Missing a Dose of Wegovy: the Guidance You Actually Need

Why a single missed week matters less than you might fear

Semaglutide, the active ingredient in Wegovy, has a plasma half-life of roughly one week. That long half-life is precisely why the medicine is designed as a once-weekly injection: meaningful levels remain in circulation for several days after a dose. The NHS semaglutide medicines guidance is explicit that missing one injection is unlikely to produce a dramatic change in your progress, provided you act quickly and do not double up.

That said, semaglutide's appetite-suppressing effect does taper off as levels fall toward the end of the week. Most people notice their hunger returning more noticeably two to three days after a missed dose compared with a day after. If you find yourself significantly more hungry than usual between injections, you can read more about what happens when you miss a Wegovy dose and what to do next, rather than trying to manage it alone.

For a broader look at how dosing and titration work across the full Wegovy schedule, the Wegovy doses guide covers each strength and how the gradual step-up is structured.

The practical rule in full, and why 'five days' is the threshold

Wegovy's Patient Information Leaflet sets the five-day boundary because it preserves a minimum gap between consecutive doses. Injecting two doses within four days of each other mimics the effect of a dose increase without the prescriber-supervised titration designed to protect tolerability. The gastrointestinal side-effect profile of semaglutide is dose-sensitive: nausea and vomiting that had settled at your current strength can return sharply if circulating levels spike unexpectedly.

Practically, the rule works like this. Say you inject every Thursday. You reach Sunday and realise you forgot Thursday's pen. Sunday is four days after Thursday and your next dose is due in three days, so the threshold is not met: skip Thursday's dose and inject as normal next Thursday. Now suppose you notice on Friday morning, the day after your usual day. Friday is one day late and next Thursday is still six days away: inject on Friday, then return to Thursday the following week.

One question our prescribers hear regularly is whether missing a wegovy dose means restarting at 0.25 mg. The answer is generally no for a single missed week. Two or more consecutive missed doses are a different matter; in that situation missing multiple Wegovy doses in a row carries its own considerations, and a prescriber should advise on whether to step back before resuming.

Routine, storage and what makes missed doses more likely

Most people who miss a weekly dose do so because the pen lives somewhere it is easy to overlook. A pen stored at the back of the fridge rather than in the door at eye level is surprisingly easy to forget on injection day. Keeping it at the front of the fridge shelf, or setting a phone reminder for the same time each week, removes most of the friction. Wegovy requires refrigeration between 2°C and 8°C; for the precise room-temperature storage window if you are travelling, the SmPC on the electronic Medicines Compendium gives the exact permitted duration rather than an estimate.

If you are newly starting treatment, reading about how Wegovy works alongside these practical rules tends to make adherence easier because you understand what the medicine is actually doing. Context helps. On the side of caution, there is a separate page covering the side effects that can follow a missed Wegovy dose if you are concerned about what to expect when you resume.

When to speak to your prescriber rather than manage this yourself

The five-day rule handles the straightforward scenario. Contact your prescriber before resuming if you have missed two or more consecutive injections, if you have been unwell with vomiting or diarrhoea during the missed period (dehydration changes the picture), or if you are unsure whether another medicine you take might be affected by restarting. The detailed missed-dose decision guide steps through more complex situations where timing or health context makes the standard rule harder to apply.

A prescriber's review before you continue is also the right call if you are considering changing your injection day permanently rather than as a one-off correction. Adjusting the schedule is possible, but needs to be done with the five-day minimum gap in mind, and it is worth confirming that approach with your clinical team rather than working it out alone.

At nume, every repeat order is reviewed by a GPhC-registered prescriber before it is dispensed, so questions like this come up in the natural course of ongoing care rather than as an afterthought. If you are not yet a patient and would like clinically supervised access to Wegovy, you can speak to our prescribers through a free consultation. Details of what treatment involves, including the clinical review at each stage, are on our weight-loss treatments overview.