Why Can't I Get Weight Loss Injections Right Now?

Step 1: Work out whether the barrier is NHS criteria or private eligibility

The first thing to pin down is which door you were trying to open. NHS access to tirzepatide (Mounjaro) and semaglutide (Wegovy) is governed by NHS England's guidance on weight management injections, and the criteria are deliberately narrow at this stage. As of mid-2026, NHS tirzepatide is available to people with a BMI of 40 or above who also have four or more specific conditions from a set list, high blood pressure, dyslipidaemia, obstructive sleep apnoea, cardiovascular disease, or type 2 diabetes. A second cohort (BMI 35–39.9 with the same four-condition requirement) opened in June 2026, and further phases are expected into 2027. Wegovy on the NHS sits within specialist weight management services that carry long waiting lists in most areas.

If you don't meet those thresholds yet, that's the NHS saying not right now, not that the medicines are wrong for you. Private treatment operates under the medicines' licensed criteria, which are broader: BMI 30 or above, or BMI 27 or above alongside at least one weight-related condition such as prediabetes, hypertension, high cholesterol, or obstructive sleep apnoea. Lower BMI thresholds apply for some ethnic backgrounds under UK guidance. You can check the full picture of who can get weight loss injections before going further.

A quick habit worth trying before anything else: use the NHS BMI calculator to confirm your current reading. It takes under a minute and tells you immediately whether you clear the private licence threshold, which is the most common sticking point.

Step 2: Understand what a prescriber is actually looking for

Even when your BMI qualifies, a prescriber still reviews your full health picture before approving treatment. That review exists because these medicines interact with certain conditions and medications in ways that matter clinically. Contraindications that rule someone out include a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2, a history of pancreatitis, and some inflammatory bowel conditions. Pregnancy, breastfeeding, and trying to conceive are also reasons these medicines are not recommended, for any of those, the prescriber will explain the reasoning and discuss other options. People under 18 are outside the licensed age range.

Existing medications matter too. GLP-1 medicines slow gastric emptying, which affects how some oral drugs are absorbed. For people taking oral contraceptives, tirzepatide specifically requires adding a barrier method for the first four weeks of treatment and for four weeks after each dose increase, that's not a reason to avoid treatment, but it does need to be disclosed. Our weight loss injection guide covers the key practical points a prescriber weighs up.

The detail of this review is why reputable services ask thorough questions. At nume, a GPhC-registered Independent Prescriber reads every consultation personally, a real clinician, not software. If the answer is that treatment isn't appropriate, you'll be told clearly and why.

Step 3: Check whether supply or service issues are the actual problem

Sometimes the barrier isn't eligibility at all. Through 2023 and 2024, genuine supply shortages meant Wegovy was unavailable for new patients for extended periods, and pharmacies operating without robust supply-chain relationships struggled to fill orders. That situation has largely stabilised for pharmacies sourcing through authorised UK channels, but it's worth asking any provider directly whether the dose you need is currently in stock.

A separate issue is the service model itself. Some providers operate on a subscription-only basis, lock patients to a single dose without clinical review, or charge separately for prescriptions, delivery, and aftercare. If cost was the blocker, our page on the cost and what's included in treatment sets out what a legitimate private service should cover in one transparent price. Delivery delays, complicated onboarding, and limited aftercare support are also reasons people abandon treatment before it has a chance to work, worth factoring into any comparison.

If you're unsure whether a provider you've contacted is legitimate, you can verify any online pharmacy on the GPhC pharmacy register in seconds. Services offering these prescription-only medicines without a clinical assessment are breaking UK law and are a safety risk.

Step 4: Find out what's actually possible for you now

If you've read this far and still aren't sure which barrier applies, the most efficient next step is a free clinical consultation. That conversation (whether through a private service or a GP referral) will tell you within the same day whether you qualify, which medicine is better suited to your history, and what the process looks like from there. Our fuller guide to how to get weight loss injections walks through the private route step by step.

People who don't meet the NHS criteria, or who can't wait for a specialist referral, often find that the private licensed route is already open to them. The list of clinical contraindications is specific and well-defined, most adults with a BMI above the licence threshold and no relevant history will pass the assessment. Those who are currently on treatment elsewhere and considering switching can find practical information on how the transfer process works. And if you're weighing up which injection might be right for your situation, our overview of available weight loss injections sets out the key differences in plain terms, with evidence cited from NICE's appraisal of tirzepatide (TA1026).