Mounjaro 12.5mg Price Comparison UK (October 2026)

01 · The price

What does Mounjaro 12.5mg cost in the UK?

At EverydayMeds the standard price of one 12.5mg pen is £319.99, which works out at about £80.00 per week. Each pen contains four weekly doses, so one pen covers four weeks. You can see all six strengths on the Mounjaro pen prices and consultation page.

New customers save £40 on their first order with code FIRST40. This applies at any dose, including people who switch to us part-way through treatment and are already on 12.5mg. After that, an automatic £25 reorder discount applies to every future order (code DOSE25). The consultation is free, and the price shown is the price paid with no hidden fees.

For context, the UK pharmacies we track list Mounjaro pens (all doses, all providers) from £143.96 to £339.00 per pen, as of our index checked 11 October 2026. For the same dose, the difference between the smallest and largest provider gap is £27 to £41. Boots' Mounjaro doses range from £179.00 to £339.00 per month across its lowest and highest strengths. These are per-pen, per-month figures and they move, so the date matters. Our own 12.5mg price page and the KwikPen 12.5mg price guide carry the live numbers.

02 · Total cost

What should a 12.5mg price include?

A fair comparison needs the same things on both sides, so check each provider against this list before you decide.

• Consultation: ours is free, short and reviewed by a GPhC-registered prescriber, not a scoring script.
• Delivery: ours is free next-day tracked delivery by DPD in temperature-controlled, discreet packaging. Saturday delivery is £14.99.
• Supplies: needles, a sharps bin and injection guidance come with every order.
• Aftercare: ongoing monthly reviews, dose-titration and follow-up assessments, plus side-effect support from the prescribing team.
• Supply source: official LillyDirect supply, so you receive genuine KwikPens direct from Eli Lilly's UK distribution.

A provider that looks lower on the headline price but charges separately for any of these may cost you more overall. Ask for the final basket total before you pay. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

03 · Ordering

How does ordering a 12.5mg pen work?

Ordering takes three steps. First, complete the free online consultation, a short health questionnaire with no charge and no obligation. Second, a GPhC-registered prescriber reviews it; if the order is unsuitable it is refunded automatically. Third, our registered pharmacy dispenses and dispatches the pen the same day when you order by 3pm, with free next-day tracked delivery.

Repeat orders re-check suitability, and nothing ships automatically. There are no subscriptions, and you can pay by Visa or Mastercard, Klarna or pay-monthly options. If you want to see availability first, all six doses are in stock; the 12.5mg availability page has the detail. When you are ready, you can order a 12.5mg pen through the same consultation.

04 · Where 12.5mg sits

Where 12.5mg sits on the Mounjaro dose ladder

Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly. In the UK it is licensed for weight management in adults and for type 2 diabetes. It comes as a pre-filled multi-dose KwikPen in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹

Everyone starts on 2.5mg once a week. That starting dose is about letting your body adjust, not about weight loss itself. 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) up to a maximum of 15mg weekly, depending on how you respond and tolerate it.¹ That makes 12.5mg the fifth strength on the ladder and the step just below the maximum licensed dose.

Many people settle at a maintenance dose of 5mg, 10mg or 15mg. Higher is not automatically better, and your prescriber will guide the right pace.¹ Some people reach 12.5mg and stay there because it suits them; others stop at a lower step. This matters for price comparison because you only need a 12.5mg pen if your prescriber has taken you there. Comparing 12.5mg prices before you have reached that step is useful for planning, but your dose is a clinical decision, not a shopping decision.

How tirzepatide works

Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin. In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet.¹ This dual action distinguishes Mounjaro from single-action GLP-1 medicines such as semaglutide (Wegovy/Ozempic).

Tirzepatide has a half-life of about five days, so after a final dose it takes roughly 4–5 weeks to clear the system. There is no way to speed this up, and nothing needs doing while it clears.¹ For a deeper walk-through, see our guide to how the 12.5mg dose works.

What this means for your costs

Every pen, whatever its strength, holds four weekly doses, so the monthly price is the figure to compare across providers and doses.

05 · Comparing fairly

How to compare Mounjaro prices fairly

A fair comparison matches dose, pack size, date and inclusions. Many comparison tables mix first-order promotional prices with standard prices, or list different doses side by side, which makes the gaps look bigger or smaller than they are. Before trusting any chart, check five things.

• Same dose. A 12.5mg pen must be compared with another 12.5mg pen, not with a starting pen.
• Same pack. Our prices are per pen, which is four weeks of weekly doses.
• First order or repeat. Many providers show a lower first-order price, then a higher one for every later order. Ask what month two costs.
• Date. Prices change. A chart without a date is not reliable, and ours are checked and dated.
• What is included. Consultation, delivery, cold-chain packaging, sharps bin and follow-up can all be separate lines elsewhere.

