How Many ml in a 7.5mg Mounjaro Pen? (October 2026)

01 · The short answer

What the 7.5mg on your Mounjaro pen actually means

The 7.5mg is the amount of tirzepatide you inject once a week, not the size of the pen. Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly, supplied as a pre-filled multi-dose KwikPen in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ Each KwikPen contains four weekly doses.¹³

So a 7.5mg pen is a pen designed to give four injections of 7.5mg, one a week, over four weeks. The pen does the measuring for you.

That is why the question "how many ml" rarely matters in practice. You are never asked to draw up a volume, read a syringe or convert milligrams to millilitres. You turn the dose knob until the window shows your dose, and inject.

02 · The ml figure

The honest answer on millilitres

Read the label on the pen in your hand and the patient information leaflet in the box.¹³

Whatever the volume, the treatment is defined by the strength in mg and set on the dial. For the 7.5mg dose in ml, see the 7.5mg dose expressed in ml.

03 · Cost

What a 7.5mg Mounjaro pen costs

A 7.5mg pen is £279.99 per month, or £70.00 per week, at our standard price, and all six doses are in stock. You can see live prices on the Mounjaro pen product page. Prices were checked 10 October 2026.

New customers save £40 on their first order at any dose with code FIRST40, including people switching to us from another provider at 7.5mg. An automatic £25 reorder discount then applies to every future order (code DOSE25).

For context, across the UK pharmacies we track, the cheapest and dearest Mounjaro pens at any dose run from £143.96 to £339.00 per month (checked 10 October 2026). The gap between providers for the same dose ranges from £27 to £41, so comparing is worthwhile. Starting from 2.5mg? See the 2.5mg injection price page.

What the price includes: the consultation is free, the price shown is the price paid with no hidden fees, and delivery is free next-day tracked in discreet, temperature-controlled packaging. Needles, a sharps bin and injection guidance come with every order. Mounjaro is supplied through official LillyDirect supply, direct from Eli Lilly's UK distribution. You can pay by Visa, Mastercard or Klarna, with pay-monthly options and no subscription.

04 · How to order

How ordering works

Ordering takes three steps: payment is taken when you place the order, and if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

• Free online consultation. A short health questionnaire, no charge, no obligation. Start your free consultation.
• Prescriber review. A GPhC-registered prescriber reviews your answers. Unsuitable orders are refunded automatically.
• Dispensing and delivery. Our registered pharmacy dispenses your pen, with same-day dispatch when ordered by 3pm and free next-day tracked delivery. Saturday delivery is £14.99.

Repeat orders re-check suitability, and nothing ships automatically. Our team supports monthly reviews and dose changes.

05 · Dose versus volume

Dose versus volume: why mg is what matters

Milligrams measure how much tirzepatide you receive; millilitres measure how much liquid carries it. For a pre-filled pen, only the first is something you ever act on. The licensed strengths run from 2.5mg to 15mg, and the dose you are prescribed is described in mg.¹

This is different from some other injectables. Daily liraglutide, for instance, is supplied at 6mg per millilitre, which makes volume a more visible part of that product's labelling. Mounjaro is a once-weekly pen, and the device handles the conversion, so you do not need a calculator, a syringe or a conversion chart.

It also explains why two pens with different strengths can look almost identical on the bench. The pen body, the dial and the number of weekly doses are the same design; what changes is the strength you are prescribed. Always check the strength printed on the label before your first injection from a new pen, and confirm it matches your prescriber's instructions.

Our page on 0.6 ml Mounjaro covers common mix-ups. A frequent one is confusing 7.5mg with 7.5 ml. They are completely different quantities, and the pen is never dosed in ml.

06 · Dial and clicks

How the dial works and why you should not count clicks

You set the Mounjaro KwikPen 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 This answers a question we see often: how many clicks for 5mg from a 7.5mg pen? There is no click count to use. If you are prescribed 5mg you should have a 5mg pen, not a 7.5mg pen dialled back.

Dialling a different dose from a pen of another strength, or trying to approximate a dose by clicks, is not licensed and not how the pen was designed. Each pen contains four weekly doses, and the pen will not let you dial past the medicine left inside.¹³ Our walkthrough of how to use the 7.5mg KwikPen covers the steps from unboxing to disposal.

