Mounjaro (Tirzepatide) Injections

Clinical trials show Mounjaro delivers impressive results when combined with lifestyle changes:

• Up to 15.7% body weight loss in people with type 2 diabetes (Eli Lilly, 2023)
• Up to 20% weight loss over 18 months in broader studies (Singh, 2024)
• Up to 22.5% weight loss in non-diabetic individuals in the SURMOUNT-1 trial (Jastreboff et al., 2022)

Latest Evidence: Wegovy vs Mounjaro

Find out which weight loss injection performed better in the May 2025 head-to-head trial: Mounjaro or Wegovy?

Lose More Weight with Mounjaro

Studies show Mounjaro is up to 6× more effective than lifestyle changes alone and nearly doubles weight loss compared to other medications. High-dose tirzepatide with lifestyle changes led to:

• 20.9% weight loss in 36 weeks
• 25.3% weight loss in 88 weeks (Aronne et al, 2023)

What if You’re Not Losing Weight On The Medication?

Not seeing results? It may be due to inconsistent use, dietary habits, or underlying health conditions. Read our guide: Why Am I Not Losing Weight on Mounjaro?. Always consult your prescriber for advice.

IN STOCK NOW: Available in 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg doses

How to Order Mounjaro Online in the UK

To buy Mounjaro online in the UK, simply complete a quick online consultation. A registered prescriber will assess your BMI, health history, and current medications to check if tirzepatide treatment is suitable for you.

How it Works

1. Step 1: Fill out a health questionnaire online
2. Step 2: If approved, a free private prescription will be issued to allow you to place your order securely

Your medication will be sent with next-day delivery in temperature-controlled cold-chain packaging that keeps your medicine at the right temperature..

For more information before starting the GLP-1/GIP dual-agonist treatment, read our full UK guide to buying Mounjaro.

Do You Need a Prescription for Mounjaro?

Yes, Mounjaro is a prescription-only medicine in the UK. Whether you're using it for weight loss or type 2 diabetes, a consultation is required. Learn more: Do You Need a Prescription for Mounjaro?

Can I Get a Private Mounjaro Prescription?

If you don’t qualify for treatment on the NHS, you can still access private prescriptions for this treatment through UK Meds. After clinical review, you’ll receive a free prescription and can order the medication online for home delivery.

Is It Legal to Purchase It Online in the UK?

Yes. Mounjaro can be prescribed privately in the UK, even though NHS access is limited to specific high-risk patients through specialist weight management clinics. Private services like UK Meds offer faster, medically supervised access for eligible individuals.

Why Choose UK Meds?

• Free online consultation - no GP appointment needed
• Next-day delivery with refrigerated packaging
• Genuine treatments from UK-registered pharmacies
• Discreet, secure, and trusted online service

If you're looking to start a weight loss programme with support from injection pen treatments or you want to manage diabetes with tirzepatide, UK Meds provides a legal, safe, and convenient way to begin your treatment journey.

Choose the Best Delivery Options

Decide on the best discreet delivery option for your order below.

Please note: Delivery options and pricing are subject to change. For the latest information on UK Meds delivery options please visit our delivery page to learn more. You can also read our other policies including our returns process.

Looking to buy Mounjaro in the UK? Below is a guide to current prices for the Mounjaro KwikPen across all available strengths. Each pen contains four weekly doses and is priced based on the dosage prescribed as part of your treatment plan.

How Much Does Mounjaro Cost?

The cost per pen starts from £134.99* / month. If titrating all the way up to the maximum dose and maintaining, the annual cost is £1,934.60.

One pen contains four doses, so a pen lasts for 4 weeks.

Please note: Pricing is subject to change. For the latest information please refer to the consultation section at the top of the product information page.

For more information on this prescription medication patients should refer to the Mounjaro patient information leaflet.

People using Mounjaro (tirzepatide) in the UK have reported a range of experiences, as responses to weight loss treatments can vary from person to person. What works well for one individual may differ for another based on factors like lifestyle, medical history, and how their body reacts to treatment.

