GLP-1 Therapy Cost Information UK (October 2026)

01 · Cost

How much does GLP-1 therapy cost in the UK?

Private Mounjaro costs £169.99 per month at the starting dose, standard price. Each pen lasts four weeks. Your first 2.5mg pen costs £129.99 with code FIRST40. You can see every strength on the Mounjaro pen page, with in stock status shown live.

Other GLP-1 medicines have different prices. Wegovy's first pen costs £99.99 as a first-order price; see the Wegovy pen page for current figures.

02 · Planning

Planning the cost of a year

Most people escalate the dose in steps, so cost rises before it settles. Year costs are shown at standard prices, before discounts. A new customer's first order is £40 less, and every later order is £25 less.

Higher strengths cost more per month, and the dose steps up at least 4 weeks apart, depending on how you respond. Our Mounjaro discount code guide explains the current offers.

03 · NHS or private

NHS or private: the honest picture

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition. The primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴⁶ Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment. The NHS prescription charge in England is £9.90 per item where it applies.

04 · Ordering

How ordering works

• Complete a free online consultation, a short health questionnaire with 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.
• We dispense and dispatch, with same-day dispatch when ordered by 3pm, then free next-day tracked delivery in temperature-controlled packaging. Saturday delivery is £14.99.

The consultation is free and the price shown is the price paid. Klarna and pay-monthly options are available, with no subscription.

05 · What you are paying for

What GLP-1 therapy cost buys

Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly. It comes as a pre-filled multi-dose KwikPen in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ Each pen is designed and licensed to deliver exactly four weekly doses.

Tirzepatide activates two gut-hormone receptors, GIP and GLP-1, which help regulate appetite, slow stomach emptying and improve the body's response to insulin. This dual action distinguishes it from single-action medicines such as semaglutide.¹

Alongside the pen, our price includes needles, a sharps bin and injection guidance, plus ongoing monthly reviews, dose titration and side-effect support from the prescribing team. Supply is official LillyDirect, direct from Eli Lilly's UK distribution. Repeat orders re-check suitability, with no auto-shipping.

06 · What results to expect

What results can the cost deliver?

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, compared with 3.1% with lifestyle changes alone.² These are trial averages and individual results vary. For someone starting at 100 kg, 20.9% is about 21 kg.

At 72 weeks, 85% of participants on 5mg, 89% on 10mg and 91% on 15mg had lost at least 5% of their body weight.² Treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them. Read more in our Mounjaro weight loss information.

07 · Who is eligible

Who can be prescribed it privately?

Mounjaro is licensed for weight management in adults with a BMI of 30 or above, or a BMI between 27 and 30 with at least one weight-related condition such as high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, prediabetes or type 2 diabetes. It must be used alongside a reduced-calorie diet and increased physical activity.¹ A prescriber assesses your BMI, medical history and current medicines first.

Mounjaro is also licensed for type 2 diabetes. If you have it, tell your prescriber and your usual diabetes team so care stays joined up. Our pages on GLP-1 and diabetes and GLP-1 RA therapy cover this in more depth.

08 · Ways not to save

Cutting cost safely: what to avoid

Mounjaro is licensed as a once-weekly medicine, with blood levels designed around a 7-day cycle.

Each pen is designed and licensed to deliver exactly four weekly doses, so use the pen as designed, then dispose of it.¹

Mounjaro must not be combined with other GLP-1 medicines, unlicensed research peptides such as retatrutide, which has no UK licence, or compounded copies. If something promises faster results outside a licensed pathway, that is the warning sign.⁷ Our pages on GLP-1 peptide therapy and the GLP-1 gene explain what is and is not a licensed treatment.

09 · Avoiding fake pens

Counterfeit safety when prices look too good

The MHRA has seized thousands of fake weight-loss pens in the UK and has issued alerts after falsified Mounjaro pens were identified. Fake pens have caused hospitalisations, and some contained insulin rather than tirzepatide.⁷ Only buy from a pharmacy you can verify on the GPhC register, never from social media, beauty salons or unverified websites.¹²

A genuine pen has a batch number and expiry date, arrives cold-chain packaged, and the solution is clear and colourless. Do not use a pen that has been frozen, looks cloudy, contains particles or is past expiry.¹³ We are GPhC-registered (9012878). Browse all weight loss treatments or read about Mounjaro therapy.

10 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