PrEP 101 → Missed a PrEP dose
Adherence · quick helpMissed a PrEP dose? Here's exactly what to do
First, don't panic — PrEP is forgiving, and one missed pill rarely leaves you exposed. What to do depends on which PrEP you're on. Find your situation below.
Daily pill (Truvada or Descovy)
- Missed one pill? Take it as soon as you remember, then continue as normal. Don't take extra to "catch up" beyond the missed one.
- How much is enough? For anal sex, 4+ pills a week keeps protection high. For vaginal/front-hole sex, you need near-daily dosing (~6–7/week).
- Threw up within ~2 hours? It may not have absorbed — take another. After 2 hours, it's fine.
- Missed several days? Use condoms, restart daily dosing, and remember you're protected again after ~7 days (anal) / ~20 days (vaginal). Ask your provider if unsure.
Injection (Apretude or lenacapavir)
- Apretude has a 7-day grace window around the 2-month date. If you'll be more than 7 days late, contact your clinic — you may need to bridge with daily oral PrEP so there's no gap.
- Lenacapavir is every 6 months; if you can't make the window, your provider uses oral bridging to keep you covered.
- Put your next appointment in your calendar the day you get an injection — it's the easiest way to never fall out of the window.
On-demand "2-1-1"
- Missed the "2" pre-dose (2–24 h before sex)? You are not protected for that episode — use condoms, and consider PEP if a high-risk exposure already happened.
- Missed the 24 h or 48 h pill? Take it as soon as you remember and keep the schedule; continue one pill daily until 48 h after the last sex.
- Full schedule detail is in the gay & bi men's guide.
When to think about PEP
- Set a daily alarm or anchor PrEP to a habit (coffee, teeth) so misses are rare.
- Keep a few spare pills where you'll be (bag, work, a partner's place).
- Travelling? See time-zone dosing.
- Struggling to keep up? Ask about an injection — see the options.
Missed PrEP dose — FAQ
Am I still protected after one missed pill?
Almost certainly, especially for anal sex where 4+ doses a week is protective. Just resume daily dosing.
How many pills a week do I actually need?
Anal sex: 4+ a week. Vaginal sex: near-daily (~6–7). Don't rely on lower for vaginal exposure.
I stopped PrEP a while ago and want to restart — how?
Get an HIV test first, then restart daily; you're protected again after ~7 days (anal) / ~20 days (vaginal). Your provider can guide restart.
Does missing doses cause resistance?
Resistance is mainly a risk if you take PrEP while already having undiagnosed HIV — which is why testing before (re)starting matters. Occasional missed doses in an HIV-negative person don't cause resistance.
Tired of remembering a daily pill?
Injectable PrEP protects for 2 or 6 months at a time. See how the options compare.
Related
🔬 Sources & review
- U.S. CDC — PrEP Clinical Practice Guideline (2021) (adherence & dosing).
- Product labelling for Truvada, Descovy, Apretude and Yeztugo (lenacapavir).
✔ Last medically reviewed: 17 July 2026 · Prepmedication.com Medical Review Team · How we review →
Medical disclaimer. General information, not medical advice. If you may have been exposed to HIV in the last 72 hours, see PEP now.
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