Real Mounjaro Reviews

Curious about how others are getting on? Read our full collection of UK customer reviews and testimonials to see how Mounjaro has helped people on their weight loss journeys.

For broader insights, you can also browse international reviews on trusted platforms such as Drugs.com and WebMD.

Why Results May Vary

Everyone’s weight loss journey is unique. If you're considering Mounjaro, it's best to speak to your GP or a healthcare professional. If prescribed, you can monitor your own results and adjust treatment under medical supervision.

For further inspiration, explore real-life Mounjaro success stories from patients across the UK.

What is Mounjaro?

Mounjaro (tirzepatide), pronounced “mown-JAHR-oh”, is a once-weekly injectable medicine used to treat type 2 diabetes and support weight loss. It works by regulating blood sugar, reducing appetite, and curbing cravings—especially when combined with a calorie-controlled diet and regular exercise.

Who Can Use Mounjaro?

Mounjaro is typically prescribed to adults who meet one of the following criteria:

• Have a BMI of 30 or higher (classified as obese)
• Have a BMI of 27 or higher and a related health condition such as:
  • Prediabetes
  • High blood pressure
  • High cholesterol
  • Heart disease

Consult a healthcare professional to determine if Mounjaro is suitable for you.

For more information, visit our Beginner's Guide to Mounjaro.

How Does Mounjaro Work?

Mounjaro contains tirzepatide, a dual-action GLP-1 and GIP receptor agonist. These two naturally occurring gut hormones help regulate blood sugar and appetite:

• GLP-1 (Glucagon-Like Peptide-1): Reduces hunger and supports blood sugar control.
• GIP (Glucose-Dependent Insulinotropic Polypeptide): Enhances insulin response and appetite regulation.

How Mounjaro Supports Weight Loss

• Regulates blood sugar to reduce cravings and maintain stable energy
• Suppresses appetite by mimicking fullness hormones
• Slows digestion to keep you feeling full longer
• Improves energy balance by working with the brain and fat cells

Its dual-action mechanism makes Mounjaro more effective for weight loss than GLP-1–only treatments like Wegovy and Ozempic (Nauck & D'Alessio, 2022).

How Long Does Mounjaro Take to Work?

Mounjaro starts working right away, but noticeable improvements in appetite and blood sugar may take a few weeks. For best results, follow your doctor’s guidance and maintain a healthy lifestyle.

How to Use the Mounjaro Pen

Mounjaro (tirzepatide) is a once-weekly injection used to support weight loss and manage type 2 diabetes. It comes in an easy-to-use prefilled KwikPen. Here's how to take it safely and effectively.

Where and How to Inject

• Stomach (abdomen): Inject at least 5cm away from your belly button.
• Front of thighs: Suitable for self-injection.
• Upper arms: Best administered by someone else.

Rotate injection sites weekly to help avoid irritation and improve absorption. Don’t inject into bruised, scarred, or irritated areas.

Step-by-Step: How to Use the KwikPen

1. Set the dose: Turn the dial to match your prescribed amount.
2. Inject under the skin: Choose the stomach, thigh or upper arm.
3. Rotate sites: Use a different spot each week to minimise discomfort.

Watch a real demonstration to see how to use the Mounjaro KwikPen properly.

You can also follow UK Meds' full instructions here.

When to Take Mounjaro

• Inject once a week, any time of day, with or without food.
• Stick to the same day each week for consistency.
• If you need to change the day, wait at least 3 days (72 hours) between doses.

Important: Always follow your prescriber’s advice to ensure Mounjaro is safe and effective for your treatment plan.

To keep your Mounjaro (tirzepatide) pens safe and effective, it’s important to follow proper storage and disposal steps. For a detailed overview, see our Mounjaro storage and temperature guide.

Storage Instructions

• Fridge (recommended): Store between 2°C and 8°C in the original packaging to protect from light.
• Room temperature: Can be kept below 30°C for up to 21 days. Do not use if left unrefrigerated for longer.
• Do not freeze: Pens that have been frozen should not be used.

