INEQUALITY IS EVERYWHERE: Women Need Much Higher Doses of Truvada Than Men. “A recent study has found that Truvada, the only drug approved for the prevention of HIV infection, reacts differently in the male and female body and, as such, actually has different dosing requirements for men and women. The pharmacy researchers from the University of North Carolina at Chapel Hill discovered that while women need to take daily doses of Truvada to prevent HIV infection, men only need to take two doses per week.”