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Medication to prevent STI/HIV after protected sex.

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Hello.  Last night I had a one night stand with a girl I met in Siem Reap.  The encounter was short, and I wore a condom the entire time.  I later filled it with water to ensure it didn't leak - it didn't.

Still, I'm afraid of possible STI exposure, including HIV.  I'm mostly concerned about this due to the high incidence rate here.  I'm not sure what to do next, or if I should be taking some medication to prevent possible infection.

Category: Family Physician-GP

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Category: HIV- AIDS Specialist
 22 Doctors Online

Thank you for your query at
I understand your concern.
The good thing is since you wore a condom, no further intervention is required. Studies say if a condom is used properly, it can prevent STIs almost 100 % of the times. HIV can be spread only through unprotected interocurse, perinatal transmission, through contaminated blood and blood products, or through infected needles.
So right now you do not need any intervention.
Feel free to discuss further,

Patient replied :


Thank you for your answer. It definitely makes me feel better. I do have a few other concerns. I've read online that condoms can fail, or that HIV may get through the latex. Do you think I should be concerned about that? Does filling it with water demonstrate that it didn't fail? Also, how soon can I be tested and know for sure that I'm negative?
Also, I did insert my finger into her anus very briely. Is there any concern with that in terms of contracting a disease? I don't believe I had any cuts on my fingers, and she didn't seem to have any fluids.
Lastly, should I be concerned due to the high incidence rate here? That's mostly what has me freaking out.



Hello Eric,
I am happy that i have been able to relieve you of your anxiety.
The high incidence rate only shows that most people there have unprotected intercourse, which can again indicate social causes such as backwardness, and lack of education or awareness among the public there.
You did the right thing by wearing condom, so do not worry.
Regarding inserting finger in her anus, again no disease can be trasnmitted by that. Until and unless you have anal sex.
As i said earlier, if condom is used properly, then it prevent STIs 100 %. Only when people do not use it properly, or there is a tear, then there is a cause to worry. And this gives a failure rate to condoms. This is not because of the condoms or lates, rather it is the inability of the user to use it properly.
So please do not worry.
To have a very conclusive evidence, i will advise you to get yourself tested ( if at all you want ), at the end of 3 months with a 4th generation HIV test.
Hope this was helpful,

Patient replied :


Thanks again. Just wanted to see what you meant in this line:

"This is not because of the condoms or lates, rather it is the inability of the user to use it properly. "
Also, do you think that filling the condom with water, and not having any leaks, demonstrates that there was no leak? Also, if the girl didn't excrete any fluids, and the intercourse only lasted a short while, will that reduce the risk?
Thanks again. Sorry for all the questions - I'm paranoid.

Hello Eric,
I meant to say there are no issues with condoms or latex. Sometimes the person using it doesn't know how to use it or puts it on in a wrong way. Only in this cases, transmission can occur and this is what leads to the the failure rate.
Yes if you filled water and there was no leak anywhere, then it did not have tears.
Also the chances of getting HIV from an infected girl is much lesser since they really don't have any active discharge that has good volume unlike an ejaculate from a man.
So in your case there is nothing to worry about.
But the duration of intercourse has no bearing in passing HIV.
Hope this was helpful,

Patient replied :


thanks again. Do you think it's worthwhile for me to visit a clinic to get tested now? Maybe I should take retrovirals to be safe?


Hello Eric,
No there is no point getting tested.
Also anti retrovirals should be taken only when the exposure is bad, such as getting pricked by an infected needle, unprotected intercourse with HIV positive patient, e.t.c Also they do have a lot of side effects, so you do not need to take them because there is no need.
I assure you, you do not need to anything further.
Kindly relax.

Dr. Jaydeep Tripathy
Category: HIV- AIDS Specialist
MBBS from Sri Ramachandra University in December 2011
M.Med (Family Medicine) - TNMGR University, Chennai
MBA-MPH in Public Health in March 2016, SRM University
Finished AFIH in March 2016, SRM University
MRCP ( UK ), Internal Medicine, Royal College of Physicians, June 2016
Fellowship in Diabetology from Martin Luther University in January 2017

Currently Resident Physician, in MD Radiodiagnosis - Kamakshi Memorial Hospital, Chennai
Dr. Jaydeep Tripathy and 4 other Medical Specialists are ready to help you

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