Expiry Information

• Mounjaro pens have an expiry date printed on the packaging.
• Do not use after this date, as the medication may no longer be effective.
• Always check the date before each injection.

How to Dispose of Used Pens

• Place used pens in a sharps disposal container. These are available from pharmacies or healthcare providers.
• Do not throw used pens in household or recycling bins.
• Follow local guidelines for safe medical waste disposal.

Tip: Proper storage and disposal help ensure your treatment stays safe, effective, and environmentally responsible.

When using Mounjaro (tirzepatide) for weight loss, always follow your healthcare provider’s instructions. The dose is gradually increased over time to help your body adjust and reduce side effects.

Mounjaro Dosage Schedule

Mounjaro is taken once a week. Your prescriber will usually start you on a low dose and increase it gradually, based on how well you respond:

Need more help with your dosing schedule? Visit our Mounjaro Dosing and Titration Guide.

What If You Miss a Dose?

• Take the missed dose within 4 days (96 hours) of your usual time.
• If more than 4 days have passed, skip the missed dose and wait for your next scheduled injection.
• Do not take two doses within three days of each other.

If you’re unsure what to do, speak to your doctor or pharmacist.

How Long Does One Mounjaro Pen Last?

• Each KwikPen contains four doses – one pen lasts four weeks when used as directed.
• If kept at room temperature (below 30°C), use within 21 days.

Sticking to your prescribed dose and injection schedule is key to getting the best results with Mounjaro. Always check with your prescriber before making any changes to your treatment plan.

The '5th Dose'

After the fourth dose, you may notice some liquid left in the pen. This is a buffer, not an extra dose, and should not be used. Using a fifth dose could lead to underdosing or overdosing, which may reduce effectiveness or increase side effects. For full details, read our guide on why you should not use a fifth dose of Mounjaro.

What if I can’t tolerate my current Mounjaro dose?

If you’re experiencing persistent side effects like nausea, vomiting or diarrhoea after increasing your Mounjaro® dose, speak to your healthcare provider. They may advise staying on your current dose for longer or reducing it to improve your tolerance.

It's important not to increase your dose until your body is ready. Your healthcare provider can also offer practical tips to manage symptoms and get the best results from your treatment.

If you’re worried about your symptoms, consult a medical professional or read the Patient Information Leaflet for more information.

Important Safety Information

Before starting Mounjaro (tirzepatide), it’s important to understand the safety considerations and who may not be suitable for this treatment.

Who Should Be Cautious?

• Thyroid Cancer Risk: Avoid Mounjaro if you or a close family member has a history of medullary thyroid carcinoma (MTC) or MEN 2 syndrome, due to a possible link between the medication and thyroid tumours.
• Digestive Conditions: Not recommended for people with gastroparesis, as Mounjaro slows stomach emptying.
• Pancreatitis: Consult your doctor if you’ve previously had pancreatitis, as this may increase your risk of recurrence.
• Low Blood Sugar: If you’re taking insulin or sulphonylureas, Mounjaro may cause hypoglycaemia. Regular blood glucose monitoring is advised.
• Eye Health: Speak to your doctor if you have diabetic retinopathy, as Mounjaro may worsen vision issues in some cases.

Who Can Take Mounjaro?

Mounjaro is licensed for adults (18+) with:

• A BMI of 30 or above (obesity)
• A BMI of 27 or above (overweight) with at least one weight-related condition, such as prediabetes, high blood pressure, high cholesterol or heart disease

It should be used alongside a healthy diet and regular exercise for best results.

Who Should Not Take Mounjaro?

Mounjaro is not suitable if you:

• Are under 18
• Are pregnant, trying to conceive, or breastfeeding
• Have severe kidney or liver problems
• Have type 1 diabetes
• Are already using another GLP-1 receptor agonist (e.g. Ozempic, Saxenda, Wegovy)
• Have a history of thyroid cancer (MTC)
• Have severe digestive issues (such as gastroparesis)
• Have had pancreatitis
• Are allergic to tirzepatide or any other ingredients in Mounjaro

Pregnancy and Breastfeeding

• Pregnancy: Mounjaro is not recommended during pregnancy. Stop use at least one month before trying to conceive.
• Breastfeeding: It’s not known if Mounjaro passes into breast milk. Speak to your doctor before use.

