Antibiotics After Sex: What Works and What Does Not

What should I do?

Pick your situation

Tap what happened and see what fits. A guide, not a diagnosis.

DoxyPEP fits

Take doxyPEP within 72 hours

Two tablets of 100 mg together, ideally within 24 hours. It strongly lowers the risk of syphilis and chlamydia, and partly gonorrhoea. Test again in two weeks and every three months.

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You need HIV PEP, not antibiotics

Antibiotics do not work against HIV. HIV PEP is a 28-day course that has to start within 72 hours, ideally within hours. Go to a sexual health clinic or emergency department today. If you use PrEP correctly, you are already protected.

Get tested

Test and treat, do not prevent

Discharge, a sore, a rash or pain when peeing can mean you already have an STI. DoxyPEP is not a treatment. Get tested so a doctor can give the right medicine at the right dose.

See a doctor

Could be a bladder infection

Burning when peeing shortly after sex is often a bladder infection, especially in women. A doctor can check your urine. Women with recurring bladder infections after sex can get a specific antibiotic for that, which is different from doxyPEP.

Not an antibiotic

You need emergency contraception

The morning-after pill prevents pregnancy, antibiotics do not. It works best as soon as possible after sex and is available at pharmacies in most European countries.

The only proven option: doxyPEP

Bedroom in soft morning light with a made bed

Doxycycline post-exposure prophylaxis, doxyPEP, is the only antibiotic approach after sex that large studies have shown to work.

One dose of 200 mg, taken within 72 hours after sex without a condom, lowers the risk of syphilis and chlamydia by more than three quarters and gonorrhoea by about half. Read more in what is doxyPEP.

What does not work

Option	Works to prevent STIs?	Why
DoxyPEP (doxycycline 200 mg)	Yes	Proven in large studies
Leftover antibiotics at home	No	Wrong type or dose, raises resistance
Amoxicillin after sex	No	Not shown to prevent STIs
Antibiotics against HIV	No	HIV is a virus, antibiotics do not work
Daily doxycycline before sex	Not advised	Only studied on a small scale

Why "just any antibiotic" is a bad idea

Taking the wrong antibiotic, or the wrong dose, does not protect you but does give bacteria a chance to become resistant. That makes future infections harder to treat, for you and for others. DoxyPEP is a specific dose of a specific medicine, used only after a real risk.

Antibiotics do not replace testing

Whatever you take, test for STIs every three months if you have sex without condoms, and always when you have symptoms. Testing finds what prevention misses.

Frequently asked questions

Can you take antibiotics after sex to prevent an STI?

Yes, but only one approach is proven: doxyPEP, a single 200 mg dose of doxycycline within 72 hours after sex. It lowers the risk of syphilis and chlamydia, and partly gonorrhoea.

Can I use leftover antibiotics after sex?

No. Other antibiotics, such as amoxicillin, have not been shown to prevent STIs, and the wrong dose can help bacteria become resistant.

Do antibiotics after sex protect against HIV?

No. Antibiotics do not work against viruses. After a possible HIV exposure you need HIV PEP, started within 72 hours at a clinic or emergency department.

What about a bladder infection after sex?

Some women get recurring bladder infections after sex. A doctor can prescribe a specific antibiotic for that. It is a different medicine and a different reason than doxyPEP.

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Antibiotics after sex: what works and what does not