Can anyone take semaglutide for weight loss — and should you?

Starting point: what the licence actually says

The UK licence for Wegovy, as described by the NHS, covers adults who meet one of two thresholds. A BMI of 30 or above qualifies on its own. A BMI of 27 to 29.9 qualifies if you also have at least one weight-related condition — common examples include hypertension, raised cholesterol, type 2 diabetes, obstructive sleep apnoea and osteoarthritis. For some ethnic backgrounds, UK guidance applies BMI thresholds that are 2.5 kg/m² lower, recognising that cardiometabolic risk differs across populations.

Meeting those numbers is the opening question, not the closing one. A prescriber then considers your full health history, current medicines, and any conditions that might make treatment unsuitable or require extra care. Who can use Wegovy covers the eligibility picture in more detail if you want to go deeper on the criteria before a consultation.

One thing worth saying plainly: BMI thresholds are a starting filter, not a guarantee. Two people with the same BMI can have very different clinical situations. The assessment exists precisely because of that.

Conditions and circumstances that rule semaglutide out

Several situations mean semaglutide is not appropriate, and a thorough prescriber will ask about all of them. A personal or family history of medullary thyroid carcinoma (a specific type of thyroid cancer) or of multiple endocrine neoplasia syndrome type 2 (MEN2) is a contraindication, meaning semaglutide should not be used. Severe kidney or liver disease, a history of pancreatitis, and certain serious gastrointestinal conditions also require careful prescriber discussion and may make treatment unsuitable.

Pregnancy is a clear exclusion. Semaglutide is not recommended for anyone who is pregnant, breastfeeding, or actively trying to conceive; women of childbearing age are advised to use reliable contraception while on treatment. The medicine is also not licensed for use under the age of 18.

If you take other medicines, interactions matter too. The slowing of gastric emptying that makes semaglutide effective at reducing appetite can affect how other oral medicines are absorbed. Women using the contraceptive pill should discuss this with their prescriber, since NHS England's guidance on weight-management injections flags this as something to plan for. An additional non-oral contraceptive method is sensible precaution.

The question you're really asking: is it right for you specifically?

Much of the uncertainty people have isn't about the general criteria, it's about their own situation. Perhaps you're close to the BMI threshold. Perhaps you have a health condition that feels borderline. Perhaps you've read something about semaglutide and testosterone and want to understand whether that affects your decision. These are exactly the questions a prescriber works through, not ones a checklist resolves.

It's also worth thinking honestly about whether the timing works for you. Someone who travels frequently, or whose schedule makes regular injection days hard to plan around, will have a different conversation about adherence than someone who keeps a fixed weekly routine. Consistency matters for results, and a prescriber who knows your life can help you think that through, including whether a Monday delivery (ordered by 12pm) or a particular week around a holiday creates a gap worth planning for.

If you're curious what happens when semaglutide doesn't produce the expected results, this question gets answered honestly by our clinical team. Not everyone responds identically, and that's part of what makes prescriber support throughout treatment valuable rather than optional.

Private and NHS routes: the eligibility gap

NICE recommends semaglutide on the NHS (under technology appraisal TA875) only within specialist weight management services, and only for adults with a BMI of 35 or above alongside at least one comorbidity, for a maximum of two years. The waiting lists for those services are long in most parts of England, and NHS criteria are more restrictive than the product's licensed thresholds.

Private prescribing follows the licensed criteria (the BMI 30, or 27-plus-condition, thresholds) without the NHS's additional specialist-service requirement. That creates a meaningful gap: people who are clinically eligible for a prescription but don't meet NHS NICE criteria, or who'd rather not wait, can access semaglutide privately if a prescriber confirms suitability. Getting Wegovy privately explains what that process involves practically. You can also see how online prescribing works from a safety and regulatory standpoint, particularly useful if you've never used an online pharmacy before.

At nume, every consultation is read by a GPhC-registered prescriber, not software. If you're unsure whether your situation fits, checking your eligibility through a free consultation is the clearest way to find out.