How to Apply for Weight Loss Injections: The UK Process Explained

What the clinical evidence says about who these medicines are for

NICE's recommendation for tirzepatide, published in December 2024 and updated in September 2025, sets out the evidence basis clearly: in the SURMOUNT-1 trial (2,539 adults, 72 weeks), participants at the highest dose lost an average of around 20–21% of their body weight. That data sits behind NICE's appraisal of tirzepatide (TA1026), which recommends it for adults with a BMI of 35 or above plus at least one weight-related condition such as high blood pressure, type 2 diabetes, high cholesterol, obstructive sleep apnoea or cardiovascular disease. For semaglutide, the STEP 1 trial (68 weeks) showed an average reduction of around 15% at the 2.4mg maintenance dose, informing NICE's recommendation TA875. Both appraisals confirm that BMI thresholds are reduced by 2.5 kg/m² for South Asian, Chinese, Middle Eastern, Black African or African-Caribbean backgrounds. What this means practically: eligibility isn't just about a number on the scale, the presence of a weight-related health condition is central to the clinical picture.

Private prescribing follows the same licensed criteria. A BMI of 30 or above qualifies, or 27 or above if you have at least one relevant condition. The prescriber weighs the full clinical context, not just the headline figure.

The steps involved in a private application through a regulated pharmacy

The private route is distinct from the NHS pathway, which is phased and currently limited to those with BMI 40 or above plus four or more of the five qualifying conditions. Privately, there is no waiting list and no GP referral required. The process at a GPhC-registered pharmacy like nume runs as follows.

First, you complete a free consultation, a structured health questionnaire that covers your weight history, current conditions, medicines you take, and relevant family history. A named, GPhC-registered Independent Prescriber then reads your responses personally; this is not an automated decision. Understanding what the prescriber is looking for can help you prepare an accurate and complete picture of your health.

Second, identity and weight are verified. At nume this happens on video, in real time, not a self-reported figure. Third, if the prescriber approves the prescription, the medicine is dispensed from our registered pharmacy and dispatched the same day for orders placed before 12pm, arriving the next working day by tracked DPD courier. Your GP is notified in line with GPhC guidance. For a full look at how tummy injection weight loss works in practice, including what to expect from the abdominal site and how it fits into the wider treatment plan, our overview of UK weight loss injections covers both medicines side by side.

What disqualifies someone, and what to do if you're not sure

Not everyone who applies will be prescribed. The prescriber must be satisfied that treatment is clinically appropriate and that no contraindications are present. These medicines are not recommended during pregnancy, while breastfeeding, or for anyone actively trying to conceive. They are not licensed for people under 18. A history of medullary thyroid carcinoma or MEN2 syndrome, certain pancreatic conditions, or severe gastrointestinal disorders are among the factors that require careful discussion before treatment can proceed.

Some medicines interact with how GLP-1 treatments are absorbed. Women taking the oral contraceptive pill who start tirzepatide are advised to add a non-oral method of contraception for the first four weeks of treatment and for four weeks after each dose increase, because gastric slowing can reduce pill absorption, NHS England's guidance on weight management injections covers this and other practical considerations clearly. If you're uncertain whether your health history would affect eligibility, the consultation is the right place to raise it. Our prescribers assess the full picture, and declining a prescription when there's a safety concern is part of their job.

After approval: the practical side of starting treatment

Once prescribed, tirzepatide treatment starts at 2.5mg, a tolerability dose whose job is to help your system adjust gradually, not to produce immediate weight loss. The dose is typically increased in steps by your prescriber over subsequent months. Semaglutide follows a similar staged introduction. You can read more about when weight loss injections tend to show results to set realistic expectations from the start.

The injections are subcutaneous, a short, fine needle into the skin of the abdomen, thigh or upper arm, rotated each week. If the idea of self-injecting feels daunting, it's worth knowing that most people find the reality much less uncomfortable than they anticipated. A step-by-step guide to the injection technique walks through the process in plain terms. Needles should be changed with each dose; disposal requires a sharps container, which can be collected from most GP surgeries or pharmacies.

For a clear sense of what ongoing private treatment costs, our cost guide explains what a legitimate private prescription price covers. The consultation at nume is free, and if the prescriber determines treatment isn't suitable, you pay nothing.