Tirzepatide Pen UK — Pre-Filled Tirz Peptide Quick Pens
Looking for where to buy a Tirz pen in the UK (also searched as a "Triz pen" or tirzepatide pen)? Peptides UK 4U supplies Tirz as a pre-filled Quick Pen in 20mg, 40mg and 60mg — reconstituted under sterile conditions in our UK facility, cold-shipped, and delivered ready-to-use the next working day. No mixing, no bac water measuring, no syringe maths.
Every batch of tirzepatide is independently HPLC tested at 99%+ purity, and every pen ships with a clicks-per-mg card calibrated to your chosen strength. Same-day UK dispatch before 1pm. Supplied for in vitro research only — not for human use.
How to order your tirzepatide Quick Pen
- Open the Tirzepatide product page.
- Choose your strength — 20mg, 40mg or 60mg.
- Select the Pen format. The price updates to one all-in figure — pen, reconstitution and bacteriostatic water included, no separate add-on.
- Checkout. We prepare and refrigerate your pen and dispatch the same working day on orders before 1pm.
Tirzepatide pen clicks & units chart
On a standard 3mL dial-a-dose pen, one click = 0.01mL = 1 insulin unit. What that click is worth in mg depends on the pen's concentration:
| Pen strength | Bac water | Per click | 2.5mg | 5mg | 7.5mg |
|---|---|---|---|---|---|
| 20mg | 2mL | 0.10mg | 25 clicks | 50 clicks | 75 clicks |
| 40mg | 3mL | 0.133mg | ≈19 clicks | ≈38 clicks | ≈56 clicks |
| 60mg | 3mL | 0.20mg | 12.5 clicks | 25 clicks | ≈38 clicks |
Your pen ships with a printed card matching the exact strength you ordered. Double-check any figure in our free reconstitution calculator.
How to use a tirzepatide pen
- Attach a needle — screw on a fresh 31G 6mm pen needle and remove both caps.
- Prime — dial 1–2 clicks and press until a droplet appears at the tip to clear air.
- Dial the dose — set the clicks shown on your supplied clicks-per-mg card.
- Dispense — press the plunger fully and hold for 10 seconds before withdrawing.
- Store — remove and dispose of the needle, re-cap, and refrigerate at 2–8°C.
Full step-by-step tirzepatide pen guide
For the complete walkthrough — clicks-per-mg by strength, priming, how long a pen lasts and troubleshooting — read our How to Use a Tirzepatide Pen (UK guide). Prefer full control over concentration and a lower cost per mg? See tirzepatide vials.
Tirzepatide 20mg, 40mg or 60mg — which pen strength?
All three vial sizes can be prepared as a pre-filled pen. The right choice depends on how long you want a single pen to last and the dose range you're working with:
- 20mg pen — best for shorter research windows or lower-dose protocols; the most forgiving click resolution.
- 40mg pen — the most popular UK pen strength; a solid middle ground on cost-per-mg.
- 60mg pen — longest-lasting pen for higher-dose or extended protocols; fewest refills.
Full compound background is in the Tirzepatide UK guide.
Vials vs pens at a glance
Both formats deliver the same peptide compound — the difference is in the experience. Vials give you full flexibility but require reconstitution, syringes and manual dosing. Pre-filled Quick Pens arrive ready to use with built-in dose selection.
Cold-shipped, next-day UK delivery
Pens ship in insulated cold packaging via Royal Mail Tracked 24 from our UK facility. Order before 1pm on a working day for same-day dispatch. No customs delays, no overseas waiting times, no warm transit. Delivery is fully tracked with photo confirmation, in plain discreet packaging.
Storage & handling
- Refrigerate the pen at 2–8°C between uses.
- Keep out of direct light.
- Do not shake — reconstituted tirzepatide is stable but sensitive to agitation.
- Never freeze a reconstituted pen.
- Once reconstituted, generally treated as stable for around 4 weeks.
Purity, testing & COAs
- Independently HPLC tested at 99%+ purity.
- Lyophilised in sealed, tamper-evident vials before reconstitution.
- Batch Certificates of Analysis published openly on the site.
- Prepared in the UK — no overseas repackaging.
Quick Pen vs the Mounjaro KwikPen — what's the difference?
People often search for a "tirzepatide KwikPen" or "Mounjaro KwikPen", so it is worth being clear about what is what. Mounjaro and KwikPen are registered trade marks of Eli Lilly and Company. Peptides UK 4U is not affiliated with, endorsed by or connected to Eli Lilly, and we do not sell Mounjaro or any licensed medicine.
| Mounjaro KwikPen | Our Tirz Quick Pen | |
|---|---|---|
| What it is | Licensed prescription medicine (Eli Lilly) | Reusable research device, filled in our UK lab |
| Intended use | Human therapeutic use under prescription | In vitro laboratory research only |
| Device | Single-dose disposable pen | Reusable dial-a-dose pen; £12.99 refill cartridges |
| How you get it | Registered prescriber and pharmacy | Ordered online for research use, UK stock |
In short: the KwikPen is a medicine, our Quick Pen is a research device. We make no claim of equivalence between the two. For In Vitro Use Only — Not for Human Use.
Tirzepatide cost per mg — pen vs vial
| Strength | Pen price | Pen £/mg | Vial price | Vial £/mg |
|---|---|---|---|---|
| 20mg | £124.99 | £6.25 | £90 | £4.50 |
| 40mg | £174.99 | £4.37 | £140 | £3.50 |
| 60mg | £204.99 | £3.42 | £170 | £2.83 — best value |
Cost per mg falls as the fill gets larger, and a lyophilised vial is always the cheaper route because you do the reconstitution. See Tirzepatide vials UK for reconstitution tables and how long each vial lasts.
