When to Order Your Next Mounjaro Pen (UK Timing Guide, November 2026)

01 · The short answer

When should you order your next Mounjaro pen?

Order your next pen on the day you inject dose three. Each pen contains four weekly doses¹, so dose three falls about two weeks before you will need the new pen. That gap is deliberately generous, because a reorder is not just a delivery. Repeat orders re-check suitability, and no order is ever auto-shipped.

If you already know your next pen will be a higher strength, the same rule applies. The extra time also gives your prescriber room to ask how you are tolerating the current dose before approving a step up.

If you changed your injection day mid-pen, shift the days to match.

02 · The process

What happens after you place a reorder

A reorder takes three short steps, and the clinical review is the part you cannot rush.

• Complete the free consultation questionnaire. It is short, free and carries no obligation. You can start your free consultation from your account.
• Prescriber review. A GPhC-registered prescriber reviews your answers. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.
• Dispensing and delivery. Orders placed by 3pm are dispatched the same day. Delivery is free, next-day, tracked and temperature-controlled. Saturday delivery is £14.99.

Standard pen prices are £169.99 (2.5mg), £189.99 (5mg), £244.99 (7.5mg), £274.99 (10mg), £289.99 (12.5mg) and £299.99 (15mg). Every order after your first is £25 off the standard price (code DOSE25). You can see current doses and prices on the Mounjaro pen page, where all six doses are in stock. The first-order discount guide explains how that works.

03 · Next strength

Will your next pen be a different dose?

Possibly, and that is a good reason to order early. Everyone starts on 2.5mg weekly. After at least 4 weeks the dose rises to 5mg, then can step up by 2.5mg at minimum 4-week intervals to a maximum of 15mg¹¹¹. Many people settle at 5mg, 10mg or 15mg, and higher is not automatically better. Your prescriber decides the pace based on how you respond and tolerate each dose.

So the pen you order may match your current one or be the next step up. Reply promptly if the prescribing team asks a follow-up question, because that is the commonest cause of a delay. For the broader question of timing across the whole dose ladder, see our guide on when to order your next dose.

04 · Why order two weeks ahead

Why ordering two weeks ahead makes sense

Ordering at dose three protects your weekly schedule from the things you cannot control. Mounjaro is a once-weekly medicine, and its blood levels are designed around a 7-day cycle¹. A pen arriving late is therefore not a minor inconvenience, because it can mean a skipped injection.

Four things can eat into your time:

• The clinical review. A prescriber checks suitability on every repeat order.
• Dispatch cut-off. Same-day dispatch applies to orders placed by 3pm. Later orders go out the next working day.
• Weekends and bank holidays. A standard delivery will not arrive on a day couriers do not run, unless you pay for Saturday delivery at £14.99.
• Your own availability. Someone needs to be in, or you need a safe place for the parcel. Temperature-controlled packaging is not a reason to leave a pen outside for hours.

Two weeks costs you nothing. The pen you already have stays in use, and a new one sits in your fridge ready for when you need it.

05 · Already running late

What to do if your pen is nearly empty and the next is not here

If your next pen has not arrived, the missed-dose rule tells you what to do. Take the missed dose 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 that dose entirely and take the next one on your normal day. Never take two doses within 3 days of each other¹¹³.

You can also change your injection day if at least 3 days (72 hours) have passed since your last dose¹. That can help if a delivery lands mid-week and you would rather wait than rush.

If you have already used up your pen, our guide on a finished Mounjaro pen covers what to do with it. If you have missed several weeks, contact the prescribing team before restarting. Do not guess at a dose yourself. Support is available Monday to Friday, 9am to 5pm, on 0333 207 0413 or at support@everydaymeds.co.uk.

06 · Never stretch a pen

Why you should never stretch a pen to cover a gap

Each KwikPen is designed and licensed to deliver exactly four weekly doses. Use the pen as designed, then dispose of it.

07 · Storing a spare pen

How to store the next pen while you wait

Keep the new pen in the fridge at 2–8°C and never freeze it¹. Unopened pens keep until the expiry date printed on the box. The 30-day out-of-fridge allowance only applies once a pen is in use, and then only not above 30°C, after which the pen should be discarded¹¹³.

If a delivery has been left out in warm weather, check with the pharmacy before using it rather than relying on a remembered day limit. Figures circulating online often come from other countries' labels. Keep the cap on to protect the pen from light.

When your parcel arrives, check it before you inject. A genuine UK pen has a batch number and expiry date, arrives cold-chain packaged, and the solution inside is clear and colourless¹³. Do not use a pen that has been frozen, looks cloudy or discoloured, has particles in it, or is past its expiry. If anything seems wrong, contact the pharmacy before injecting. If a pen will not dispense, our guide on how to unjam a Mounjaro pen can help.

08 · Buying safely

Buying your next pen safely

Reordering from the same verified pharmacy every time is the simplest way to avoid fake pens. The MHRA has seized thousands of fake weight-loss pens in the UK and issued alerts after falsified Mounjaro pens were identified. Some fakes contained insulin rather than tirzepatide, and fake pens have caused hospitalisations⁷.

Only buy from a pharmacy you can verify on the GPhC register¹². EverydayMeds is GPhC-registered (9012878) and sources Mounjaro directly from Eli Lilly's UK distribution through official LillyDirect supply. Avoid social media sellers, beauty salons and unverified websites, and anyone offering to supply without a consultation or prescription. Genuine treatment always involves both.

Panic-buying from an unknown seller because your pen ran out is the situation fake suppliers rely on. That is another reason to order at dose three. Sharing a pen with someone else is never a safe workaround either, as our page on sharing a Mounjaro pen explains.

09 · Switching and reviews

Monthly reviews and switching provider

Reorder timing fits neatly into your monthly review. Aftercare at EverydayMeds includes ongoing monthly reviews, dose-titration and follow-up assessments, and side-effect support from the prescribing team. Repeat orders re-check suitability, so your review and your reorder happen together.

If you are switching to us from another provider, tell us your current strength. A new customer gets £40 off their first order at any dose with code FIRST40, and every later order is £25 off the standard price. Complete the consultation a couple of weeks before your current pen ends, as you would for any reorder, so the review is finished before you need the pen.

You are never locked in. There are no subscriptions, nothing ships automatically, and you can pay by Visa, Mastercard, Klarna or pay-monthly options. If you want to browse everything we offer, see all weight loss treatments, or go to the main Buy Mounjaro page to order.

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. It is used alongside a reduced-calorie diet and increased physical activity. Individual results vary. This page is information, not a substitute for medical advice.