The number that catches people out isn't the price of their first pen — it's the total once a full year of Mounjaro is added up, dose by dose. The advertised starter price is the cheapest month you will ever have. Real budgeting means mapping the whole titration ladder, because the pen gets stronger (and dearer) as you climb, and a year is longer than most people count.
This planner costs a realistic year three ways — settling at 5 mg, at 10 mg, or pushing to the 15 mg maximum — using today's live prices from the pharmacies we track. Every figure below was checked on 4 July 2026.
A realistic first year that titrates up and settles on a 10 mg maintenance dose works out to about £3,150 at our recommended pharmacy — or roughly £3,019 if you buy every single dose at the cheapest regulated price. Settle lower at 5 mg and the year is closer to £2,345; climb to the 15 mg maximum and it's about £3,445. The dose you land on moves your yearly total more than the pharmacy you pick.
Why a year is 13 packs, not 12
Each Mounjaro KwikPen covers four weeks, and a year is 52 weeks. 52 ÷ 4 = 13, so a full year is thirteen packs, not twelve. It's an easy mistake to price a year as "monthly × 12", but that quietly undercounts your real bill by a whole pack — anywhere from about £185 to £300 depending on your dose. Every total on this page uses the honest 13-pack figure.
The titration ladder — what each rung costs
Mounjaro is started low and stepped up slowly to keep side effects manageable: 2.5 mg for the first four weeks (a starter dose, not a treatment dose), then 5 mg, then raised in 2.5 mg increments (7.5, 10, 12.5) after at least four weeks each, up to a maximum of 15 mg. Your maintenance dose — the one you stay on — is usually 5, 10 or 15 mg, and a prescriber decides it with you. Here's what one four-week pack costs at each rung today.
| Dose | Cheapest regulated pharmacy | The Weight Clinic ★ (our pick) |
|---|---|---|
| 2.5 mg (starter) | £145.99 (£122 with a first-order code) | £125 (£160, code NEWME) |
| 5 mg | £173.99 | £185 |
| 7.5 mg | £222.99 | £240 |
| 10 mg | £249.99 | £260 |
| 12.5 mg | £269.99 | £275 |
| 15 mg | £288.99 | £295 |
The "cheapest regulated" column is the single lowest ongoing price on our board for that dose. See every pharmacy and today's prices on the live table.
A full year at 5 mg maintenance — about £2,345
The lightest realistic year: one starter pack, then straight onto 5 mg for the rest. This is the year for someone who reaches a comfortable, effective 5 mg dose and stays there. Priced at our recommended pharmacy:
| Packs | Dose | Each | Line total |
|---|---|---|---|
| 1 | 2.5 mg (code NEWME) | £125 | £125 |
| 2–13 (12 packs) | 5 mg | £185 | £2,220 |
| Year total | £2,345 | ||
A full year at 10 mg maintenance — about £3,150
The most common path: step up through 5 and 7.5 mg over the first few months, then hold at 10 mg for the rest of the year. This is the number most people should plan around.
| Packs | Dose | Each | Line total |
|---|---|---|---|
| 1 | 2.5 mg (code NEWME) | £125 | £125 |
| 2 | 5 mg | £185 | £185 |
| 3 | 7.5 mg | £240 | £240 |
| 4–13 (10 packs) | 10 mg | £260 | £2,600 |
| Year total | £3,150 | ||
You can shave this down further by buying each rung at the cheapest regulated price on the board rather than staying with one pharmacy. Do that — 2.5 mg at £122 with a first-order code, then 5, 7.5 and 10 mg at their lowest listed prices — and the same 10 mg year comes to about £3,019, roughly £130 less. The trade-off is more admin and no single prescriber overseeing the whole course, so only ever switch between GPhC- or CQC-regulated pharmacies. Our guide to legitimate ways to pay less for Mounjaro walks through how to do it safely.
