Cheap GLP-1 in the UK: What It Really Costs (October 2026)

01 · The price

What a cheap GLP-1 costs in the UK

A cheap GLP-1 in the UK is a genuine, prescribed pen at a fair monthly price, not a bargain from an unverified seller. For Mounjaro, the Mounjaro pen starts at £169.99 for the 2.5mg starter pen at standard price. New customers save £40 on a first order at any dose with code FIRST40, so a first 2.5mg pen is £129.99. Every later order is then £25 off the standard price (code DOSE25).

The dose you need changes the cost, because each strength has its own price. The 5mg pen is £218.99, 7.5mg is £279.99, 10mg is £290.99, 12.5mg is £319.99 and 15mg is £329.99, all at standard price and per month (one 4-week pen). Switching to us from another provider at 15mg? Your first order is £289.99. All six doses are in stock.

Across the UK pharmacies we track, the cheapest and dearest Mounjaro pens at any dose are £143.96 and £339.00. For the 2.5mg starter pen alone, the range is £143.96 to £179.99. For the same dose, the gap between providers runs from £27 to £41. Boots' Mounjaro dose prices run from £179.00 to £339.00. That spread is why comparing like-for-like doses is the single most useful money-saving step.

02 · Included

What the price includes

The price shown is the price paid; the consultation is free and there are no hidden fees. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

• Official LillyDirect supply: genuine KwikPens sourced directly from Eli Lilly's UK distribution.
• Free next-day tracked delivery in discreet, temperature-controlled packaging, with same-day dispatch when ordered by 3pm. Saturday delivery is £14.99.
• Needles, a sharps bin and injection guidance with every order.
• Ongoing monthly reviews, dose-titration and side-effect support from the prescribing team.

Payment is by Visa or Mastercard, Klarna or pay-monthly options. There are no subscriptions, and repeat orders re-check suitability rather than auto-shipping. If you are looking at the discount mechanics in detail, see our Mounjaro discount code guide.

03 · Ordering

How ordering works

Ordering takes three steps, starting with a free consultation.

• Free online consultation: a short health questionnaire, with no charge and no obligation. Start your free consultation.
• 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 delivery: our registered pharmacy dispenses, and free next-day tracked delivery follows.

You can browse every option on our weight loss treatments page, and our guide to the most affordable GLP-1 options goes deeper on comparing providers.

Related guide: Cheap glp1 shots.

04 · Mounjaro, Wegovy, liraglutide

Which GLP-1 is the cheapest?

The honest answer is that it depends on the medicine, the dose and the provider, and a low starting price can be followed by much higher maintenance prices. The three injectable GLP-1-type options most UK readers compare are Mounjaro (tirzepatide), Wegovy (semaglutide) and liraglutide (Saxenda and similar products). Each has a different dosing pattern, and that shapes what you pay across a year.

Mounjaro is a once-weekly KwikPen in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ Wegovy is also once weekly, with a ladder of 0.25mg, 0.5mg, 1mg, 1.7mg and 2.4mg. It steps up after at least four weeks and reaches the 2.4mg maintenance dose from week 17.¹⁸ Liraglutide is supplied at 6mg per millilitre and is a daily injection, unlike the weekly pens.¹⁸

The monthly price of one pen is only part of the picture. Wegovy reaches its maintenance dose from week 17, whereas Mounjaro maintenance depends on the strength you and your prescriber settle on, anywhere from 5mg up to 15mg.

Trial results from different medicines should not be compared as if they were head to head, so do not choose on price using them. A medicine that costs less per month but suits you poorly, or that you stop early, is not cheaper in any meaningful sense. Ask your prescriber which option fits your health history first, then compare prices for that option.

When you compare providers, check the same dose, the same month, and what is included: consultation, delivery and follow-up. A headline starting price that excludes any of these is not the same product as one that includes them. Our own consultation is free and delivery is free next-day, so the price shown is the price paid.

