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...doxycycline), although many physicians still recommend the use of barrier contraception for people taking the drug to prevent unwanted pregnancy.<ref name="pmid120

...d rifampicin can also in similar fashion reduce the efficacy of [[hormonal contraception]], to the extent the unintended pregnancies have been reported among users

...ir]], as well as [[clarithromycin]], [[ketoconazole]], forms of [[hormonal contraception]], and [[methadone]].<ref name=PInfo/>