How many clicks are in the Wegovy 0.5 mg pen?

What the click actually does, and why the pen is designed this way

When you press the injection button on a Wegovy pen, a single pre-measured dose is delivered automatically. There's no dial to set and no way to vary the amount. For the 0.5 mg pen, that fixed amount is 0.5 mg of semaglutide every time, and the pen holds precisely four of those doses.

The one-click, one-dose design exists to reduce the chance of over- or under-dosing, which matters for a medicine working on appetite signals over weeks. You'll hear or feel a click as the injection completes, that's the confirmation the full dose has gone in, not a signal to keep pressing. Novo Nordisk's Patient Information Leaflet, available on the electronic Medicines Compendium (eMC), has step-by-step injection guidance including what to look for if you're unsure the click registered properly.

Practically speaking, many people find it easiest to mark the day on a calendar or use the date labels printed on the pen after each injection. That way, even a busy week (the kind where Thursday blurs into Friday) doesn't leave you guessing whether you've already used that week's dose.

Counting your remaining doses: the decision most readers are actually trying to make

If you've picked up this page mid-treatment, the real question is probably: do I have enough left in this pen? Here's how to work it out. A new, unused 0.5 mg pen has four doses. Subtract one for each week you've already injected. The pen has no window or gauge to show how much liquid remains, the only reliable method is counting the injections you've given from it.

The pen locks after the fourth dose and cannot deliver a fifth, so you won't accidentally take extra. But it also means you can't save the pen for later and top it up. If you're running low and wondering about getting your next pen, our page on how many doses are in one Wegovy pen covers this for all strengths in the titration pathway.

One thing worth knowing: the 0.5 mg pen is a titration step, not the maintenance dose. If you're curious about how many mg are in each Wegovy pen across the full range of strengths, that page breaks it down clearly for every step in the schedule. Don't adjust the schedule yourself, if you feel ready to move up, raise it at your next clinical review.

What happens when the pen is empty, and how to dispose of it

An empty Wegovy pen goes into a sharps bin, not into your household recycling or a general waste bag. Used pens have a retracted needle tip and residual medicine; they're clinical waste. Most community pharmacies accept them, or you can use a home sharps collection service arranged through your local council. A fifth dose cannot be extracted from the pen, the locking mechanism prevents it, so there's no need to try.

Once disposed of, the next step is confirming your follow-on supply before the gap widens. If you're on a private prescription, your prescribing service should review you before each new pen. At nume, sorry, at our pharmacy, every repeat order is clinically re-reviewed before dispatch; there are no automatic renewals. Our clinical team, including our lead prescriber, checks that the current dose still makes sense before anything is sent out.

If you're still deciding between Wegovy and other licensed treatments, the weight-loss treatment overview sets out what's currently available through private prescription in the UK. Semaglutide pricing context sits on a separate page, look for the cost section in our full Wegovy guide if that's helpful at this stage.

When to contact your prescriber rather than counting clicks

Counting clicks tells you where you are in the pen. It doesn't replace clinical judgement about whether the dose is working for you, whether side effects need attention, or whether your titration timing is right. A few situations where reaching out makes more sense than self-managing: the pen clicked but you're not sure the injection completed fully; you missed a dose and it's been more than five days since it was due; you're experiencing nausea or GI symptoms that aren't settling after the first week or two on this dose; or you're wondering whether your weight response suggests moving to the next strength sooner or later than planned. Our guides covering how many clicks are in the 1 mg Wegovy pen and how many clicks are in the 2.4 mg Wegovy pen can help you stay oriented as you progress through the titration steps.

For anything urgent (severe stomach pain that spreads to your back, signs of an allergic reaction, or symptoms that feel serious) get medical help promptly rather than waiting for a scheduled review. You can also report any suspected side effects through the MHRA Yellow Card scheme, which helps regulators monitor how medicines perform in practice. For non-urgent questions about your pen or your treatment plan, our aftercare team is available seven days a week.