05 · NHS versus private

NHS or private: the honest picture

NHS treatment is the lowest-cost route for people who qualify, but access is being phased in over several years. Mounjaro is available on the NHS, and NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition.⁴ The NHS primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁶ Full rollout is expected to take years.⁶

In England, the NHS prescription charge is £9.90 per item for people who pay it, and some people are exempt. That charge only applies once you are actually prescribed the medicine on the NHS, which depends on meeting local criteria and where the rollout has reached. Ask your GP surgery what applies to you. For Wegovy, NHS access runs through specialist weight-management services; ask your GP.

Many people who meet the licensed criteria but not the early NHS groups choose regulated private treatment rather than wait. That is a fair choice if you can afford it, but it is not a requirement, and nobody should feel pushed into private care. If you are in a priority NHS group, ask your GP first.

When private makes sense

Private treatment suits adults who meet the licensed criteria and want to start without waiting for NHS capacity. You get a consultation reviewed by a GPhC-registered prescriber, home delivery and regular reviews. You also pay the monthly pen price, so planning your year cost matters.

Eli Lilly announced a UK list-price increase for Mounjaro on 14 August 2025, effective 1 September 2025. Pharmacy sell prices vary because of confidential discounts, which is why the spread between providers is so wide today.

Private does not mean unregulated

Whichever route you take, a genuine prescription medicine involves a clinical consultation and a prescriber. Anyone offering to supply without a consultation or prescription is not offering genuine treatment, however low the price looks.

If you are weighing up a shortlist, our page on building a low-cost GLP-1 plan walks through monthly budgeting for private treatment, including phased dose steps.

06 · Year cost planning

What a GLP-1 costs over a year

A first year of Mounjaro costs £2,711.88 at standard prices if you settle at 5mg, and up to £3,599.88 if you settle at 15mg. These totals cover 52 weeks, which is 13 pens, before any discounts. A new customer's first order is £40 less, and every later order is £25 less than the standard price.

The dose ladder is the main cost driver. Mounjaro starts at 2.5mg and steps up after at least 4 weeks on each dose; if you step up after 4 weeks on each dose, your first four pens (2.5mg to 10mg) cost £959.96 at standard prices. Not everybody needs to reach the top strength. Your prescriber reviews your response and side effects monthly and decides whether to hold or move up.¹

How to keep the cost down safely

The safest savings come from comparing like for like and using the discounts that apply. First, compare the same dose across providers, since the gap for one dose runs from £27 to £41 across the UK pharmacies we track. Second, use the new-customer and reorder discounts.

Klarna and pay-monthly options spread the payment without a subscription. There is no lock-in, and each repeat order re-checks suitability, so you stay in control of whether and when you continue.

Budget for the whole course, not only the first pen. A starter pen is the cheapest step on the ladder by design, and later strengths cost more. Plan for where you are likely to settle, not only where you begin.

07 · What you get for the money

What the medicine delivers for the cost

Cost only makes sense next to what the treatment can do, and the SURMOUNT-1 trial is the main trial for Mounjaro. In 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.² These are trial averages, and individual results vary.

As a worked example only, for someone starting at 100 kg, 20.9% is about 21 kg. That is straight arithmetic of the trial average, not a prediction for you, and trial averages do not predict your own result. Treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.²

At 72 weeks in SURMOUNT-1, 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 Your prescriber decides with you which dose suits you; higher is not automatically better.

Tirzepatide versus semaglutide

In the first large head-to-head trial (SURMOUNT-5), adults on tirzepatide lost on average 20.2% of body weight over 72 weeks versus 13.7% on semaglutide 2.4mg (Wegovy); both are effective, licensed treatments, and which suits you depends on your health profile, tolerance and prescriber advice.¹⁵ The practical point for price-led readers is that the cheaper pen is not automatically the better value if it suits you less.

How Mounjaro works

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.¹ In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet. That dual action distinguishes it from single-action GLP-1 medicines such as semaglutide (Wegovy and 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. Nothing needs doing while it clears, and nothing speeds it up.¹

Ask the questions that decide value: are you eligible, do you tolerate it, and will you keep up the diet and activity changes alongside it? A pen you cannot use properly costs the same as one that works.

08 · Who can use it

Are you eligible for a prescription GLP-1?

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. Qualifying conditions include high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, prediabetes or type 2 diabetes.¹ It must be used alongside a reduced-calorie diet and increased physical activity.

