Forgot to take your Wegovy shot yesterday? Here's what the guidance says

The five-day rule: where it comes from and why it exists

Wegovy (semaglutide 2.4mg) works by maintaining a sustained level of GLP-1 receptor activity. Because it has a half-life of roughly seven days, a single missed injection does not produce an immediate drop-off the way a missed daily tablet might. That pharmacological staying power is precisely why the five-day window exists: semaglutide lingers long enough that a slightly delayed dose still overlaps meaningfully with the previous one.

The Wegovy SmPC, published on the electronic Medicines Compendium (eMC), sets out the rule clearly. If five or more days remain before your next scheduled day, take the missed dose as soon as you notice. If fewer than five days remain, leave it and inject on your normal day as planned. The underlying logic is consistent across the STEP clinical programme, which studied semaglutide's behaviour across thousands of participants over 68 weeks.

One misconception worth setting aside gently: some people assume that missing a dose means they need to restart titration from 0.25mg. They don't. Unless treatment has been paused for several weeks at clinical direction, a single skipped shot does not require stepping back through the dose schedule. Your prescriber is the right person to confirm this for your specific situation.

If you are unsure which day to treat as your new 'usual' day going forward, the guidance on choosing a consistent Wegovy injection day walks through how to anchor your schedule practically.

What actually happens to your body when you miss one shot

Missing one weekly injection of Wegovy is unlikely to undo meaningful progress. The STEP 1 trial, published in the New England Journal of Medicine, found an average body-weight reduction of around 15% over 68 weeks at the 2.4mg maintenance dose — a result driven by sustained weekly dosing across the full study period, not by perfect adherence at every single timepoint. Real-world treatment is rarely flawless, and the medicine's long half-life provides a degree of biological buffer.

What you may notice after a missed injection is a slight return of appetite or a marginal change in how full you feel — both expected, both temporary. Some people also experience a modest return of nausea after resuming, particularly if they are still in the earlier titration stages. That is a normal physiological response, not a sign that something has gone wrong.

The more practical concern is schedule drift. If you have forgotten to take your Wegovy shot and are unsure how to get back on track, missing doses intermittently, or taking them at irregular intervals, can make it harder to track which day you are on and whether your five-day window applies. If you find yourself regularly forgetting, it is worth reading the practical tips on picking a consistent time and day for your injection, anchoring it to a weekly habit tends to help.

How to handle repeated missed doses, and when to contact your prescriber

A single forgotten injection, handled by the five-day rule, needs no clinical contact. But there are situations where reaching out to your prescriber is the right move. If you are wondering what to do if you forget to take your Wegovy more than once in a row, or if you are unsure whether your current titration step is still appropriate, or if you notice symptoms that feel unusual after resuming, those warrant a conversation rather than a guess.

Equally, if you are approaching a planned dose increase and a missed injection has created ambiguity about timing, your prescriber can confirm whether to proceed or hold at your current dose for another week. Dose increases with Wegovy follow roughly four-week steps, and the timing of each step matters for tolerability.

For people who use their injections as part of a broader weight-management plan, including lifestyle changes alongside treatment, a consistent routine supports both the medicine and the habits around it. The full guide to taking your Wegovy injection correctly covers technique, site rotation and storage alongside the scheduling questions.

If you are thinking about whether Wegovy is the right treatment for you, or if you have broader questions about starting or continuing, checking your eligibility through a free consultation is a good place to start. Our prescribers review every consultation personally and can address missed-dose questions in context. Details about the wider semaglutide landscape, including how Wegovy sits alongside other options, are covered on the semaglutide treatment page.