Pre-Exposure Prophylaxis

What is PrEP?

PrEP (Pre-Exposure Prophylaxis) is a tablet that you can take to reliably prevent HIV.

Lots of people, especially gay and bisexual men, take PrEP to prevent HIV.  PrEP works similarly to HIV treatment medication by stopping the virus from making copies of itself. If you’re on PrEP, the virus can’t set up in your body, so you will stay negative even if you have sex without a condom.

The medication can be taken every day to provide constant protection from HIV. If you don’t need regular protection from HIV, you can also choose to take PrEP on demand before and after sex to give you the same level of protection.

Does PrEP work?

Does PrEP work?

Absolutely. PrEP has been proven effective against HIV in many large scientific studies. It only protects against HIV, not other STIs, so you will still need to be tested regularly to see if you need to take treatment to cure other infections like syphilis or chlamydia.

PrEP can have some side effects occasionally. You might have headaches or a stomach upset for a few days while your body gets used to it. Your doctor can advise you about how to manage this if it happens, or if you notice any other symptoms after starting.


A medication, if started within 72 hours, may prevent HIV after a potential exposure to the virus through sex (or injecting).

Treatment As Prevention

TasP refers to using HIV medication to dramatically reduce the chance of transmitting HIV to others.

How Is HIV Transmitted

HIV can be shared in some body fluids, like blood and semen, but not in fluids like saliva or sweat.

HIV Prevention

As well as condom use, over the last decade, HIV treatment has come a long way and now plays a vital role in prevention.

icon-angle icon-bars icon-times