PrEP 101 → Stopping PrEP
Stopping & restartingStopping PrEP: how to stop safely
You don't have to take PrEP forever — you can stop when your risk goes down and restart later. But timing matters, and there's one important safety check (hepatitis B). Here's exactly how to stop, how long PrEP stays in your system, and how to come back to it.
⏱️ When can I stop PrEP?
Don't just stop the day of your last risk — keep taking PrEP for a window afterward so protective drug levels cover that last exposure. The window depends on the kind of sex:
| Your situation | Keep taking PrEP for… | Then |
|---|---|---|
| Anal sex | at least 7 days after last exposure | You can stop |
| Vaginal / front-hole sex | at least 28 days after last exposure | You can stop |
| Shared injection equipment | at least 28 days after last risk | You can stop |
| On-demand 2-1-1 | 1 pill/day until 48 h after last sex | Already built in |
⚠️ The hepatitis B warning — read this first
Truvada and Descovy don't just work against HIV — they also suppress hepatitis B. If you have chronic hepatitis B and stop PrEP suddenly, the hepatitis can flare and damage your liver. This is the single most important reason to plan stopping with a provider rather than just quitting.
🧪 How long does PrEP stay in your system?
PrEP is made of two medicines — tenofovir and emtricitabine. They clear from your bloodstream within a couple of days, but the part that actually protects you sits inside your cells and fades more slowly:
Descovy behaves the same way — it clears the blood fast but leaves protective levels inside cells for about a week. There is no withdrawal and PrEP is not addictive.
🔄 Do I have to take PrEP forever?
No. PrEP is for as long as you could benefit from it — not for life. Plenty of people use it during a season of their life (a new relationship status, a period of dating, travel) and stop when things change. You can stop and restart as many times as you need.
- Stopping: finish your 7-day (anal) or 28-day (vaginal/injection) window, confirm hep B status, done.
- Restarting: get an HIV test first, then restart daily — you're protected again after ~7 days (anal) / ~20 days (vaginal).
- In between: consider on-demand 2-1-1 (anal sex) or an injection so protection doesn't depend on a daily pill.
- Had a possible exposure during a gap? See PEP (works within 72 hours).
❓ Stopping PrEP — FAQ
What happens if you stop PrEP?
Protection fades over about 7–10 days and you're no longer protected against HIV. No withdrawal, not addictive — but if you have hepatitis B, stopping can cause a liver flare, so plan it with your provider.
Can I stop PrEP after 7 days?
For anal sex, keep taking it for at least 7 days after your last exposure, then you can stop. If you'd only just started and then had a risk, you may not have been fully protected yet.
Can I stop for just a week and restart?
You can, but protection fades within 7–10 days, so a week off can leave you unprotected. If you'll be at risk again soon, on-demand or injectable PrEP may suit you better.
How long does PrEP (or Descovy) stay in your system?
Cleared from blood in a couple of days; protective levels in cells fade over about a week. Descovy is the same.
Are there side effects from stopping?
Usually none. The exception is hepatitis B — see the warning above.
Do I have to take PrEP forever?
No — take it while you could benefit, stop when you don't, restart when you do.
Not sure you still need PrEP?
Take the private 2-minute check — or see the easier ways to stay protected without a daily pill.
Related
🔬 Sources & review
- U.S. CDC — PrEP Clinical Practice Guideline (2021) (discontinuation & hepatitis B considerations).
- Product labelling for Truvada (TDF/FTC) and Descovy (TAF/FTC) — hepatitis B warnings and pharmacokinetics.
✔ Last medically reviewed: 22 July 2026 · Prepmedication.com Medical Review Team · How we review →
Medical disclaimer. General information, not medical advice. Don't stop PrEP — especially if you have hepatitis B — without talking to a provider. If you may have been exposed to HIV in the last 72 hours, see PEP.
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