First order versus ongoing cost

At EverydayMeds the standard price of a 12.5mg pen is £319.99. A new customer gets £40 off the first order with code FIRST40, and every later order gets an automatic £25 off the standard price (code DOSE25). That means your ongoing monthly cost is the standard price less the reorder discount. When another provider shows a headline price, ask whether it is a first-order figure and what you will pay after that.

What the price index shows

Our own index of the UK pharmacies we track, checked 11 October 2026, shows Mounjaro pens (across all doses and providers) from £143.96 to £339.00 per pen. For the 2.5mg starting pen alone, the range is £143.96 to £179.99. For the same dose, provider-to-provider gaps run from £27 to £41. Those are index figures for the pharmacies we track, not for every seller in the UK, and they say nothing about which provider suits you.

High-street names appear in many comparisons. Boots' Mounjaro prices span £179.00 to £339.00 per month between its lowest and highest doses. For a wider picture, our Mounjaro injection price comparison and the 12.5mg comparison with stock status put several providers on one page. If you are looking for the lowest figure, our 12.5mg value guide covers what else to weigh.

Red flags in price comparisons

Treat a very low price with caution. Genuine UK stock is supplied through Lilly's official distribution to licensed pharmacies, so a price far below the rest of the range deserves questions about who is supplying the pen. A fair comparison also never involves a seller offering to supply without a consultation or prescription. If a price looks too good to be true, check the seller on the GPhC register before you pay anything.

06 · Planning the cost

Planning what reaching 12.5mg costs over time

You do not start on 12.5mg, so the real cost question is what the whole route costs. Everyone starts on 2.5mg, moves to 5mg after at least 4 weeks, and then steps up by 2.5mg at a minimum of 4-week intervals.¹ The minimum time to reach 12.5mg is therefore set by the licence, and your own pace may be slower if your prescriber holds a dose longer.

At standard prices, before discounts, if you step up after 4 weeks on each of 2.5mg, 5mg, 7.5mg and 10mg, your first four pens cost £959.96. A new customer's first order is £40 less, and every later order is £25 less. Only after that phase could a 12.5mg pen enter the plan, at £319.99 per four-week pen at the standard price.

All figures are standard prices before discounts. For a 12.5mg maintenance dose, the clean figure to budget with is the monthly pen price of £319.99, less £25 on each reorder.

Why your dose may not rise to 12.5mg

Dose is chosen by response and tolerance. Many people settle at 5mg, 10mg or 15mg, so a plan that assumes 12.5mg may overstate or understate your own costs.¹ Treat any total as a planning tool, and revisit it at each monthly review, where the prescribing team looks at how you are doing before any dose change.

Spreading the cost

If the monthly outlay is the concern, we accept Visa and Mastercard, Klarna and pay-monthly options. There are no subscriptions, so you are never locked in, and repeat orders re-check suitability rather than shipping automatically. The step-by-step free consultation is the place to ask about your own plan.

07 · Is 12.5mg right

Is 12.5mg right for you, and what do trials show?

Whether you need 12.5mg is a clinical decision, and it starts with whether Mounjaro is suitable at all. 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. A prescriber will assess your BMI, medical history and current medicines before deciding whether it is suitable for you.¹

What the main trial reports

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone. These are trial averages; individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.²

At 72 weeks, 85% of participants on 5mg, 89% on 10mg and 91% on 15mg had lost at least 5% of their body weight. Half of participants on 10mg and 57% on 15mg lost at least 20% of their body weight.² As a worked example only, for someone starting at 100 kg, 20.9% is about 21 kg.

Pace, review and stopping rules

Weight loss on Mounjaro is gradual by design. The first weeks on 2.5mg are an adjustment phase and losses are usually modest; most measurable progress builds from 5mg onward, month by month. Trials measured results at 72 weeks, so think in months, not days, and judge progress by trend, not individual weigh-ins. 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 whether continuing or stopping is right for you.¹¹

First weeks: what is normal

Experiences differ widely in the first weeks. Some people notice appetite change and early loss in week one, others feel little until a higher dose, and both are normal. Early loss includes water weight. Mild nausea, altered appetite and tiredness in the first days after each injection are the commonest early effects and usually settle.¹

Mounjaro is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. Individual results vary.

08 · NHS versus private

NHS or private: how Mounjaro access really works

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 NHS 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 rather than waiting.

What this means for price

On the NHS in England, a prescription normally carries the standard charge, currently £9.90 per item unless you are exempt, though the right route for you depends on whether your GP service offers it to your group. If you are eligible and are offered NHS treatment, that is a legitimate and sensible option to explore with your GP first.

Choosing between the two

The honest picture is that the NHS route depends on where you sit in the phased rollout. The private route depends on a clinical consultation and on paying the price. Neither route changes the medicine: Mounjaro is tirzepatide, supplied as the same KwikPen. A regulated private pharmacy must still review your BMI, medical history and current medicines before supplying.

