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Efficacy of birth control pills while on antibiotics - Online Doctor Chats

Date : 21-Feb-2012
User rating for this question
Very Good Posted in: Birth Control
Answered by

General & Family Physician
Practicing since : 2009
Answered : 593 Questions
User :   hello
User :   hello
Doctor :   hi
User :   i have a few questions
Doctor :   sure
Doctor :   please proceed
User :   ok so my girl friend has been on birth control for a couple of years now
User :   she took antibiotics from may 28th-june 6th
Doctor :   ok
Doctor :   ok
User :   she got her period on june 7th and it lasted until the 10th
Doctor :   ok
User :   we had unprotected sex on june 15th and the 17th but i did not ejaculate in her
Doctor :   ok
User :   after we forgot all about the antibiotics
User :   she looked up her antibiotics on WWW.WWWW.WW and it was not on the list of antibiotics that affect birth control
User :   should we be worried at all?
User :   because im freaking myself out over this
Doctor :   ok
User :   and i don't know what to think
Doctor :   what antibiotic did she take?
User :   something with an L let me ask her
Doctor :   ok
User :   i mean we did wait 8 days after but im still worried
Doctor :   what birth control pills is she using??
User :   i just texted her she should respond soon
Doctor :   ok
User :   she was taking yaz but switched
User :   a while ago
User :   i know they were antibiotics for a mouth infection
Doctor :   when did she change?
User :   couple months ago
User :   im trying to call shes not responding
User :   do you have any general thoughts
User :   levaquin is the antibiotics
Doctor :   but it would be better if i know the tab name
Doctor :   ok
User :   loestrin24
User :   fe
User :   is the birth control
Doctor :   fe is the birth control pill she is using now not yaz??
User :   correct
User :   fe
User :   she is using fe now
Doctor :   ok
Doctor :   give me 2 minutes time
User :   k thanks a lot
User :   i appreciate it
User :   hello?
Doctor :   yes
Doctor :   please give me some time
Doctor :   i will explain u in detail
User :   how much time is left
User :   if it runs up can you please email me your YYYY@YYYY
Doctor :   sure
Doctor :   antibiotics defenetly reduce the effectiveness of pills
Doctor :   but as u had sex after almost 10 days after taking antibiotic ,
User :   ok
Doctor :   the chances are very unlikely
Doctor :   t is also noteworthy that birth control pills are not 100 percent effective anyway.
User :   does it help that it was 5 days after she finished her period?
User :   she wasnt in the middle where she is most fertile
Doctor :   yes
Doctor :   u are right morover as it is not fertile period ..
Doctor :   and it is safe period ,u dont have to worry much
User :   what do you mean safe period
User :   ?
Doctor :   she would ovulate on the 14th day, so she should avoid having sex on day 9 to day 17. The rest of the cycle should be relatively safe.
Doctor :   or u can take it as Safe time is one week before and one week after period starts.
User :   why does WWW.WWWW.WW say that levaquin doesn't affect birth control pills tho?
Doctor :   because there are few antibiotics like rifampacin /tetracyclins
Doctor :   which effect the levels of harmones in the pills taken
Doctor :   but there are no such effects by levaquin..
User :   so all things consider there is always a tiny possibility but we should be fine and have nothing to worry about?
Doctor :   till date,but we cannot entirely rule out
Doctor :   no contraceptive is 100 % safe
User :   true
User :   should we use a condom until her next period
Doctor :   so no one can assure u 100% safety..but according to ur history
Doctor :   u are more likely to be on safer side
User :   how long do antibiotics stay in a persons body?
Doctor :   it depends upon the antibiotic
Doctor :   again
User :   how long would levaquin stay in my gfs body
User :   if she stopped taking it the 6th of june
Doctor :   not more than 24 hours
User :   ok good
User :   so were probably safe but you never know
Doctor :   yes
Doctor :   u are right
User :   thank you very much
User :   you calmed my down a lot
Doctor :   welcome
User :   me]
Doctor :   is there anything i need to help u with?
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