What Is HIV PrEP?

There’s no vaccine for HIV, but it can be prevented. 

If your sexual partner is HIV-positive, if you have more than one sexual partner, or if you share needles with someone who has HIV—you can lower your chances of getting HIV by taking a medicine for Pre-Exposure Prophylaxis (called PrEP).

In 2012, the FDA approved a new medication called Truvada, also called tenofovir disoproxil fumarate/Emtricitabine (TDF/FTC) for use as HIV Pre-Exposure Prophylaxis (PrEP). Truvada is commonly known as the pill for PrEP.

How Does PrEP Work?

Truvada is a pill you take every day that helps you prevent getting HIV. When this medicine builds up inside your bloodstream, it can stop the HIV virus from spreading inside your body.

But you must take Truvada every day for it to work.

Make an Appointment

To make an appointment for HIV PrEP, call us at 801-585-2512. We'll help you find the location that's closest to you.

Free HIV PrEP Clinic—Redwood Health Center

If you don't have health insurance, we offer free HIV PrEP at University of Utah Health's Redwood Health Center.


Redwood Health Center
1525 West 2100 South 
Salt Lake City, UT 84119


Redwood Health Center gives free PrEP on 2 Saturday mornings every month.

Call 801-585-2512 Monday—Friday to request an appointment. Or schedule an appointment here.

This clinic is only for people who don't have health insurance. If you have health insurance, please visit one of our other locations that offer PrEP.

How Effective is PrEP?

Taking PrEP every day is very effective at lowering your chances of getting HIV.

In fact, multiple clinical trials show that people who take PrEP once each day lower their odds of contracting HIV by 90%.

But, PrEP is much less effective if you don't take it every day and follow your doctor's instructions.

Currently, TDF/FTC (Truvada) is the only medication approved for use as PrEP. But other medicines are in clinical trials, and researchers think that more options for PrEP will be developed soon.

You can learn more about PrEP from the CDC's website.

You can also calculate your risk (odds) of getting HIV using the CDC's HIV risk calculator.

PrEP Side Effects

For some people, PrEP can cause nausea, but the nausea usually goes away quickly.

People who take PrEP haven't reported any other serious side effects. PrEP is safe to use, and the side effects from it aren't life-threatening.