The Mounjaro Click Chart Explained: NHS Doses and How the KwikPen Works

Step 1: Understanding what the click chart actually shows

The Mounjaro KwikPen is designed around a fixed-dose mechanism. When you press the injection button, the pen delivers one pre-set dose and produces a click (or a series of clicks, depending on the version) that lets you know the full dose has been administered. The NHS click chart, distributed through specialist weight management services and GP practices participating in the tirzepatide rollout, sets out which pen colour corresponds to which dose strength and what the click confirmation looks like for each.

UK strengths run from 2.5 mg at the start of treatment through 5 mg, 7.5 mg, 10 mg, 12.5 mg and up to 15 mg. Each strength comes in its own distinctively coloured pen. The chart exists because patients using a four-dose pen across a month need to track which injection they are on, and because some people find the tactile click more reassuring than reading a dose window. It is worth spending a minute before your first injection simply holding the pen, locating the dose window, and pressing the cap against a surface to feel the click mechanism — familiarity before you inject makes the process calmer.

For the precise number of clicks and the exact injection steps for your specific pen, the NHS tirzepatide medicines page walks through the process in plain language and links to the Patient Information Leaflet, which remains the authoritative reference for technique.

Step 2: How the titration schedule sits behind the chart

The click chart does not tell you which dose you should be on. That decision belongs to your prescriber, and it follows a structured titration process. Treatment begins at 2.5 mg for the first four weeks, a period whose purpose is giving your digestive system time to adjust, not producing weight loss. After that, the prescriber typically moves the dose up in 2.5 mg steps at roughly four-week intervals, based on how you are tolerating the current strength.

This matters because some patients spend longer at a given dose if side effects are noticeable, and moving up too quickly generally worsens gastrointestinal symptoms like nausea, indigestion and loose stools. The chart helps you recognise which pen you have been prescribed; it does not set the timeline. NICE's appraisal of tirzepatide (TA1026) notes that if a patient loses less than 5% of their body weight after six months at the highest tolerated dose, continuing treatment should be reviewed. That kind of monitoring sits entirely with the prescriber, informed partly by the dose record the click chart helps patients keep accurately.

If you are exploring what private treatment looks like alongside or instead of the NHS route, the Mounjaro cost comparison page sets out how pricing works across providers, including what a legitimate price covers.

Step 3: Checking your pen is from the licensed UK supply chain

A practical habit worth building: before every injection, check that the pen's expiry date is valid and that the solution in the dose window is clear and colourless. Cloudy, discoloured or particulate liquid is a reason not to inject and to contact your pharmacy.

This matters more than it might seem. The MHRA has warned publicly about counterfeit tirzepatide pens appearing in the UK, including a 2025 raid on an illicit manufacturing site in Northampton producing fake pens. Genuine Mounjaro enters the UK through Eli Lilly's authorised distribution network. If you sourced a pen from a social media seller, a site that supplied it without a clinical consultation, or a price that looked unusually low, the MHRA's Yellow Card scheme at yellowcard.mhra.gov.uk is the right place to report it. Genuine pens, from a GPhC-registered pharmacy, carry a lot number traceable back through that chain.

You can check any online pharmacy (including ours) against the GPhC register at pharmacyregulation.org/registers. A legitimate pharmacy will always have a verifiable registration; one that cannot be found there should not be supplying prescription medicines.

NHS access vs. private routes: where the click chart fits each

On the NHS, the click chart tends to be shared at the point of dispensing by a specialist weight management service or, increasingly, by a GP practice participating in the tirzepatide primary-care rollout that began in 2025. The NHS Mounjaro access page covers current eligibility thresholds in detail, including the phased BMI and comorbidity criteria that determine which cohort a patient falls into. Criteria are strict, and waiting times vary significantly by area.

For people who do not currently meet NHS criteria, or who would rather not wait, a private prescription from a regulated online pharmacy is the legal alternative. At a private weight-loss clinic or a GPhC-registered online service, the same KwikPen is prescribed and the same click chart applies, there is no separate private-route pen. The medicine is identical; what differs is the access pathway, the waiting time, and who covers the cost.

Across both routes, the click chart is ultimately a practical aid for confident self-injection. It does not replace the conversation with your prescriber about whether your current dose is right. If you have questions about which dose you are on, why it was chosen, or when the next increase might come, those are conversations for the clinician who issued your prescription, not something to interpret from the chart alone. You can find more about what private prescribing looks like through the guide to getting Mounjaro across both NHS and private routes, or read about buying Mounjaro through a regulated online pharmacy if that is the path you are considering.

If you are travelling and wondering whether you can fulfil your Mounjaro prescription abroad, there are important legal and practical considerations worth understanding before you travel. Speak to our prescribers through a free consultation, reviewed the same day by a real clinician, with no algorithm involved.