Mounjaro 5mg: Buy Online in the UK (October 2026)

01 · Price and how to order

What Mounjaro 5mg costs and how to order it online

One Mounjaro 5mg pen costs £189.99 at the standard price, which works out at about £47.50 per week. That is the price of one four-week pen, and it is what a repeat order is priced at before the reorder discount. A new customer's first order, at any dose, is £40 less with code FIRST40. Every future order then gets an automatic £25 off the standard price (code DOSE25). The consultation is free and the price shown is the price paid, with no hidden fees.

If you are switching to us from another provider and already take 5mg, you can order the 5mg pen directly after your consultation. The new-customer discount applies to your first order whatever the dose. If you are new to Mounjaro, a prescriber will normally start you on 2.5mg first, because everyone begins there. Our page on the 2.5mg starting pen covers that first step.

For a sense of the wider picture, across the UK pharmacies we track (checked 25 October 2026), the cheapest Mounjaro pen at any dose is £143.96 and the dearest is £319.99. The gap between providers for the same dose ranges from £20 to £36.03. That is why it is worth comparing like for like (same dose, same four-week pen) rather than just the headline figure. Our guide to Mounjaro 5mg price comparison sets out how to compare.

02 · Ordering

How ordering works, step by step

Ordering is a short, regulated process. Mounjaro is a prescription-only medicine, so nothing is dispensed until a prescriber has reviewed your answers. You can start your free consultation at any time.

• Free online consultation. You complete a short health questionnaire. There is no charge and no obligation.
• Prescriber review. A GPhC-registered prescriber reviews your answers, not a scoring script. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.
• Dispensing and dispatch. Our registered pharmacy dispenses your pen. Orders placed by 3pm are dispatched the same day.
• Delivery. Delivery is free, next-day and tracked with DPD, in discreet, temperature-controlled packaging. Saturday delivery is £14.99.

Needles, a sharps bin and injection guidance come with every order. You can pay by Visa, Mastercard or Klarna, and pay-monthly options are available. There are no subscriptions and repeat orders re-check your suitability, so nothing ships automatically.

03 · Planning costs

Planning what a first year costs

Because the dose rises in steps, your monthly cost changes over time. The figures here use standard prices, before any discount. A new customer's first order is £40 less, and every later order is £25 less.

Many people do not need the highest dose. Where you settle depends on your response and how well you tolerate treatment, and your prescriber guides that. If you settle at 5mg, your ongoing cost is the 5mg price each month, with £25 off every reorder. For other broader options see all weight loss treatments.

04 · Who can have 5mg

Who can be prescribed Mounjaro 5mg

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. Examples are 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.¹¹¹ The licence is the starting point. It is not the whole decision.

A prescriber will assess your BMI, medical history and current medicines before deciding whether Mounjaro is suitable for you.¹¹ This is why the consultation matters. It is a clinical review. Some people will be advised that treatment is not right for them; payment is taken when you place the order, and if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

Mounjaro is also licensed for type 2 diabetes in the UK.¹ If you have diabetes and take other medicines, tell the prescriber everything you take. Some medicines, such as insulin or sulfonylureas, may need their doses adjusted because of the risk of low blood sugar. That is an adjustment to plan with your clinical team, not an automatic bar.

Why 5mg is rarely the very first pen

Everyone starts Mounjaro on 2.5mg once a week. This starting dose is about letting your body adjust, not about weight loss itself. After at least four weeks, the dose increases to 5mg.¹ So if you are new to the medicine, expect a 2.5mg pen first. If you already take 5mg elsewhere, say so in your consultation, and the prescriber will review it as part of your history.

NHS access

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 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 instead of waiting. The NHS guide to tirzepatide explains the current position.⁵ Ask your GP if you think you qualify for NHS treatment.

05 · The dose ladder

Where 5mg sits on the Mounjaro dose ladder

Mounjaro 5mg is the second step on a six-strength ladder: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ Each strength comes as a pre-filled multi-dose KwikPen that is injected once a week. The pen contains four weekly doses.

