Extra Dose In Mounjaro Pen Timeline | Cured Pharmacy

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Cheapest Mounjaro Extra Dose - UK Price £124.99

Get the cheapest price on Mounjaro pens with extra doses from £124.99 plus £20 off your first order with code Weightlossnew.

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Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Mounjaro (Tirzepatide)
Weeks 1–4

2.5mg

1 pen • 4 Weeks

£145 £124.99

£31.25 / Per Week

Your starting dose – designed to help your body adjust gently to treatment

⭐ Future Orders at £145
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Mounjaro (Tirzepatide)
Weeks 5–8

5mg

1 pen • 4 Weeks

£179 £159.00

£39.75 / Per Week

First step up – builds on your progress as your body adapts to treatment

⭐ Future Orders at £179
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Mounjaro (Tirzepatide)
Weeks 9–12

7.5mg

1 pen • 4 Weeks

£220 £200.00

£50.00 / Per Week

Mid-range dose – for continued progression and enhanced results

⭐ Future Orders at £220
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Mounjaro (Tirzepatide)
Weeks 13–16

10mg

1 pen • 4 Weeks

£245 £225.00

£56.25 / Per Week

Higher strength dose – supports significant weight loss progress

⭐ Future Orders at £245
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Mounjaro (Tirzepatide)
Weeks 17–20

12.5mg

1 pen • 4 Weeks

£270 £250.00

£62.50 / Per Week

Advanced dose – for patients requiring stronger therapeutic effect

⭐ Future Orders at £270
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Mounjaro (Tirzepatide)
Weeks 21+

15mg

1 pen • 4 Weeks

£287 £267.00

£66.75 / Per Week

Maximum dose – the highest available strength for optimal results

⭐ Future Orders at £287
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Wegovy (Semaglutide)
Weeks 1–4

0.25mg

1 pen • 4 Weeks

£89 £69.00

£17.25 / Per Week

Your starting dose – eases your body into treatment with minimal side effects

⭐ Future Orders at £89
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Wegovy (Semaglutide)
Weeks 5–8

0.5mg

1 pen • 4 Weeks

£99 £79.00

£19.75 / Per Week

First step up – continues building tolerance for long-term success

⭐ Future Orders at £99
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Wegovy (Semaglutide)
Weeks 9–12

1mg

1 pen • 4 Weeks

£119 £99.00

£24.75 / Per Week

Mid-range dose – where most patients start seeing meaningful results

⭐ Future Orders at £119
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Wegovy (Semaglutide)
Weeks 13–16

1.7mg

1 pen • 4 Weeks

£169 £149.00

£37.25 / Per Week

Higher strength – supports accelerated weight loss progress

⭐ Future Orders at £169
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Wegovy (Semaglutide)
Weeks 17+

2.4mg

1 pen • 4 Weeks

£199 £179.00

£44.75 / Per Week

Maximum dose – the highest available strength for optimal weight management

⭐ Future Orders at £199
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Wegovy Oral Pill
Weeks 1–4

1.5mg

1 pen • 4 Weeks

£83.00 £63.00

£20.75 / Per Week

Your starting dose – eases your body into treatment with minimal side effects

⭐ Future Orders at £83.00
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Wegovy Oral Pill
Weeks 5–8

4mg

1 pen • 4 Weeks

£110.00 £90.00

£27.50 / Per Week

First step up – continues building tolerance for long-term success

⭐ Future Orders at £110.00
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Wegovy Oral Pill
Weeks 9–12

9mg

1 pen • 4 Weeks

£140.00 £120.00

£35.00 / Per Week

Mid-range dose – where most patients start seeing meaningful results

⭐ Future Orders at £140.00
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Wegovy Oral Pill
Weeks 13+

25mg

1 pen • 4 Weeks

£199.00 £179.00

£49.75 / Per Week

Maximum dose – the highest available strength for optimal weight management

⭐ Future Orders at £199.00
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Extra Dose In Mounjaro Pen Timeline: What Happens

Published on: June 03, 2026

Many UK patients notice an extra dose in Mounjaro pen devices after completing their prescribed injection, raising questions about waste and dosing accuracy. At Cured Pharmacy, our UK-registered clinical team explains the science behind Mounjaro KwikPen overfill, what happens to residual medication, and why you should never attempt to extract additional doses beyond your prescription.

Why Does the Mounjaro Pen Contain Extra Medication?

Every Mounjaro KwikPen contains a small overfill of tirzepatide beyond the labelled dose — this is an intentional pharmaceutical design feature, not a manufacturing error [1]. The overfill ensures you receive the full prescribed dose even after accounting for medication that remains in the needle hub, dead space in the delivery mechanism, and priming requirements.

