Mounjaro Doses & Side Effects UK | Safety Guide

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Cheapest Mounjaro Doses - UK Price From £124.99

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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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Understanding Mounjaro Doses: Side Effects & Safety Profile

Published on: June 03, 2026

Understanding mounjaro doses and side effects uk is essential before starting tirzepatide treatment. At Cured Pharmacy, our UK-registered clinical team provides comprehensive guidance on Mounjaro's titration schedule, common side effects, and safety monitoring throughout your weight management journey.

Mounjaro Dosing Schedule: How Titration Works

Mounjaro follows a structured dose escalation protocol designed to minimise gastrointestinal side effects whilst optimising therapeutic response. The treatment begins at 2.5mg once weekly for four weeks, serving as an initial dose that allows your body to adjust to tirzepatide's dual GIP/GLP-1 receptor activity [1].

After the first month, your UK prescriber will typically increase your dose to 5mg weekly, maintaining this for at least four weeks before considering further escalation. The SURPASS clinical trial programme demonstrated that this gradual titration approach significantly reduces the incidence of nausea and vomiting compared to rapid dose increases [1][2].

The maximum licensed dose is 15mg once weekly, though many patients achieve their weight management goals at lower maintenance doses. Your prescriber will determine the optimal dose based on your individual response, tolerability, and clinical objectives. Available at Cured Pharmacy from £135.00 each Mounjaro KwikPen contains four weekly doses at your prescribed strength.

Dose Escalation Timeline

The standard titration schedule progresses through 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and finally 15mg, with a minimum four-week interval between increases. This methodical approach allows gastrointestinal adaptation and helps identify your optimal therapeutic dose. Your UK prescriber may pause escalation at any stage if you experience significant side effects or achieve satisfactory weight reduction [2].

Common Mounjaro Side Effects: What to Expect

The most frequently reported side effects of Mounjaro are gastrointestinal in nature, affecting approximately 30-40% of patients during dose escalation phases. Nausea, diarrhoea, decreased appetite, vomiting, and constipation typically emerge within the first few days after dose increases and usually resolve within one to two weeks as your body adjusts [1][3].

In the SURPASS-1 trial, nausea occurred in 12-18% of participants on the 5mg dose, increasing to 17-22% at the 15mg maintenance dose. Importantly, severe gastrointestinal events leading to treatment discontinuation occurred in fewer than 5% of patients, indicating that most side effects are manageable with appropriate clinical guidance [1].

Less common but notable side effects include injection site reactions (redness, itching, or mild swelling), fatigue during the first few weeks, and occasional dizziness. These effects are generally mild to moderate in severity and diminish as treatment continues. Our clinical team at Cured Pharmacy provides ongoing support to help you manage any side effects effectively.

Managing Gastrointestinal Side Effects

Practical strategies can significantly reduce the impact of gastrointestinal side effects during Mounjaro treatment. Eating smaller, more frequent meals rather than three large meals helps prevent overwhelming your digestive system. Avoiding high-fat, greasy, or heavily spiced foods during the first few days after each dose increase reduces nausea risk [3].

Staying well-hydrated is crucial, particularly if you experience vomiting or diarrhoea. Aim for at least two litres of water daily, and consider electrolyte solutions if gastrointestinal symptoms persist beyond 48 hours. Eating slowly and stopping when comfortably satisfied—rather than completely full—works with tirzepatide's appetite-suppressing effects rather than against them.

If nausea becomes problematic, ginger tea, plain crackers, or cold foods may provide relief. Your UK prescriber can also recommend over-the-counter anti-nausea medications suitable for use alongside Mounjaro. Should side effects become severe or persistent beyond two weeks at a stable dose, contact your prescriber to discuss potential dose adjustments.

When to Contact Your Prescriber

Seek immediate medical attention if you experience severe abdominal pain that doesn't resolve, persistent vomiting preventing fluid intake, signs of pancreatitis (severe upper abdominal pain radiating to your back), or symptoms of gallbladder problems. These serious adverse events are rare but require prompt clinical assessment [3][4].

Treatment Starting Dose Maximum Dose Common Side Effects Starting Price
Mounjaro (tirzepatide) 2.5mg weekly 15mg weekly Nausea (17-22%), diarrhoea, decreased appetite From £124.99
Wegovy (semaglutide) 0.25mg weekly 2.4mg weekly Nausea (25-30%), diarrhoea, constipation From £69.00
Saxenda (liraglutide) 0.6mg daily 3mg daily Nausea (40%), diarrhoea, constipation From £68.00
Orlistat 120mg three times daily 120mg three times daily Oily stools, faecal urgency, flatulence From £32.00

Mounjaro Safety Profile and Contraindications

Mounjaro carries a comprehensive safety profile established through extensive clinical trials involving over 5,000 participants across the SURPASS programme. The MHRA licensed tirzepatide for weight management in adults with a BMI of 30 kg/m² or greater, or 27 kg/m² with weight-related comorbidities, following rigorous safety evaluation [1][2].

