A member asked:

I took plan b 3days ago,i have a cold and my doctor gave me amoxicillin. will it effect the plan b?

3 doctors weighed in across 2 answers
Dr. John Chiu answered

Doubtful: The impact of antibiotic on contraceptive has always been controversial and I can think of no reason why it would affect Plan B. I do not think Amoxicillin or any antibiotic should be used for an uncomplicated cold since antibiotic does not affect virus and does have potential side effects.

Answered 9/29/2016

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Dr. Heidi Fowler answered

Specializes in Psychiatry

Possibly: Because ampicillin can affect Plan B - It stands to reason that amoxicillin likely could as well. Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), Rifampin, tetracycline, & clarithromycin

Answered 9/10/2017

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