A member asked:

I took plan b after sex and then monday night started on clindamyclin for tonsillitis. i take it 3x/day 300mg. will effect plan b effectiveness?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Note likely.: Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), Rifampin, tetracycline, & clarithromycin.

Answered 9/10/2017

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