Can you adjust the dose on a Wegovy pen — and who decides when to change it?

The pen itself: fixed by design, not adjustable

This is the question our prescribers field most weeks, and the answer is simpler than most people expect. Wegovy pens are single-use, pre-filled, and set at the factory. There is no mechanism for a patient to alter the dose, no dial, no plunger adjustment, no partial injection technique that is clinically reliable or safe. When you press the button, the full pre-set dose is delivered. That is by design.

The practical consequence is that dose changes happen at the product level: your prescriber moves you to a pen of the next strength. The individual pen strengths in the schedule are 0.25 mg, 0.5 mg, 1.0 mg, 1.7 mg, and 2.4 mg, each a distinct product. Some people ask about the newer 7.2 mg option; that higher dose, approved by the MHRA in January 2026 and available as a dedicated single-dose pen since April 2026, also comes as a fixed-dose device.

What actually arrives through your door, once a prescriber approves a step up, is a new pen. It comes from our GPhC-registered pharmacy in plain, unbranded packaging via DPD tracked delivery, the strength printed clearly on the label, everything you need included. Nothing ambiguous, nothing to adjust.

Why dose changes are a prescriber's call, not the patient's

The titration schedule exists for a reason. Starting at 0.25 mg gives your system time to adapt, the gastrointestinal effects of semaglutide (nausea, reflux, loose stools in some people) are generally most noticeable in the early weeks and tend to ease as the body adjusts. Rushing to a higher dose doesn't speed up weight loss in any reliable way; it mainly increases the chance of side effects that make treatment harder to sustain.

Under the standard schedule, roughly four weeks pass at each strength before moving to the next. But that figure is a minimum, not a rule. A prescriber may recommend staying at a given dose for longer if tolerance is still settling, or if there's a reason to hold before a dose increase. The therapeutic maintenance dose for most people is 2.4 mg weekly, but reaching it can take five months or more. Some patients stay below it long-term. That's a clinical judgement, made with the full picture.

The NHS guidance on weight-management injections is clear that these medicines sit within a framework of clinical oversight, which is one reason the NHS England resource on weight-management injections emphasises the role of healthcare professionals throughout treatment, not just at the start.

What to do if the current dose isn't working, or isn't tolerable

This is where the decision-making really sits. There are two directions a dose might need to move: up, because weight loss has plateaued and tolerance is good; or back, because side effects at the current strength are making daily life difficult. Neither is something to handle alone.

If you're on a lower dose and wondering whether it's doing anything, it is worth knowing that some weight loss does occur at sub-maintenance doses for many people, though the results at 0.5 mg, for example, are typically more modest than at 2.4 mg. The STEP 1 trial, published in the New England Journal of Medicine, established the 2.4 mg weekly dose as the level associated with around 15% average weight reduction over 68 weeks, lower doses were not tested as maintenance in that trial, but clinical experience and tolerability data inform prescribing practice.

If side effects are the issue, reducing to a previous strength or pausing the titration is legitimate and sometimes necessary. What isn't advisable is attempting to inject a partial dose from a fixed pen, or skipping injections without telling your prescriber. The NHS medicines guidance on semaglutide directs patients to the Patient Information Leaflet and their healthcare team for missed-dose and titration queries, and that guidance stands regardless of whether you're accessing treatment through the NHS or privately.

At nume, every repeat order goes through a named clinical reviewer before dispatch. If something has changed (side effects, weight trajectory, another medicine you've started) that review is when to raise it. There's no extra form; it's part of how the process works. If cost is part of the picture when you're thinking about dosing decisions, the wegovy cost page covers what different doses and supply routes typically involve.