Mounjaro and Underactive Thyroid UK Guide From £124.99

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Mounjaro and Underactive Thyroid - From £124.99

Mounjaro from £124.99 with £20 off first order using code Weightlossnew.

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Height 175 cm
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LIVE PRICING

Our Pricing

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

£109 £89.00

£22.25 / Per Week

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

⭐ Future Orders at £109
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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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Mounjaro and Underactive Thyroid: UK Clinical Guidance

Published: 10 September 2026

Understanding the relationship between mounjaro and underactive thyroid is essential for patients with hypothyroidism considering tirzepatide for weight loss. Many people with underactive thyroid conditions struggle with weight management despite medication, and Mounjaro offers a clinically proven option—though specific considerations apply when combining it with thyroid hormone replacement therapy.

Can You Use Mounjaro With Underactive Thyroid?

Mounjaro and underactive thyroid conditions can generally be managed together safely, subject to prescriber approval. Hypothyroidism itself is not listed as a contraindication to tirzepatide treatment in MHRA guidance [1]. However, patients with underactive thyroid must have their condition adequately controlled on levothyroxine or other thyroid replacement therapy before starting Mounjaro.

Clinical assessment by a UK prescriber will evaluate your thyroid function tests (TSH, T4 levels), current thyroid medication dose, and overall metabolic stability. Weight loss from Mounjaro may alter your thyroid hormone requirements over time, so ongoing monitoring with your GP or endocrinologist remains essential throughout treatment [2].

Mounjaro and Underactive Thyroid: Drug Interactions

There are no direct pharmacological interactions between mounjaro and underactive thyroid medications like levothyroxine. Tirzepatide does not interfere with thyroid hormone absorption or metabolism at a molecular level [3]. However, because Mounjaro slows gastric emptying, timing of thyroid medication may require adjustment.

Levothyroxine is typically taken on an empty stomach first thing in the morning, 30-60 minutes before food. This timing should be maintained while using Mounjaro. Some patients report altered absorption patterns during initial weeks of tirzepatide treatment due to gastrointestinal effects, so thyroid function should be rechecked 6-8 weeks after starting Mounjaro to ensure TSH levels remain stable [4].

Monitoring Thyroid Levels During Mounjaro Treatment

As you lose weight on Mounjaro, your thyroid hormone requirements may decrease. In clinical practice, some patients with underactive thyroid require levothyroxine dose reductions as their body weight normalises and metabolic demand changes. Regular blood tests—ideally every 8-12 weeks initially—help ensure thyroid hormone levels remain optimal throughout your weight loss journey.

Weight Loss Effectiveness: Mounjaro and Underactive Thyroid

Clinical trials of tirzepatide did not exclude participants with well-controlled hypothyroidism, and real-world evidence suggests mounjaro and underactive thyroid patients achieve comparable weight loss outcomes to those without thyroid conditions [5]. In the SURMOUNT-1 trial, participants taking 15mg tirzepatide lost an average of 20.9% body weight over 72 weeks.

Patients with underactive thyroid may experience slightly slower initial weight loss if their condition is suboptimally treated, as hypothyroidism itself can reduce metabolic rate. Ensuring your TSH is within the optimal range (typically 0.5-2.5 mIU/L for weight management) before starting Mounjaro maximises treatment effectiveness. At Cured Pharmacy, our prescribers assess thyroid control as part of the clinical consultation, with Mounjaro available from £124.99 following approval.

Optimising Results With Hypothyroidism

To achieve best results when combining mounjaro and underactive thyroid treatment, maintain consistent levothyroxine dosing, attend regular thyroid monitoring appointments, and report any symptoms of over- or under-replacement (palpitations, fatigue, temperature sensitivity) to your healthcare provider promptly. Nutritional adequacy—particularly iodine and selenium intake—also supports thyroid health during weight loss.

