talk with your doctor.
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