A recent study found that people who regularly took the brand name drug Truvada for pre-exposure prophylaxis, or PrEP, therapy were nearly all protected from being exposed to HIV.
The news comes as Charlie Sheen announced Tuesday morning on the Today Show that he is HIV-positive.
Time reported the Journal of the American Medical Association study found two of 500 individuals deemed high-risk who took the drug regularly became infected over the duration of the yearlong study. The two people who did test positive for HIV after the year were found to have low levels of the drug in their bodies compared with their counterparts.
Out of the original over 500 people who took part in the study, 437 stuck with it for the full 12 months. Many of the individuals who took part in the research identified as gay or bisexual and were men or transgender women.
Truvada, the drug, is comprised of emtricitabine and tenofovir. Researchers found that those who had unprotected sex and caught other STDs were still protected from the virus while on the drug.
“These results are promising, and really highlight the potential role of PrEP as a prevention tool for men who have sex with men,” said Dr. Albert Liu, clinical research director of Bridge HIV in the San Francisco Department of Public Health and the study’s lead author, to Time.
But while it’s effective against preventing exposure to HIV, being on PrEP does not prevent the spread of other sexually transmitted diseases. However, the study found that the rate of catching an STD did not increase, showing that people were no more reckless while on Truvada.
There’s no vaccine against HIV today, but researchers said that the pill could help curb the virus from spreading further. There are currently 1.2 million people in the United States living with HIV and 36.9 million people with it globally.
Those in the study were given Truvada for free, although not all insurance companies cover it. The drug can cost as much as $8,000 to $14,000 per year, according to the Time.
Also in the news, an alcoholism drug, branded as Antabuse but also sold as a generic called disulfiram, has been found to potentially help kill HIV, according to a study released by University of Melbourne researchers in Australia.