Hunting for a Mounjaro new customer offer? You're in the right place. Nearly every UK pharmacy dangles a first-month discount or welcome code to win your business — but some "offers" are worth far less than the sticker suggests once the ongoing price kicks in. This guide walks through the new-customer deals genuinely worth taking in 2026, and the ones that quietly cost you more over the following months.
Key takeaway: A new-customer offer only matters if the ongoing price is also competitive. A £30 first-month saving is wiped out in month two if you then pay £40 more than a rival every four weeks. Compare the long game, not just the welcome price.
Why Mounjaro new-customer offers exist
Mounjaro (tirzepatide) is a prescription-only medicine, and dozens of UK-regulated pharmacies now compete to dispense it. Because most people start on the 2.5 mg dose and stay with the same provider for months, winning you as a new customer is valuable. That's why you'll see first-month prices, welcome codes and money-off vouchers aimed squarely at newcomers.
The catch: almost every promo applies only to the 2.5 mg starter dose — which you take for just four weeks. The 2.5 mg dose isn't even a treatment dose; it's there to ease your body in and reduce side effects. So a headline first-month saving is a one-off, and the price that really shapes your spend is what you pay from 5 mg onwards.
The best Mounjaro new-customer offers right now
Here are notable new-customer deals from UK-regulated providers, checked on 25 August 2026. Every one below is a GPhC-registered pharmacy or CQC-regulated clinic dispensing genuine brand Mounjaro after an online consultation.
| Provider | New-customer deal | First month (2.5mg) | Ongoing (2.5mg) |
|---|---|---|---|
| Chemist4U | Code NEW26 | £122 | £148 |
| Pharmacy2U | First-month intro | £124.99 | £169.99 |
| The Weight Clinic | Code NEWME (£35 off) | £125 | £160 |
| Oxford Online Pharmacy | Code W2TM539S | £128.96 | £143.96 |
| ZAVA | Code START40 | £129.99 | £169.99 |
| ASDA Online Doctor | Code NWFG30 | £118.97 | £148.97 |
| Voy | First-month intro | £139 | £214 |
| LloydsPharmacy Online Doctor | Code START40 | £149.99 | £179.99 |
Notice the pattern: Voy's £139 first month looks tempting, but the ongoing price jumps to £214 — the priciest ongoing 2.5 mg rate we track. Oxford Online Pharmacy, by contrast, pairs a low £128.96 first month with a genuinely competitive £143.96 ongoing price. That's the kind of offer worth taking.
Our recommended provider's offer
The Weight Clinic is our recommended provider, and its new-customer offer is one of the more honest ones going. The code NEWME takes £35 off your first order, bringing 2.5 mg down to £125 for month one. The ongoing prices are fair across the range — £185 at 5 mg, £260 at 10 mg and £295 at 15 mg — so you're not stung once the welcome discount ends.
Two extra reasons we rate it as a new-customer choice: you get a refund if the prescriber declines your consultation, so there's no risk in applying, and there are monthly video reviews to check your progress and dose. Those touches matter more than shaving a few pounds off month one.
How to judge whether an offer is actually good
Run any new-customer deal through these quick checks before you commit:
1. Add up three months, not one
Take the first-month price plus two months of the ongoing price. A £122 first month at Chemist4U followed by two months at £148 is £418. Compare that with your realistic alternative. The winner is rarely the one with the flashiest single-month headline.
2. Check the offer covers the dose you'll be on
Most codes only touch 2.5 mg. Since you climb through 5 mg and often settle at 10 mg for the long haul, the ongoing price at those doses is what you'll actually live with.
3. Confirm the provider is UK-regulated
A cheap offer means nothing if the seller is dodgy. Stick to GPhC-registered pharmacies and CQC-regulated clinics. Any "offer" with no prescription required, or an unregulated "compounded" version, is a red flag — walk away. Our guide on whether cheap Mounjaro is safe shows exactly how to spot the difference.
4. Read the code's small print
Some welcome codes need a minimum order, some auto-apply, some expire. Our verified discount codes guide lists which currently work and where.
Try our recommended provider: The Weight Clinic — use code NEWME for £35 off your first order (2.5 mg from £125). Full refund if the prescriber decides Mounjaro isn't right for you, plus monthly video reviews. Prices from £160/4 weeks ongoing.
Don't forget the year-one maths
A new-customer offer saves you money once. The dose you settle on saves — or costs — you money every month for a year or more. Because Mounjaro is titrated slowly (2.5 mg, then 5, 7.5, 10, 12.5, up to a maximum 15 mg), your monthly bill changes as you go. To see realistic totals, use our year cost planner and browse the live homepage price table. For this month's headline bargains across all doses, see our roundup of the cheapest Mounjaro deals, and for legitimate longer-term savings read our six legit ways to pay less.
A word on suitability and side effects
Mounjaro is MHRA-licensed for weight management and recommended by NICE (TA1026). Private access is generally for adults with a BMI of 30+, or 27+ with a weight-related condition, but a prescriber makes the final call — no legitimate provider offers "guaranteed approval". Common side effects include nausea, diarrhoea, constipation, vomiting and tiredness; rarer serious effects include pancreatitis and gallstones. Report any suspected side effect through the MHRA Yellow Card scheme. This article is price and information only, not medical advice.
Frequently asked questions
What is the best Mounjaro new customer offer in the UK?
It depends on the ongoing price, not just the first month. Oxford Online Pharmacy pairs a £128.96 first month with a low £143.96 ongoing rate, and Chemist4U offers £122 for month one with code NEW26. Our recommended provider, The Weight Clinic, gives £35 off with code NEWME (£125 first month) plus a refund if declined. Always confirm the live price on the provider's own site.
Do new-customer offers apply to every dose?
Usually not. Most first-month deals and welcome codes only apply to the 2.5 mg starter dose, which you take for just four weeks. The ongoing price at 5 mg and above is what shapes your real spend, so compare that too.
Is a cheap first-month offer a sign the medicine is fake?
No — provided the provider is UK-regulated. Every provider in our table is a GPhC-registered pharmacy or CQC-regulated clinic dispensing genuine brand Mounjaro after a consultation. What's not legitimate is any seller offering Mounjaro with no prescription or an unregulated "compounded" version.
Can I switch providers to keep getting new-customer discounts?
Some people do move to chase first-month deals, but continuity of care matters with a titrated medicine. Switching means a fresh consultation each time and can complicate dose tracking. Often a provider with a fair ongoing price beats repeatedly hopping for one-off savings.
What happens if the prescriber declines me after I've paid?
Reputable providers refund you if the prescriber decides Mounjaro isn't suitable. The Weight Clinic, for example, offers a refund if declined. No legitimate service promises guaranteed approval — a clinician always reviews your suitability first.
How do I check a discount code actually works?
Read the code's terms for minimum spend and expiry, and apply it at checkout before paying. Our verified discount codes guide lists which UK codes currently work and which doses they cover.