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Amoxicillin side effects on birth control pills.

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hi, i was wondering about some medications and it's affects on the birth control pill. I recently got infected wisdom teeth and i was prescribed amoxicillin trihydrate for the infection. I had sex about a week ago and i was just finishing up on the medication, i am on the birth control pill and i really need to know if the medication will lower the effectiveness of the birth control, and if there is a chance of pregnancy?

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Category: Family Physician-GP
 23 Doctors Online

Hello, Thank you for asking your query at DoctorSpring

Amoxicillin can make birth control pills less effective. You should have notified the dentist that you are on birth control pills. The dentist would have gone for alternative drugs like clindamycin. However, I advise you to use a backup method of birth control like using condoms while taking amoxicillin to prevent an unwanted pregnancy.

As you say you have had sex a week back when you were on amoxicillin, I suggest you go for a urine pregnancy test after a week to be on safer side.

Hope this helps.Please feel free to ask follow-up questions


Dr. John Monheit
Category: Family Physician-GP
Experience: 
Residecny: North Colorado Family Medicine
Medical School: The Chicago Medical Center
Dr. John Monheit and 4 other Medical Specialists are ready to help you

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