I came across a situation that after some research I'm still not sure on how to deal with it. Around 8am Sunday morning I had an encounter with a CSW massage woman (I would say over 30y old but not sure) that consisted in unprotected oral (both) and vaginal protected sex and the vaginal sex happened twice. During the second time we re-used the same condom (which I know isn't a smart thing to do) and that's why I became concerned. There's not a strong reason to believe that the condom didn't work the second time but I'm also not sure as this is a new situation for me. I also noticed some skin lesions/maybe just different skin color around her vagina which scares me now. It didn't look like open sores or anything like that. I have had HPV in the past so pretty sure my partner already has it even if never had symptoms. Herpes has never been present in both of us but that doesn't worry me as we could carry it for years and years without knowing and isn't that harmful anyway (same for HPV) - correct me if I'm wrong). From what I read on this forum HIV isn't a problem as well. 

As I have a regular partner I started freaking out. Unfortunately am not able to visit a specialist at this time and decided to do some research on the internet. I then decided to auto medicate myself with 800g of cefixime (tablets) and 1g of zithromax. I took the medication in one go on an empty stomach pretty much 24h after (maybe a bit less or a bit more) the event. So here are my questions:

1- Do I have any reason to be worried regarding STDs at this moment?

2- If not and after having taken the medication mentioned, when would it be safe to resume unprotected sex with my regular partner without risking transmitting anything (reasonably) to her?

Thank you for your time. 

Regarding the specifics of your encounter let me add that most commercial sex workers do not have HIV or other STI’s and, on average, when a sex partner has an STI, most exposures do not result in transmission of infection   Finally, the medications that you took would prevent any risk for gonorrhea chlamydia or syphilis.

At this point I would categorize the event you describe as low risk and would not worry. At this time there is little value in testing for STI’s either. I hope these comments are helpful to you. If there are further questions you have up to two follow-up questions to seek clarification. Take care. EWH

Like you, I would presume that the drug you took was cefixime.  EWH

As you note this will be my final response as part of this thread. I hope my comments have been helpful to you. Please don’t worry. EWH