Other pre-filled pens
We also prepare Retatrutide pens, Semaglutide pens, and pens for the wider range. Already have a pen? Add a pre-filled cartridge refill instead.
Browse related products
View full shopFrequently asked questions
Where can I buy a Tirz pen in the UK?
Peptides UK 4U supplies tirzepatide (Tirz) as a pre-filled Quick Pen from our UK facility. Open the Tirzepatide product page, choose your strength (20mg, 40mg or 60mg) and select the Pen format for one all-in price — we reconstitute it under sterile conditions with bacteriostatic water, cold-pack it and dispatch the same working day if you order before 1pm. For In Vitro Use Only — Not for Human Use.
What is a Tirz pen?
A Tirz pen (also spelled Triz pen) is short-hand for a tirzepatide Quick Pen — it is a standard dial-a-dose injection pen pre-loaded with reconstituted tirzepatide. Each pen is prepared in a controlled UK environment at a set concentration, so the clicks-per-mg are already calibrated when it reaches you — no mixing, no measuring bacteriostatic water, no syringe maths.
How many clicks per mg on a tirzepatide pen?
On a standard 3mL dial-a-dose pen, one click equals 0.01mL. With a 40mg vial in 3mL of bacteriostatic water (13.33mg/mL), one click is about 0.133mg, so 2.5mg is roughly 19 clicks. Every pen we dispatch ships with a clicks-per-mg card calibrated to the exact strength you ordered.
How do you use a tirzepatide pen?
Screw on a fresh pen needle, prime the pen with 1–2 clicks until a droplet appears, dial the number of clicks for your target dose from the supplied card, hold the pen against the site, press the plunger fully and hold for 10 seconds before withdrawing. Remove and dispose of the needle after each use, and refrigerate the pen between uses.
How many units is 2.5mg of tirzepatide?
It depends on the concentration in the pen. At 10mg/mL (20mg in 2mL), 2.5mg is 25 units or 25 clicks. At 13.33mg/mL (40mg in 3mL) it is about 19 units. At 20mg/mL (60mg in 3mL) it is 12.5 units. Cross-check any figure with our free reconstitution calculator.
What strengths of tirzepatide pen do you sell?
We stock tirzepatide in 20mg, 40mg and 60mg vials, and all three can be prepared as a pre-filled Quick Pen. The 40mg is our most popular pen strength for UK researchers because it balances cost-per-mg with a sensible pen concentration.
Tirzepatide pen or vial — which is better?
The peptide is identical; only the format differs. A vial gives maximum dosing flexibility but needs bacteriostatic water, sterile technique and syringe maths. A pen arrives ready to dose with calibrated clicks, making it faster to start and easier to store and travel with.
How is the tirzepatide pen shipped in the UK?
Pens ship in insulated cold packaging via Royal Mail Tracked 24 for next-day delivery. Orders placed before 1pm on a working day are dispatched the same day from our UK premises — no customs delays and no warm transit.
How long does a tirzepatide pen last once opened?
Once reconstituted, tirzepatide should be kept refrigerated at 2–8°C and is generally treated as stable for around 4 weeks. Keep the pen away from direct light, never freeze it and never shake it.
Do I need needles for the tirzepatide pen?
Yes — the pen uses standard screw-on pen needles. We recommend 31G 6mm needles and stock them on-site so you can add a pack at checkout.
Is it legal to buy a tirzepatide pen in the UK?
Tirzepatide is legal to purchase and possess in the UK for laboratory research purposes only. It is not a licensed medicine and is not intended for human or animal use. For In Vitro Use Only — Not for Human Use.
What is the Mounjaro pen called?
The Eli Lilly tirzepatide product Mounjaro is supplied in the UK either as a single-dose KwikPen (a pre-filled disposable pen) or as single-use vials. KwikPen and Mounjaro are registered trade marks of Eli Lilly and Company. Peptides UK 4U is not affiliated with, endorsed by or connected to Eli Lilly, and our Quick Pen is a separate reusable research device — not a Mounjaro KwikPen and not a medicine.
Is a tirzepatide Quick Pen the same as a Mounjaro KwikPen?
No. A Mounjaro KwikPen is a licensed prescription medicine manufactured by Eli Lilly for human use. Our tirzepatide Quick Pen is a refillable research device we fill with reconstituted research-grade tirzepatide in our UK facility, supplied strictly for in vitro laboratory research — not for human use. The two are not interchangeable and we make no claim of equivalence.
Can I get a tirzepatide KwikPen without a prescription?
No — the Mounjaro KwikPen is a prescription-only medicine in the UK and can only be obtained through a registered prescriber and pharmacy. What we supply is research-grade tirzepatide, pre-filled into a reusable Quick Pen device for laboratory research use only.
Is tirzepatide a peptide?
Yes. Tirzepatide is a synthetic 39-amino-acid peptide that acts on both the GIP and GLP-1 receptors. We supply tirzepatide peptide in the UK as lyophilised research vials, or pre-filled into a Quick Pen, strictly for in vitro laboratory research.
Where can I buy tirzepatide peptide in the UK?
Peptides UK 4U holds tirzepatide peptide in UK stock in 20mg, 40mg and 60mg vials, each available as a plain vial or as a pre-filled Tirz pen. Every batch is HPLC tested at 99%+ purity with a batch-matched Certificate of Analysis, and orders before 1pm dispatch the same working day.
How much is a tirzepatide pen in the UK?
Pen pricing is the vial price plus the Quick Pen preparation, shown as one all-in figure when you select the Pen format — from £124.99 for the 20mg Tirz pen. There is no separate add-on to buy and bacteriostatic water is included.
Disclaimer: All products sold by Peptides UK 4U are for laboratory and research purposes only. They are not intended for human or animal consumption, diagnosis, treatment or prevention of any disease.