(CNN) In a breakthrough in the fight against HIV infections, the Food and Drug Administration has approved a pill that can reduce a person's risk of contracting the virus.
Truvada, made by Gilead Sciences, is already being prescribed by some of the country's physicians who say they know the medication is working.
"I know for a fact that I am preventing HIV infections in high-risk individuals by putting them on Truvada," said Dr. Shawn Hassler, San Francisco physician.
For the first time in the 30-year history of fighting AIDS, the FDA approved a medication for use by healthy, HIV negative people who engage in risky sexual behavior or who have a partner who is HIV-infected.
"It's a watershed moment in the fight against HIV," said Hassler. "Today heralds a new era in HIV prevention."
Even with the drug's approval, health officials still urge people to use condoms, but with more than 50,000 people in the United States becoming infected with HIV each year, they're hoping Truvada will help stop the spread of the disease.
Health officials are hoping insurance will cover Truvada, which costs about $1,000 a month.