Mounjaro Is Made by Which Company? (October 2026)

01 · The answer

Who makes Mounjaro?

Eli Lilly makes Mounjaro. Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly. In the UK it is licensed for weight management in adults and for type 2 diabetes. It comes as a pre-filled multi-dose pen (KwikPen) in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹

Lilly discovered tirzepatide, runs the clinical trials, holds the brand and supplies the finished pens into the UK.

If you are asking because you want to know whether the pen in your hand is real, the maker matters a great deal. The page on the company behind Mounjaro covers Lilly itself.

02 · Your next step

Does the manufacturer change what you should do?

Not for most people. The maker is Lilly whichever UK pharmacy dispenses your pen, so the choice between providers comes down to supply route, clinical oversight, service and price rather than who manufactured it.

If you are considering treatment, the sensible path is a consultation with a GPhC-registered prescriber who can check whether tirzepatide is suitable for you. You can read about our weight loss clinic or see how the Mounjaro pen is priced; for a first order the starter pen is £129.99 with code FIRST40 (standard price £169.99).

Related guides: Is pharmacy to you mounjaro made in uk and Weight loss injections company.

03 · Eli Lilly and tirzepatide

Eli Lilly and tirzepatide: who owns what

Eli Lilly owns the Mounjaro brand and developed tirzepatide, the active ingredient. Lilly is a large pharmaceutical company based in the United States, with a long history in diabetes medicines. Mounjaro is its most prominent obesity and diabetes product in the UK.

Ownership matters for a practical reason. Because Lilly is the sole manufacturer, there is no generic tirzepatide on the UK market. Anything sold as cheaper tirzepatide, or as a compounded or research version, did not come through Lilly's licensed supply chain. Treat it with real caution.

Mounjaro is the brand name for tirzepatide, made by Eli Lilly, and supplied as a KwikPen.¹ The patient information leaflet in the box carries the same details.¹³

04 · Brand names for tirzepatide

What are the brand names for tirzepatide?

In the UK, tirzepatide is sold under the brand name Mounjaro. That is the only UK brand for the molecule, and Lilly is the only company that makes it.

You may see tirzepatide sold under other brand names in other countries. What matters for a UK reader is that Mounjaro is licensed here for weight management in adults and for type 2 diabetes.¹

Because the same company makes the medicine for different indications, a pen is the same pen whichever reason it is prescribed for. What differs is the prescribing decision: who it is suitable for, the dose, and how treatment is reviewed. Those decisions belong to a prescriber, not to the brand.

05 · Maker versus pharmacy

Manufacturer versus pharmacy: who does what

The manufacturer makes the medicine; the pharmacy checks the prescription, dispenses it and delivers it.

EverydayMeds sits in the pharmacy row. We are a GPhC-registered online pharmacy (registration 9012878), and our supply is official LillyDirect: Mounjaro direct from Eli Lilly's UK distribution, genuine KwikPens, with all six doses stocked. We never manufacture or repackage the medicine.

Pharmacies differ on price, service and aftercare, but not on who made the pen. If you are comparing providers, see our page on the cheapest company for Mounjaro for how to read those differences.

06 · Spotting genuine Mounjaro

How to be sure your Mounjaro is genuine

Genuine Mounjaro comes through a registered pharmacy that dispenses it against a prescription. Counterfeit and unlicensed tirzepatide products have been the subject of MHRA alerts, and the regulator runs the Yellow Card scheme for reporting suspected problems.⁷

Check the seller on the pharmacy register before you buy. The GPhC public register lists registered pharmacies, and you can look up ours with our registration number, 9012878.¹²

Warning signs are easy to list. Be wary of anyone offering to supply without a consultation or prescription, of sellers describing tirzepatide as a research chemical, and of anyone who promises specific results. Real Mounjaro is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber.

The pen itself is a KwikPen in one of six strengths, and it arrives with a patient information leaflet. If a product does not match that description, do not use it, and ask the pharmacy or your prescriber.

07 · How the Lilly medicine works

What Lilly's medicine actually does

Mounjaro works on two gut-hormone pathways at once. Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin.¹

In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet. This dual action is what distinguishes Mounjaro from single-action medicines such as semaglutide (Wegovy and Ozempic), which are made by a different company.

Lilly's headline weight-loss trial is SURMOUNT-1. In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone. These are trial averages — individual results vary, and treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.²

08 · Mounjaro and the NHS

Is Lilly's Mounjaro available on the NHS?

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first (initially BMI 40+ with four or more qualifying conditions).⁴⁶

Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting. The manufacturer is the same either way. Lilly supplies the NHS and private pharmacies with the same licensed product.

If you are not sure which route fits you, ask your GP about NHS eligibility first, then compare private options if you do not qualify yet or the wait is too long.

09 · Stopping and clearance

How long does tirzepatide stay in the body?

Tirzepatide stays in the body for some weeks after a final dose. It has a half-life of about five days, so after a final dose it takes roughly four to five weeks to clear the system. There is no way to speed this up, and nothing needs doing while it clears.¹

Questions about stopping, changing dose or switching medicine should go to your prescriber. Our team provides ongoing monthly reviews, dose titration and follow-up assessments, and repeat orders re-check suitability. There is no auto-shipping.

Mounjaro (tirzepatide) is a prescription-only medicine, used alongside a reduced-calorie diet and increased physical activity. Individual results vary. This page is information, not a substitute for medical advice.