The doxycycline doesn't matter. The standard ceftriazone (Rocephin) dose always prevents syphilis when given soon after exposure. You are 100% protected against gonorrhea, syphilis, and chlamydia. (Not that you needed such treatment after a single oral sex exposure!) That's my last comment to your third (?) question about this event. No more, please.
Answered 10/4/2022
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This is prophylactic- or 'just in case, and should be OK
Answered 10/5/2022
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