How Wegovy dosing for weight loss actually works

Why does Wegovy start at such a low dose?

Most people asking about Wegovy dosing for weight loss are surprised by how cautiously the schedule begins. The 0.25 mg starting dose is not a therapeutic target. Its purpose is adjustment: semaglutide slows gastric emptying and influences appetite signals in the brain, and introducing that change gradually keeps nausea, vomiting and digestive discomfort manageable. Many people barely feel 0.25 mg at all, and that's the point.

From there, the schedule climbs roughly every four weeks: 0.5 mg, then 1.0 mg, then 1.7 mg. Each rung adds a little more of the medicine's appetite-regulating effect. By the time a patient reaches 2.4 mg (the standard maintenance dose) their system has had around sixteen weeks to adapt. Our guide to Wegovy dosing sets out this titration pathway in detail, and it's worth reading if you want the clinical language alongside a plain-English summary.

What your prescriber is watching across those weeks is tolerability. If GI symptoms are pronounced at a particular dose, the standard approach is to hold at that level a little longer before stepping up, rather than pushing through. Titration timing is always a clinical decision; your prescriber and the Patient Information Leaflet are the right places to confirm what applies to you specifically.

What happens at the 2.4 mg maintenance stage, and is that always the end point?

For most people on Wegovy, 2.4 mg once weekly is where the main weight-loss phase happens. The STEP 1 trial (a 68-week, placebo-controlled study published in the New England Journal of Medicine) found an average body-weight reduction of around 15% at 2.4 mg alongside lifestyle changes. That's a meaningful result, though individual outcomes vary considerably and the trial enrolled adults with obesity or overweight with a weight-related condition.

Until April 2026, 2.4 mg was the ceiling. Then the MHRA approved a 7.2 mg maintenance dose, a significant step. You can read the full picture on Wegovy and weight loss outcomes to see where that higher dose sits in the evidence. In brief: trials at 7.2 mg reported around 20.7% average weight loss over 72 weeks, narrowing the gap with tirzepatide's results at its highest dose. The 7.2 mg pen was initially supplied as three separate 2.4 mg injections per week, but the MHRA approved a purpose-built single-dose 7.2 mg pen on 14 April 2026, one weekly injection, auto-dosing mechanism, covered needle that locks after use. Whether that dose is appropriate for a given patient is still a prescriber's call, not a patient upgrade request.

NICE's recommendation for semaglutide, published as technology appraisal TA875, covers Wegovy for adults with a BMI of 35 or above and at least one weight-related condition, used for a maximum of two years within a specialist weight management service. Private prescribing follows the licensed SmPC criteria rather than NICE's NHS commissioning conditions, but eligibility is still assessed individually.

What should you expect when the pen actually arrives?

This is a question our prescribers hear regularly, and it's a reasonable one. If you're prescribed Wegovy through a regulated UK online pharmacy, the pen arrives in plain, unbranded packaging via tracked courier, the DPD notification lands on your phone before the box reaches your door. Inside, you'll find a pre-filled pen, a Patient Information Leaflet, and (depending on the pen format) separate needles. Read the leaflet before your first injection; it covers the injection technique, rotation of sites between abdomen, thigh and upper arm, and the storage rules.

Storage matters for semaglutide. The pen must be kept refrigerated at 2–8°C before first use. After that, a limited room-temperature window applies, the exact duration is in the SmPC and the leaflet, and you should follow that rather than any number quoted online. The Mounjaro SmPC and the equivalent Wegovy document are both accessible on the Electronic Medicines Compendium if you want the prescribing information in full.

If you're comparing the injection schedule with alternatives, a semaglutide dosing chart lays out the timeline visually and is worth bookmarking alongside this page.

Who can prescribe Wegovy, and what does clinical review actually involve?

Wegovy is a prescription-only medicine. The licensed criteria are adults with a BMI of 30 or above, or 27–29.9 with at least one weight-related condition such as hypertension, raised cholesterol, type 2 diabetes or obstructive sleep apnoea. BMI thresholds are 2.5 kg/m² lower for some ethnic backgrounds under UK guidance. Meeting those numbers is the starting point, not the whole picture, contraindications, current medicines, and medical history all feed into the prescriber's decision.

At a regulated UK online pharmacy, that review involves a clinical consultation, identity verification, and weight verification. None of it is algorithmic: a named, GPhC-registered Independent Prescriber reads your answers. Repeat orders go through the same process; dose increases require evidence review. The semaglutide overview page covers eligibility in more depth, and if you want to understand how the private route compares to NHS access, the weight loss treatments overview explains both honestly.

Side effects to know about before starting: the most common are gastrointestinal, nausea, loose stools, constipation, indigestion, burping. These tend to be most noticeable in the first days after a dose increase and often ease within a week or two. Seek urgent medical help for severe, persistent stomach pain that radiates to the back, which can be a sign of pancreatitis; the MHRA highlighted this in a Drug Safety Update in January 2026. Any suspected side effect can be reported at yellowcard.mhra.gov.uk. Wegovy is not recommended during pregnancy, while breastfeeding, or when trying to conceive, and it is not licensed for under-18s.

If the dosing schedule has answered your questions and you'd like to understand more about what losing weight on Wegovy typically looks like before a prescriber assesses your suitability, you can start with a free consultation through our weight loss treatments page.