Medication Interactions

Mounjaro may interact with prescription medicines, over-the-counter drugs, supplements or herbal products. Always inform your doctor about all treatments you're taking.

See the full interaction list on Drugs.com.

Monitoring and Reporting

Mounjaro is under enhanced safety monitoring in the UK. Report any side effects or unusual symptoms to your doctor or through the Yellow Card Scheme (MHRA).

Always read the full Patient Information Leaflet before starting treatment.

Can You Drink Alcohol on Mounjaro?

There are no known direct interactions between Mounjaro and alcohol, but it’s best to limit alcohol intake. Drinking may reduce the medication’s effectiveness and increase the risk of side effects. Learn more in our guide: Can You Drink Alcohol on Mounjaro?

What Are the Side Effects of Mounjaro (Tirzepatide)?

Mounjaro, like all medications, can cause side effects. While most people tolerate it well, others may experience mild or more serious reactions. Always follow medical advice and report anything unusual.

Common Side Effects

These side effects are usually temporary and improve as your body adjusts:

• Nausea or vomiting
• Diarrhoea or constipation
• Fatigue
• Dizziness or lightheadedness
• Bloating or gas
• Gallstones

Tip: Eating smaller meals and staying hydrated can help reduce stomach upset.

Serious Side Effects (Less Common)

• Pancreatitis: Severe stomach pain that may reach your back, with persistent vomiting.
  Action: Seek urgent medical attention.
• Severe allergic reaction (anaphylaxis): Swelling of the face, lips or tongue, or difficulty breathing.
  Action: Call 999 or go to A&E.
• Gallbladder issues: Ongoing stomach pain, jaundice, or fever.
  Action: Contact your GP.
• Low blood sugar (hypoglycaemia): Especially if taken with insulin or certain diabetes medicines. Symptoms include shaking, sweating, fast heartbeat, or confusion.
  Action: Eat something sugary and seek medical help.
• Vision changes: Any eyesight issues should be assessed by a healthcare provider.
• Kidney problems: Especially if dehydrated from vomiting or diarrhoea. Signs include dark urine or reduced urination.
  Action: Stay hydrated and consult a doctor.

What to Do if You Have Side Effects

• Mild symptoms: Usually settle with rest, fluids, and smaller meals.
• Severe symptoms: Stop using Mounjaro and seek immediate medical attention.

Reporting Side Effects

Tell your doctor, pharmacist or nurse if you notice anything unusual. You can also report side effects through the MHRA Yellow Card Scheme.

For a full list of side effects, refer to the Patient Inf

If Mounjaro isn’t the right fit, other prescription options are available, including:

• Wegovy (semaglutide)
• Saxenda (liraglutide)
• Orlistat (also known as Xenical or Alli)

Each medicine works differently. Your prescriber can help you choose the most suitable option based on your health and weight loss goals.

Weight Loss Injection Comparison

Mounjaro Compared to Other Weight Loss Injections

Mounjaro vs Wegovy

• Ingredients: Tirzepatide (Mounjaro) vs Semaglutide (Wegovy)
• Mechanism: Mounjaro targets both GLP-1 and GIP hormones, potentially offering added benefit
• Effectiveness: Both are highly effective, though Wegovy has longer-term safety data available

For a full breakdown, visit our Mounjaro vs Wegovy guide.

Mounjaro vs Saxenda

• Ingredients: Tirzepatide (Mounjaro) vs Liraglutide (Saxenda)
• Dosing: Mounjaro is injected once weekly; Saxenda is taken daily
• Mechanism: Mounjaro’s dual-hormone action may support greater appetite control

Mounjaro vs Ozempic

• Purpose: Mounjaro is licensed for weight loss in the UK; Ozempic is used for type 2 diabetes
• Mechanism: Ozempic works via GLP-1 only; Mounjaro targets GLP-1 and GIP

Explore our Mounjaro vs Ozempic comparison for full details.

