Q:

Can antibiotics make your period late?

A:

Antibiotics do not make a period late. Things such as stress and illness do affect ovulation, which in turn effects periods, according to the American Pregnancy Association.

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Ovulation for most women occurs approximately 12 to 16 days prior to a period, according to the American Pregnancy Association. This means that whether a period is late or early is already determined 12 to 16 days prior to the period, with the occurrence of ovulation.

Antibiotics as a whole don't modify ovulation. Rifampin is the only antibiotic known to directly affect the effectiveness of contraceptives such as birth control pills, according to Mayo Clinic.

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