Mounjaro Click Chart: mg per Click by KwikPen Strength

1. Choose the strength printed on your KwikPen.
2. Choose "My full dose" to get the pen’s own instruction and the dates of its four doses, "An amount in mg" to see it in clicks on the unofficial 60-click count, or "Which dose is next" if you have already started the pen.
3. For an amount, read what one click would be worth, how many doses that count gives, and how many of them fall before the pen must be thrown away. Add what you paid to see the cost of each usable dose next to the lower-strength pen.
4. Add the date of your first dose to print the pen plan, save it as an image or put the doses and the discard date in your calendar.

The UK Instructions for Use set a dose one way: you turn the dose knob until it stops and the dose icon shows in the window. That icon "is equal to a full 0.6 ml dose" (Mounjaro KwikPen Instructions for Use, step 11). The only clicks the leaflet mentions are the 2 you hear when you turn the knob to the prime position in step 7. The US Mounjaro KwikPen Instructions for Use say "Do not count clicks as you select the dose" (US Mounjaro KwikPen Instructions for Use, step 11). For Ozempic and Wegovy pens, see the Ozempic and Wegovy click chart.

Lilly Canada adds that it cannot make any recommendations on splitting a KwikPen dose, because splitting has not been studied (Lilly Canada). The UK SmPC and patient leaflet give no click count either (Mounjaro KwikPen SmPC; patient leaflet). The MHRA approved the four-dose KwikPen on 25 January 2024 as a pen "covering a month’s treatment" (MHRA announcement). Priming and the dose icon are explained in what the clicks on a KwikPen mean.

Every KwikPen strength holds four 0.6 mL doses in 2.4 mL, so the six pens differ only in concentration (Mounjaro KwikPen SmPC, sections 2 and 6.5). The concentration is the dose ÷ 0.6 mL, and one click on the 60-click assumption is the dose ÷ 60.

Because 15 ÷ 2.5 = 6, the same number of clicks would carry six times as much tirzepatide on the 15 mg pen as on the 2.5 mg pen. A click count copied from someone else only becomes an amount once you know which pen it was counted on.

Online charts price a part dose as a share of 60 clicks. The table repeats that arithmetic for each pen, and the KwikPen has no setting for any of these amounts.

On the 10 mg pen, 15, 30 and 45 clicks would give 2.5, 5 and 7.5 mg, and each of those doses already has its own KwikPen. On the 2.5, 7.5 and 12.5 mg pens, none of the three amounts is a licensed dose; the ladder starts at 2.5 mg and rises in 2.5 mg steps (Mounjaro KwikPen SmPC, section 4.2).

The patient leaflet says: "A small amount of medicine may remain in the pen after all doses have been correctly given. Do not try to use any remaining medicine." (Mounjaro KwikPen patient leaflet, section 3).

A part dose leaves medicine in the cartridge that the dose window cannot show; if the knob then will not turn as far as the dose icon, read what the clicks on a KwikPen mean before your next dose.

A pen also has a date after which it is thrown away, however much is left in it. The UK SmPC allows it to be kept unrefrigerated for up to 30 days after its first use, and then it must be discarded (Mounjaro KwikPen SmPC, section 6.4). The US labels for the Mounjaro and Zepbound KwikPens say to throw the pen away 30 days after first use or after 4 weekly doses, "even if there is medicine left in it" (Mounjaro prescribing information, section 16.2; Zepbound prescribing information, section 16.2).

Compounded click-dosing pens are different: the pen’s own instructions give the click size. Clicks = dose in mg ÷ concentration in mg/mL × 100 ÷ units per click. The pen stops only at whole clicks: at 30 mg/mL and 1 unit per click, 2.5 mg is 8.3 clicks, and the 8 clicks the pen can deliver hold 2.4 mg. For these pens, use the compounded tirzepatide pen click calculator.

Mounjaro starts at 2.5 mg once a week and goes up to 5 mg after 4 weeks. Any later increase is a 2.5 mg step after at least 4 weeks on the current dose, and the adult maintenance doses are 5, 10 and 15 mg, with 15 mg the maximum (Mounjaro KwikPen SmPC, section 4.2). The dose titration planner puts those steps on a calendar.

A missed dose can still be given within 4 days. After that, skip it and inject on your usual day, keeping at least 3 days between any two doses (Mounjaro KwikPen SmPC, section 4.2). The missed dose guide works out the dates. If 5 mg stops holding your appetite before the next injection, moving to 7.5 mg is your GP’s or prescriber’s decision; what they weigh up is set out in food noise coming back on 5 mg Mounjaro.