Plan B: Plan B works through delaying or preventing ovulation, by interfering with fertilization. The FDA package insert also states that Plan B may inhibit implementation by altering the lining of the uterus. I do not know of any specific interactions which have been reported with concurrent antibiotic use.
Answered 9/12/2017
2.8k views
Most antibiotics: are ok. Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), Rifampin, tetracycline, & clarithromycin.
Answered 11/4/2017
554 views
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