Science magazine names twice-yearly lenacapavir PrEP its 2024 Breakthrough of the Year, recognizing its potential to significantly reduce HIV acquisition risk. Lenacapavir, an HIV capsid inhibitor, is administered every six months and shows promise for broader viral disease applications. Gilead is developing longer-acting formulations, including a potential once-a-year injectable version. The breakthrough underscores ongoing efforts to combat HIV/AIDS, with lenacapavir offering a new, effective prevention option.