Switching Between Weight Loss Medications

• Switching from Wegovy: A 4-week washout is generally advised
• Switching from Ozempic: Your prescriber can recommend a safe transition plan

Not sure which treatment is right for you? Speak to a registered independent prescriber during your online consultation. You can also find helpful resources on the UK Meds blog.

UK Meds is committed to providing you with the most accurate information possible regarding healthcare and lifestyle, as outlined in our Editorial Policy and Content Policy. We aim to regularly peer review and update our content as necessary to give you the most up-to-date medical information, helping you to be fully informed before starting a consultation with a registered prescriber for the treatment that you need.

Please note that our content is not a substitute for professional medical advice. Before starting any treatment or making any changes that could affect your lifestyle, you should always speak with your doctor, pharmacist or healthcare provider to ensure that it is safe and suitable for you.

16th July 2025

• Mounjaro - What is Mounjaro
• Ell Lilly & Company - Mounjaro Media Kit
• Drugs.com - Mounjaro
• WebMD - Mounjaro Subcutaneous
• Pan Mersey APC - Tirzepatide T2DM
• Medicines.org.uk - Mounjaro (Summary of Product Characteristics)
• UK Government - Mounjaro KwikPen Approval
• NICE - TA924
• BNF - Tirzepatide
• EMA - Mounjaro
• ScienceDirect - Tirzepatide

• A UK Guide To Buy Mounjaro Online - A step-by-step guide on how to order Mounjaro in the UK with a valid prescription.
• Is Mounjaro Available in the UK? - Learn about the availability of Mounjaro in the UK.
• Mounjaro NHS Availability - Information about whether Mounjaro is available through the NHS.
• Mounjaro Prescription Requirements in the UK - Find out what's needed to get a prescription for Mounjaro.
• Do You Need a Prescription for Mounjaro? - Explains why a prescription is required for Mounjaro.
• Choosing an Online Prescription Service for Mounjaro - Advice on selecting a trusted online service for Mounjaro.
• Mounjaro Weight Loss: Success Stories and User Experiences - Read about how people have successfully used Mounjaro for weight loss and their experiences.
• UK Patient Reviews and Testimonials for Mounjaro - Discover what UK patients have to say about using Mounjaro for weight management.
• Mounjaro Timeline: How Long Does It Take to See Results? - Learn how long it typically takes to see weight loss results when using Mounjaro.
• How to Take Mounjaro - Simple instructions on using Mounjaro safely and effectively.
• Mounjaro Dosing Schedule and Titration - A guide to understanding the correct dosing plan for Mounjaro.
• Is Mounjaro or Ozempic Better? - A comparison to help you decide which medication suits your needs.
• Mounjaro vs Wegovy - Compare these two weight-loss injections side by side.
• Weight Loss Injections Comparison - A detailed comparison of Mounjaro, Wegovy, and Saxenda.
• Guide to Zepbound Weight Loss Injections - A guide to another option for weight loss injections in the UK.
• Why Am I Not Losing Weight on Mounjaro? - Possible reasons and solutions for slow weight loss progress.
• Do You Gain Weight Back After Stopping Mounjaro? - Information on what happens when you stop using Mounjaro.
• Is Tirzepatide Approved for Weight Loss? - Learn about the regulatory status of Tirzepatide for weight loss.
• Side Effects: Wegovy, Saxenda, and Mounjaro - A comparison of potential side effects for these injections.
• How Long Do Mounjaro Side Effects Last? - Answers to questions about managing Mounjaro side effects.
• Why is There a Shortage of Mounjaro? - Understand the reasons behind supply challenges for Mounjaro.
• Buying Mounjaro in London - Where to purchase Mounjaro in London.
• Buying Mounjaro in Birmingham - Tips for purchasing Mounjaro in Birmingham.
• Buying Mounjaro in Manchester - Find out where to order Mounjaro in Manchester.
• Buying Mounjaro in Glasgow - Guidance for accessing Mounjaro in Glasgow.
• Buying Mounjaro in Leeds - Information on purchasing Mounjaro in Leeds.