Treatment Type Frequency Starting Price
Mounjaro (Tirzepatide) GLP-1/GIP injection Weekly From £145.00
Wegovy (Semaglutide) GLP-1 injection Weekly From £89.00
Saxenda (Liraglutide) GLP-1 injection Daily From £68.00
Orlistat Fat absorption inhibitor Three times daily From £32.00

Safety Considerations: Mounjaro and Underactive Thyroid Conditions

The primary safety concern with mounjaro and underactive thyroid relates to a different thyroid condition: medullary thyroid carcinoma (MTC). Tirzepatide carries a boxed warning regarding thyroid C-cell tumours observed in rodent studies, though no causal link has been established in humans [6]. Patients with personal or family history of MTC or Multiple Endocrine Neoplasia syndrome type 2 (MEN2) should not use Mounjaro.

Standard hypothyroidism (autoimmune or post-ablative) does not increase MTC risk and is not a contraindication to tirzepatide. However, if you have a history of thyroid nodules or abnormal thyroid ultrasound findings, your prescriber may request recent imaging or specialist clearance before approving Mounjaro treatment.

Starting Mounjaro With Underactive Thyroid: Clinical Process

When assessing suitability for mounjaro and underactive thyroid patients, UK prescribers require recent thyroid function test results (ideally within 3-6 months), confirmation of your current levothyroxine dose, and evidence of stable thyroid control. The online consultation at Cured Pharmacy includes specific questions about thyroid history and current medication.

If approved, you'll start on Mounjaro 2.5mg weekly, with dose escalation every 4 weeks as tolerated. Your thyroid medication continues unchanged initially, but you should arrange thyroid monitoring with your GP at 6-8 weeks, then every 12 weeks. Report any symptoms suggesting thyroid imbalance—unexplained fatigue, heart palpitations, or temperature intolerance—to your healthcare provider promptly [7].

Prescription Requirements and Approvals

All Mounjaro prescriptions require clinical assessment by a UK-registered prescriber. The consultation evaluates your BMI, weight loss history, comorbidities including thyroid conditions, and current medications. Treatment is subject to prescriber approval based on individual clinical suitability and absence of contraindications.

Mounjaro and Underactive Thyroid: UK Pricing and Access

At Cured Pharmacy, mounjaro and underactive thyroid patients can access tirzepatide from £124.99 following online clinical assessment. New patients receive £20 off their first order using code Weightlossnew. Pricing includes the medication, UK prescriber consultation, and discreet home delivery.

Treatment typically continues for 6-12 months or longer depending on weight loss goals and clinical response. Regular thyroid monitoring (blood tests) should be arranged through your NHS GP at no additional cost. Our superintendent pharmacist Tarun Kumar (GPhC 2233073) and clinical team provide ongoing support throughout your treatment journey, ensuring safe coordination with your thyroid medication [8].

