Most Mounjaro price pages quote one figure and call it a comparison. That is close to useless, because you do not stay on one dose. You titrate: 2.5mg for the first month, then 5mg, and upward in 2.5mg steps as your prescriber decides. The price climbs with the strength — so the only Mounjaro price comparison worth reading is one done dose by dose.
So that is what this is. We pulled every published price from all 24 regulated UK providers in our grid and lined them up at each of the six pen strengths. The headline: the cheapest provider at a given dose can be more than £80 below the dearest for the exact same pen.
At 2.5mg the spread across providers runs from £145.99 to £229.00 — an £83 gap for an identical starter pen. That gap narrows as you climb the ladder but never closes: even at 15mg the cheapest (£288.99) undercuts the dearest (£359.00) by £70 a month. Which dose you are on decides how much shopping around is worth.
Mounjaro price comparison by dose
Here is the picture across all six strengths. "Cheapest" is the lowest published ongoing price in our grid at that dose; "typical" is the median across the 24 providers; "dearest" is the top of the range. All figures are per 4-week pen and were last checked on 4 July 2026.
| Dose | Cheapest | Typical (median) | Dearest | Gap |
|---|---|---|---|---|
| 2.5 mg (starter) | £145.99 | £169.99 | £229.00 | £83.01 |
| 5 mg | £173.99 | £189.99 | £259.00 | £85.01 |
| 7.5 mg | £222.99 | £249.99 | £299.00 | £76.01 |
| 10 mg | £249.99 | £279.99 | £324.00 | £74.01 |
| 12.5 mg | £269.99 | £299.99 | £344.00 | £74.01 |
| 15 mg | £288.99 | £318.00 | £359.00 | £70.01 |
Prices per 4-week pen, last checked 4 July 2026. Figures are ongoing prices — first-month promo deals (see below) can sit lower. Always confirm the current price on the provider's own site. This is price information, not an offer of supply.
Two things jump out. First, the absolute prices roughly double from the 2.5mg starter to the 15mg maintenance pen — budgeting for month one and assuming it holds is a mistake. Second, the gap between cheapest and dearest is widest at the lower doses in cash terms, but as a share of the price it stays meaningful the whole way up. Shopping around matters at every rung.
Why the price climbs with the dose
Higher-strength pens cost the pharmacy more to buy, and providers pass that on. That is the honest, boring reason. There is no clinical premium being charged — a 15mg pen is not a "better" product than a 5mg one, it is simply the dose your titration has reached. If you want the full breakdown of what drives these differences, we go into it in why Mounjaro prices vary between providers.
The practical upshot: your monthly cost is a moving target for roughly the first four to five months as you step up, then settles once you reach your maintenance dose (commonly 5mg, 10mg or 15mg). A provider that looks cheap at 2.5mg is not guaranteed to still be cheapest at 15mg — the ranking reshuffles as you climb. That is exactly why a single-number comparison misleads.
Don't let the starter price fool you
The 2.5mg pen is a starter dose, not a treatment dose — you are on it for four weeks and then you move on. Several providers dangle a low first-month price to win the click, then quietly charge more from your second pen onward. A £129 opening month means nothing if the 10mg pen you will actually live on runs £300+.
Run the maths on your likely maintenance dose, not the starter. If your prescriber expects you to settle at 10mg, compare the 10mg column, where our grid runs from £249.99 to £324.00. We break down the opening-month tactics in Mounjaro first-month offers, and if you just want the outright cheapest option at each stage, start with the cheapest Mounjaro in the UK.
Our recommended provider
The Weight Clinic — priced sensibly across the whole ladder
We rank purely on price, and The Weight Clinic is our pick for one reason: it stays keen at every dose rather than baiting you with a cheap starter and stinging you later. Its 10mg ongoing price is £260 — below the £279.99 typical — and it holds that discipline up to 15mg (£295). You also get monthly video reviews with a prescriber, and a refund if you're declined at consultation. New patients get £35 off the first order with code NEWME.
Which dose should you actually compare?
Mounjaro's dosing ladder is deliberately slow, to keep side effects manageable. In broad terms:
- 2.5mg — weeks 1–4. A starter dose to let your body adjust. Not where the money is; you are only here a month.
- 5mg — the first real treatment dose, and a common maintenance dose for some people. Median price £189.99.
- 7.5mg and 10mg — the middle of the ladder, stepped up after at least four weeks each if needed. 10mg is one of the most common places people settle.
- 12.5mg and 15mg — the upper doses, up to the 15mg maximum. Median at 15mg is £318.00.
Because your prescriber tailors the maintenance dose to you, the honest advice is: compare the column you expect to live on, plus the ones on the way up. A provider offering a flat, sensible price across the ladder saves you the hassle of switching pharmacies mid-titration. Whether a subscription or pay-as-you-go pen suits you is a separate question we cover in Mounjaro subscription vs one-off.
Reading the gap honestly
An £80-a-month gap at 5mg is £960 over a year if you stayed on that dose — real money. But do not chase the rock-bottom figure blindly. A cheap pen with a slow, paid cold-chain delivery and no prescriber contact can be worse value than a slightly dearer one that includes proper reviews. Price is the headline; delivery, consultation and support are the small print. Our full Mounjaro price grid shows all four side by side so you can weigh them together.
Frequently asked questions
Does Mounjaro cost more at higher doses?
Yes. The price rises with the pen strength because higher-strength pens cost the pharmacy more. In our grid the cheapest 2.5mg pen is £145.99 and the cheapest 15mg pen is £288.99 — roughly double — with typical prices climbing from £169.99 to £318.00 across the ladder.
Which dose should I use for a Mounjaro price comparison?
Compare the maintenance dose you expect to settle on, not the 2.5mg starter. You are only on 2.5mg for four weeks. If your prescriber expects you to reach 10mg, compare the 10mg prices — in our grid those run from £249.99 to £324.00.
How big is the price gap between providers at the same dose?
Wider than most people expect. At 2.5mg the range across our 24 providers is £145.99 to £229.00 — an £83 gap for the identical pen. Even at the top 15mg dose the cheapest undercuts the dearest by £70 a month. Shopping around is worth it at every rung of the ladder.
Is the cheapest provider at 2.5mg still cheapest at 15mg?
Not necessarily. The ranking reshuffles as you climb, because providers set their per-dose prices independently. A cheap starter month does not guarantee a cheap maintenance month. This is exactly why a single-number comparison is misleading — check the dose you will actually live on.
Are these the prices I'll pay?
These are the published ongoing prices per 4-week pen, last checked on 4 July 2026, and first-month promotions can sit lower. Prices change, and treatment is prescription-only — whether Mounjaro is suitable for you is a decision for a qualified prescriber. Always confirm the current price on the provider's own site before ordering.
Our pick, in one line
Compare on the dose you'll live on — then check The Weight Clinic
We rank every provider by price and nobody can pay to move up. On that basis The Weight Clinic is our recommended option: sensible pricing right across the ladder (£260 at 10mg, £295 at 15mg), monthly video reviews with a prescriber, and a refund if you're declined at consultation. New patients save £35 with code NEWME.