If you do not start on Sundays, throw out the rest of the pill pack. Start the next pack that day. Also use a back-up birth control method the next 7 days. Keep taking 1 pill each day until the pack is empty. You do not need a back-up method.
Much controversy exists on whether antibiotics inactivate oral contraceptives.
New research indicates the risk is very low to nonexistent unless the antibiotic is rifampin or griseofulvin. However, you may want to consider a back-up method for the duration of the antibiotic plus 7 days, especially if abdominal cramps, vomiting or diarrhea develop while on the antibiotic. If you are just starting birth control pills, remember to return to the clinic without an appointment for a blood pressure check. A prescription refill will be given at that time if appropriate. 2001 Rethinkinc , all rights reserved 98six and its contents provide information only.