A prescriber assesses your BMI, medical history and current medicines before deciding whether it is suitable for you. The decision is clinical, not a price decision, and it is why a low price is never a reason to skip the consultation. If you are not eligible or the medicine is unsuitable, the order is refunded automatically in full.

Why eligibility affects the cost

Paying for something you cannot safely use is the most expensive mistake. The consultation exists to prevent that, and ours is free with no obligation. A GPhC-registered prescriber, not a scoring script, reviews your answers and decides.

Eligibility also affects which route is available to you. Adults meeting the NICE criteria may qualify for NHS treatment as access widens, while adults who meet the licensed criteria but not the earliest NHS groups can choose private treatment. Neither route is a shortcut around assessment.

Medicines that can change the picture

Mounjaro can reduce absorption of oral contraceptives, because stomach emptying slows. The SmPC advises switching to a non-oral method, or adding a barrier method (such as condoms), for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase.¹ If you take an oral contraceptive, speak to your prescriber before starting. If you take insulin or a sulfonylurea, doses may need adjusting because of the risk of low blood sugar, which your prescriber will plan with you. Read the patient information leaflet for the full list of warnings and side effects.¹³

Report any suspected side effect through the MHRA Yellow Card scheme as well as to your prescriber.¹⁹ Our team provides side-effect support alongside monthly reviews.

If you are comparing the cost of different GLP-1 options, bring your medical history to the consultation. It lets the prescriber recommend what is appropriate for you, rather than what is merely lowest on a price list. For more on options, see cheap GLP-1 meds explained.

09 · Cheap done safely

Cheap without taking risks

The cheapest-looking GLP-1 can become the most expensive if it is fake or unsafe. The MHRA has seized thousands of fake weight-loss pens in the UK and has issued alerts after falsified Mounjaro pens were identified.⁷ Fake pens have caused hospitalisations, and some contained insulin rather than tirzepatide.

Only buy from a pharmacy you can verify on the GPhC register, never from social media, beauty salons or unverified websites.¹² Genuine treatment always involves a prescription and a clinical consultation. Our GPhC registration number is 9012878, and our Mounjaro is supplied through official LillyDirect supply direct from Eli Lilly's UK distribution.

Check your pen

A genuine UK Mounjaro pen comes from a registered pharmacy with a batch number and expiry date, arrives cold-chain packaged, and the solution inside is clear and colourless. Do not use a pen that has been frozen, looks cloudy or discoloured, has particles in it, is past its expiry, or has been above 30°C or out of the fridge for more than 30 days after first use. If supply or packaging ever seems wrong, check the pharmacy on the GPhC register and contact the pharmacy before injecting.

10 · Cheaper alternatives

Are there cheaper alternatives to Mounjaro?

There are lower-priced options, but cheaper is not the same as equivalent. The alternatives are a different prescription medicine such as Wegovy or liraglutide, or non-drug support such as diet and activity programmes. Which is right depends on eligibility and your prescriber's advice.

Our first Wegovy pen is £99.99 on a first order, and the Wegovy pen page shows current prices.¹⁸ Liraglutide is a daily injection supplied at 6mg per millilitre. Figures for liraglutide vary, so your prescriber can advise on cost and suitability.

The "poor man's Ozempic"

The "poor man's Ozempic" or "nature's Ozempic" is marketing shorthand for low-cost supplements such as berberine. These are not prescription GLP-1 medicines, and the nickname does not make them equivalent. They are available cheaply without assessment, with no clinical oversight, and dosing is not standardised. Their marketing makes dramatic weight-loss claims that are not backed by trial evidence.

Will Mounjaro become cheaper?

Pharmacy sell prices differ because of confidential discounts. Today the spread between providers for the same dose runs from £27 to £41 across the UK pharmacies we track.

If you are eligible for NHS treatment, ask your GP about your place in the phased rollout. If you are choosing private care, compare on the same dose and use the discounts that apply today.

What not to trade away

Do not trade away supervision, genuine supply or the licensed weekly schedule for a lower number on the screen. The savings are small compared with the cost of a fake pen, a dosing error or a stopped course. Your monthly prescriber reviews, side-effect support and tracked delivery are part of what the price buys, and the GLPTrackr companion app is a free way to track your journey.

11 · 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