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> You're safer having unprotected sex with someone who is confirmed to have HIV but is taking PrEP, than you are when having unprotected sex with someone whose status is unknown.

PrEP is for hiv negative people.

If you’re virus level is undetectable from treatment, then you’re not contagious.

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Correct! Wife works in the field (source for my anecdote), and she confirmed I was confusing PrEP with antiviral treatment.

>PrEP is for hiv negative people.

It's a rather academic distinction given that it's the same drugs in either case. Definitionally, it's PrEP only if those drugs are being taken as a preventative measure.

This is an actual distinction. At present PrEP only means Truvada. Truvada is not effective alone for treating HIV. It would be taken in combination with another drug. Also, There's a newer alternative to Truvada that is preferred/less toxic for HIV treatment, but is not yet approved for PrEP. To be clear there are many more drugs used for HIV treatment that are not used for PrEP.

Descovy was approved for PrEP about 2 month ago. At least in the US.

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