Missed One Week of Wegovy — Here Is What to Do

The myth: missing a week means starting over

The most common worry our prescribers hear is that a single missed injection wipes out progress and forces a return to the starter dose. In practice, that is not how semaglutide works. One week without a dose does not clear the medicine from your system, semaglutide has a half-life of roughly a week, meaning meaningful plasma levels persist beyond the injection window. Your body is not starting from scratch after a single gap.

What can happen is a temporary return of appetite or a brief wave of nausea when you resume. That is normal. It does not signal treatment failure, and it does not automatically mean your prescriber needs to adjust your dose. The NHS semaglutide medicines page confirms the two-day rule and notes that you should not take two injections to make up for a missed one.

So the facts, plainly: one week missed, resume at your usual dose using the two-day rule, carry on. If you want a closer look at exactly what to do in that situation, our guide on what happens when you miss a week of Wegovy walks through the steps in full. The worry is understandable; the clinical picture is less dramatic than it feels.

What the two-day rule looks like in practice

Your injections follow a fixed day each week, say, every Monday. You forget one Monday and notice on Wednesday. Two days have passed, and your next scheduled dose is still five days away, so you are safely within the window to inject that day. Note it in your calendar, then resume your normal Monday schedule the following week.

If you only notice on Sunday (one day before your next due Monday injection) skip the missed dose entirely and inject as planned on Monday. Taking two injections that close together is not worth the added nausea or gastrointestinal discomfort, and it does not improve outcomes. A quick check of the date on your pen box takes under a minute and confirms how long the gap actually is before you make a decision.

For a fuller breakdown of the weekly dose schedule and what each strength involves, the Wegovy doses guide covers the titration steps from 0.25 mg through to maintenance.

Side effects after resuming, what to expect

After any gap in a GLP-1 medicine, gastrointestinal side effects can flare briefly. Nausea, loose stools, or a feeling of fullness that is more pronounced than usual in the first day or two after resuming are all recognised patterns. They usually settle within a few days as your body readjusts.

The side-effect profile of semaglutide is broadly GI-led: nausea, vomiting, diarrhoea, constipation, and indigestion are the most reported. None of these are reasons to panic after a one-week gap, but they are worth knowing about so you are not caught off-guard. Eating smaller portions and avoiding fatty or very spicy food in the 24 hours after restarting tends to help.

Rare but serious symptoms (severe, persistent stomach pain that moves into your back, with or without vomiting) warrant urgent medical attention. The MHRA flagged acute pancreatitis as a known, infrequent risk of GLP-1 medicines in a Drug Safety Update published in January 2026. That risk is not specific to a missed dose, but it is always worth knowing the warning sign.

When a one-week gap needs a prescriber's input

Most people who miss a single week need nothing more than the two-day rule and a reset of their weekly schedule. A prescriber's input becomes relevant in a few specific situations: you are unsure whether your gap is one week or longer; you experience symptoms after resuming that concern you; or your treatment was interrupted during a dose increase and you are not certain whether to continue at the new strength or step back.

If the gap has stretched past two weeks, the clinical picture shifts. You can read about what to do after missing two weeks of Wegovy separately, and there is further detail on gaps of three weeks or more for anyone who has been away from treatment longer. For situations where you have missed two doses of Wegovy in a row, there is dedicated guidance on how to approach restarting safely. For general missed-dose questions that do not fit neatly into a time window, the Wegovy missed dose page gives an overview of the full guidance.

Wegovy is a prescription-only medicine and every repeat order at nume goes through a clinical review before dispatch, so if you have concerns when your next supply is due, raise them then. Or, if something feels pressing now, contact our aftercare team, who are available seven days a week. If you are thinking about starting treatment rather than managing a gap, a free consultation with our prescribers is the place to begin.