It depends: It depends of the other medicines you are taking. If you have a concern, call your doctor's office and ask.
Answered 2/1/2013
5.3k views
Normally: But my understaind is that ampicillin, cotrimoxazole (in Bactrim), tetracycline, & clarithromycin may impact effectiveness of Plan B One Step.
Answered 9/8/2017
556 views
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