One pill a day may help you keep HIV away.
Doctors are recommending that patients at high risk for HIV take the drug Truvada.
It is currently used to treat HIV, and is 90 percent effective in reducing new infections.
Doctors say it could be life-saving for people with an HIV positive partner.
Experts say users should have an HIV test before beginning this treatment, to be sure they are not already infected.
Currently around 50,000 people each year are diagnosed with HIV.