After at least four weeks on 2.5mg, the dose increases to 5mg. From there it can step up by 2.5mg at a minimum of four-week intervals, to 7.5mg, 10mg and 12.5mg, up to a maximum of 15mg weekly. How far you go depends on how you respond and tolerate treatment.¹ Many people settle at a maintenance dose of 5mg, 10mg or 15mg. Higher is not automatically better, and your prescriber guides the right pace.¹¹

Holding a dose

There is no rule that you must climb every step. Your prescriber can hold you at 5mg for longer if you are tolerating it well and progressing, or if side effects make a step up unwise. Stepping down within the licence is also an option. The pace is set by your response, not by a calendar.

How the ladder affects cost

Because each strength has its own price, your monthly cost depends on where you settle. The 5mg pen is £189.99 at the standard price, while the 7.5mg pen is £244.99 and the 10mg pen is £274.99. A first order is £40 less at any dose with code FIRST40, and every later order is £25 off the standard price.

Keep the pen you are using until it is finished, then start the next strength when your prescriber confirms it. Do not combine strengths or adjust doses yourself. If you are unsure which pen is right for your current week, ask the prescribing team before you inject.

06 · Realistic results

What results to expect at 5mg

Weight loss on Mounjaro is gradual by design, and most measurable progress builds from 5mg onward, month by month. The first weeks on 2.5mg are an adjustment phase and losses are usually modest.¹¹ Think in months, not days.

In the SURMOUNT-1 trial of 2,539 adults, results were as follows. 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.² These are trial averages. Individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.

At 72 weeks, 85% of participants on 5mg had lost at least 5% of their body weight.² As a worked example only, for someone starting at 100 kg, 15% is about 15 kg. Trial averages do not predict your own result.

The first weeks

Experiences differ widely. Some people notice appetite change and early loss in week one. Others feel little until a higher dose. Both are normal. Early loss includes water weight, so the trend over weeks 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.¹¹

How your response is reviewed

Your prescriber reviews your response. 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 Our aftercare includes ongoing monthly reviews, dose-titration and follow-up assessments by the prescribing team, plus side-effect support.

Tracking your progress

Judge progress by trend rather than individual weigh-ins. Many people find it useful to log weight, dose day and side effects in one place. GLPTrackr is our free companion app for tracking a GLP-1 journey, available on iOS and Android. A simple record also makes your monthly review more productive, because you can show the prescriber what happened across a whole month, not just this morning's reading.

If you want to compare what different strengths offer before you order, the 5mg online pharmacy page sets out the service side by side.

07 · Injecting the pen

How Mounjaro works and how to inject the 5mg pen

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.¹ Tirzepatide activates 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. Most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet. This dual action distinguishes Mounjaro from single-action GLP-1 medicines such as semaglutide.¹

The weekly routine

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 with each dose.¹ Each KwikPen contains four weekly doses.

There is no best time of day. It works the same morning or evening. What matters is the same day each week. Many people choose a weekend morning so early side effects fall on days off.

Setting the dose

You set the KwikPen by turning the dose knob until the dose indicator shows the correct dose in the window. Follow the pen's instructions for the injection itself, and read the patient information leaflet that comes with it.

Missed doses and changing your day

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.¹

You can change your weekly injection day if needed, as long as at least 3 days (72 hours) have passed since your last dose.¹

If you stop, tirzepatide has a half-life of about five days. After a final dose it takes roughly 4 to 5 weeks to clear the system. There is no way to speed this up, and nothing needs doing while it clears.¹ For buying a single pen to try the routine, see our single pen ordering guide.

08 · Storage and travel

Storing and travelling with your 5mg pen

Keep Mounjaro pens in a fridge at 2 to 8°C and never freeze them. Once a pen is in use, it can be kept out of the fridge not above 30°C for up to 30 days, which is useful for short trips. After that it must be thrown away.¹ Keep the pen cap on to protect it from light. Do not use a pen that has been above 30°C or has been frozen.

Your delivery arrives in temperature-controlled packaging, so open the box on the day it arrives and put unopened pens in the fridge straight away. Unopened pens keep in the fridge until the expiry date printed on the box. If an unopened pen has been out of the fridge for any reason, check with the pharmacy before using it rather than relying on a remembered day limit. Figures circulating online often come from other countries' labels, and the UK label is the one that applies to your pen. The patient information leaflet and the pharmacy are the right places to check.¹³

Flying and holidays

You can fly with Mounjaro. Carry pens in hand luggage, because hold luggage can fall below freezing. A cool bag is ideal, along 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.¹ Check destination rules for travelling with prescription injectables before you fly.

