Accidentally Took Two Doses of Wegovy — What Happens Now?

What does a second dose of Wegovy actually do to your body?

Semaglutide works by binding to GLP-1 receptors, slowing gastric emptying and reducing appetite. The medicine has a long half-life (around a week) which is why once-weekly dosing works so well. When an extra injection goes in before the previous one has cleared, the concentration of semaglutide in your bloodstream rises higher than intended. Your body isn't in danger in the way you might fear, but it is getting a bigger signal than the prescriber planned for.

The practical effect, for most people, is an amplified version of what you may already experience around injection day. Nausea tends to be the first thing that arrives and the most noticeable. Diarrhoea, indigestion, burping, and a sharp drop in appetite often follow. These are uncomfortable but not, for the majority of people, medically serious. They usually settle within 24 to 48 hours as your body processes the excess.

There is a common misconception that accidentally doubling up will somehow accelerate weight loss or "use up" the extra dose productively. It doesn't work that way. The appetite-reducing effect is already near its ceiling on your prescribed dose; taking more doesn't stack the benefit, it just adds unwanted side-effect burden. If you are concerned about what happens when you have taken too high a dose of Wegovy, our dedicated page walks through what to expect and when to seek help. The extra semaglutide is processed and cleared in the same way as any other dose.

If you are unsure which pen you are on or what your current schedule looks like, the Wegovy dose guide on this site sets out the standard titration pathway clearly.

Should you skip next week's injection to even things out?

This is one of the most frequently asked questions after a double-dose mishap, and the answer from clinical guidance is consistent: no, do not skip your next injection. Deliberately missing a scheduled dose to compensate creates a different problem (an unplanned gap in your semaglutide levels) which can make side effects at the following dose feel worse, not better.

The correct approach is to return to your normal weekly schedule. If your usual injection day is, say, Monday, you simply take your next dose the following Monday. Nothing changes. The double dose is a one-off event, not a reason to reorganise your whole titration timeline.

If more than two weeks pass without an injection for any reason, the Wegovy pen and dose information page explains that some patients need to restart at a lower dose, but that is a different situation entirely from a single accidental double dose. One extra injection in a week does not require restarting from scratch.

If you missed a dose the previous week and then took two this week because you were trying to make up for it, you may find it helpful to read our guidance on what to do when you have taken the wrong dose of Wegovy, as the steps to follow are explained there in detail. Speak to your prescriber if you are worried about how missed or doubled doses may have affected your progress. Our support team can help you reach the right person quickly.

Which symptoms after a double dose need urgent attention?

Most people who accidentally take two doses of Wegovy will feel rough for a day or so and then recover without incident. But there are specific symptoms that warrant prompt medical attention, and it is worth knowing them clearly.

Severe stomach pain that doesn't ease, particularly if it spreads toward your back, can be a sign of pancreatitis, a known but uncommon risk with GLP-1 medicines. In January 2026, the MHRA updated its guidance on GLP-1 receptor agonists to highlight this specifically: persistent, intense abdominal pain with or without vomiting should be assessed by a doctor the same day, not watched and waited on.

Dehydration is the other concern to take seriously. If vomiting and diarrhoea are persistent rather than passing, you can lose fluids faster than you can replace them, and a double dose can make that more likely. Signs of significant dehydration (dizziness, dark urine, confusion, or feeling faint when you stand up) mean you need medical attention rather than just rest and water.

For anything beyond short-lived nausea and a reduced appetite, do not wait. Call your GP or, outside normal hours, NHS 111. If you are experiencing symptoms you believe are related to your Wegovy treatment more broadly, suspected side effects can also be reported through the MHRA's Yellow Card scheme at yellowcard.mhra.gov.uk.

How can you prevent it happening again?

Accidental double doses almost always come down to one of three things: losing track of which day you last injected, confusing a new pen with a finished one, or injecting in a rush and forgetting you already had. None of these make you careless, the weekly interval is long enough that it genuinely slips minds, especially in busy weeks.

A few practical habits help. Noting your injection day on your phone's calendar with a repeating weekly reminder is simple and effective. Some people write the date on the pen box after each injection. If you use a medicine tracker app, adding Wegovy to it takes about 30 seconds. Keeping used pens separate from new ones (in a sharps container rather than a drawer with unopened stock) also removes the risk of second-guessing whether a pen is spent.

If you are finding the titration schedule confusing or you've had questions about what your normal maintenance dose should look like, that's worth raising with your prescriber directly. A clear conversation about where you are in the titration process, and what the plan looks like from here, prevents a lot of avoidable errors. If you have reached a point where progress has stalled, our overview of what happens when weight loss plateaus on 2.4mg may also be useful background reading.

If you are not yet a patient and are exploring how clinically supervised Wegovy treatment works, you are welcome to speak to our prescribers, there is no obligation and no fee for the consultation itself.