PEP vs PrEP: Which HIV Prevention Medicine Is Needed?

PEP and PrEP sound similar, but they are used in very different situations.

The easiest way to remember the difference is simple: PEP is taken after a possible HIV exposure. PrEP is taken before future exposures.

Both use antiretroviral medicines, but neither should be started without appropriate medical guidance and HIV testing.

WHAT IS PEP?

PEP stands for post-exposure prophylaxis. “Post-exposure” means after a possible exposure has already happened.

PEP is an emergency treatment that must be started as soon as possible and no later than 72 hours after the exposure. When prescribed, it is generally taken for 28 days.

PEP may be considered after sex without a condom, condom breakage, sharing injection equipment, sexual assault, a needle-stick injury or another significant exposure to potentially infectious blood or body fluid.

WHAT IS PREP?

PrEP stands for pre-exposure prophylaxis. “Pre-exposure” means before an exposure happens.

PrEP is intended for HIV-negative people who may have an ongoing or repeated risk of acquiring HIV. It is part of a combined HIV-prevention approach.

PrEP may be discussed when a sexual partner has HIV and viral suppression is uncertain, condoms are not used consistently, PEP has been needed more than once, there are repeated potential exposures, or injection equipment may be shared. Eligibility is determined individually and without judgment.

PEP VS PREP: THE MAIN DIFFERENCES

PEP is used after a possible exposure. PrEP is used before possible future exposure.

PEP is an emergency. PrEP is planned prevention.

PEP should start as soon as possible and no later than 72 hours after exposure. PrEP is started before or during a period of ongoing risk.

PEP is generally taken for 28 days. PrEP is used for as long as protection is needed, with regular medical follow-up.

Both require HIV testing and medical guidance. Neither prevents other sexually transmitted infections or pregnancy.

I HAD AN EXPOSURE TODAY. DO I NEED PEP OR PREP?

If the exposure happened within the last 72 hours, seek an urgent PEP assessment.

PrEP is not a replacement for PEP after a recent significant exposure. A doctor may advise completing PEP first and then transitioning to PrEP if future risk is expected.

CAN I START PREP WITHOUT AN HIV TEST?

No. PrEP is for people who do not have HIV. HIV testing is required before starting it because using an incomplete prevention regimen during undiagnosed HIV infection could complicate treatment.

Additional tests may be advised depending on the medicine and your health history.

DOES PREP PROVIDE IMMEDIATE PROTECTION?

Not necessarily. The time required to achieve protection depends on the medicine, dosing approach and type of exposure. Do not assume that taking one or two tablets provides immediate protection. Follow the schedule prescribed by a clinician.

ARE PEP AND PREP COMPLETELY EFFECTIVE?

No prevention method offers a 100% guarantee. Protection depends on choosing the appropriate method, starting it at the correct time and taking the medicine as prescribed.

Neither PEP nor PrEP protects against pregnancy or other sexually transmitted infections. Condoms and recommended screening may still be important.

IS PREP ONLY FOR A PARTICULAR COMMUNITY?

No. PrEP is based on a person’s HIV exposure risk, not their identity, gender, orientation or marital status. Counseling should be confidential, respectful and free from judgment.

CAN I USE PEP EVERY TIME AN EXPOSURE HAPPENS?

PEP is intended for emergencies. If you repeatedly need PEP, PrEP may provide a more suitable planned prevention strategy. Your doctor can also discuss testing, condoms, partner treatment and other risk-reduction measures.

CONFIDENTIAL PEP AND PREP COUNSELING IN PATNA

Patna HIV Clinic provides confidential PEP and PrEP assessment with Dr. Pratyush Kumar.

If an exposure occurred within 72 hours, request urgent PEP assessment. If you are concerned about continuing risk, book a PrEP consultation. If you have already taken medicines, carry their names or packaging to the appointment.

Call or WhatsApp 9241952419.

FREQUENTLY ASKED QUESTIONS

Can PrEP be taken only before one planned exposure?

Different PrEP approaches exist, but they are not suitable for every person or type of exposure. Do not use an event-based schedule without advice from an experienced clinician.

Do I need condoms while taking PrEP?

PrEP helps prevent HIV but does not prevent other sexually transmitted infections or pregnancy. Condoms may provide additional protection.

What happens after completing PEP?

You will need follow-up HIV testing. The doctor may also discuss PrEP if future exposure risk is expected.

Can someone with HIV take PrEP?

A person diagnosed with HIV needs a complete HIV treatment regimen, not PrEP alone.

References: CDC — Preventing HIV with PEP; WHO implementation guidance for PrEP.

Medical disclaimer: This article provides general information. PEP and PrEP require individual assessment, testing and medical supervision.

Author: Dr. Pratyush Kumar, Patna HIV Clinic.