I took antibiotics for a week...how long should I use a back up method of birth control as I'm on the pill.
Until your next period. After that you are ok.
Source(s):
I'm a nurse. Used to work in family planning. There is no reliable study that proves that antibiotics affect pregnancy prevention by birth control pills, however if you are worried about getting pregnant there is never anything wrong with using more than one method of birth control at the same time, it is just not likely to be necessary. Remember than condom use will prevent std's and can be used in addition to the birth control pills.
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