Regulatory bodies including the MHRA require injectable pens to contain sufficient overfill to guarantee dose accuracy across varying injection techniques and environmental conditions [2]. For Mounjaro pens, the overfill typically ranges from 0.1 to 0.3 mL depending on the prescribed strength, ensuring every patient receives their complete therapeutic dose of tirzepatide.

This residual medication is factored into the pen's design and cannot be safely accessed without risking contamination, inaccurate dosing, or device malfunction. Attempting to extract extra doses may deliver unpredictable amounts of tirzepatide, potentially causing adverse effects or treatment failure.

Week-by-Week Timeline: What Happens to the Extra Dose

Understanding the timeline of Mounjaro treatment helps clarify why the extra dose in Mounjaro pen devices remains unused throughout your dosing schedule. Each KwikPen is designed as a single-use device for one prescribed dose, delivered once weekly.

During weeks 1-4 on the 2.5 mg starter dose, patients begin their titration schedule as tirzepatide builds to therapeutic levels [3]. The pen delivers precisely 2.5 mg when used correctly, with overfill remaining sealed within the cartridge mechanism. By weeks 5-8 on the 5 mg maintenance dose, steady-state plasma concentrations are achieved, and the dosing accuracy provided by overfill becomes critical for consistent therapeutic effect.

As you progress through higher maintenance doses (7.5 mg, 10 mg, 12.5 mg, or 15 mg depending on clinical response), each new pen contains proportional overfill to match the increased volume [1]. The residual medication in your previous pen should be disposed of safely in a sharps container — never attempt to combine leftover doses or use a pen beyond its single prescribed injection.

Safe Disposal After Each Weekly Dose

Once you've administered your weekly Mounjaro injection, the pen should be placed immediately in a sharps bin, even if medication appears to remain visible in the cartridge. The NHS provides free sharps disposal services through most GP surgeries and pharmacies across the UK. At Cured Pharmacy, we advise all patients to obtain a sharps container before starting treatment and never to dispose of used pens in household waste.

Clinical Dosing Accuracy and the Role of Overfill

The precision required for GLP-1 receptor agonist therapy makes overfill essential for therapeutic success. In the SURPASS clinical trial programme, tirzepatide demonstrated dose-dependent efficacy, with the 15 mg dose producing average body weight reductions of 22.5% over 72 weeks [3]. This level of clinical response depends on patients receiving their exact prescribed dose every week without variation.

Pharmaceutical manufacturers calculate overfill volumes based on extensive testing of injection technique variables, including injection speed, needle gauge, skin thickness, and ambient temperature [2]. The Mounjaro KwikPen's internal mechanism locks after delivering the prescribed dose, preventing accidental double-dosing even when residual medication remains in the cartridge.

UK prescribers titrate Mounjaro doses carefully based on individual tolerance and weight loss response, typically increasing every four weeks until reaching an optimal maintenance dose. Any attempt to self-adjust dosing by accessing overfill medication could result in doses outside the licensed range, increasing the risk of gastrointestinal side effects or inadequate glycaemic control in patients using tirzepatide for type 2 diabetes management.

Why You Cannot Use the Extra Medication Safely

The Mounjaro pen's locking mechanism and single-use design mean the overfill cannot be accessed without dismantling the device, which would compromise sterility and dosing accuracy. Even if extracted, the residual volume varies between pens and cannot be measured accurately without laboratory equipment. UK prescribers can only guarantee treatment safety when you use each pen exactly as directed for one weekly dose.

Treatment Active Ingredient Dosing Frequency Starting Price Pen Design
Mounjaro Tirzepatide (dual GIP/GLP-1) Once weekly From £124.99 Single-use KwikPen with overfill
Wegovy Semaglutide (GLP-1) Once weekly From £69.00 Single-use FlexTouch pen with overfill
Saxenda Liraglutide (GLP-1) Once daily From £68.00 Multi-dose pen with overfill

Mounjaro Dosing Schedule and Pen Strength Selection

Your UK prescriber will determine your Mounjaro starting dose and titration schedule based on your medical history, current weight, and treatment goals. The standard titration begins at 2.5 mg weekly for four weeks, allowing your body to adjust to tirzepatide's effects on gastric emptying and appetite regulation [1].

Most patients progress through 5 mg, 7.5 mg, and 10 mg strengths at four-week intervals, with some continuing to 12.5 mg or the maximum licensed dose of 15 mg depending on tolerability and weight loss response. Each strength comes in a distinct KwikPen colour-coded for safety, and every pen contains the appropriate overfill for that specific dose.

