How long should post-exposure prophylaxis (PEP) be continued after potential HIV exposure?

AIIMS CRE 2025

Medical & Surgical Nursing

Easy

Appeared in: AIIMS CRE 2025

Explanation

The standard, evidence-based duration for HIV post-exposure prophylaxis (PEP) is 28 days, or 4 weeks.
This duration is recommended by major health authorities like the WHO and CDC.
A 28-day course is considered necessary to effectively suppress viral replication and prevent the virus from establishing a permanent infection in the body.
Starting PEP as soon as possible (within 72 hours) and completing the full 28-day course are critical for its success.

Option A: A 7-day course is too short and would be ineffective in preventing HIV from establishing an infection after exposure.
Option B: A 14-day course is also insufficient. It does not provide a long enough period of viral suppression to prevent the establishment of HIV.
Option D: This option confuses the duration of the medication regimen with the follow-up testing period. The medication is taken for 28 days, but follow-up HIV testing continues for several months (often up to 6 months) to confirm the person's status.

Visual 1: Infographic - A timeline illustrating the critical 72-hour window to initiate PEP, the 28-day medication course, and the subsequent follow-up testing schedule at 6 weeks, 12 weeks, and 6 months post-exposure. This helps differentiate treatment duration from the monitoring period.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain HIV Post-Exposure Prophylaxis (PEP) Duration as background academic context rather than a clinical decision trigger.
A nurse's primary role is to ensure PEP is initiated promptly (within 72 hours) and to provide comprehensive counseling on the importance of adherence to the full 28-day regimen.
Nurses must educate the patient about potential side effects (like nausea and fatigue) and strategies to manage them, as side effects are a common reason for non-adherence.
It is crucial to schedule and remind the patient about follow-up HIV testing to definitively determine their status after the exposure.

How to Approach the Question

First, identify the core question, which is asking for a specific time frame related to a medical protocol: the duration of HIV PEP.
This is a factual recall question. Your goal is to retrieve the standard, evidence-based guideline from your knowledge base.
Scan the options. They are all different time durations.
Recall that HIV PEP is an intensive, short-term treatment. Differentiate the treatment duration from the longer-term follow-up testing period.
Select the option that matches the standard treatment duration, which is 28 days or 4 weeks.
Eliminate shorter options (7, 14 days) as they are too brief to be effective, and longer options (3 months) as they likely refer to the follow-up window, not the treatment itself.

Concept Tested & Keywords

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