Chlamydia rarely infects the mouth and throat and there has never been a proved case of chlamydia that was acquired by fellatio. The risk of gonorrhea is higher, but still uncommon compared to vaginal sex. I don't recommend self-treatment with leftover antibiotic. But levofloxacin (Levaquin) is active against both gonorrhea and chlamydia.
The doc has said there is no documented evidence that you can get chlamydia from receiving oral. There is a small, very small chance of gonnorrea. But if you had gonnorrea, you would have symptoms within a few days of exposure. Why not hang on and see if you have it (again, slim chance) and if you get a drip, then you will have a better idea of what to do. You should never take left over antibiotics. If you get symptoms go to a doc. If not, then forget about it.
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