Information taken from cdc.gov.
WhAT IS PREP?
PrEP (pre-exposure prophylaxis) is a medication that people at risk for HIV take to prevent getting HIV from sex or injection drug use.
There are two medications approved for use as PrEP: Truvada® and Descovy®. Truvada® is for all people at risk through sex or injection drug use. Descovy® is for people at risk through sex, except for people assigned female at birth who are at risk of getting HIV from vaginal sex.
SHOULD I TAKE PREP?
PrEP may be right for you if you test negative for HIV, and any of the following apply to you:
You have had anal or vaginal sex in the past 6 months and you have a sexual partner with HIV (especially if the partner has an unknown or detectable viral load), have not consistently used a condom, or have been diagnosed with an STD in the past 6 months.
Also, if you inject drugs and you have an injection partner with HIV, or share needles, syringes, or other equipment to inject drugs (for example, cookers).