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A member asked:
Is doxycycline as effective as penicillin with syphilis i am allergic to pen.also how long does it take for the doxy to work am infectious while on it?
A doctor has provided 1 answer
Just as effective: Yes, doxycycline is just as effective as penicillin, but you must take all of the pills more or less on time. You're probably non-infectious after a few days, but best to avoid sex until after completing the entire 2 weeks of treatment.
Answered 8/23/2017
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