Can I stop Wegovy for a week — and what happens if I do?

Why one week off is more than just a skipped injection

Semaglutide is not a daily tablet you can miss once without much consequence. Because it is given once a week, each pen covers seven days of drug activity, and its roughly seven-day half-life means that by the time a week has passed since your last dose, plasma levels have roughly halved. Skip that dose entirely, and by the time you would be due the next one, the appetite-suppressing and gastric-emptying effects will have faded considerably.

The STEP 1 trial, published in the New England Journal of Medicine, followed more than 1,900 adults on semaglutide 2.4mg for 68 weeks. Participants who completed the programme had lost around 15% of their body weight on average. The same trial's withdrawal extension then showed that roughly two thirds of the weight lost was regained within a year of stopping entirely. One week is obviously not the same as stopping permanently, but the pharmacokinetics tell you that even a short gap shifts the balance.

For practical context: if you take your dose on a Monday and something unavoidable comes up the following weekend, you are not in crisis. The NHS's semaglutide guidance notes that a missed dose can be taken up to five days late; if more than five days have passed since the scheduled injection, skip that dose and carry on with the next one on its usual day. That is the standard missed-dose instruction, not a prescription for extended breaks.

What actually happens to your body during a week's pause

Three things tend to shift when semaglutide levels drop. First, appetite regulation loosens. GLP-1 receptor agonists work partly by acting on hunger centres in the brain and slowing how quickly the stomach empties; as those effects fade, many people find food feels appealing again more quickly than it did on treatment.

Second, blood sugar regulation changes, particularly for anyone using Wegovy alongside a diagnosis of type 2 diabetes or prediabetes. The glucose-lowering effect is smaller at the 2.4mg weight-management dose than in dedicated diabetes medicines, but it is not zero, so metabolic stability can shift during a break.

Third, and most practically: when you restart, your GI system may react as if it is encountering the medicine for the first time. Nausea, loose stools and stomach discomfort are most common in the early weeks of treatment and after dose increases; a restart after a week off can reproduce those symptoms, sometimes sharply. Your prescriber may recommend dropping back a dose step before titrating up again, rather than continuing from where you left off.

If you are thinking about a longer gap, our page on stopping Wegovy for two weeks goes into more detail about what changes when the break extends.

When a pause might genuinely be necessary

There are legitimate reasons a week off might come up. Planned surgery is the clearest one. NHS England advises anyone on a GLP-1 medicine to tell their anaesthetist and surgical team before any procedure, because slowed gastric emptying raises the risk of regurgitation under anaesthetic. Some teams ask patients to stop for a period before the operation date; how long depends on the procedure and the anaesthetist's assessment, not a fixed rule you can apply yourself.

A supply gap is another common reason. If your pen is delayed and you are wondering whether to restart at the same dose, the answer is: check with your prescriber first. Stock availability, the length of the break, and where you are in the titration schedule all affect what the right next step is. You can find general information about Wegovy and how the supply process works on our Wegovy overview page.

Travel is sometimes raised, though it is less of a genuine barrier than people expect. The pen needs to be kept refrigerated before use, but the Patient Information Leaflet covers the limited room-temperature window for travel; read that document rather than relying on secondhand advice for the exact figures, because the guidance is specific and matters.

If a break is forced on you rather than planned, the most useful thing is to contact your prescribing team promptly. At nume, aftercare support is available seven days a week, so there is no need to wait until Monday morning.

Restarting after a one-week gap: the practical picture

If you missed one week's dose, the missed-dose rule above usually applies: inject as soon as you remember, as long as you are within five days of when it was due, then return to your regular schedule. If six or seven days have passed, skip it and pick up on the usual day next week. That keeps you on track without doubling up.

If the break was planned and discussed with your prescriber, follow whatever they recommended. They may have asked you to restart at the dose below your current one, especially if you are at a higher strength (say, 1.7mg or 2.4mg) where GI effects can be more pronounced on restart, and our page on whether you can stop Wegovy for a month explains how those considerations scale up when a break is significantly longer. A prescriber who knows your history is better placed than any general article to make that call.

For anyone thinking about what Wegovy treatment looks like week by week, our pages on week six of Wegovy and the week seven experience cover what many people notice at those specific points in the schedule. And if cost is a factor in why a break is being considered, our guide to Wegovy pricing in the UK sets out what private treatment typically costs and what to watch for.

The short version: one missed week is manageable with the right guidance, but it is not a decision to make in a vacuum. A quick conversation with your prescriber before you pause will save a lot of uncertainty afterwards. If you are not yet in treatment and are thinking about starting, you can begin a free consultation with our clinical team and have your case reviewed the same day by a GPhC-registered prescriber.