A full year at 15 mg maximum — about £3,445
The heaviest year: titrate all the way through every rung and finish on the 15 mg maximum. Fewer people end up here, but if you're planning for it, this is what a full twelve months looks like.
| Packs | Dose | Each | Line total |
|---|---|---|---|
| 1 | 2.5 mg (code NEWME) | £125 | £125 |
| 2 | 5 mg | £185 | £185 |
| 3 | 7.5 mg | £240 | £240 |
| 4 | 10 mg | £260 | £260 |
| 5 | 12.5 mg | £275 | £275 |
| 6–13 (8 packs) | 15 mg | £295 | £2,360 |
| Year total | £3,445 | ||
5 mg maintenance ≈ £2,345 · 10 mg maintenance ≈ £3,150 · 15 mg maximum ≈ £3,445. The gap between the lightest and heaviest year is over £1,000 — which is why the dose you settle on matters more to your annual bill than any single discount code.
Four ways to keep your year-cost down
The pen price is fixed, but your yearly total isn't. A few habits keep it honest:
- Start with a genuine first-order code. A welcome offer knocks real money off pack one — see the live ones in our round-up of Mounjaro discount codes that actually work.
- Judge the ongoing price, not the promo. A jaw-dropping first month can hide a dear month two onward. Because you'll pay the ongoing price eleven or twelve times, it matters far more than the headline — our cheapest Mounjaro deals this month page ranks by that real number.
- Buy each dose at its lowest legitimate price. Switching regulated pharmacies as you titrate is where the ~£130 saving above comes from; the six legitimate ways to pay less covers the mechanics.
- Never chase a price that's too good to be true. A cheaper regulated pen is the same tirzepatide; a suspiciously cheap unregulated one is a different risk entirely. Our guide on whether cheap Mounjaro is safe shows how to tell them apart.
Our recommended pharmacy for the year ahead
The Weight Clinic is where we point most readers: a GPhC-registered pharmacy with monthly video reviews so a prescriber actually checks how you're getting on as you titrate. Use code NEWME for £35 off your first order, and if you're declined for treatment they refund you — so it costs nothing to find out where you stand.
Visit The Weight Clinic →Frequently asked questions
What does a year of Mounjaro cost in the UK?
A realistic first year, titrating up and settling on a 10 mg maintenance dose across 13 four-week packs, costs around £3,150 at our recommended provider, or roughly £3,019 if you use the single cheapest regulated pharmacy at every dose. A lower 5 mg maintenance year is closer to £2,345, and climbing to the 15 mg maximum is about £3,445. Prices checked 4 July 2026.
Why is it 13 packs and not 12?
Each Mounjaro pack covers four weeks, and a year is 52 weeks. 52 divided by 4 is 13, so a full year is 13 packs. Pricing it as monthly times 12 quietly undercounts your real annual bill by one pack.
Does the price go up as I increase my dose?
Yes. Higher-strength Mounjaro pens cost more, so your monthly bill rises as you titrate up. That is why the dose you settle on matters more to your yearly total than which pharmacy you pick; the gap between a 5 mg and a 15 mg maintenance year is over £1,000.
Can I really save money by switching pharmacies mid-course?
You can. The same 10 mg pack ranges from about £249.99 to £324 across regulated UK pharmacies on our board, so buying each dose at the lowest legitimate price shaves roughly £130 off the year. The trade-off is more admin and no single prescriber overseeing your whole course. Only ever switch between GPhC- or CQC-regulated pharmacies with a proper consultation.
Is a cheaper year a lower-quality year?
Not if the pharmacy is UK-regulated. A cheaper legitimate price is the same tirzepatide, dispensed under the same rules. The danger is chasing prices that look too good because the seller skips the prescriber. Every price on our board comes from a GPhC- or CQC-regulated provider.
Prices in this planner were checked on 4 July 2026 and change often — always confirm the current price on the pharmacy's own website before you order. This is price information, not medical advice.