What happens if
I miss a PrEP dose?
One missed dose is not a crisis. Several missed doses in a row is a different situation. Here’s exactly what changes, and what to do about it.
Medically reviewed by Jude Ozioko, Pharmacist (PCN 024035) • Last reviewed October 2026
Missed doses and had an exposure? Message us within 72 hours. Get Advice Now →
People miss doses. It happens to everyone on long-term medication at some point. The important thing is knowing exactly what one missed dose means for your protection, and what several missed doses mean, so you can respond correctly rather than panic or, worse, assume nothing has changed.
Your protection is likely still intact. Here’s what to do.
Take the missed dose as soon as you remember, even if it’s later the same day. If you don’t remember until it’s almost time for your next regular dose, skip the missed one and continue your normal schedule. Never take two pills at once.
One missed dose in the context of otherwise consistent daily use is unlikely to drop tissue drug levels to a point where protection is meaningfully reduced. The drug fades gradually, not immediately.
This is when protection actually starts to drop. Act now.
Restart daily dosing immediately. Don’t wait for a “better time” to restart. Take your next dose today.
Use condoms consistently for at least 7 days (if your primary exposure is anal sex) or 21 days (if vaginal sex or injection drug use) while drug levels rebuild to protective concentrations.
If you had a potential unprotected exposure during the gap: contact our team within 72 hours. We’ll assess whether PEP is warranted alongside restarting PrEP.
Missing 2 or more doses in a week is particularly significant for people primarily at risk through vaginal sex or injection drug use, those tissues require higher sustained drug levels for protection compared to rectal tissue.
Consistent missing is a signal to reassess the approach, not to stop PrEP.
If you find yourself missing doses repeatedly, not just occasionally, that’s worth addressing directly. The options worth discussing with our team include switching to on-demand (2-1-1) dosing if you’re an MSM with predictable, planned sexual activity, or exploring long-acting injectable PrEP (cabotegravir), which eliminates the daily adherence requirement entirely. Injectable PrEP is given every two months and is increasingly available in Nigeria.
The goal is never to push daily pills on someone for whom they’re genuinely not working. The right format is the one you’ll actually use consistently.
Common questions about missed PrEP doses.
QWhat should I do if I miss a PrEP dose?
Take it as soon as you remember. If it’s nearly time for your next dose, skip the missed one and carry on normally. Never double up. One missed dose in the context of consistent use rarely compromises protection significantly.
QDoes missing one PrEP pill mean I’m unprotected?
No. One missed dose is unlikely to drop tissue drug levels enough to meaningfully reduce protection. The risk is repeated missed doses over several days, which gradually lowers concentrations in the tissues that need them.
QI missed several PrEP doses. What should I do?
Restart daily dosing immediately. Use condoms for at least 7 days (anal sex exposure) or 21 days (vaginal or injection drug use exposure) while protection rebuilds. If you had an unprotected exposure during the gap, contact our team within 72 hours to assess whether PEP is indicated.
Missed doses and worried about an exposure?
Message our team now. If it’s within 72 hours we can assess PEP, help you restart PrEP correctly, and make sure you’re covered going forward.
Message Us Now →A missed dose happens. What matters is what you do next.
Restart, use condoms during the gap, and call us if there was an exposure. That’s the protocol.
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