The Food and Drug Administration approved the preventative use of lenacapavir, made by Gilead Sciences, on Wednesday. Experts say lenacapavir is easier to administer, and each dose lasts longer compared to other medications.

A drug currently used to treat certain HIV infections has also, on Wednesday, received approval from the US Food and Drug Administration to be used to prevent HIV.

Clinical trials have shown that six-monthly injections of lenacapavir are almost 100 percent protective against becoming infected with HIV. But big questions remain over the drug’s affordability.