Getting The 5th Dose Out Of Your Mounjaro Pen | UK Guide

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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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UK Guide: Getting The 5th Dose Out Of Your Mounjaro Pen

Published on: June 03, 2026

Many UK patients search for how to get 5th dose out of mounjaro pen uk when managing their tirzepatide treatment. Whilst Mounjaro KwikPens are designed to deliver four precise doses, some patients report residual medication remaining after the fourth injection. This comprehensive guide from our UK-registered pharmacists explains the technical considerations, safety implications, and proper techniques for those exploring this option under clinical supervision.

Understanding Mounjaro Pen Design and Dosing

Mounjaro KwikPens are pre-filled, single-patient-use injection devices containing tirzepatide, the first dual GIP/GLP-1 receptor agonist licensed by the MHRA for weight management in the UK [1]. Each pen is engineered to deliver four weekly doses at your prescribed strength — whether that's 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, or 15mg per injection.

The pen mechanism uses a ratchet system that clicks through predetermined dose increments. After four injections, the dose selector typically locks, indicating the pen has delivered its licensed volume. However, the manufacturing process includes overfill — extra medication to account for priming and ensure accurate dosing throughout the pen's lifecycle [2].

This overfill is standard pharmaceutical practice across injectable medications and exists to guarantee you receive the full prescribed dose in each of your four injections. The amount of residual medication varies by dose strength, with lower-dose pens (2.5mg, 5mg) potentially containing more relative overfill than higher-dose pens (12.5mg, 15mg).

The Technical Reality of Extracting a Fifth Dose

When patients ask about getting a 5th dose out of their Mounjaro pen, they're typically referring to manually overriding the dose selector after the fourth injection. The pen's locking mechanism prevents normal dialling once the prescribed doses are exhausted, but some patients have discovered methods to access residual medication.

The critical safety consideration is dose accuracy. Mounjaro's clinical efficacy demonstrated in the SURPASS trials — including average weight reductions of 15-22.5% depending on dose strength — relied on precise, consistent dosing [1][3]. Any fifth dose extracted would be of unknown volume and potentially inconsistent strength, as the pen's calibration system no longer functions beyond its designed capacity.

Additionally, the sterility of residual medication becomes questionable after multiple needle attachments and extended storage periods. Each time you attach and remove a needle, you introduce potential contamination risk, and medication that remains in the pen beyond the intended four-week usage period may degrade in potency or safety.

Regulatory and Clinical Guidance

The MHRA's licensing for Mounjaro specifies usage as directed in the patient information leaflet, which instructs disposal after four doses. Eli Lilly, the manufacturer, has not validated or approved any technique for extracting additional doses beyond the designed four injections. As UK pharmacists, we must advise that any modification to the prescribed usage pattern should only occur under direct guidance from your prescriber.

Your prescriber determines your Mounjaro dosing schedule based on your individual response, tolerability, and weight management goals. If you're experiencing supply difficulties or cost concerns that make you consider extending each pen, the appropriate step is discussing these challenges with your clinical team rather than independently modifying your treatment regimen.

Safety Considerations and Clinical Implications

Attempting to extract a fifth dose carries several clinical risks that patients should understand. First, dosing inconsistency may affect your treatment response — tirzepatide's mechanism of action relies on steady therapeutic levels to effectively regulate appetite and glucose metabolism [1]. Unpredictable dosing could result in inadequate symptom control or unexpected side effects.

Second, the risk of infection increases with improper technique or compromised sterility. Subcutaneous injections must maintain strict aseptic technique, and any contamination can lead to injection site reactions, abscesses, or systemic infection requiring medical intervention.

Third, if you successfully extract a partial fifth dose but it contains less medication than your prescribed strength, you may experience breakthrough hunger, reduced glycaemic control (if you're using Mounjaro for type 2 diabetes), or other symptoms that your regular dose normally manages. Conversely, if the residual medication is more concentrated than expected, you could experience enhanced side effects including nausea, vomiting, or gastrointestinal distress.

When to Contact Your Prescriber

If you're considering extracting additional doses due to financial constraints, speak with your prescriber about alternative solutions. At Cured Pharmacy, Mounjaro starts from £124.99 with transparent upfront pricing, and our clinical team can discuss whether adjusting your treatment plan or exploring alternative weight management options might better suit your circumstances.

You should also contact your healthcare provider if you've already attempted a fifth dose and experience any unusual symptoms, injection site problems, or concerns about treatment efficacy. Your prescriber can assess whether your current regimen requires adjustment and ensure you're achieving optimal outcomes safely.

