A 21-year-old female asked:
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i'm currently taking doryx (doxycycline) and also took plan b. will doryx (doxycycline) interfere with plan b and cause me to get pregnant? did not use condom; first time.

2 doctor answers
Dr. Felicia Donald
38 years experience Obstetrics and Gynecology
No: Taking Doryx (doxycycline) should not interfere with Plan B.
Answered on Sep 8, 2017
Dr. Heidi Fowler
24 years experience Psychiatry
Plan B & Doryx: The Drugs.Com drug interaction checker showed no significant interactions between doxycycline & Plan B One-Step (levonorgestrel).
Answered on Nov 27, 2017

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Dr. Wayne Ingram
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Unlikely: Unlikely but possible. Do a pregnancy test if the end of the cycle shows no period before you start your next pack of pills.
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Dr. James Ferguson
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No: They are usually avoided in pregnancy but not a problem for the fetus in the first 12-18 wks.

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