I took the wrong dose of Wegovy – what happens next

Why the titration schedule exists — and what goes wrong when it's disrupted

The STEP 1 trial, published in the New England Journal of Medicine, studied semaglutide 2.4mg over 68 weeks and reported around 15% average body-weight reduction. That result was built on a slow dose escalation, not a standing start at the full maintenance dose. The schedule exists for a reason: starting low gives the gut time to adapt to slower gastric emptying and the appetite-suppressing effects of GLP-1 receptor activation. Jump ahead, and the same mechanisms that help you eat less can cause nausea, vomiting and diarrhoea significant enough to make you want to stop altogether.

So if you've accidentally taken a higher dose than your prescriber intended, you're not in uncharted territory. The side effects may be more pronounced for a few days. That's uncomfortable, but it's the body responding to the medicine doing what it's designed to do, not a sign that something has gone permanently wrong. Staying hydrated matters here. Small, plain meals can help. The NHS semaglutide page lists the common side effects and the pattern most people follow: symptoms tend to peak shortly after a dose and ease within a few days.

A missed dose is a different situation. According to the Wegovy SmPC, if you miss a weekly injection and your next scheduled dose is more than five days away, you can take it as soon as you remember. If the next dose is five days away or fewer, skip the missed one and carry on with your usual schedule. The key is not to double up. Two doses close together amplifies the side-effect burden without proportionate benefit.

Taking too high a dose (what to monitor and when to act

There's a misconception worth addressing gently here: many people assume that taking a higher dose of a weight-loss medicine is simply a shortcut) more medicine, faster results. That's not how semaglutide works in practice. Efficacy at each dose level reflects weeks of steady exposure. A single extra-high injection doesn't compress that timeline; it mostly shifts the side-effect risk upward. Our guide to taking too high a dose of Wegovy covers this in more detail if that's what happened to you.

Most people who take a higher dose than prescribed experience a wave of gastrointestinal symptoms: nausea is most common, often accompanied by reduced appetite, some stomach discomfort and, for a portion of people, vomiting or loose stools. These are consistent with the safety profile observed across the STEP programme and are the reason the prescribing schedule is gradual by design.

The MHRA issued a Drug Safety Update in January 2026 specifically about GLP-1 medicines and acute pancreatitis, a rarer but more serious risk. Severe stomach pain that spreads to the back, with or without vomiting, warrants urgent medical attention rather than a wait-and-see approach. If that describes what you're experiencing, contact your GP or call 111. You can also report suspected side effects via the MHRA Yellow Card scheme, which helps build the national safety picture for medicines like Wegovy.

Accidentally taking a double dose, what's different and what to do

Injecting twice in one week by mistake, perhaps because the first injection wasn't clearly registered or a new pen was started in error, is more common than most people admit. The clinical concern is the same as above (intensified side effects) but the context shapes what to do next. If this happened today, the practical steps are: note what time each injection was given, monitor for symptoms, drink plenty of water, and contact your treatment team. For a detailed walkthrough of this specific situation, our page on accidentally taking two doses of Wegovy covers the likely timeline and what to watch for.

Going forward, a simple log (the date, time and dose of each injection written in a notes app or on the pen box) removes most of the doubt. It's the practical advice a question our prescribers hear regularly, and the solution is genuinely that low-tech.

If you're uncertain whether you're on the right dose to begin with, the Wegovy dose guidance page explains how the titration schedule works across the full range. If you have questions about whether 1mg of Wegovy is considered a strong dose, that page sets out where it sits within the escalation and what to expect at that stage. For some people, questions about cost also arise during the titration period, particularly when doses change; the Wegovy price comparison page covers what to expect across the course of treatment.

Getting back on track after a dosing error

For most people, a single dosing error is a bump, not a derailment. Once any acute side effects have settled, the aim is to return to the schedule your prescriber set. Don't try to compensate for a missed dose by shortening the interval before the next one. Don't stay at a lower dose than prescribed without speaking to a clinician first. And if you've been taking the wrong strength for several weeks, that's a clinical conversation rather than something to self-correct.

The Wegovy overview page gives a clear picture of how the medicine is licensed and what the treatment is designed to achieve alongside diet and activity changes. If you have broader questions about weight management options, the weight-loss treatments overview covers the landscape. And if you'd like a prescriber to review your situation directly, you can speak to our prescribers through a free consultation, a real clinician reads every response the same day.