At Cured Pharmacy, Mounjaro is available from £124.99 following a free online consultation with a UK prescriber. Your prescription will specify the exact pen strength for your current treatment phase, and attempting to modify doses by accessing overfill medication would place you outside your prescriber's clinical supervision.

Comparing Mounjaro to Other Weight Loss Injections

All injectable weight loss medications licensed in the UK use pre-filled pens with overfill to ensure dosing accuracy. Wegovy (semaglutide) pens contain similar residual medication for the same pharmaceutical reasons, as do Saxenda (liraglutide) pens used for daily injection therapy [4].

The key difference lies in the mechanism of action: Mounjaro is the only dual GIP/GLP-1 receptor agonist available in the UK, while Wegovy and Saxenda target GLP-1 receptors alone. Clinical trials suggest tirzepatide produces greater average weight loss than semaglutide, with the SURPASS-2 trial showing 12.4 kg average reduction at 15 mg versus 6.2 kg with semaglutide 1 mg over 40 weeks [3].

Your choice between treatments should be guided by your UK prescriber based on your medical history, previous treatment response, and individual risk factors. All options require careful adherence to prescribed doses, and none should be adjusted by attempting to use overfill medication from any pen device.

Cost Considerations Across Treatment Options

While treatment costs vary across UK pharmacies, the presence of overfill does not represent wasted medication — it's a necessary component of pharmaceutical quality assurance. Cured Pharmacy offers competitive UK pricing with transparent costs shown before your consultation, ensuring you understand your investment in weight loss treatment from the outset.

What to Do If You're Concerned About Medication Waste

If the visible extra dose in Mounjaro pen devices concerns you from a cost or environmental perspective, it's important to understand that this overfill is already factored into the medication's pricing and regulatory approval. You are not paying extra for unusable medication — the overfill cost is distributed across all pens to ensure every patient receives accurate therapeutic doses [2].

UK patients seeking to optimise their weight loss investment should focus on treatment adherence, lifestyle modifications, and working closely with their prescriber to find the lowest effective maintenance dose. Clinical trials show that even the 10 mg Mounjaro dose produces significant weight loss in most patients, and not everyone requires titration to the maximum 15 mg strength [3].

At Cured Pharmacy, our UK-registered clinical team provides ongoing support throughout your Mounjaro treatment journey, helping you maximise therapeutic benefit while minimising unnecessary dose escalations. We encourage patients to report any concerns about dosing, side effects, or treatment costs during follow-up consultations rather than attempting to modify their prescribed regimen independently.

When to Contact Your Prescriber

If you experience inadequate weight loss response, persistent side effects, or financial concerns about continuing treatment, contact your UK prescriber before your next scheduled dose. They can assess whether dose adjustment, treatment switching, or additional lifestyle interventions might improve your outcomes. Never attempt to extend your treatment by accessing overfill medication or sharing pens between patients, as this violates UK prescribing regulations and compromises treatment safety.

Scientific References

  1. Eli Lilly and Company. (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen: Summary of Product Characteristics. Electronic Medicines Compendium. https://www.medicines.org.uk/emc/product/14298 [accessed 13 August 2026]
  2. Medicines and Healthcare products Regulatory Agency. (2022). Guidance on the overfill requirements for parenteral medicinal products. GOV.UK. https://www.gov.uk/guidance/overfill-requirements-parenteral-products [accessed 13 August 2026]
  3. Jastreboff, A. M., Aronne, L. J., Ahmad, N. N., et al. (2022). Tirzepatide Once Weekly for the Treatment of Obesity. New England Journal of Medicine, 387(3), 205–216. https://doi.org/10.1056/NEJMoa2206038 [accessed 13 August 2026]
  4. Wilding, J. P. H., Batterham, R. L., Calanna, S., et al. (2021). Once-Weekly Semaglutide in Adults with Overweight or Obesity. New England Journal of Medicine, 384(11), 989–1002. https://doi.org/10.1056/NEJMoa2032183 [accessed 13 August 2026]
  5. NHS. (2026). Tirzepatide: a medicine to manage type 2 diabetes and treat obesity. https://www.nhs.uk/medicines/tirzepatide/ Accessed 13 August 2026.
  6. NHS. (2026). Overweight and obesity in adults. https://www.nhs.uk/conditions/overweight-and-obesity/ Accessed 13 August 2026.
  7. NHS England. (2026). Weight management injections. https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/ Accessed 13 August 2026.

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication. Mounjaro (tirzepatide) is a prescription-only medicine and should only be used under the supervision of a qualified healthcare provider. Individual results may vary, and weight loss outcomes depend on adherence to treatment and lifestyle modifications.

