How long can you go between Wegovy doses — and what happens if the gap stretches?

You missed a dose and you're not sure whether to take it now

Picture this: it's Thursday evening and you've just realised your Sunday injection never happened. The question our prescribers hear most weeks is exactly this, not "did I break something" but "what do I do right now?"

The answer depends on timing. Wegovy's patient information leaflet, which follows the NHS guidance on semaglutide, is clear on the two-day rule. If five or more days remain before your next scheduled dose, go ahead and take the missed one now, then continue your usual weekly day from that point. If you are within two days of when the next dose is due, leave the missed one entirely and carry on as planned. You do not double up, ever.

The logic behind this is pharmacological. Semaglutide has a half-life of roughly one week, which is part of why once-weekly dosing works at all. A single missed injection does not immediately erase the medicine's presence in your system, but the further the gap extends, the more meaningfully blood levels drop. Re-starting after a significant break can feel similar to beginning a new dose increase: nausea and other gastrointestinal effects may return, because your body has partially readjusted.

For the precise wording on missed doses and timing windows, the Wegovy SmPC listed on the Electronic Medicines Compendium (eMC) is the definitive reference. Your prescriber or pharmacist can walk you through it if any part is unclear.

How a longer gap affects tolerability at each dose level

The further you are along the titration schedule (0.5mg, 1.0mg, 1.7mg, 2.4mg) the more noticeable a prolonged break tends to be when you restart. At the starter dose, the body is still adjusting; at higher doses, it has partly acclimatised. A gap of two or three weeks at 2.4mg can mean the next injection lands harder than expected, with a resurgence of nausea, fatigue or loose stools that had settled down.

This does not mean you need to step back to a lower dose automatically, but it is worth flagging to your prescriber before you inject again, especially if the gap ran to three weeks or more. They may suggest restarting at a lower strength and re-titrating, or they may be comfortable with you continuing at the current level depending on how long you have been on it. There is no single right answer; it is a clinical judgement based on your individual history.

If you are curious about the differences between dose levels and what each step in the titration is actually doing, the detail on what changes between 1.7mg and 2.4mg Wegovy is worth reading before your next prescriber conversation. And for the broader picture of how long most people stay at each stage, the 0.5mg stage explained gives useful context on the overall pace of treatment.

When the gap becomes clinically significant, and what to do

A brief overshoot of your injection day by a couple of days is unremarkable. A gap of three to four weeks starts to change the picture meaningfully. Beyond four to five weeks, most prescribers would treat this similarly to a fresh start: your system has essentially cleared the medicine, and restarting at the current dose level without clinical guidance carries a real risk of poor tolerability.

There are circumstances where gaps happen unavoidably (illness, a supply disruption, travel) and the right response differs in each case. If you have been unwell with severe vomiting or diarrhoea, the question of when to restart intersects with hydration and kidney function, not just scheduling. Supply interruptions are a known feature of the current GLP-1 landscape; if you are concerned about availability, checking in with your pharmacy before you run out gives you the most options.

For context on what a sustained gap eventually means for your treatment plan, the guide to how long you can miss a Wegovy dose covers the clinical thresholds in more depth. The question of how precise the seven-day interval needs to be day-to-day is addressed in detail at how many days between Wegovy doses.

Surgery is a separate situation worth mentioning here. NHS England advises that anyone taking a GLP-1 medicine should inform their surgical and anaesthetic team before any planned procedure, there are specific considerations around gastric emptying and aspiration risk that the team needs to account for. This is not a reason to stop treatment without guidance; it is a reason to have that conversation early.

If you are thinking about where you are in the overall arc of treatment (how long you might stay on Wegovy, whether 2.4mg is a long-term destination, or whether the newer 7.2mg dose changes anything) staying on 2.4mg long term and the early experience with 7.2mg are both worth a read. For cost context as part of a longer treatment plan, a straightforward Wegovy price comparison sets out what private treatment typically involves.

If you have missed several doses, have an unplanned gap of more than a couple of weeks, or are simply unsure what to do next, a prescriber conversation is the right move. At nume, a GPhC-registered prescriber reviews every consultation the same day, no algorithm, no automated queue. Start your free consultation and get a clear answer for your specific situation.