Absolute contraindications include personal or family history of medullary thyroid carcinoma, Multiple Endocrine Neoplasia syndrome type 2, and hypersensitivity to tirzepatide or any excipients. Mounjaro is not recommended during pregnancy or breastfeeding, and women of childbearing potential should use effective contraception during treatment and for four weeks after discontinuation [4].

Patients with a history of pancreatitis, severe gastrointestinal disease, or diabetic retinopathy require careful assessment before starting Mounjaro. Your UK prescriber will review your complete medical history during the online consultation to ensure tirzepatide is appropriate and safe for your individual circumstances. All prescription medications at Cured Pharmacy require clinical assessment by a UK-registered prescriber before dispensing.

Mounjaro vs Wegovy: Safety and Side Effect Comparison

Both Mounjaro (tirzepatide) and Wegovy (semaglutide) belong to the GLP-1 receptor agonist class, but tirzepatide's dual GIP/GLP-1 mechanism produces distinct clinical effects. Head-to-head comparison data from the SURPASS-2 trial showed that tirzepatide achieved greater weight reduction than semaglutide, with average losses of 22.5% versus 15.8% at maximum doses over 72 weeks [2][5].

Regarding side effects, both medications share similar gastrointestinal tolerability profiles, with nausea, diarrhoea, and decreased appetite being most common. However, the incidence of nausea was slightly lower with tirzepatide (17-22%) compared to semaglutide 2.4mg (approximately 25-30% in STEP trials), potentially due to tirzepatide's dual receptor activity providing smoother metabolic regulation [5].

Treatment discontinuation rates due to adverse events were comparable between both medications, ranging from 4-7% across major clinical trials. The choice between Mounjaro and Wegovy depends on individual response, medical history, and clinical goals rather than safety differences. Wegovy is available at Cured Pharmacy alongside Mounjaro, with both requiring UK prescriber assessment.

Choosing Between Treatments

Your UK prescriber will consider factors including previous GLP-1 experience, weight management goals, cardiovascular risk factors, and cost considerations when recommending between tirzepatide and semaglutide. Both represent evidence-based options for weight management when used alongside lifestyle modifications including reduced-calorie diet and increased physical activity [2][5].

Long-Term Safety Monitoring on Mounjaro

Ongoing clinical monitoring ensures safe, effective Mounjaro treatment throughout your weight management journey. Your UK prescriber will typically schedule follow-up consultations at 4, 12, and 24 weeks after initiation, then every 12 weeks during maintenance therapy. These reviews assess weight reduction progress, side effect management, and any need for dose adjustments [4].

Baseline and periodic monitoring may include assessment of thyroid function, pancreatic enzymes if you experience persistent abdominal symptoms, and cardiovascular risk factors. Patients with pre-existing type 2 diabetes require blood glucose monitoring, particularly during dose escalation phases when hypoglycaemia risk increases if combined with insulin or sulfonylureas [3][4].

The SURPASS trials demonstrated sustained weight reduction and metabolic improvements over 72 weeks, with ongoing extension studies evaluating safety beyond two years. Real-world safety data collected by the MHRA continues to support tirzepatide's favourable benefit-risk profile when prescribed appropriately. At Cured Pharmacy, our superintendent pharmacist Tarun Kumar (GPhC 2233073) and clinical team provide continuous support throughout your treatment, with accessible advice available via phone on 116 4646009.

Reporting Side Effects

If you experience any side effects whilst taking Mounjaro, report them to your UK prescriber and directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This pharmacovigilance system helps monitor the ongoing safety of all licensed medications in the UK, contributing to patient safety improvements across the healthcare system [4].

Scientific References

  1. 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]
  2. Frías, J. P., Davies, M. J., Rosenstock, J., et al. (2021). Tirzepatide versus Semaglutide Once Weekly in Patients with Type 2 Diabetes (SURPASS-2). New England Journal of Medicine, 385(6), 503–515. https://doi.org/10.1056/NEJMoa2107519 [accessed 13 August 2026]
  3. Medicines and Healthcare products Regulatory Agency (MHRA). (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen: Summary of Product Characteristics. Retrieved from https://products.mhra.gov.uk/ [accessed 13 August 2026]
  4. Electronic Medicines Compendium (EMC). (2024). Mounjaro KwikPen – Patient Information Leaflet. Eli Lilly and Company Limited. Retrieved from https://www.medicines.org.uk/emc/ [accessed 13 August 2026]
  5. Wilding, J. P. H., Batterham, R. L., Calanna, S., et al. (2021). Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1 trial). New England Journal of Medicine, 384(11), 989–1002. https://doi.org/10.1056/NEJMoa2032183 [accessed 13 August 2026]
  6. NHS. (2026). Tirzepatide: a medicine to manage type 2 diabetes and treat obesity. https://www.nhs.uk/medicines/tirzepatide/ Accessed 13 August 2026.
  7. NHS. (2026). Overweight and obesity in adults. https://www.nhs.uk/conditions/overweight-and-obesity/ Accessed 13 August 2026.
  8. 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 is a prescription-only medicine and must be prescribed following an online consultation with a UK-registered clinician. Individual results may vary, and weight loss outcomes depend on adherence to treatment alongside lifestyle modifications including diet and exercise.

