Mounjaro 2.5mg Price Compared Across Every UK Provider

Before you can even think about Mounjaro's headline weight-loss numbers, you have to get through month one — and month one always means the 2.5 mg starter pen. It's the same dose, the same pack size and the same four weekly injections everywhere, yet the price you'll actually pay ranges from £122 to £229. This is our full mounjaro 2.5mg price comparison across every regulated UK provider we track, checked on 24 August 2026.

The 2.5 mg dose is a starter dose only — it's there to let your body adjust before you move up to a treatment-level dose like 5 mg. That matters for the maths below, because a lot of the cheapest-looking prices are one-off promotions rather than what you'll pay long-term.

Mounjaro 2.5mg price comparison: the full grid

Below is every provider we track for the 2.5 mg starter dose, showing both the standard four-weekly price and the discounted first-month price where one applies.

Prices last checked 01 September 2026. All 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.

Why the 2.5mg price isn't the whole story

The 2.5 mg dose is deliberately low. It exists to let your digestive system adjust before you move to 5 mg, which is the first proper treatment dose, and from there potentially up to 7.5, 10, 12.5 or 15 mg over several months. So the price you pay in month one might bear no relation to what you'll pay from month two onwards.

A provider offering a big first-month discount can look like the cheapest option on paper, then revert to a higher standard price once you're a few weeks in. It's worth checking the ongoing 5 mg and above prices too — we've laid those out fully in our Mounjaro price comparison by dose, and compared how subscriptions stack up against one-off orders in Mounjaro subscription vs one-off.

If you'd rather see the whole market ranked by overall value rather than just the starter dose, our cheapest Mounjaro UK ranking pulls together first-month and ongoing prices side by side. You can also check the live table on our homepage price comparison at any time, since prices do shift month to month.

Reading first-month offers properly

Fourteen of the providers above discount the 2.5 mg box specifically to win new customers, and the size of the discount varies wildly — from a few pounds off to over £70 off at Voy. That's a genuine saving if you were going to start anyway, but it shouldn't be the only factor. We go into which of these offers represent real value versus which just look flashy in Mounjaro first-month offers: which are real value?.

Our recommended provider, The Weight Clinic, sits mid-table on list price but jumps to third-cheapest first month with code NEWME (£125 instead of £160). It's also worth knowing that they offer a refund if a prescriber assesses you and decides Mounjaro isn't suitable, plus monthly video reviews to check in on how treatment is going — details worth having regardless of which provider you choose.

What actually drives the £83 spread

It's the same tirzepatide pen everywhere, made by the same manufacturer, so the price gap comes down to business model rather than product quality: pharmacy overheads, prescriber consultation costs, marketing spend and how aggressively each provider discounts to win first-time customers. We unpack this in more detail in why Mounjaro prices vary by £80+ for the same pen, but the short version is: a higher price doesn't mean a better or safer product, and a lower price doesn't mean a corner has been cut, provided the provider is GPhC-registered or CQC-regulated.

Eligibility and safety come first

Price comparisons are only useful once you know you're eligible. Mounjaro is a prescription-only medicine, and every provider listed here requires a consultation with a prescriber who decides whether it's suitable for you — typically for adults with a BMI of 30 or above, or 27 and above with a weight-related condition. Nothing in this article is medical advice, and no provider can guarantee a prescription will be issued.

Common side effects include nausea, diarrhoea, constipation, vomiting and tiredness, particularly while your dose is being increased. More serious but rarer risks include pancreatitis, gallstones, dehydration and low blood sugar if combined with certain diabetes medicines. If you experience a side effect on any medicine, you or your pharmacist can report it via the MHRA's Yellow Card scheme.

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