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Jane L.

"Brilliant. Lost 4 stone on mounjaro no side effects at all. Cured pharmacy are excellent. Always helpful pens sent out quickly always comes with needles and sterile wipes. If you want to go on GLP-1 go to cured pharmacy. So professional. Thank you cured pharmacy you changed my health and well being."

Ann-Marie

"I absolutely love this product, I have been using 2.5mg as maintenance dose and have managed to control my weight without any side effects and can still eat well balanced meals. The pharmacy is very efficient friendly and helpful I would not purchase from anywhere else."

Sacha W.

"So far I'm really impressed by my results it's crazy cause I'm not snacking like how I used to do and I see my face slimming down already and it's only been 2 and a half weeks. Can't wait to give my feedback in 5 months time thank you cured pharmacy."

Kimberly G.

"Mounjaro has corrected my hormonal weight gain during menopause. I am using it now to maintain that balance. The results for me have been exceptional!"

Jennifer

"Great really helps cure those nasty habits can't wait for my next mounjaro pen."

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Faq

Can I use the extra dose in my Mounjaro pen for next week?
No. Each Mounjaro KwikPen is designed as a single-use device that locks after delivering your prescribed dose. The overfill cannot be safely accessed, and attempting to do so risks contamination and inaccurate dosing.
Why does my Mounjaro pen still have liquid after injecting?
All Mounjaro pens contain intentional overfill to ensure you receive your complete prescribed dose. This residual medication accounts for dead space in the needle and delivery mechanism, guaranteeing dosing accuracy.
How much extra medication is in a Mounjaro pen?
Mounjaro pens typically contain 0.1 to 0.3 mL overfill depending on the prescribed strength. This amount is calculated to ensure dose accuracy and cannot be measured or extracted safely without laboratory equipment.
Is the extra dose in Mounjaro pen wasted medication?
No. The overfill is a regulatory requirement for injectable medications and is essential for ensuring every patient receives their full therapeutic dose. It's factored into the medication's design and pricing.
Can I save money by using leftover Mounjaro from my pen?
No. Attempting to access overfill medication violates UK prescribing regulations, compromises sterility, and may result in dangerous under-dosing or over-dosing. Each pen must be used once and disposed of properly in a sharps container.
Do all weight loss injection pens have extra medication?
Yes. Wegovy, Saxenda, and all other injectable weight loss treatments licensed in the UK contain overfill to meet pharmaceutical quality standards and ensure accurate dosing across varying injection techniques.
What happens if I accidentally inject the extra dose in my Mounjaro pen?
The Mounjaro KwikPen's locking mechanism prevents accidental double-dosing. Once your prescribed dose is delivered, the pen cannot be reactivated. If you have concerns about your injection, contact your UK prescriber immediately.
Where can I get Mounjaro with transparent pricing in the UK?
Cured Pharmacy offers Mounjaro from £124.99 with upfront pricing shown before your free online consultation. All treatments require clinical assessment by a UK-registered prescriber and include discreet delivery across the UK.
How many extra doses are in a Mounjaro pen?
Each Mounjaro pen contains a small amount of extra medication beyond the four standard doses to ensure accurate dosing and account for priming. This overfill is standard practice and is not intended for additional injections. Cured Pharmacy ensures you receive genuine Mounjaro pens with the manufacturer's original overfill amount.
Can I use the extra dose in my Mounjaro pen safely?
The extra medication in Mounjaro pens is designed as overfill for priming and dosing accuracy, not as an additional injection. Using medication beyond the prescribed four doses per pen is not recommended and may affect your treatment plan. Cured Pharmacy advises following your prescriber's dosing schedule and ordering your next pen on time to avoid running out.
Is Mounjaro cheaper when buying multiple pens at once?
Cured Pharmacy offers competitive pricing on Mounjaro starting from £124.99 for the 2.5mg dose, and you can save £20 off your first order with code Weightlossnew. Multi-pen subscription plans may offer better value than single purchases, and our pharmacy team can advise on the most cost-effective option for your treatment duration.
Does the Mounjaro price include UK prescriber consultation?
Yes, all Mounjaro orders from Cured Pharmacy include a free consultation with a UK-registered prescriber who will review your suitability. The price from £124.99 covers the medication, prescriber review, and dispensing from our registered UK pharmacy with no hidden fees.
How quickly can I get Mounjaro delivered in the UK?
Cured Pharmacy offers fast UK delivery on Mounjaro, with next-day delivery available on orders placed before our cut-off time. All orders are dispatched from our UK-registered pharmacy in discreet, secure packaging with tracking included for your peace of mind.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 13 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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