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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

What is the starting dose of Mounjaro?
The starting dose of Mounjaro is 2.5mg injected once weekly for four weeks. This initial dose allows your body to adjust to tirzepatide before your UK prescriber increases it to 5mg and potentially higher maintenance doses based on your response and tolerability.
How long do Mounjaro side effects last?
Most Mounjaro side effects, particularly nausea and gastrointestinal symptoms, peak within 2-3 days after each dose increase and typically resolve within 1-2 weeks as your body adjusts. Side effects generally become less frequent and less severe as you continue treatment at a stable maintenance dose.
Can I skip a dose if I have side effects?
If you miss a Mounjaro dose, take it as soon as possible within four days. If more than four days have passed, skip the missed dose and resume your regular weekly schedule. Never double doses to compensate, and contact your UK prescriber if side effects are making you consider skipping doses regularly.
Is Mounjaro safer than Wegovy?
Both Mounjaro and Wegovy have similar safety profiles, with comparable rates of gastrointestinal side effects and treatment discontinuation. Clinical trials show slightly lower nausea incidence with tirzepatide (17-22%) compared to semaglutide 2.4mg (25-30%), though individual responses vary.
What are the serious side effects of Mounjaro?
Serious but rare side effects include pancreatitis (severe abdominal pain), gallbladder problems, kidney injury from dehydration, severe allergic reactions, and diabetic retinopathy complications. Seek immediate medical attention if you experience severe persistent abdominal pain, vision changes, or signs of severe dehydration.
Do mounjaro doses and side effects uk vary by age?
Mounjaro dosing follows the same titration schedule regardless of age for adults, though older patients may require closer monitoring for dehydration and kidney function. The medication is not licensed for use in individuals under 18 years. Side effect profiles remain consistent across adult age groups in clinical trials.
How do I inject Mounjaro to minimise side effects?
Inject Mounjaro subcutaneously in your abdomen, thigh, or upper arm, rotating injection sites weekly to prevent lipodystrophy. Injecting at the same time each week and on the same day helps maintain consistent medication levels, potentially reducing side effect fluctuations. Allow the pen to reach room temperature before injecting for improved comfort.
Can I drink alcohol while taking Mounjaro?
Moderate alcohol consumption is generally acceptable on Mounjaro, though alcohol may worsen nausea and increase dehydration risk. Excessive alcohol intake can also hinder weight loss efforts and increase the risk of pancreatitis. Discuss your alcohol consumption with your UK prescriber during your clinical assessment.
How do Mounjaro doses increase and what are the side effects at each level?
Mounjaro doses start at 2.5mg and increase every 4 weeks through 5mg, 7.5mg, 10mg, 12.5mg, to a maximum of 15mg. Side effects like nausea and diarrhoea are typically most common when increasing doses, but often reduce as your body adjusts. Cured Pharmacy provides full dosing guidance with every prescription to help you manage side effects effectively.
Where can I find the cheapest Mounjaro doses in the UK?
Cured Pharmacy offers the cheapest Mounjaro doses in the UK, starting from £124.99 for the 2.5mg dose with £20 off your first order using code Weightlossnew. Our prices are transparent across all doses, with no hidden fees, and include UK-registered prescriber review and next-day delivery options.
What are the most common side effects of Mounjaro in UK patients?
The most common Mounjaro side effects reported by UK patients include nausea, diarrhoea, reduced appetite, vomiting, and constipation, especially during the first few weeks. These side effects typically reduce over time as your body adjusts to the medication. Cured Pharmacy's clinical team provides ongoing support to help you manage any side effects throughout your treatment.
Can I skip a Mounjaro dose if I experience side effects?
If you miss a Mounjaro dose, take it within 4 days of the missed dose, then continue your regular schedule. If more than 4 days have passed, skip the missed dose and take your next dose on the regularly scheduled day. Cured Pharmacy's prescribers can advise on managing side effects without skipping doses to maintain treatment effectiveness.
Does the price of Mounjaro change as my dose increases?
Yes, Mounjaro prices increase with higher doses, ranging from £124.99 for 2.5mg to £267.00 for 15mg at Cured Pharmacy. You can save £20 on your first order of any dose using code Weightlossnew. Our transparent pricing means you'll always know the cost before your dose is increased during your treatment journey.
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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