Searching for a 'Monzo' weight loss injection? Here's what the UK actually offers

Step 1, Getting the name right (and why it matters for safety)

The confusion between "Monzo" and "Mounjaro" is understandable. Phonetically they are close, and people searching for weight-loss injections often arrive at the name via word of mouth rather than reading a leaflet. Mounjaro is tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy is semaglutide, a single GLP-1 agonist. Both are manufactured under strict pharmaceutical standards and supplied through the licensed UK supply chain.

Getting the name right matters beyond accuracy. Counterfeit weight-loss pens have been seized in the UK in significant volumes, the MHRA has warned publicly about fake pens sold via social media and unknown websites, some containing insulin rather than the stated medicine. Knowing the correct brand name, and where to verify the pharmacy supplying it, is part of staying safe. The only legal route to these medicines is a prescription issued after a genuine clinical assessment.

If someone told you about a "Monzo jab" or a Monzo injection for weight loss, they almost certainly meant Mounjaro. The rest of this page treats them as the same query.

Step 2, Understanding how these injections work in practice

Both medicines mimic gut hormones released after eating. That signals the brain to reduce hunger, slows the rate at which the stomach empties food into the small intestine, and (in the case of tirzepatide) also activates the GIP receptor, which plays a separate role in fat metabolism and insulin sensitivity. The result, for most people, is a meaningful and sustained reduction in appetite.

Injections are given once weekly, subcutaneously (just under the skin), into the abdomen, thigh or upper arm. You rotate the injection site each week to avoid tissue build-up. Each Mounjaro KwikPen contains four weekly doses; Wegovy comes as individual pre-filled pens. Treatment starts at a low starter dose (2.5mg for tirzepatide) which exists to settle your system rather than drive immediate weight loss; the prescriber increases the dose in steps over several months, depending on how you respond and tolerate it. For a fuller overview of the injection experience, including what to expect in the early weeks, the weight-loss injections guide covers that in detail.

The NHS tirzepatide page gives a patient-level summary of the medicine, including common side effects and what to do if you miss a dose, it is worth reading before you start.

Step 3 (Checking whether you're likely to be eligible

UK licensing for both Mounjaro and Wegovy covers adults with a BMI of 30 or above, or 27 or above if you have at least one weight-related health condition) things like high blood pressure, type 2 diabetes, high cholesterol or obstructive sleep apnoea. Lower BMI thresholds can apply for some ethnic backgrounds under UK guidance. BMI alone is not a guarantee of approval; a prescriber reviews the full picture, including your medical history, current medicines and any contraindications.

Neither medicine is licensed for people under 18, and both are not recommended during pregnancy, while breastfeeding, or if you are actively trying to conceive. Women taking oral contraceptives starting tirzepatide should add a non-oral method of contraception for the first four weeks of treatment and for four weeks after each dose increase, because the pill's absorption may be reduced during that period, a detail worth flagging to your GP or prescriber.

If you want to understand what the clinical criteria look like in practice and how they are assessed, the treatment overview page walks through the consultation process at nume. For context on what different treatment options involve, the weight-loss treatment comparison is a useful starting point.

Step 4 (What legitimate access through a regulated pharmacy looks like

A regulated online pharmacy will ask for photo ID, verify your weight (at nume this is done on a live video call) not self-reported), and have your answers reviewed by a named GPhC-registered Independent Prescriber on the same day. That prescriber reads your consultation, not software. If approved, the prescription is issued and your treatment is dispatched the same day for free next-working-day delivery via DPD, in plain packaging.

You can verify any online pharmacy on the GPhC register at pharmacyregulation.org, nume's premises registration number is 9012878. That link is publicly searchable and takes about thirty seconds to check. It is worth doing before you hand over payment details to any pharmacy you have not used before.

One practical note: if you are ordering a first prescription and want it dispatched the same day, placing your consultation before noon gives the prescriber time to review it and the pharmacy time to process and dispatch before the last DPD collection. After the school run is typically fine; mid-afternoon, less so on busy days.

Cost is a fair question too. Private injectable weight-loss treatment is not cheap, and prices vary between providers by dose and service level. The one-month injection cost guide explains the range honestly, including what headline prices often exclude. At nume, one transparent price covers the consultation, prescription, treatment and delivery, no subscription, no hidden charges. If you want to discuss your situation with a clinician before committing, our contact page has direct support options. For clinical team information, our lead prescriber's profile is there to read.

If you are taking ADHD medication alongside any weight-loss treatment, there are specific considerations worth discussing at consultation, the guide on injections and ADHD medication covers what is currently known.