Treatment Active Ingredient Administration Frequency Starting Price
Mounjaro Tirzepatide Subcutaneous injection Once weekly From £124.99
Wegovy Semaglutide Subcutaneous injection Once weekly From £69.00
Saxenda Liraglutide Subcutaneous injection Once daily From £68.00
Orlistat Orlistat Oral capsule Three times daily From £32.00
Xenical Orlistat Oral capsule Three times daily From £32.00

Alternative Approaches to Managing Mounjaro Costs

Rather than attempting to extend individual pens beyond their designed capacity, several legitimate strategies can help UK patients manage the cost of tirzepatide treatment. Understanding your full range of options ensures you maintain safe, effective therapy whilst addressing financial concerns.

First, ensure you're accessing competitive pricing through registered UK pharmacies. Cured Pharmacy offers Mounjaro from £124.99 with no hidden fees — the price you see during your free online consultation is the price you pay, including UK prescriber assessment and discreet home delivery. We guarantee the lowest prices in the UK for genuine, MHRA-licensed medication.

Second, discuss your dose progression timeline with your prescriber. Mounjaro treatment typically begins at 2.5mg and increases gradually to minimise side effects and optimise response. Some patients achieve their weight management goals at lower maintenance doses (5mg or 7.5mg) rather than escalating to maximum strength, which can reduce long-term costs whilst maintaining clinical benefits [3].

How to Get 5th Dose Out of Mounjaro Pen UK: The Pharmacist's Perspective

As UK-registered pharmacists, our responsibility is to provide evidence-based guidance that prioritises patient safety. Whilst we acknowledge that medication costs represent a genuine concern for many patients, and that residual medication in pens can feel wasteful, we cannot recommend techniques that circumvent the manufacturer's intended usage or regulatory guidance.

The question of extracting a fifth dose fundamentally relates to medication value and accessibility. These are valid concerns that deserve proper solutions — but those solutions should come through transparent pricing, clinical discussions about appropriate dosing, and exploring alternative treatments when necessary, not through modifying pen mechanisms in ways that compromise safety or efficacy.

If you're finding your current Mounjaro regimen unsustainable, our superintendent pharmacist Tarun Kumar and the clinical team at Cured Pharmacy can review your options during a confidential consultation. This might include discussing alternative GLP-1 treatments, adjusting your maintenance dose, or exploring combination approaches to weight management that balance clinical effectiveness with practical affordability.

Proper Pen Disposal and Medication Storage

After completing your four prescribed doses, dispose of your Mounjaro pen according to UK guidelines for sharps waste. Most local pharmacies, including Cured Pharmacy, accept used pen devices in appropriate sharps containers. Never dispose of injection pens in household waste where they could pose injury risk to others.

Store unused Mounjaro pens in the refrigerator at 2-8°C until first use. Once you've administered the first injection, you may keep the pen at room temperature (not exceeding 30°C) for up to 21 days. Always replace the pen cap after each use to protect the medication from light, and never store pens with needles attached, as this can introduce air bubbles and affect dose accuracy.

Comparing Weight Loss Treatment Options at Cured Pharmacy

If Mounjaro's cost is influencing your consideration of extracting additional doses, it's worth understanding the full range of MHRA-licensed weight management treatments available through UK prescribers. Each option has distinct mechanisms, dosing schedules, and cost profiles that may better suit your individual circumstances.

Wegovy (semaglutide) is a once-weekly GLP-1 receptor agonist that demonstrated average weight loss of 14.9% over 68 weeks in the STEP-1 trial [4]. Whilst tirzepatide showed superior results in head-to-head studies, semaglutide remains highly effective for many patients and may be prescribed at a different price point depending on your clinical assessment.

Saxenda (liraglutide) requires daily injections but offers a different titration approach that some patients prefer. Oral medications like Orlistat work through fat absorption inhibition rather than appetite regulation, representing a non-injectable alternative for patients who prefer tablet-based treatment. Your UK prescriber will assess which option aligns with your medical history, weight management goals, and practical preferences during your consultation.

Scientific References

  1. Jastreboff, A. M., 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]
  2. European Medicines Agency. (2022). Mounjaro EPAR – Product Information. EMA/CHMP Assessment Report. Retrieved from https://www.ema.europa.eu/en/medicines/human/EPAR/mounjaro [accessed 13 August 2026]
  3. Ludvik, B., et al. (2021). Once-weekly tirzepatide versus once-daily insulin degludec as add-on to metformin with or without SGLT2 inhibitors in patients with type 2 diabetes (SURPASS-3): a randomised, open-label, parallel-group, phase 3 trial. The Lancet, 398(10300), 583–598. https://doi.org/10.1016/S0140-6736(21)01443-4 [accessed 13 August 2026]
  4. Wilding, J. P. H., 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 pens are designed and licensed for four doses as specified by the manufacturer and MHRA guidance. Any modification to prescribed usage should only occur under direct supervision of your prescriber.

