A 28-year-old female asked:
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can doxycycline hyclate 100g and/or spironolactone 100g decrease the effectiveness of birth control pill (junel fe 1.5/30)? i take bc daily but had sex without condom (did not finish inside). how much less effective is the pill? should i get plan b?

1 doctor answer
Dr. Robert Kwok
32 years experience Pediatrics
About antibiotics...: The current thinking is that except for rifampin, other commonly-used antibiotics (such as doxycycline and many others) do not alter the effectiveness of birth control pills. This is likely presuming a person is not sick with vomiting or rapid diarrhea, or some other condition that decreases the absorption of a swallowed pill. One can look up: http://www.ncbi.nlm.nih.gov/pubmed/12063491
Answered on Jun 9, 2020

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Dr. Cody Mead
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Safe > Sorry: While no evidence shows that any antibiotic except rifampin alters the effectiveness of oral contraceptives, the package inserts will likely say that ... Read More
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A 17-year-old female asked:
Dr. Gurmukh Singh
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Get Plan B ASAP: It would be preferable to take Plan B as soon as possible. You may not be able to get the dose of bc pills right. If you do not wish to be pregnant, u ... Read More
A 31-year-old female asked:
Dr. Steven Charlap
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Yes: Antibiotics are known to do so.
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