What the Wegovy weight loss programme really involves

What the programme structure actually looks like day to day

Most people who consider the Wegovy weight loss programme do so after months of trying other approaches. That context matters, because Wegovy is not a crash intervention, it is a gradual, months-long process with a structured titration schedule that a prescriber sets out from the start.

The injection begins at 0.25 mg weekly. Over roughly four-month increments, the dose increases through 0.5 mg, 1.0 mg and 1.7 mg, aiming for the 2.4 mg maintenance dose. Each step is designed to let your body adjust, reducing the likelihood of nausea or digestive upset that can occur when the dose moves too quickly. The NHS medicines page for semaglutide outlines the full schedule and what to expect at each stage.

Semaglutide works as a GLP-1 receptor agonist, it mimics a gut hormone involved in appetite signalling and slows how quickly the stomach empties. In practical terms, many people find they feel full earlier and feel less driven to eat between meals. That biological shift is what makes the dietary component of the programme achievable rather than purely willpower-dependent.

For more background on how semaglutide functions as a treatment, the semaglutide overview covers the mechanism in plain language. And if you are weighing Wegovy against other options, the weight loss treatment overview sets out what is currently licensed in the UK.

The eligibility factors a prescriber weighs up

BMI is the headline number, but it is not the whole picture. The licensed threshold is BMI 30 or above for weight management, or BMI 27 or above if you have at least one weight-related condition, such as high blood pressure, raised cholesterol, obstructive sleep apnoea, prediabetes or type 2 diabetes. For some ethnic backgrounds, UK guidance applies thresholds that are 2.5 kg/m² lower, reflecting different metabolic risk profiles.

Beyond BMI, a prescriber considers your medical history: certain conditions, including a personal or family history of medullary thyroid carcinoma, pancreatitis or specific gastrointestinal problems, require careful discussion before Wegovy is appropriate. Pregnancy, breastfeeding and trying to conceive are situations where the medicine is not recommended. It is not licensed for use in under-18s.

NICE's appraisal of semaglutide for weight management (TA875) recommends it within specialist services for eligible adults, and specifies a maximum treatment duration of two years under NHS commissioning. Private prescribing follows the same licensed criteria, a prescriber still assesses your individual picture; the licence does not change because the route is private.

The Wegovy weight loss page covers eligibility in more detail, and the FAQs address common questions about what disqualifies someone from treatment.

Side effects and the honest trade-off

Gastrointestinal effects are the most reported: nausea, loose stools, constipation, indigestion and burping are all common, particularly in the first few weeks after starting or after a dose increase. For most people they are temporary. Fatigue and headaches are also reported.

Less common but more serious effects include gallbladder problems and, importantly, acute pancreatitis. In January 2026, the MHRA issued a Drug Safety Update flagging pancreatitis as a known and potentially serious risk with GLP-1 medicines: if you develop severe stomach pain that extends to your back (with or without vomiting) you should seek urgent medical help and not wait for your next prescriber appointment.

The MHRA's Yellow Card scheme at yellowcard.mhra.gov.uk lets you report any side effect you suspect is related to your treatment. Our clinical team encourages patients to use it, it strengthens the evidence base for everyone.

A word on the injection itself: Wegovy arrives in a pre-filled pen. When ordered through a regulated pharmacy like ours, it comes tracked via DPD in plain, unbranded packaging, nothing that announces what is inside. You inject into your abdomen, thigh or upper arm, rotating the site each week, and store the pen in the fridge. The Patient Information Leaflet inside the box covers storage windows and what to do if a dose is missed, that is the right guide for dose-specific questions, not any website.

If you are curious about the tablet alternative, the oral Wegovy page covers what changed with the June 2026 MHRA approval and how the daily tablet compares practically to the weekly injection.

Getting the programme started: NHS, private, and what to think about first

On the NHS, Wegovy access runs through specialist weight management services and involves waiting lists that in many areas are measured in months. NICE's TA875 recommendation attaches conditions: multidisciplinary support, a two-year duration limit, and specific BMI plus comorbidity thresholds. Meeting the criteria does not guarantee a prompt referral.

Private prescribing through a GPhC-registered pharmacy removes the waiting list. It does not remove the clinical assessment, that is a legal requirement for any prescription-only medicine, and any seller offering semaglutide without one is operating outside the law. Before using any online pharmacy, you can verify its registration at the GPhC register; it takes about thirty seconds and tells you whether the pharmacy is properly licensed.

On cost: private Wegovy programmes vary in price, and headline figures do not always include the consultation, prescription or aftercare. For a breakdown of what legitimate pricing covers, the Wegovy programmes page covers the structure in detail. If cost or access is a concern, it is also worth checking whether you qualify for the Wegovy assistance program, which is designed to help eligible patients manage the expense of treatment. If you are considering buying Wegovy online, understanding what a regulated service includes (and what red flags look like) is worth a few minutes before you commit.

When you are ready to talk to a prescriber about whether this programme fits your situation, start your free consultation and a GPhC-registered prescriber will review your answers the same day.