Technically, no. Post-Exposure Prophylaxis, vs. Pre-Exposure Prophylaxis.
I'm not a physician, but I have the impression that dosing may be different, as well as the context.
Uh, @easygoingpal & @TruthBTold , the guy we all have to thank is @whipped ; I merely shared his post from "pics of the day" to "armpit appreciation" (and did give him credit!).