"Microdosing", meaning 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.

07 · How much is left

How much is left in the pen after four doses

After four weekly injections the pen is finished. The pen is built to deliver four doses; do not try to extract more.¹³

The pen includes a safeguard. It will not let you dial past the medicine left inside, and 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.¹³

Plan your repeat order ahead of the fourth injection. Our team handles repeat orders, re-checks suitability each time, and nothing is auto-shipped, so you stay in control of timing.

08 · Moving between doses

Where 7.5mg sits on the dose ladder

7.5mg is the third step of the Mounjaro ladder. Everyone starts on 2.5mg once a week, which is about letting your body adjust rather than weight loss itself. 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 response and tolerance.¹

Many people settle at a maintenance dose of 5mg, 10mg or 15mg, and higher is not automatically better. Your prescriber guides the pace.

In SURMOUNT-1, a 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.² Individual results vary.

For a fuller description of this strength, see the Mounjaro 7.5mg pen guide. If you are moving to 7.5mg, review how you tolerate the dose with your prescriber rather than rushing the steps.

09 · Storage and travel

Storing your 7.5mg pen

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 not above 30°C for up to 30 days, useful for short trips, after which it should be discarded.¹ Keep the cap on to protect the pen from light, and never use a pen that has been frozen.

You can fly with Mounjaro. Carry pens in hand luggage, because hold luggage can fall below freezing, ideally in a cool bag with the prescription label or a copy of your prescription. For hot climates, use an insulated pouch, and check destination rules for prescription injectables before you fly.¹³

Unopened pens should be kept in the fridge and keep until the expiry date printed on the box. If an unopened pen has been out of the fridge, check with the pharmacy before using it rather than relying on a remembered day limit; figures circulating online often come from other countries' labels.

10 · Ingredients and new pens

Ingredients, newer pens and what to avoid

The active ingredient is tirzepatide; the full list of other ingredients is in the patient information leaflet in the box, so use that rather than a summary.¹³ The leaflet is also the place to check allergy information.

Rely on the leaflet and label that arrive with your own pen, and ask the pharmacy if something looks different from what you expected. The strength in mg and the four-dose design are what you verify.

As for what to avoid, the leaflet and your prescriber are the right source for your own medicines and conditions. Do not alter doses, do not buy from sellers offering to supply without a consultation or prescription, and tell your prescriber about any new symptoms. You can report suspected side effects through the MHRA Yellow Card scheme.¹⁹

Our guide to the Mounjaro prefilled pen covers the device in more detail.

11 · Injecting and missed doses

Injecting, timing and missed doses

Mounjaro is injected under the skin once a week, on the same day each week, at any time of day, with or without food. Licensed sites are the stomach area (at least 5cm from the belly button), the front of the thigh, or the back of the upper arm if someone else gives the injection. Rotate the site with each dose.¹³ There is no best time of day. What matters is picking a day and time you will remember.

If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time. If more than 4 days have passed, skip it and take the next one on your normal day. Never take two doses within 3 days of each other. You can change your injection day as long as at least 3 days (72 hours) have passed since your last dose.¹

Follow the pen's instructions for how long to hold it in place after pressing the button.

12 · Buying safely

Buying a genuine pen

Buy Mounjaro only from a pharmacy you can verify on the register. EverydayMeds is GPhC-registered (9012878), and you can check the GPhC register entry yourself.¹² Mounjaro must not be used during pregnancy, and it should be stopped at least one month before trying to conceive. Our pens are genuine KwikPens through official LillyDirect supply.

The MHRA publishes counterfeit medicine alerts, so be wary of any seller offering to supply without a consultation or prescription.⁷ Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber, and used alongside a reduced-calorie diet and increased physical activity. Individual results vary. This page is information, not a substitute for medical advice.

On eligibility, Mounjaro is licensed for weight management in adults with a BMI of 30 or above, or a BMI between 27 and 30 with at least one weight-related condition.¹ Mounjaro is also available on the NHS, but access is being phased in over several years, and the primary-care rollout began in June 2025 with the highest-need groups first.⁴ You can browse all weight loss treatments too.