What to Do After Missing ART, PrEP, or PEP
ART, PrEP, and PEP are antiretroviral medicines with different purposes and missed-dose instructions.
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Contents
ART, PrEP, and PEP are antiretroviral medicines with different purposes and missed-dose instructions. The answer depends on the medicine, regimen, time elapsed, and health needs. Check the label or patient information and contact the clinic or pharmacist; do not apply one rule to all three.
If You Miss ART
Follow regimen-specific instructions. In general, do not take two doses together unless your care team explicitly tells you to. If doses are missed often, do not stop or change treatment yourself. Ask about reminders, viral-load monitoring, and interactions. One missed dose does not cause immediate resistance, but repeated gaps can allow treatment failure.
If You Miss PrEP
Protection depends on daily, 2-1-1, or injectable dosing, the exposure site, and how many doses were missed. Use condoms or avoid exposure until a provider confirms that protection has returned. After an exposure during a gap, seek a PEP assessment urgently and no later than 72 hours.
If You Miss PEP
PEP is an emergency 28-day course. Contact the clinic or pharmacist immediately for advice based on the delay. Do not abandon the course or double the dose yourself, and complete follow-up testing.
Reducing Missed Doses
- Set reminders and connect medicine with a routine.
- Carry a backup supply using the storage instructions on the label.
- Ask for help when cost, clinic hours, side effects, or privacy concerns interfere with dosing.
Verified references
Links and relevance to the article’s main topic were reviewed on 13 August 2026. Each source supports only the scope stated in the original document and does not replace personalised medical, legal, or service advice.
- NIH HIVinfo: HIV Treatment Basics Accessed 13 August 2026
- NIH HIVinfo: HIV Medicines and Side Effects Accessed 13 August 2026
- WHO: HIV and AIDS fact sheet Accessed 13 August 2026
