My sex partner is taking HIV medications to treat his/her HIV. Will my anti-HIV medications interact with the HIV medications he/she is taking?

No, your anti-HIV medications will not interact with the HIV medications that your partner is taking. The anti-HIV medications you are taking work to prevent HIV infection from happening in your body and nobody else’s, and vice versa.

Also on a similar note, sharing medications with each other is a big no-no. Not only does sharing mean your partner could run out of meds unexpectedly (and be at risk for developing drug resistance), the medications your partner takes may not be the same ones used in safe and effective PrEP.