Probably not: Flucloxacillin or floxacillin does not appear to interact with birth control pills, http://www.medsafe.govt.nz/consumers/cmi/f/flucloxacillin-aft.pdf But anytime you are sick or taking several meds, or vomiting it might be wise to use condoms for a couple of weeks.
Answered 12/1/2016
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