Is it OK to miss a week of Wegovy — and what should you do next?

The misconception: skipping once means starting over

The most common worry our prescribers hear is that a single missed injection will erase progress, trigger weight regain, or force a return to the lowest dose. It will not. Semaglutide has a long half-life (roughly one week) which means the medicine is still present in your bloodstream for several days after a missed injection. One gap in your schedule does not wipe the slate clean. The Wegovy treatment programme is designed around weekly dosing precisely because the pharmacology is forgiving across a short window.

What people sometimes confuse is the effect of a prolonged break. A week missed is very different from three or four weeks missed. If you are wondering whether it is okay to miss a week of Wegovy, the short answer is that a single gap is a practical hiccup, while three or four weeks missed may mean your body has lost some tolerance and restarting at a higher dose could bring back the nausea and discomfort you worked through at the beginning. Your prescriber needs to know about any extended gap.

The NHS guidance on weight-management injections is clear that dose decisions (including what to do after a missed injection) belong with the clinical team, not with general advice found online. If you are unsure, contact your prescriber before injecting.

What actually happens in the five-day window

Semaglutide's mechanism is gradual. It raises fullness signals, slows gastric emptying and reduces appetite over time, not in a single-dose spike. One missed injection produces a gentle tapering effect rather than an abrupt stop. Most people notice slightly reduced appetite suppression by days four to six, and some describe feeling a little hungrier than usual, which can be disconcerting if it is the first time it has happened. That is normal and expected.

The practical guidance from the Patient Information Leaflet is straightforward, and our page on whether you can miss a week of Wegovy walks through it in full: if you realise you have missed a dose and fewer than five days have passed, inject as soon as you can and then carry on with your normal weekly schedule. If five days or more have elapsed, leave that dose out altogether. Simply resume your next injection on the day it would ordinarily fall. Either way, do not inject twice in one week. The semaglutide information page explains the wider pharmacology if you want more background on how the medicine works day to day.

Travel, illness, a delayed delivery, these are the most common reasons a dose gets missed, and none of them require an emergency call. Worth knowing, though: your pen arrives by tracked DPD delivery in plain, unbranded packaging, so if a future pen is on its way you can follow its progress in real time and plan your injection day accordingly.

When a missed week becomes something to act on

There are two situations where a missed week should prompt more than a quick schedule adjustment. First, if you have missed two weeks in a row, the clinical guidance points towards discussing whether to step your dose back. Jumping straight back to, say, 1.7mg or 2.4mg after a two-week break can produce the kind of gastrointestinal side effects (nausea, vomiting, diarrhoea) that you experienced (and, hopefully, moved past) during initial titration. A prescriber may recommend briefly returning to the previous dose tier to let your system readjust. Our page on missing two weeks of Wegovy covers this scenario in more detail.

Second, if missed doses are happening regularly (because of side effects, cost, lifestyle, or simply forgetting) that pattern is worth raising with your prescriber rather than managing alone. Consistent gaps reduce efficacy, and there may be practical solutions: a different injection day, a reminder system, or a clinical conversation about whether the dose level is right for you. The NHS England guidance on weight-management injections notes that lifestyle and behavioural support alongside the medicine is important for sustained outcomes, something easily overlooked when the focus is solely on the weekly injection.

For those weighing up the full cost picture of staying on treatment, the Wegovy supply and pricing page sets out what to look for in a legitimate UK provider, which is worth reading if cost pressures are contributing to the missed doses.

Safety note: what symptoms warrant calling for help

A missed dose itself does not cause harm. But if you experience anything unusual around the time you restart (severe stomach pain that radiates to your back, persistent vomiting, or signs of a serious allergic reaction such as swelling or difficulty breathing) seek medical attention promptly. The MHRA's January 2026 Drug Safety Update highlighted acute pancreatitis as an infrequent but serious risk with GLP-1 medicines; severe, persistent abdominal pain is the key symptom to take seriously and not wait out. You can report any suspected side effects directly through the MHRA Yellow Card scheme.

If you have any doubt about how to restart after a gap, the right call is to contact your prescriber before injecting rather than after. At nume, prescriber support runs seven days a week, getting a clear answer takes minutes, and it means you restart with confidence rather than guesswork. You can read more about how our clinical team approaches aftercare on the clinical team page.