If you type "cheapest Mounjaro UK" into Google, you get a wall of pharmacy ads and precisely zero honest maths. So we did the sums. This is our July 2026 ranking of the cheapest ways to start Mounjaro (tirzepatide) in the UK, built from the live prices of all 24 regulated online providers we track — no invented figures, no pay-to-play ordering.
One thing to settle first: "cheapest" depends on which month you mean. Fourteen of the 24 providers knock money off your first box, so the headline number you see advertised is usually a starter promo, not what you'll pay from month two onwards. We rank on both below.
On the 2.5 mg starter pen, the cheapest first month right now is Chemist4U at £122, then Pharmacy2U at £124.99, with The Weight Clinic at £125 using code NEWME. On the 5 mg ongoing pen, the cheapest is Click2Pharmacy at £173.99. The starter pen is a 2.5 mg dose held for four weeks only — the real long-run cost lives at 5 mg and above.
Cheapest Mounjaro UK: the July 2026 starter-pen ranking
Here are the ten cheapest providers for your first 2.5 mg box, sorted by the effective price you actually pay (promo where one applies, otherwise list). All figures are for four weekly doses and were last checked on 4 July 2026.
| Provider | First month (2.5 mg) | Ongoing (5 mg) | Code | Regulator |
|---|---|---|---|---|
| The Weight Clinic ★ Our pick | £125.00 was £160 | £185.00 | NEWME | GPhC pharmacy |
| Chemist4U | £122.00 was £148 | £188.00 | — | GPhC pharmacy |
| Pharmacy2U | £124.99 was £169.99 | £189.99 | — | GPhC + CQC |
| Oxford Online Pharmacy | £128.96 was £148.96 | £188.96 | — | GPhC pharmacy |
| ZAVA | £129.99 was £169.99 | £187.99 | — | CQC service |
| ASDA Online Doctor | £138.97 was £148.97 | £188.97 | WNLC10A | CQC (ZAVA) |
| Voy | £139.00 was £214 | £244.00 | — | GPhC + CQC |
| MedExpress | £139.99 was £179.99 | £189.99 | — | GPhC pharmacy |
| Click2Pharmacy | £145.99 | £173.99 | — | GPhC pharmacy |
| Phlo Clinic | £149.00 was £169 | £199.00 | — | GPhC pharmacy |
Prices last checked 4 July 2026. All 24 providers are GPhC-registered pharmacies or CQC-regulated clinics; this is price information, not an offer of supply. Confirm the current price on the provider's own site before ordering.
Notice how tightly the top of the table clusters: everything between Chemist4U and Phlo Clinic sits inside a £27 band. That's normal for Mounjaro. The list price of the 2.5 mg pen ranges from £145.99 to £229 across the 24 providers, but promotions compress the field, so a first-month deal is doing most of the work when you see a low headline number. If you want the full picture of why the same pen costs so differently, we broke it down in why Mounjaro prices vary between UK pharmacies.
Why the starter price isn't the real cheapest Mounjaro
The 2.5 mg pen is a starter dose, not a treatment dose. You hold it for four weeks, then step up to 5 mg — the first maintenance strength — and potentially higher over the following months (7.5, 10, 12.5, up to 15 mg). So the promo that got you in the door only ever applies to one box.
That flips the ranking. On the ongoing 5 mg pen, the cheapest is Click2Pharmacy at £173.99, then Cloud Pharmacy at £174.99, then The Weight Clinic at £185. A provider with a loud first-month discount but a dearer ongoing price can cost you more over six months than a quieter one. We ran the full six-month totals per dose in the Mounjaro price comparison by dose — worth a look before you commit.
The Weight Clinic is our pick for most people starting out. With code NEWME you pay £125 for the 2.5 mg starter pen instead of £160 — the third-cheapest first month on the entire grid — and £185 ongoing at 5 mg, near the front of the pack. It's a GPhC-registered pharmacy, includes needles and next-day delivery, runs monthly video reviews with a clinician, and refunds you if a prescriber declines to prescribe. That combination — genuinely low price plus real clinical follow-up — is why it beats the two pharmacies that undercut it by a few pounds.
How to actually get the cheapest Mounjaro
A few habits that save real money without cutting corners:
- Separate first-month from ongoing. Decide which matters more for you. If you're testing whether tirzepatide suits you, chase the starter deal. If you're settling in for the long haul, weight the 5 mg and 10 mg prices instead.
- Use the discount code where one exists. ASDA's WNLC10A takes £10 off, The Weight Clinic's NEWME takes £35 off. Codes are the cleanest saving on offer — no strings, applied at checkout.
- Add delivery and needles to the total. Some low headline prices charge for cold-chain postage; some bundle needles, some don't. A £4–6 delivery fee can quietly erase a £3 price advantage.
- Check whether it's a subscription. A few providers lock you into a monthly plan. We compared the trade-offs in Mounjaro subscription vs one-off buying.
- Never chase a price below the regulated market. If something is far cheaper than the £120s floor above, it's almost certainly an unregulated or "compounded" seller. Don't. Tirzepatide bought outside GPhC/CQC channels is genuinely dangerous.
If the first-month deals are what pulled you in, we keep a live rundown of the current ones in Mounjaro first-month offers, and the always-sorted master grid lives on our homepage price table.
Cheapest Mounjaro UK FAQ
What is the cheapest Mounjaro in the UK right now?
For the 2.5 mg starter pen, Chemist4U is cheapest at £122 for four weekly doses, followed by Pharmacy2U at £124.99 and The Weight Clinic at £125 with code NEWME (checked 4 July 2026). For the ongoing 5 mg pen, Click2Pharmacy is cheapest at £173.99. Prices change often, so confirm on the provider's own site before ordering.
Why is the advertised price lower than what I'll pay later?
Because 14 of the 24 providers we track discount your first box only. The advertised figure is usually a starter promo on the 2.5 mg pen, which you hold for just four weeks before stepping up to 5 mg. From month two the ongoing (non-promo) price applies, which is why we rank both.
Is the cheapest provider always the best choice?
Not necessarily. A provider a few pounds cheaper on the starter pen might be dearer at 5 mg and above, charge for delivery, or offer no clinical follow-up. Our pick, The Weight Clinic, sits third-cheapest on the first month while including monthly video reviews and a refund if a prescriber declines — value that a bare price column can't show.
How much cheaper is Mounjaro with a discount code?
It depends on the code. ASDA Online Doctor's WNLC10A takes £10 off a first order; The Weight Clinic's NEWME takes £35 off, bringing the 2.5 mg starter pen from £160 down to £125. Codes are applied at checkout and are the most reliable saving on offer.
Can I get Mounjaro cheaper than the prices listed here?
Within regulated channels, the low-£120s is roughly the current floor for a first month. Anything dramatically cheaper is a red flag for an unregulated or "compounded" seller, which we never list and strongly advise against. Mounjaro is a prescription-only medicine — a qualified prescriber decides whether it is appropriate for you.
Ready to start? The Weight Clinic is where we'd send a friend
You could shave a few pounds off with the bare-bones cheapest pharmacy. But for most people starting Mounjaro, The Weight Clinic is the better deal all in: £125 for the 2.5 mg starter pen with code NEWME (down from £160), £185 ongoing, needles and next-day delivery included, monthly video reviews with a clinician, and a refund if a prescriber decides it isn't right for you. Confirm the current price on their site before ordering.
Mounjaro is a prescription-only medicine and isn't suitable for everyone. This is price information, not medical advice.