Mounjaro Click Dosage Chart: How the KwikPen Dose Really Works (November 2026)

01 · The core answer

Is there an official Mounjaro click chart?

No official click chart exists for Mounjaro, and you do not need one. The KwikPen is set by turning the dose knob until the dose indicator shows the correct dose in the window. You confirm the dose by the number in the window, never by counting clicks.¹³

Unofficial charts and calculators circulate online, often built around splitting a pen into smaller amounts. The KwikPen is not designed for splitting, so charts of that kind are not a safe guide. Our own dose per click guide and the click chart PDF page explain the same position in more detail.

Clicks are simply the mechanical feedback as the dial turns. They are not a measuring scale you can rely on, and the clinical instructions never ask you to use them as one.

02 · What to do next

What to check instead of counting clicks

Check three things before every injection: the strength printed on your pen, the number in the dose window, and that the pen turned to a full dose. If all three match your prescription, you have the right dose.

That table is the real chart: the strength is a property of the pen, and the pen is built to deliver that full dose. For a wider view, see our Mounjaro dosage chart and the pen dosage chart.¹

Ready to start or switch? The Mounjaro pen starts at a standard price of £169.99 for the 2.5mg pen, and all six doses are in stock. Treatment follows a free consultation reviewed by a GPhC-registered prescriber. For wider support, our weight loss clinic page explains the aftercare.

03 · How the pen dial works

How the Mounjaro pen dial works

The Mounjaro KwikPen is set by turning the dose knob until the dose indicator shows the correct dose in the window. Because each pen is a fixed strength, a full dose is simply the dose the pen is designed to deliver, and the window tells you when you are there.¹³

Each pen contains four weekly doses; the pen will not let you dial past the medicine left inside. This is a safety feature. It means the pen itself stops you drawing up more than remains, so you do not need to track clicks to avoid overdosing across the month.¹³

Mounjaro is a pre-filled multi-dose pen (KwikPen) in six strengths. The strength you hold is the strength you were prescribed, which is why the dose window, not a click tally, is your check.¹

Always follow the instructions in the leaflet supplied with your pen. They cover attaching the needle, dialling, injecting and what to do afterwards, and they are the only dosing steps that apply to your device.

04 · Why counting clicks is risky

Why counting clicks is risky

Counting clicks to portion out a dose is not part of the licensed use of the pen, and it risks a dosing error. A miscounted turn, a distraction, or a slightly different feel between pens can leave you with an amount nobody has checked.

"Microdosing" — taking smaller or more spread-out doses than the pen is designed to deliver — is not licensed, not supported by the pen's design and not endorsed by any UK regulator. Altering doses outside the licence means unknown dosing accuracy and no safety data.¹

If side effects are the worry, there is a safer route. The licensed dose ladder already starts low (2.5mg) for tolerability, and your prescriber can hold a dose longer or step down within the licence if side effects are the concern.¹ Our dose splitting chart page covers the same position.

Wegovy pens are a different device with their own instructions, and click counts there do not transfer to Mounjaro. If you are comparing, our Wegovy click dosage chart guide covers that pen separately.

05 · The licensed dose ladder

The licensed dose ladder

Everyone starts Mounjaro on 2.5mg once a week. This starting dose is about letting your body adjust, not about weight loss itself.¹

After at least 4 weeks the dose increases to 5mg, and can then step up by 2.5mg at a minimum of 4-week intervals (7.5mg, 10mg, 12.5mg) up to a maximum of 15mg weekly, depending on how you respond and tolerate it. Many people settle at a maintenance dose of 5mg, 10mg or 15mg — higher is not automatically better, and your prescriber will guide the right pace.¹¹¹

Because each step is a new pen, you never change dose by dialling differently. You change dose by receiving the next strength. The same applies to a click chart for any specific strength, for example the 7.5mg click chart or a 10mg week-by-week guide. In each case the answer is the same: the pen of that strength delivers that dose, and the window confirms it.

Treatment response is reviewed by your prescriber. If you have lost less than 5% of your starting weight after 6 months on the highest dose you can tolerate, your prescriber will discuss whether continuing or stopping is right for you.¹

06 · If the pen will not dial

If the pen will not dial to a full dose

If the window will not turn to a full dose, the pen does not contain enough for one and should not be used for a partial injection. This is the clearest rule on the whole topic, and it is the situation where people are most tempted to reach for a click chart.¹³

Do not top up from a second pen, and do not inject what is left and guess the shortfall. Contact the pharmacy or your prescriber and explain what the window showed. If the pen is faulty, damaged or the wrong item, tell us within 3 days of delivery so we can sort it out.

You can report any suspected problem with a medicine or device through the MHRA Yellow Card scheme.¹⁹

07 · Injection timing and missed doses

Injection timing, missed doses and changing day

Mounjaro is injected under the skin (subcutaneously) once a week, on the same day each week, at any time of day, with or without food. Rotate the site with each dose.¹³

If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time, then carry on with your usual day. If more than 4 days have passed, skip the missed dose entirely and take the next one on your normal day — never take two doses within 3 days of each other.¹³

You can change your weekly injection day if needed, as long as at least 3 days (72 hours) have passed since your last dose.¹³

None of these rules involve clicks. They all work from the full dose the pen delivers.

08 · Storing an in-use pen

Storing your pen between doses

Keep Mounjaro pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept out of the fridge at a temperature not above 30°C for up to 30 days after first use — useful for short trips — and must then be thrown away. Do not use a pen that has been above 30°C or has been frozen. Keep the pen cap on to protect it from light, and never use a pen that has been frozen.¹³

Storage matters for dosing too. A pen that has been frozen or left in heat is not one to rely on, whatever the window shows. If you are unsure, ask the pharmacy before injecting.

09 · Switching pens and doses

Moving between pens or providers

If you are moving from another provider, bring the strength on your current prescription and let the prescriber review it. New customers save £40 on their first order with code FIRST40, and an automatic £25 reorder discount applies to every future order (code DOSE25).

Our injection dosage chart and price chart help you line up strength and cost before you decide. For a Wegovy comparison, see Wegovy 1.7mg versus Mounjaro.

10 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