Are you a guy?: Flagyl is a brand name for metronidazole, so you are (or she is) taking a single antibiotic. Theoretically, metronidazole & other antibiotics can reduce the effectiveness of oral contraceptive, altho the chance from this specific antibiotic is very small. If your (or her) period is late, I recommend a pregnancy test. Best wishes.
Answered 10/3/2017
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