Weight loss injections: When can your GP refer you?

Weight loss injections are prescription-only medicines in the UK, and they are not usually available as a general GP prescription for cosmetic weight loss. Most people access them through a specialist weight management service, a hospital-led programme, or a regulated private provider. The referral route depends on clinical need, local commissioning arrangements, and whether other weight management approaches have been tried. This guide explains how the NHS pathway works, what a GP can and cannot do, and what private assessment, prescription, monitoring, and costs may involve.

NHS eligibility and local pathway

NHS eligibility for medicines such as Wegovy (semaglutide) and Mounjaro (tirzepatide) is shaped by NICE guidance and local integrated care boards. In general, adults with a BMI of 35 or above and at least one weight-related condition may be considered, although some services use a lower threshold when specific conditions are present. Referral is usually to a specialist weight management service rather than directly to a GP prescription. Local pathways vary, so waiting times, referral forms, and criteria can differ across England, Scotland, Wales, and Northern Ireland. Some areas also require evidence of previous lifestyle or medical weight management attempts. NICE has recommended semaglutide and tirzepatide for certain adults, but funding and delivery are managed locally.

GP discussion and referral

A GP appointment is often the first step. The GP can record your weight, height, BMI, blood pressure, blood sugar, and medical history, and discuss previous weight management efforts. If you appear to meet local criteria, the GP can refer you to a specialist service. GPs generally cannot prescribe weight loss injections outside a specialist pathway because of commissioning rules and the monitoring these medicines require. It can help to ask about local services, what the referral includes, and what happens if you do not meet the criteria. A GP can also review other health issues that affect weight. If you are not eligible, the GP can still discuss other options such as diet, activity, or medicines for related conditions.

Private assessment

Private providers offer assessment through online questionnaires, video consultations, or in-person clinics. A prescriber reviews your medical history, current medicines, allergies, and risk factors before deciding whether treatment is suitable. Private assessment can be faster, but it is not a replacement for emergency care or ongoing NHS support. Regulated providers should be registered with the Care Quality Commission or an equivalent body, and they should explain side effects, storage, and what to do if you feel unwell. Some providers also offer dietitian support or follow-up consultations. Before paying, check whether the provider shares information with your GP and what happens if you need NHS care.

Prescription and monitoring

If a prescription is issued, monitoring is important. Providers usually check progress, side effects, and sometimes blood tests at set intervals. Common side effects include nausea, vomiting, constipation, diarrhoea, and headache. Serious but rare risks include pancreatitis and gallbladder problems. Injections are started at a low dose and increased gradually to reduce side effects. You should not use these medicines if pregnant or planning pregnancy, and contraception advice may be needed. Monitoring also covers dose adjustments and whether treatment remains suitable over time. Regular reviews help confirm the dose is working and that side effects remain manageable.

Medicine and service costs

Costs vary widely across the UK. NHS prescriptions in England currently cost £9.90 per item, though many people are exempt. In Scotland, Wales, and Northern Ireland, NHS prescriptions are free at the point of use. Private medicine costs depend on the product, dose, provider, and whether consultation, delivery, and follow-up are included. Private prices are usually monthly and can range from around £150 to £300 or more. These are estimates and may change over time, so it is worth checking current prices directly with a regulated provider. Some providers charge separately for consultation, delivery, or blood tests, so the monthly total can be higher than the headline price.

Prices, rates, or cost estimates mentioned in this article are based on the latest available information but may change over time. Independent research is advised before making financial decisions.

Referral for weight loss injections in the UK depends on clinical eligibility and local NHS pathways. A GP can assess and refer, while private providers can offer faster assessment for a fee. Monitoring and ongoing review remain essential whichever route is used. Anyone considering treatment should discuss risks, benefits, and alternatives with a qualified healthcare professional. Local availability can change, so checking current NHS and private options is sensible.

This article is for informational purposes only and should not be considered medical advice. Please consult a qualified healthcare professional for personalized guidance and treatment.