Emtricitabin og tenofovir virker begge ved at blokere revers transkriptase, et enzym, der produceres af hiv og gør det muligt for viruset at smitte celler og producere flere virus.
Both emtricitabine and tenofovir work in similar ways by blocking the activity of reverse transcriptase, an enzyme produced by HIV that allows it to infect cells and make more viruses.