Scientific References

  1. Medicines and Healthcare products Regulatory Agency. (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen: Summary of Product Characteristics. MHRA. [accessed 10 September 2026]
  2. Pearce, S. H., Brabant, G., Duntas, L. H., Monzani, F., Peeters, R. P., Razvi, S., & Wemeau, J. L. (2013). 2013 ETA Guideline: Management of subclinical hypothyroidism. European Thyroid Journal, 2(4), 215-228. [accessed 10 September 2026]
  3. Nauck, M. A., & D'Alessio, D. A. (2022). Tirzepatide, a dual GIP/GLP-1 receptor co-agonist for the treatment of type 2 diabetes with unmatched effectiveness regrading glycaemic control and body weight reduction. Cardiovascular Diabetology, 21(1), 169. [accessed 10 September 2026]
  4. Centanni, M., Gargano, L., Canettieri, G., Viceconti, N., Franchi, A., Delle Fave, G., & Annibale, B. (2006). Thyroxine in goiter, Helicobacter pylori infection, and chronic gastritis. New England Journal of Medicine, 354(17), 1787-1795. [accessed 10 September 2026]
  5. Jastreboff, A. M., Aronne, L. J., Ahmad, N. N., Wharton, S., Connery, L., Alves, B., ... & Bunck, M. C. (2022). Tirzepatide once weekly for the treatment of obesity. New England Journal of Medicine, 387(3), 205-216. [accessed 10 September 2026]
  6. Gier, B., Matveyenko, A. V., Kirakossian, D., Dawson, D., Dry, S. M., & Butler, P. C. (2012). Chronic GLP-1 receptor activation by exendin-4 induces expansion of pancreatic duct glands in rats and accelerates formation of dysplastic lesions and chronic pancreatitis in the Kras G12D mouse model. Diabetes, 61(5), 1250-1262. [accessed 10 September 2026]
  7. National Institute for Health and Care Excellence. (2023). Tirzepatide for treating type 2 diabetes [TA924]. NICE. [accessed 10 September 2026]
  8. General Pharmaceutical Council. (2023). Standards for registered pharmacies. GPhC. [accessed 10 September 2026]
  9. NHS. (2026). Tirzepatide: a medicine to manage type 2 diabetes and treat obesity. https://www.nhs.uk/medicines/tirzepatide/ Accessed 10 September 2026.
  10. NHS. (2026). Overweight and obesity in adults. https://www.nhs.uk/conditions/overweight-and-obesity/ Accessed 10 September 2026.
  11. NHS England. (2026). Weight management injections. https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/ Accessed 10 September 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.

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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!"

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Faq

Is Mounjaro safe if I have an underactive thyroid?
Yes, mounjaro and underactive thyroid conditions can be safely managed together in most cases, provided your hypothyroidism is well-controlled on levothyroxine and you have no personal or family history of medullary thyroid carcinoma. Clinical assessment by a UK prescriber confirms individual suitability.
Will Mounjaro affect my levothyroxine absorption?
Mounjaro does not directly interact with levothyroxine, but its effect on gastric emptying may alter absorption timing. Continue taking levothyroxine on an empty stomach in the morning, and arrange thyroid function monitoring 6-8 weeks after starting tirzepatide to ensure levels remain stable.
Can I lose weight with Mounjaro if I have hypothyroidism?
Clinical evidence shows mounjaro and underactive thyroid patients achieve comparable weight loss to those without thyroid conditions when hypothyroidism is adequately treated. Ensuring your TSH is optimally controlled (typically 0.5-2.5 mIU/L) before starting Mounjaro maximises effectiveness.
Do I need thyroid blood tests before starting Mounjaro?
Yes, prescribers typically require recent thyroid function results (TSH, T4) within the past 3-6 months to confirm your underactive thyroid is stable before approving Mounjaro. Ongoing monitoring every 8-12 weeks is recommended during weight loss treatment.
Will losing weight on Mounjaro change my thyroid medication dose?
Possibly—as body weight decreases, thyroid hormone requirements may reduce. Regular monitoring allows your GP to adjust levothyroxine dosing if needed, ensuring thyroid levels remain optimal throughout your mounjaro and underactive thyroid treatment journey.
What thyroid conditions prevent Mounjaro use?
Personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN2) are contraindications to Mounjaro. Standard autoimmune hypothyroidism (Hashimoto's) or post-surgical/radioiodine hypothyroidism do not prevent tirzepatide use.
How much does Mounjaro cost for underactive thyroid patients in the UK?
Pricing is the same regardless of thyroid status—Mounjaro is available from £124.99 at Cured Pharmacy following online clinical assessment. New patients receive £20 off with code Weightlossnew, and treatment includes UK prescriber consultation and discreet delivery.
Can Mounjaro cause thyroid problems?
Mounjaro does not cause hypothyroidism or hyperthyroidism. Rodent studies showed thyroid C-cell tumours, but no causal link exists in humans. Patients with existing well-controlled underactive thyroid can safely use tirzepatide with appropriate monitoring, subject to prescriber approval.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 10 September 2026

Last updated on 10 September 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 10 September 2026

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

Current version (10 September 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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