What to do when you miss a Wegovy dose: clear instructions

It's Tuesday evening and you've just realised you forgot Sunday's injection

This scenario comes up more often than you might expect, and the answer is reassuringly straightforward. Sunday to Tuesday is two days, which means your next scheduled Sunday injection is still five days away. In this case you can give the injection now, on Tuesday evening, then return to Sundays as planned. Nothing about your regular day changes.

The situation shifts if you remember on Friday. With only two days until your next Sunday dose, injecting now would put two doses within five days of each other, and that is specifically what the guidance says to avoid. The right move is to let the missed dose go, inject on Sunday as usual, and carry on.

That five-day gap matters because semaglutide stays active in the body for a week or more. Stacking doses too closely does not speed up results; it significantly increases the likelihood of nausea, vomiting and other gastrointestinal discomfort. The NHS patient information for semaglutide is clear on this point, and it mirrors the wording in the Patient Information Leaflet that comes with every pen.

If you are new to Wegovy and finding the starting-dose period harder to keep track of, setting a phone alarm for the same time each week removes most of the guesswork. Same day, same time, somewhere it interrupts your routine.

What actually happens to your weight loss if you miss a dose

A single missed injection is unlikely to undo your progress. Semaglutide's long half-life means therapeutic levels do not collapse overnight. Most people notice a gradual return of appetite in the days following a missed dose rather than an abrupt change, which is your body's signal that the medicine is wearing off rather than anything more alarming.

Missing two or more consecutive doses is a different matter. If you have missed two weeks running, read the specific guidance on what to do after missing two Wegovy doses before injecting again, because the advice differs. Your prescriber may also want to know, particularly if you are at a higher dose, returning to a maintenance dose after an extended gap without clinical input carries more risk of side effects than gradual titration did first time around.

One thing worth understanding: Wegovy is a long-term treatment. The clinical trials that established its effectiveness (including STEP 1, published in the New England Journal of Medicine) ran for 68 weeks with consistent weekly injections. The results reflect sustained, regular use. Intermittent dosing produces intermittent results.

If cost is making consistent use difficult, it is worth looking honestly at what Wegovy costs privately in the UK and what different services include, so you can plan properly rather than skip doses silently.

What to do if you keep forgetting, or if something else is going on

One missed dose is a practical matter. A pattern of missed doses usually points to something more, the injection feeling uncomfortable, nausea making you reluctant to dose, or life simply getting in the way. All of these are worth talking through, not working around quietly.

If nausea is the reason you are avoiding your injection, your prescriber needs to know. Staying on a dose that is making you miserable is not the plan; the titration schedule built into Wegovy (detailed in the full Wegovy dosing instructions) exists precisely because tolerance varies. A prescriber can discuss whether a slower step-up or a temporary hold is appropriate for you.

If you use a four-dose pen and are partway through it, the Wegovy four-dose pen guidance explains exactly how to pick up mid-pen after a gap, including storage requirements to check. Pens need to stay refrigerated between 2°C and 8°C; anything outside that range, or a pen that has been at room temperature beyond the window stated in the Patient Information Leaflet, should not be used without checking the leaflet first.

The broader guide to Wegovy's dose strengths covers how each step in the schedule works and what your prescriber is looking for before any increase. That context makes it easier to have an honest conversation when something is not going to plan.

If you have questions about your treatment and would like a prescriber to review your situation, you can speak to our prescribers, a real clinician reads your case the same day, not software.