How long can you use semaglutide, and what decides that?

The NHS two-year limit: what it means and why it exists

NICE's appraisal of semaglutide for weight management (Technology Appraisal TA875) recommends it for a maximum of two years, and only within a specialist weight management service with multidisciplinary support. That isn't a safety cutoff: it reflects the evidence base available when the appraisal was conducted and the NHS's framework for commissioning ongoing treatment. The real-world implication is that NHS patients reaching the two-year mark face a structured conversation about what comes next, whether that is stepping down with lifestyle support, or exploring other options.

Private prescribing sits outside TA875's two-year fence. A GPhC-registered independent prescriber working in a regulated private service can continue treatment beyond two years if it remains clinically appropriate, and "clinically appropriate" means regular, documented review rather than automatic renewal. A prescriber's job is to revisit the question at each repeat, not to rubber-stamp the previous decision. That distinction matters.

If you are weighing up how long semaglutide typically takes to work and how long a course might last, that gives useful context on when the main effects typically emerge.

The six-month check: the point where most decisions are made

Both NICE and clinical best practice set a clear milestone at six months on the maintenance dose. If weight loss is less than 5% at that stage, the guidance points toward stopping. This isn't arbitrary, the trial data, including the STEP 1 study published in the New England Journal of Medicine, showed an average reduction of around 15% over 68 weeks in adults who responded, but a meaningful minority saw limited benefit. The six-month review is the mechanism for identifying those people early and redirecting them.

For people who do respond well, the six-month mark is also where the conversation shifts from "is this working" to "how long should we keep going." Progress, tolerability, any side effects that have emerged, and your weight-related health conditions all feed into that assessment. There is no single right answer; there is a right clinical process.

One practical question our prescribers hear regularly: what happens when you stop? Weight often returns, sometimes substantially, because the appetite-regulation effects of semaglutide are not permanent. If you want to understand how long you can take semaglutide and what governs that decision, it is important to think about planning for the long term, not just calculating an end date.

What else shapes the duration decision

Beyond the two-year NHS cap and the six-month checkpoint, several other factors influence how long any individual uses semaglutide. Tolerability is one: some people experience persistent gastrointestinal side effects (nausea, changes in bowel habit, reflux) that make continuing at the maintenance dose difficult. A prescriber may adjust the dose or recommend pausing; if side effects are severe or ongoing, stopping may be the right call. NHS England's guidance on weight management injections covers the clinical signals worth discussing with your team.

Pregnancy, breastfeeding and trying to conceive are absolute reasons to stop, semaglutide is not recommended in any of those situations, and the timing of any washout period before conception should be discussed with a prescriber well in advance. The same applies to anyone whose health changes significantly during treatment: new diagnoses, new medicines, or surgery all warrant a fresh clinical look.

One detail that sometimes catches people off guard is how long you can keep semaglutide and what its storage requirements mean in practice, which matters for anyone managing treatment over months or years rather than a single short course. Storage conditions remain the same throughout.

Duration as a decision, not a default

The most useful framing here is that duration is not a fixed answer waiting to be looked up; it is a decision made between you and a prescriber, revisited at regular intervals. The licensed indication, the evidence from trials, NICE's appraisal, your own six-month progress, and your ongoing health picture all feed in. If you are further along in treatment and wondering how long you can be on semaglutide before a review is needed, the answer depends on a service that reviews every repeat clinically, not just at the start.

At nume, every repeat order is reviewed by a GPhC-registered independent prescriber before dispatch, with no auto-renewals. If you want to understand your eligibility and what a clinical review actually involves, checking your eligibility through a free consultation is the starting point. Broader context on the treatment itself is on the Wegovy information page, and if you have a specific question outside a consultation, the FAQs cover the most common ones.