Appetite-Suppressant Injections Prescribed by a Nutritionist? (October 2026)

01 · The short answer

Who can prescribe an appetite-suppressant injection?

Nutritionists focus on food and diet and do not prescribe medicines. Injections such as Mounjaro must be prescribed by a suitably qualified prescriber after assessing your BMI, medical history and current medicines.¹ Your options are a GP, an NHS weight-management service, or a regulated online pharmacy. See our guide to a GP prescribed weight loss injection for the NHS-side route.

Mounjaro is licensed for adults with a BMI of 30 or above, or 27 to 30 with at least one weight-related condition such as high blood pressure, prediabetes or type 2 diabetes. It must be used alongside a reduced-calorie diet and increased physical activity.¹

02 · Getting treatment

How to get Mounjaro through us

The Mounjaro pen starts at £169.99 for the 2.5mg starter, and every later order is £25 off the standard price. Ordering takes four steps:

• Complete the free online consultation — no charge, no obligation.
• A GPhC-registered prescriber reviews it. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.
• Our registered pharmacy dispenses, with same-day dispatch when ordered by 3pm.
• Free next-day tracked delivery in temperature-controlled packaging.

We supply genuine KwikPens through official LillyDirect supply, and all six doses are in stock. You can buy Mounjaro from our hub page.

03 · What the injection does

How Mounjaro suppresses appetite

Mounjaro is the brand name for tirzepatide, which activates two gut-hormone receptors, GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties and improve the body's response to insulin. Most people feel fuller sooner and less hungry between meals.¹

For non-prescription ideas, see what is a great appetite suppressant, or compare appetite suppressant pills prescribed by doctors.

04 · Results and pace

What results to expect

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, versus 3.1% with lifestyle changes alone. These are trial averages — individual results vary.² For someone starting at 100 kg, 20.9% is about 21 kg.

Weight loss is gradual. The 2.5mg weeks are an adjustment phase, and most measurable progress builds from 5mg onward. If you have lost less than 5% of your starting weight after 6 months on the highest dose you can tolerate, your prescriber will discuss next steps.¹

05 · Where a nutritionist helps

Where a nutritionist still helps

Treatment works alongside a reduced-calorie diet, not instead of one. A nutritionist or dietitian can plan meals and protein intake while a prescriber manages the medicine. Our prescribing team also provides ongoing monthly reviews and dose-titration follow-up, and the free GLPTrackr app helps you track your progress.

06 · NHS access

NHS eligibility

Mounjaro is available on the NHS, but access is phased over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴⁶ Many people who meet the licensed criteria choose regulated private treatment rather than wait.