• Choose to ask your GP first if you are in a high-need group that the phased rollout is reaching, and you are happy to wait for local services.
• Consider private treatment if you meet the licensed criteria and want to start sooner, accepting the cost.
• Either way, use only a pharmacy you can verify on the GPhC register.

Diabetes and the NHS

Mounjaro is also licensed for type 2 diabetes in the UK, and NICE has separate guidance for that use.⁸ Whether it is offered on the NHS for diabetes is decided by your diabetes team or GP based on that guidance, so ask them directly. The NHS also provides its own overview of the medicine for both conditions.⁵

Where to go next

If you are unsure which route fits, start with the full list of weight loss treatments or speak to your GP. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full. Choosing private treatment does not stop you from asking the NHS again later as the rollout widens.

09 · Genuine pens only

Avoiding fake pens when you compare prices

The biggest risk in price shopping is a counterfeit pen. 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. Genuine treatment always involves a prescription and a clinical consultation.¹²

What a genuine pen looks like

Mounjaro is manufactured by Eli Lilly. Genuine UK stock is supplied through Lilly's official distribution to licensed pharmacies, and every pen carries a batch number and expiry date that can be checked.⁷ A genuine UK pen comes from a registered pharmacy, arrives cold-chain packaged, and the solution inside is clear and colourless.¹³

Do not use a pen that has been frozen, looks cloudy or discoloured, has particles in it, is past its expiry, has been above 30°C, or has been out of the fridge for more than 30 days in use. If supply or packaging ever seems wrong, check the pharmacy on the GPhC register and contact the pharmacy before injecting.¹³

A checklist before you buy

• Is the seller on the GPhC register, with a registration number you can look up? Ours is 9012878.
• Does the seller require a consultation reviewed by a GPhC-registered prescriber?
• Will the pen arrive in cold-chain packaging with a batch number and expiry date?
• Is the seller open about where its stock comes from? Ours is official LillyDirect supply, direct from Eli Lilly's UK distribution.
• Is the price in a believable range compared with the dated index?

Walk away from any seller offering to supply without a consultation or prescription. Medicines bought that way are not just risky for you, they are outside the regulated supply chain that makes a genuine pen checkable in the first place.

Reporting a problem

If you suspect a fake pen, or you have a side effect from any pen, you can report it through the MHRA Yellow Card scheme.⁷ Our support team is available Monday to Friday, 9am to 5pm, by email at support@everydaymeds.co.uk, through account portal chat or by phone on 0333 207 0413.

10 · Saving money safely

Managing the monthly cost of a 12.5mg pen

• Spread payment using Klarna or pay-monthly options, which carry no subscription lock-in.
• Compare totals, including delivery and follow-up, rather than headline prices alone.

Cost-saving supplements marketed under nicknames such as a "poor man's Ozempic" are a different matter. They are low-cost supplements with no clinical oversight, and their dosing is not standardised, so they are not a like-for-like alternative to a licensed medicine and we do not treat them as one.

11 · Using your pen

Using, storing and travelling with your 12.5mg pen

Mounjaro is injected under the skin (subcutaneously) once a week, on the same day each week, at any time of day, with or without food. Licensed injection 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 with each dose. Each KwikPen contains four weekly doses.¹ Needles, a sharps bin and injection guidance come with every order.

Day, time and missed doses

There is no best time of day. Mounjaro works the same morning or evening, with or without food, and what matters is the same day each week. Many people choose a weekend morning so early side effects fall on days off.¹

If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time, then carry on with your usual day. If more than 4 days have passed, skip the missed dose entirely and take the next one on your normal day. Never take two doses within 3 days of each other. You can change your injection day if at least 3 days (72 hours) have passed since your last dose.¹

Storage

Keep Mounjaro pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept out of the fridge not above 30°C for up to 30 days, which is useful for short trips, after which it should be discarded. Keep the pen cap on to protect it from light, and never use a pen that has been frozen.¹ Unopened pens should be kept in the fridge and keep until the expiry date printed on the box.¹³

Travelling

You can fly with Mounjaro. Carry pens in hand luggage, because hold luggage can fall below freezing, ideally in a cool bag with the prescription label or a copy of your prescription. In-use pens tolerate up to 30 days not above 30°C, so most holidays need no special arrangements; for hot climates use an insulated pouch. Check destination rules for travelling with prescription injectables before you fly.¹

If an unopened pen has been out of the fridge, check with the pharmacy before using it rather than relying on a remembered day limit, because figures circulating online often come from other countries' labels.¹³ Storage matters for value as well as safety: a pen that has been frozen or left out cannot be used, and its cost is wasted.

Support alongside the pen

Our prescribing team provides ongoing monthly reviews, dose-titration and follow-up assessments, and side-effect support. The free GLPTrackr companion app (iOS and Android) lets you track your injections and progress. Those services sit inside the price, which is one more reason to compare totals rather than headline figures.

12 · 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