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A member asked:
Can plan b lose effectiveness if i finished an antibiotic 3 days ago? still on birth control pill
2 doctors weighed in across 2 answers
No: In general you do not need to take Plan B if you were already on birth control. Most antibiotics will not interact with either Plan B or birth control. If you are uncertain in the future you can always ask the pharmacist or just use a condoms during those days.
Answered 9/28/2016
3.6k views
Plan B does not: interact with many antibiotics. Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), Rifampin, tetracycline, & clarithromycin.
Answered 9/9/2017
554 views
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