I didn't feel my Wegovy shot — does that mean it didn't work?

The myth worth clearing up first: pain equals proof

Somewhere the idea took hold that a medical injection should sting, click audibly, or leave a mark, and that if it didn't, something went wrong. With Wegovy, the opposite is closer to the truth. The pen uses a very thin, short needle specifically engineered to reach subcutaneous tissue with minimal discomfort. A completely painless injection is a sign of good technique, not a missed dose. The feelings people notice after their first Wegovy shot are almost always delayed systemic effects (mild nausea, reduced hunger) not anything they experienced in the moment of injecting.

Subcutaneous fat contains relatively few nociceptors compared with dermis or muscle. That is by design: insulin pens, low-molecular-weight heparins and GLP-1 medicines all target this layer precisely because it is tolerable and absorbs medicines reliably. So if your arm, thigh or abdomen felt like nothing happened, that is the result the manufacturer was aiming for.

How to confirm the dose actually went in

Because sensation is an unreliable guide, Wegovy pens include visual confirmation. After you press the injection button and hold the pen against your skin for the full recommended time, a yellow bar or plunger moves through the viewing window on the pen body. When that indicator has fully moved, the dose is complete. If you have ever peered at your pen afterwards and found yourself uncertain, our guide to the Wegovy yellow bar explains exactly what each stage of that window should show.

Equally important is hold time. Pulling the pen away too early (before the yellow bar finishes its travel) is the most common cause of a partial or missed dose. The leaflet that comes with your pen specifies the duration; following it takes precedence over any general advice. Injection site also plays a role: abdomen, outer thigh, and upper arm are all licensed sites, and rotating between them prevents localised skin changes that can affect absorption over time.

If you are genuinely unsure whether a specific injection went in, the question of whether your Wegovy shot went in is covered in detail elsewhere, including what to do if you suspect a missed dose.

What you should (and shouldn't) feel in the days that follow

The pharmacological effects of semaglutide build over hours, not moments. According to NHS guidance on semaglutide, the most commonly reported early effects are gastrointestinal: nausea, constipation, or loose stools, particularly in the first few weeks at a new dose level. Reduced appetite typically becomes noticeable within a day or two of each weekly injection. Neither of these confirms the physical act of injecting went perfectly, but their consistent presence week to week is a reasonable signal that semaglutide is reaching your system.

If weeks pass without any change in appetite or without any of the mild side effects that are common early on, that conversation belongs with your prescriber. Timing your injection consistently helps too; choosing a regular day and time for your Wegovy shot keeps blood levels more stable than injecting at unpredictable intervals. And if you want to understand the broader picture of how Wegovy tends to feel over the weeks of treatment, that varies considerably between individuals and is worth reading about before drawing conclusions from any single injection.

One practical note: when your pen arrives from our pharmacy in plain, unbranded packaging via DPD, the outer box will contain a Patient Information Leaflet. Reading the injection-technique section there (not just the quick-start guide) is genuinely worth the five minutes it takes.

When to raise it with a prescriber rather than reassure yourself

Most people who didn't feel their Wegovy shot need no action beyond adjusting technique. A few situations warrant a proper clinical conversation. If you notice liquid on your skin after the injection, if the pen's viewing window did not fully change, or if you experience none of the expected appetite changes over several weeks despite consistent injections, speak to a prescriber. Similarly, if you are experiencing side effects that feel disproportionate (or none at all when you expected some) that pattern is worth discussing. You can read about the range of experiences people have on Wegovy to calibrate what typical looks like.

The MHRA's Yellow Card scheme at yellowcard.mhra.gov.uk is there if you ever want to report an unexpected device issue, such as a pen that appeared not to fire correctly. It is not just for side effects, device problems count too.

Wegovy is a prescription-only medicine; a prescriber needs to assess suitability before anyone starts or adjusts treatment. If you have questions about your current treatment or are exploring weight-loss treatment options for the first time, our prescribers are available to review your situation. Speak to our prescribers through a free consultation, no waiting list, reviewed the same day by a real clinician.