Day-to-day storage tips

• Keep the cap on between injections to protect the pen from light.
• Do not leave a pen in a car, on a sunny windowsill or next to a heater.
• Keep pens away from the freezer compartment, because a frozen pen must not be used.
• Note the date you first use each pen so you know when the 30-day in-use window ends.
• Dispose of used pens and needles in the sharps bin supplied with your order.

Ordering around a trip

If you are travelling soon, order in good time. Our team can be reached Monday to Friday, 9am to 5pm, on 0333 207 0413 or at support@everydaymeds.co.uk. Orders placed by 3pm are dispatched the same day, with free next-day tracked delivery. Plan your injection day around your trip so you do not need to shift doses closer together than the rules allow. If your pen is due to run out while you are away, order the next one early enough that it arrives before you leave. For general ordering routes, see our guide to buying the Mounjaro injection online.

09 · Avoiding fake pens

How to avoid fake Mounjaro pens when buying online

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 That is why where you buy matters as much as what you pay.

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.⁷¹² Anyone offering to supply without a consultation or prescription is a red flag, however attractive the price looks. Our registration is GPhC 9012878, and you can check it on the GPhC register.

Where our supply comes from

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. Our supply is official LillyDirect supply, direct from Eli Lilly's UK distribution, with genuine KwikPens across all six doses.

Checking your pen when it arrives

A genuine UK Mounjaro pen comes from a registered pharmacy with a batch number and expiry date. It 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 date; or
• has been out of the fridge for more than 30 days, or above 30°C in use.

If supply or packaging ever seems wrong, check the pharmacy on the GPhC register and contact the pharmacy before injecting.¹³

Price is not the test

A very low price does not prove a pen is fake, and a high one does not prove it is real. The test is whether the seller is a registered pharmacy that asks for a consultation and issues a prescription. Across the UK pharmacies we track (checked 25 October 2026), the cheapest Mounjaro pen at any dose is £143.96 and the dearest £319.99, so there is a real spread between legitimate providers. If an offer sits far outside what registered pharmacies charge and comes without a consultation, treat it with suspicion.

If you have a side effect or suspect a pen is not genuine, you can report it through the MHRA Yellow Card scheme.⁷

10 · NHS or private

NHS or private: which route suits you

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 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.

That leaves two honest questions. Do you meet the NHS criteria as they currently apply in your area? And can you wait? If you do and can, your GP is the first call. The NHS prescription charge for medicines in England is £9.90 per item where it applies, although whether that applies depends on how the treatment is prescribed. Ask your GP or local service.

Who tends to choose private treatment

Many people who meet the licensed criteria choose regulated private treatment rather than waiting. The licence is broader than the first NHS groups. Adults with a BMI of 30 or above, or 27 to 30 with a weight-related condition, can be assessed privately. A private route also means a consultation online, with delivery to your door.

What stays the same either way

• You need a clinical assessment before any prescription.
• Mounjaro is used alongside a reduced-calorie diet and increased physical activity.
• Everyone starts at 2.5mg and moves up in steps.
• A prescriber reviews your response over time.

Can you use both?

If you are on an NHS waiting list or NHS pathway and also considering private treatment, tell both teams so your records are consistent. Your clinical team is best placed to advise on your own situation.

What private treatment costs over time

Planning matters because treatment continues for months. A first year costs £2,399.88 at the standard price if you settle at 5mg, up to £3,279.88 at 15mg. A new customer's first order is £40 less with code FIRST40, and every later order is £25 off the standard price (code DOSE25). Klarna and pay-monthly options are available, with no subscription lock-in. For other treatment options, see our weight loss treatment range. You can also check our registration on the GPhC register.¹²

11 · Cost-cutting to avoid

Ways to manage the cost of treatment

• Use the reorder discount: every later order is £25 off the standard price.
• Spread the cost with Klarna or a pay-monthly option, with no subscription.
• Compare providers by dose and pen size, not headline price alone. Our 5mg price comparison guide shows how.

Newer oral options are also being discussed, and our orforglipron buying guide explains what to check before you order any such medicine. Whatever you consider, a prescriber who knows your history is the right person to decide.

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