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Small correction: PrEP (pre-exposure prophylaxis) and PEP (post-exposure prophylaxis) are both protocols for using drugs to prevent infection. You generally take PrEP drugs every day if you think you're in danger of being exposed, or alternatively take PEP if you think you have been exposed to HIV without any kind of protection, sort of like a morning after pill (but every day for a whole month).

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Something I learned today: PrEP also works "on demand", so for some people it may not be necessary to take it every day.

https://www.aidsmap.com/news/jul-2020/demand-prep-highly-eff...

> ...sort of like a morning after pill (but every day for a whole month).

Does this mean that there is a cure, but it only works if taken shortly after exposure (and for a whole month)?

Not a cure, as that implies recovery from a full infection. It's preventing your body from becoming fully infected.

It's a post-exposure treatment, don't think that qualifies as a cure. Same thing with the rabies vaccine, it'll only save your life if given before any symptoms occur (and the disease has entrenched itself in the body).

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