Mounjaro 2.5mg Price UK (October 2026)

01 · Price

How much is Mounjaro 2.5mg in the UK?

The standard price of one 2.5mg pen is £169.99, and it lasts four weeks. Your first 2.5mg pen costs £129.99 with code FIRST40, because new customers save on their first order at any dose. You can see live prices for every strength on the Mounjaro pen page, with stock in stock at the time of checking.

Across the UK pharmacies we track, the cheapest and dearest 2.5mg pens are £143.96 and £179.99. The gap between providers for the same dose ranges from £27 to £41. Boots' Mounjaro doses run from £179.00 to £339.00. Index checked 10 October 2026. Compare what each quote includes, not just the headline figure.

02 · Included

What does the price include?

The consultation is free and the price shown is the price paid, with no hidden fees. Your order is reviewed by a GPhC-registered prescriber, and an unsuitable order is refunded automatically. Delivery is free, next-day, tracked and temperature-controlled. Same-day dispatch applies when you order by 3pm. Saturday delivery is £14.99. Needles, a sharps bin and injection guidance come with every order, and you pay by Visa, Mastercard, Klarna or pay-monthly, with no subscription.

Our Mounjaro comes direct from Eli Lilly's UK distribution through official LillyDirect supply, and ongoing monthly reviews are part of the service. For a closer look at this strength, see our 2.5mg pen guide, or the wider 2.5mg injection price guide.

03 · Planning

What will the first months and year cost?

If you step up after 4 weeks on each dose, your first four pens (2.5mg to 10mg) cost £959.96 at standard prices. A first year of 13 pens costs £2,711.88 if you settle at 5mg, up to £3,599.88 at 15mg. A new customer's first order is £40 less, and every later order is £25 less.

Later doses are priced separately: see 5mg pricing and 7.5mg pricing.

Related guide: Mounjaro 7 5 mg price.

04 · Why everyone starts at 2.5mg

Why everyone starts on 2.5mg

Everyone starts Mounjaro on 2.5mg once a week. This dose is about letting your body adjust, not about weight loss itself.¹ After at least 4 weeks the dose increases to 5mg. It can then step up by 2.5mg at a minimum of 4-week intervals (7.5mg, 10mg, 12.5mg) to a maximum of 15mg weekly, depending on response and tolerance. Many people settle at 5mg, 10mg or 15mg, and higher is not automatically better.¹

Curious whether you could skip ahead? Read can you start off with 5mg of Mounjaro. The licensed ladder starts at 2.5mg, and your prescriber guides the pace.

05 · The first weeks

What to expect in the first weeks

The 2.5mg weeks are an adjustment phase, and experiences differ widely. Some people notice appetite change in week one, others little until a higher dose, and both are normal. Early loss includes water weight, so the trend matters more than any single weigh-in. Mild nausea, altered appetite and tiredness in the first days after each injection are the commonest early effects and usually settle.

Weight loss on Mounjaro is gradual by design, and most measurable progress builds from 5mg onward. In the SURMOUNT-1 trial of 2,539 adults, people lost on average 15% of body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, against 3.1% with lifestyle changes alone. Individual results vary.²

06 · Using the pen

How to use the 2.5mg pen

Mounjaro is injected under the skin once a week, on the same day each week, at any time of day, with or without food. Licensed sites are the stomach area (at least 5cm from the belly button), the front of the thigh, or the back of the upper arm if someone else gives the injection. Rotate the site each dose. Each KwikPen contains four weekly doses.¹

If you miss a dose, take it within 4 days (96 hours) of the scheduled time. After more than 4 days, skip it and take the next on your usual day, never two doses within 3 days of each other.¹³ Keep pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept out of the fridge at a temperature not above 30°C for up to 30 days after first use, then it must be thrown away. Do not use a pen that has been above 30°C or frozen.¹

07 · Avoiding cost shortcuts

Buying safely and avoiding cost shortcuts

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

08 · NHS or private

NHS or private prescription

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, and the primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴ Full rollout is expected to take years, so many people who meet the licensed criteria choose regulated private treatment. Licensed use is for adults with a BMI of 30 or above, or 27 to 30 with a weight-related condition, alongside a reduced-calorie diet and more activity.¹

To start, begin your free consultation, or see all weight loss treatments.