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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

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Faq

Can you legally extract a 5th dose from a Mounjaro pen in the UK?
Mounjaro pens are licensed for four doses as specified in the MHRA-approved patient information leaflet. Any usage beyond the manufacturer's instructions should only occur under direct guidance from your UK prescriber, who can assess the appropriateness for your individual circumstances.
How much medication is left in a Mounjaro pen after four doses?
The amount of residual medication varies by dose strength due to manufacturing overfill designed to ensure accurate dosing. However, this overfill is not validated for safe extraction and any remaining volume is of unknown concentration and sterility after the fourth dose.
Will extracting a 5th dose from my Mounjaro pen affect my weight loss results?
Inconsistent dosing may compromise the steady therapeutic levels that tirzepatide requires for optimal efficacy. The clinical trials demonstrating Mounjaro's effectiveness used precise, consistent weekly dosing, and deviating from this pattern could affect your treatment response.
Is it safe to use a Mounjaro pen beyond the four prescribed doses?
Using the pen beyond its designed capacity introduces risks including dose inaccuracy, compromised sterility, and potential medication degradation. We recommend discussing any supply or cost concerns with your prescriber rather than independently modifying your treatment regimen.
What should I do if I can't afford my prescribed Mounjaro dose?
Contact your prescriber to discuss alternatives, including adjusting your maintenance dose, exploring other GLP-1 treatments, or accessing competitive pricing. At Cured Pharmacy, Mounjaro starts from £124.99 with transparent upfront pricing and no hidden fees.
How do I know when my Mounjaro pen is completely empty?
The pen's dose selector locks after four injections, indicating you've received the prescribed doses. Whilst residual medication may remain due to manufacturing overfill, the pen's calibration system no longer functions accurately beyond this point.
Can I switch to a different weight loss injection if Mounjaro is too expensive?
Yes, several MHRA-licensed alternatives exist, including Wegovy and Saxenda, each with different pricing and dosing schedules. Your UK prescriber can assess which option best suits your clinical needs and budget during a confidential consultation at Cured Pharmacy.
Where can I get the best price for Mounjaro in the UK?
Cured Pharmacy offers Mounjaro from £124.99 with our lowest price guarantee, free UK prescriber consultation, and discreet home delivery. All pricing is transparent upfront, and we dispense only genuine MHRA-licensed medication through our GPhC-registered pharmacy.
How do you get a 5th dose out of a Mounjaro pen in the UK?
Each Mounjaro pen is designed to deliver four doses only as approved by the manufacturer and UK regulatory standards. Attempting to extract a 5th dose is not recommended, as the pen lacks sufficient medication and may compromise dosing accuracy. Cured Pharmacy supplies authentic Mounjaro pens with the correct four-dose capacity for safe, effective treatment.
Is it safe to try getting extra doses from a Mounjaro pen?
No, trying to get a 5th dose out of a Mounjaro pen is unsafe and could result in underdosing or pen malfunction. Each pen is precisely calibrated for four doses, and attempting to exceed this may lead to inaccurate medication delivery. Cured Pharmacy recommends following the prescribed dosing schedule and ordering a new pen when needed.
Why do some people want to get a 5th dose from their Mounjaro pen?
Some patients attempt this to save money, but it compromises treatment safety and effectiveness. Mounjaro pens contain exactly four doses, and trying to extract more can lead to inconsistent dosing. Cured Pharmacy offers Mounjaro from £124.99 with £20 off your first order using code Weightlossnew, making genuine treatment more affordable.
Can underdosing Mounjaro by stretching doses affect weight loss results?
Yes, underdosing or irregular dosing can significantly impact your weight loss results and increase side effects when resuming proper doses. Mounjaro works best when taken consistently as prescribed every seven days. Cured Pharmacy provides affordable pricing and subscription options to help you maintain your correct dosing schedule without interruption.
Where can I buy genuine Mounjaro pens at the cheapest UK price?
Cured Pharmacy offers Mounjaro from £124.99, the cheapest UK price with authentic four-dose pens sourced directly from licensed suppliers. You'll save £20 off your first order with code Weightlossnew, and all orders include a free UK-registered prescriber consultation. We deliver genuine medication with next-day delivery across the UK.
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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