Looking for the Mounjaro 15mg price in the UK? This is the top treatment dose of tirzepatide, so it matters more than the starter pen when you're working out the real cost of a course. And because 15 mg is where many people settle for maintenance, it's the number you'll be paying month after month — not a one-off promo. We've done the maths across all the regulated providers we track, using live prices last checked on 25 August 2026. No invented figures.
The headline: the 15 mg pen ranges from £266 to £359 per four weeks across UK providers — a spread of £93 for the identical medicine. First-month discounts don't help here, because they only ever apply to the 2.5 mg starter box. At 15 mg, list price is what you pay.
The cheapest Mounjaro 15 mg right now is Next Script and Medicine Marketplace at £266, closely followed by Totiva Health and PillSphere at £268 and Get Weightloss at £269. Our recommended provider, The Weight Clinic, is £295 at 15 mg — mid-pack, but with proper prescriber support and monthly video reviews. At the top end, Numan and Voy reach £359. Always confirm the live price before ordering.
Mounjaro 15mg price UK: the cheapest providers compared
Here are ten of the lowest-priced providers for the 15 mg pen, sorted by ongoing four-weekly price. Every provider here is a GPhC-registered pharmacy or CQC-regulated clinic. Because 15 mg is a full maintenance dose, none of the first-month starter promotions apply to it.
| Provider | 15 mg (4 weeks) | 10 mg (4 weeks) | Regulator |
|---|---|---|---|
| Next Script | £266.00 | £230.00 | GPhC pharmacy |
| Medicine Marketplace | £266.00 | £229.00 | GPhC pharmacy |
| PillSphere | £268.00 | £230.00 | GPhC pharmacy |
| Totiva Health | £268.88 | £232.88 | GPhC pharmacy |
| Get Weightloss | £269.00 | £238.47 | GPhC pharmacy |
| Manchester Chemist | £269.00 | £244.00 | GPhC pharmacy |
| Fylde Clinic | £270.00 | £235.00 | GPhC pharmacy |
| Nulife Pharmacy | £270.99 | £235.99 | GPhC pharmacy |
| Pharmulous | £274.99 | £239.99 | GPhC pharmacy |
| The Weight Clinic ★ Our pick | £295.00 | £260.00 | GPhC pharmacy |
Prices last checked 25 August 2026. This is price information, not an offer of supply. Confirm the current price on the provider's own site before ordering. Mounjaro is a prescription-only medicine.
The cluster at the top is tight — everything between Next Script and Nulife sits inside a £5 band. That's typical for the higher doses: the price race is fiercest at the popular treatment strengths. For the wider picture of how these numbers move across the whole grid, our homepage price table ranks every provider live.
Why the 15mg price matters more than the starter deal
When you first search for Mounjaro, the eye-catching prices are almost always first-month starter offers on the 2.5 mg pen. Those are genuine — but 2.5 mg is a starter dose held for just four weeks, not a treatment dose. You step up to 5 mg, then in 2.5 mg increments (7.5, 10, 12.5) after at least four weeks each, up to a maximum of 15 mg.
So if 15 mg becomes your maintenance dose, that's the figure you'll pay every four weeks for the long haul. A provider with a shouty first-month discount but a dear 15 mg price can easily cost you more over six months than a quieter, cheaper-at-the-top-doses pharmacy. We break down whether the intro deals are worth it in our guide to Mounjaro first-month offers, and the full course maths lives in the price comparison by dose.
Worth knowing: not everyone lands on 15 mg. The maintenance dose (5, 10 or 15 mg) is tailored to you and your response. In the SURMOUNT-1 trial, mean weight loss was about 22.5% at 15 mg over 72 weeks, versus roughly 21.4% at 10 mg — so many people get most of the benefit at 10 mg without needing the top dose. If you're weighing 10 mg against 15 mg on cost, the columns above show the gap is usually £30–£40 per month.
How much does a full Mounjaro course to 15mg cost?
Because you titrate up over months, no one pays the 15 mg price from day one. A realistic path — four weeks each at 2.5, 5, 7.5, 10 and 12.5 mg before reaching 15 mg — means five earlier boxes at lower prices, then ongoing 15 mg from month six onward.
At the cheaper end (Next Script), that titration path totals roughly £131 + £154 + £204.99 + £230 + £246 = about £966 for the first five months, before you even reach the £266 maintenance box. At a mid-pack provider like The Weight Clinic, the same five months come to £160 + £185 + £240 + £260 + £275 = £1,120, then £295 ongoing. The differences compound, which is exactly why it pays to compare per dose rather than fixating on the starter deal.
The Weight Clinic is our pick for most people. It isn't the rock-bottom price at 15 mg (£295), but you get monthly video reviews with a prescriber, a refund if the prescriber declines your consultation, and £35 off your first order with code NEWME (£125 instead of £160 on the starter pen). For a treatment you may take for a year or more, that ongoing clinical support is worth factoring in. See The Weight Clinic's current prices.
Cheaper isn't the only thing to check
Every provider in our table is either a GPhC-registered pharmacy or a CQC-regulated clinic, so the medicine itself is genuine, licensed Mounjaro. Price aside, look at whether a real prescriber reviews you, how they handle dose changes, and their refund policy if you're declined. Avoid anywhere selling tirzepatide without a prescription or offering "compounded" versions — these are unregulated and not licensed in the UK.
If you get side effects — most commonly nausea, diarrhoea, constipation, vomiting or tiredness, and rarely something more serious like pancreatitis — report them through the MHRA Yellow Card scheme. This article is price and information only, not medical advice; a prescriber decides whether Mounjaro is suitable for you.
For related dose comparisons, see our breakdowns of the 12.5 mg price and the cheapest Mounjaro overall ranking.
Frequently asked questions
What is the cheapest Mounjaro 15mg price in the UK?
As of 25 August 2026, the lowest 15 mg price we track is £266 per four weeks at Next Script and Medicine Marketplace, followed by £268 at Totiva Health and PillSphere. The top of the range reaches £359. Always confirm the live price on the provider's own site before ordering.
Why don't first-month discounts apply to the 15mg pen?
Starter promotions apply only to the 2.5 mg pen, which is the four-week starting dose. By the time you reach 15 mg you're on a full maintenance dose, so you pay the standard list price each month.
Is 15mg much more effective than 10mg?
In the SURMOUNT-1 trial, mean weight loss was about 22.5% at 15 mg versus roughly 21.4% at 10 mg over 72 weeks — a modest difference. Many people do very well on 10 mg. Your prescriber decides the right maintenance dose for you.
How much does a whole course up to 15mg cost?
You titrate up over several months, so earlier boxes cost less. At a cheaper provider, the first five months (2.5 through 12.5 mg) come to around £966, then roughly £266 per month at 15 mg. Mid-pack providers cost more but often include closer prescriber support.
Is the cheapest 15mg provider always the best choice?
Not necessarily. All the providers we list are regulated, so the medicine is genuine, but they differ on prescriber reviews, dose-change support and refund policies. Weigh those against the price for a treatment you may use long term.
Our recommended provider, The Weight Clinic, offers £35 off your first order with code NEWME, monthly video reviews with a prescriber, and a refund if the prescriber decides Mounjaro isn't right for you. It's a GPhC-registered pharmacy with a fair 15 mg price of £295.