When to order your next Mounjaro pen — and how to do it safely

Step 1 — Work out when your pen will run out

Each Mounjaro KwikPen contains four weekly doses, so a single pen covers roughly one month of treatment. The most common reason people run short is simply forgetting to reorder until they're already on their last dose. A practical rule: count four weeks from the day you started your current pen, then subtract five to seven days, and you can read through the full guidance on when you should order your next Mounjaro pen if you want to work through the timing in more detail.

If your treatment has just moved to a higher strength, your prescriber will have confirmed the timing. Dose changes require clinical re-review, and supply of a new strength follows that same review, it doesn't happen automatically. Plan a few extra days' lead time whenever a strength change is involved, and check the guidance on when to order ahead of a dose change if you're unsure.

It's also worth knowing that Mounjaro is a Black Triangle medicine, subject to additional MHRA monitoring. That's a feature of newer medicines, not a safety alarm, but it reinforces why clinical oversight for every supply matters. The NHS tirzepatide information page covers the basics of the medicine's profile if you'd like background reading.

Step 2, Submit your repeat request through a GPhC-registered pharmacy

In the UK, tirzepatide (the active ingredient in Mounjaro) is available only on prescription. That means every repeat order, not just your first, requires a prescriber to review your case and issue a new prescription. There is no legitimate route to this medicine without that assessment taking place, which is why anyone wondering whether it's possible to buy Mounjaro online without a consultation should understand that no regulated UK pharmacy can lawfully supply it that way.

At nume (at nume) the repeat process starts online: a short clinical questionnaire covering your current dose, recent weight, any side effects, and general health. A GPhC-registered Independent Prescriber reads that personally and, if everything looks clinically appropriate, issues your prescription. Our GPhC pharmacy registration number is 9012878, verifiable directly at the GPhC register. That link is worth bookmarking: it's how you check any online pharmacy, not just ours.

If you're transferring from another provider and want to continue treatment, you'll need to supply evidence of your current dose and recent weight. Our prescribers cover that at the consultation stage, there's more detail on how to order Mounjaro through nume.

Step 3, Know what a legitimate order looks like (and what doesn't)

The MHRA has issued repeated warnings about fake weight-loss pens sold online and through social media. In October 2025, enforcement teams raided a site in Northampton producing counterfeit tirzepatide pens; across 2025, around 20 million doses of illegally traded weight-loss medicines (roughly £45m street value) were seized. Some counterfeit pens have contained insulin rather than the stated medicine. The MHRA's guidance is clear: purchase only from a pharmacy you can verify on the GPhC register, and be sceptical of any seller offering Mounjaro without a preceding clinical consultation, or at prices far below the typical market range.

Red flags include: no requirement for a consultation before purchase, prices that seem dramatically lower than others you've seen, and sellers operating only through social media channels. If something feels off, report it via the MHRA's Yellow Card scheme, that applies to suspect sellers as well as suspected side effects.

For more context on safe sourcing, the guide to where to order Mounjaro in the UK covers the full picture of what to look for.

Step 4, What happens after your order is approved

Once a prescriber approves your repeat at nume, orders placed before 12pm Monday to Friday are dispatched the same day. DPD delivers the following working day; you'll receive a tracking link so you can see exactly where your pen is. It arrives in a plain, unmarked box, no logos, nothing on the outside to indicate what's inside.

Inside, you'll find your Mounjaro KwikPen refrigerated correctly for transit, along with any documents relevant to your prescription. Storage after delivery is in the fridge at 2–8°C; for the exact handling details, including any limited room-temperature window, the Patient Information Leaflet inside the box is the definitive source, and next-day Mounjaro delivery at nume has more on the logistics if you need them.

There are no subscriptions here. Every repeat order is a fresh clinical decision. If your circumstances have changed since your last order, the prescriber will catch that, which is the point. Questions about anything in the process can go to our team via the contact page, seven days a week.