When to Start Wegovy: Timing, Readiness and the First Few Weeks

You've got the pen in the fridge, here's what happens on day one

The scenario is familiar to our prescribers: a patient receives their Wegovy kit, unpacks it carefully, and then waits. Sometimes for days. Often because they're hoping to start on a 'clean' Monday, or after a holiday, or once a stressful work period passes. That hesitation is understandable. It's also, in most cases, unnecessary.

Wegovy's starting dose of 0.25 mg is a tolerability step, not a therapeutic one. Its job is to introduce semaglutide to your system gently, reducing the chance of nausea and other gastrointestinal side effects that tend to be most noticeable in the first days after each new dose. You don't need to clear your diary. Most people go about their week normally. The practical process of taking your first Wegovy dose is straightforward once you know what to expect.

The one genuine timing consideration on day one: pick a day of the week you can repeat consistently. Wegovy is once weekly, and your prescriber will titrate your dose in roughly four-week steps, 0.25 mg, then 0.5 mg, 1.0 mg, 1.7 mg, and up to 2.4 mg at maintenance. Keeping the same weekday each week makes the routine stick. That's the kind of practical detail that sounds small and turns out to matter.

Your pen arrives tracked, in plain packaging, you'll get a DPD notification before it lands. Store it in the fridge door. Inject once a week, rotating between your abdomen, thigh or upper arm. The Patient Information Leaflet that comes with your pen covers storage windows and injection steps precisely; the NHS semaglutide medicines page is a reliable companion reference.

When starting Wegovy should be delayed, and how to tell the difference

There are real reasons to pause before beginning, and the list is shorter than anxiety might suggest. Surgery is the clearest one. NHS England advises telling your surgical team and anaesthetist that you are taking a GLP-1 medicine before any procedure, because slowed gastric emptying affects anaesthetic risk. If you have an operation planned within a few weeks, discuss the timing with your prescriber before you inject that first dose.

Active illness (a stomach bug, a significant infection, anything causing vomiting or diarrhoea) is another reason to wait a few days. Starting while your gut is already unsettled tends to make GI side effects worse than they need to be, and dehydration risk increases.

Pregnancy, trying to conceive, and breastfeeding are firm contraindications: Wegovy is not licensed for use in these situations, and your prescriber will not approve it if any of these apply. If your circumstances change after starting, stop the medicine and contact your prescriber promptly.

Beyond those genuine pause points, timing is mostly a confidence question rather than a clinical one. Waiting for the 'right moment' often means waiting for a moment that never quite arrives. If your prescription is approved and you have no upcoming surgery or active illness, there is no medical reason to delay. The question of when you personally should start Wegovy is worth discussing with a prescriber if anything specific is making you hesitate.

How soon Wegovy starts working, and why the first month looks different from month six

This is probably the question patients ask most in the first fortnight. The honest answer is that 'working' means different things at different stages. Appetite suppression (feeling fuller sooner, thinking about food less) often starts within the first one to four weeks, even at the low starter dose. That early signal is real, even when the scale hasn't moved much yet.

Visible weight loss tends to follow a curve. In the STEP 1 trial, which followed 1,961 adults over 68 weeks on semaglutide 2.4 mg, participants lost an average of around 15% of body weight, but that figure reflects the full treatment period, including months at the higher maintenance doses, not the first few weeks at 0.25 mg. The early phase is about tolerability and building the dose. When Wegovy starts to work in meaningful terms is typically two to four months in, once you've reached or approached maintenance dose, though individual responses vary.

Side effects, when they occur, are most common after each dose increase and usually settle within a week or two. Nausea is the most frequently reported. Eating smaller meals, avoiding rich or fatty foods around injection time, and staying hydrated all help. If side effects feel unmanageable, that's a conversation for your prescriber, not a reason to push through alone. More detail on Wegovy's clinical profile covers the full side-effect picture, and if something feels serious, the MHRA's Yellow Card scheme is where suspected reactions should be reported.

For a broader sense of when weight loss typically begins on Wegovy, the short version is: give it at least twelve weeks before drawing conclusions about whether it's working for you. Bodies respond at different rates, and clinical evidence supports patience at this stage.

Starting Wegovy through a private prescription service

Wegovy is available on the NHS through specialist weight management services under NICE guidance, but waiting lists are long and eligibility criteria are strict. Many people who meet the private prescription criteria (BMI 30 or above, or 27 with a qualifying condition) choose to start through a regulated online pharmacy rather than wait.

If that route appeals, understanding what Wegovy costs privately is a sensible first step, alongside checking that any pharmacy you use is registered with the GPhC. The register is publicly searchable at pharmacyregulation.org. At nume, every consultation is read by a GPhC-registered Independent Prescriber, a named clinician, not software. Orders placed before 12pm on working days are dispatched the same day once approved, with free next-working-day tracked delivery. No subscription, no hidden fees. If you'd like to start your free consultation, the process takes a few minutes and is reviewed the same day.