What Mounjaro 10mg Costs Per Month in the UK (2026)

If you're looking for the Mounjaro 10mg cost in the UK, here's the direct answer: across the regulated providers we track, the 10 mg pen ranges from about £229 to £324 per four weeks. That's a big spread for an identical medicine, so where you buy matters as much as the dose itself.

10 mg is a common maintenance dose — many people settle here rather than climbing all the way to 15 mg. This guide shows what it actually costs each month, why it's pricier than the starter pen, and how to keep the bill sensible without leaving the legal market.

Mounjaro 10mg cost UK: what you'll actually pay per month

Mounjaro (tirzepatide) is the same licensed pen wherever you buy it legally. What changes between providers is the dispensing fee, the consultation cost and any first-order promotion. For the 10 mg dose specifically, the four-weekly price sits well above the 2.5 mg starter — because higher doses use more medicine.

Below is a snapshot of what regulated UK providers charge for the 10 mg pen. It's a mix of the cheapest options and our recommended provider, so you can see where the value sits.

Prices last checked 25 August 2026. Confirm current pricing on the provider's own site before ordering.

Why the 10mg pen costs more than the starter dose

Mounjaro is started low and increased slowly to reduce side effects: 2.5 mg weekly for the first four weeks (a starter dose, not a treatment dose), then 5 mg, then raised in 2.5 mg steps — 7.5, 10, 12.5 — after at least four weeks on each, up to a maximum of 15 mg.

Each step up uses a stronger pen, and pharmacies price accordingly. So the jump from the 2.5 mg starter (as low as £131/4 weeks) to 10 mg (from £229) is expected, not a mark-up trick. If you want to see how the price climbs at every step, our price per pen breakdown lays it all out, and the 5mg price guide covers the dose most people reach first.

Is 10mg the dose you'll stay on?

Quite possibly. The maintenance dose (5, 10 or 15 mg) is tailored to you and your response. In the SURMOUNT-1 trial, adults on 10 mg lost around 21.4% of their body weight over 72 weeks, compared with 22.5% on 15 mg and 16.0% on 5 mg. For many people 10 mg is an effective long-term dose, so it's worth budgeting around this figure rather than the cheap starter price.

Your prescriber decides the right dose and whether to increase it — this article is price and information only, not medical advice.

How to keep your 10mg cost down (legally)

1. Compare the 10 mg column, not the headline starter price. The £229–£324 spread means the same pen can cost you nearly £100 more per month depending on provider. Use the price table.
2. Check what's included. Needles, ongoing prescriber support and monthly reviews should be part of the price, not extras that erase the saving.
3. Use a genuine first-order discount early. Most promos apply to the 2.5 mg starter pen only, so lock those in at the start. The Weight Clinic, our recommended provider, takes £35 off your first order with code NEWME and offers monthly video reviews as you step up doses.
4. Don't chase suspiciously cheap 10 mg pens. Genuine Mounjaro can't legally be sold without a prescription. A price far below the cheapest regulated pharmacy — with no consultation or ID check — is a red flag, not a bargain.
5. Ask about the decline policy. A prescriber may decide Mounjaro isn't right for you. The Weight Clinic refunds you if the prescriber declines — worth confirming any provider does the same.

Watch out for unregulated 10mg offers

Because 10 mg costs more, it's exactly the dose where people start hunting for shortcuts. Avoid unlicensed or "compounded" tirzepatide sold outside regulated pharmacies — these haven't been through the same manufacturing, quality and safety checks as the licensed pen. Stick to GPhC-registered pharmacies or CQC-regulated clinics; every provider in our table meets one or both.

If you're new to all this, start with how to start Mounjaro in the UK or our safe cheap-buying guide.

Side effects to budget your attention for

The most common side effects at any dose are nausea, diarrhoea, constipation, vomiting and tiredness — often worse in the days after a dose increase, such as the step up to 10 mg. Rare but serious risks include pancreatitis, gallstones and dehydration that can strain the kidneys. Report any suspected side effect to the MHRA Yellow Card scheme and speak to your prescriber.

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