Truvada can also cause a long list of side effects, including gastrointestinal problems. And it's costly, with prices in the United States tagged at about $26 a day or $10,000 a year. Still, a study released this year found the drug would be cost-effective if used extensively by gay and bisexual men at high risk of becoming infected.
For his part, Paltiel said his research came to the same conclusion: That widespread usage of the drug in high-risk people would be "as cost-effective as other widely accepted public health and medical interventions."
Find out more about HIV/AIDS at the U.S. National Library of Medicine.
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