Skip to product information
1 of 2

  • Images are for illustration purposes only

Mounjaro Weight Loss Injections (Tirzepatide) KwikPen

Mounjaro Weight Loss Injections (Tirzepatide) KwikPen

  • 1. Ozempic®️-equivalent therapy now available for weight management
  • 2. Average weight loss of 17%, with 1 in 3 patients achieving over 20%
  • 3. May help reduce osteoarthritis-related pain
  • 4. Wegovy®️ is not expected to impact the effectiveness of oral contraceptives
  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Once-weekly injection for sustained, clinically meaningful weight loss
  • ✔️ Dual GIP and GLP-1 action reduces appetite and calorie intake
  • ✔️ Dose escalation from 2.5 mg to 15 mg for personalised treatment
  • ✔️ Pre-filled KwikPen auto-injector for simple, accurate self-injection
  • ✔️ Suitable for adults with BMI ≥30 or ≥27 with weight-related conditions

Price Checker

Regular price £145.00
Sale price £145.00
Sale Sold out
  • Lowest price guarantee
  • Includes FREE private prescription
View full details

 

What Is the Mounjaro Weight Loss Injection?

 

The mounjaro weight loss injection is a once-weekly subcutaneous injection containing tirzepatide, a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist. Developed by Lilly, it was approved by the Medicines and Healthcare products Regulatory Agency (MHRA) for chronic weight management in adults in the UK. If you have been struggling with your weight despite diet and exercise changes, this treatment may be worth discussing with a clinician. You can explore the full range of options available through our weight loss collection.

Mounjaro is available in the KwikPen format — a pre-filled, single-use auto-injector that makes self-administration straightforward. Each pen delivers a precise, fixed dose, removing the need for manual drawing up of medication. It comes in multiple strengths to support a gradual dose escalation approach, which helps your body adjust and reduces the likelihood of side effects.

 

How Does the Mounjaro KwikPen Work in the Body?

 

Tirzepatide works through a dual mechanism that sets it apart from earlier weight loss injections. Here is how it acts step by step:

  • GLP-1 receptor activation: Slows gastric emptying, reduces appetite, and lowers post-meal blood glucose levels.
  • GIP receptor activation: Enhances insulin secretion in a glucose-dependent manner and may improve fat metabolism.
  • Hypothalamic signalling: Both pathways signal to the brain's appetite-regulating centres, reducing hunger and increasing feelings of fullness.
  • Caloric intake reduction: The combined effect leads to a meaningful reduction in daily calorie consumption over time.

Because tirzepatide targets two separate receptor pathways simultaneously, it produces a more pronounced effect on appetite and weight than single-receptor agents. Clinical trial data from the SURMOUNT programme demonstrated significant average body weight reductions in participants using tirzepatide compared to placebo.

 

Who Is Suitable for the Mounjaro Tirzepatide Injection?

 

Mounjaro is a prescription-only medicine, so a clinical assessment is required before it can be dispensed. It is indicated for adults who meet specific criteria and are committed to making lifestyle changes alongside treatment. It is not a standalone solution — it works best when combined with a calorie-controlled diet and regular physical activity.

You may be suitable for Mounjaro if you:

  • Have a BMI of 30 kg/m² or above (obesity)
  • Have a BMI of 27 kg/m² or above with at least one weight-related comorbidity, such as type 2 diabetes, hypertension, or dyslipidaemia
  • Are an adult aged 18 or over
  • Have not responded adequately to diet and lifestyle interventions alone

 

How Does Mounjaro Compare to Other Weight Loss Injections?

 

Feature Mounjaro (Tirzepatide) Ozempic / Wegovy (Semaglutide)
Receptor targets GIP + GLP-1 (dual agonist) GLP-1 only
Dosing frequency Once weekly Once weekly
Available strengths 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg 0.25 mg to 2.4 mg (semaglutide)
Device type Pre-filled KwikPen auto-injector Pre-filled pen

 

How Should You Store the Mounjaro KwikPen?

 

Correct storage is essential to maintain the integrity of the medication. Keep your Mounjaro KwikPen in the refrigerator at 2°C to 8°C until you are ready to use it. Do not freeze it — if a pen has been frozen, discard it. Once removed from the fridge, the pen can be stored at room temperature below 30°C for up to 21 days. Always keep it in the original carton to protect it from light.

If you are also managing blood glucose levels alongside your weight, it may be helpful to browse our diabetes monitoring range for compatible testing supplies. Never use a pen that appears cloudy, discoloured, or contains visible particles. Check the expiry date before each injection and dispose of used pens safely in a sharps bin.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Mounjaro Weight Loss Injections (Tirzepatide) KwikPen specifications
Treatment category Chronic weight management
Active ingredient Tirzepatide
Mechanism of action Dual GIP and GLP-1 receptor agonist
Drug class Incretin mimetic
Preparation Solution for injection
Route of administration Subcutaneous injection
Strengths 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg
Pack sizes 4 pre-filled KwikPens (4-week supply)
UK classification Prescription Only Medicine (POM)
Suitable for Adults aged 18 and over with BMI ≥30, or ≥27 with weight-related comorbidity
Effective When used alongside a reduced-calorie diet and increased physical activity

Specifications of Mounjaro Weight Loss Injections (Tirzepatide) KwikPen

 

What Is Mounjaro and What Is It Used For?

 

Mounjaro (tirzepatide) is a prescription-only injectable medicine used for chronic weight management in adults. It belongs to a class of medicines known as incretin mimetics and works by mimicking the actions of two naturally occurring gut hormones — GIP and GLP-1 — that regulate appetite and blood sugar. The NHS recognises obesity as a complex, long-term condition, and treatments like tirzepatide are intended to support sustained weight loss as part of a broader lifestyle programme.

Mounjaro is not a quick fix. It is designed for people who have not achieved adequate weight loss through diet and exercise alone and who meet the clinical criteria for treatment. It is injected once weekly under the skin, typically in the abdomen, thigh, or upper arm.

 

What Do You Need to Know Before Using Mounjaro?

 

Before starting Mounjaro, your prescriber will review your full medical history. There are important contraindications and warnings to be aware of:

  • Do not use if you have a personal or family history of medullary thyroid carcinoma (MTC)
  • Do not use if you have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2)
  • Do not use if you are pregnant, planning to become pregnant, or breastfeeding
  • Use with caution if you have a history of pancreatitis — seek immediate medical advice if you develop severe abdominal pain
  • Not recommended for people with severe gastrointestinal disease, including gastroparesis
  • Use with caution in people with diabetic retinopathy, as rapid glucose improvements may temporarily worsen this condition
  • Not indicated for type 1 diabetes

The following medicines may interact with Mounjaro and should be discussed with your prescriber or pharmacist:

  • Insulin and sulfonylureas — increased risk of hypoglycaemia when used together
  • Oral contraceptives — tirzepatide may reduce absorption; additional contraceptive precautions may be needed for four weeks after starting or dose escalation
  • Other medicines with narrow therapeutic windows that depend on consistent gastric absorption

 

How Should You Use the Mounjaro KwikPen?

 

Always follow your prescriber's instructions. The general dosing approach for Mounjaro follows a gradual escalation schedule to minimise gastrointestinal side effects. Here are the steps for using the KwikPen:

  1. Remove the pen from the fridge and allow it to reach room temperature for approximately 30 minutes before injecting.
  2. Wash your hands thoroughly with soap and water.
  3. Choose your injection site — abdomen, front of thigh, or upper arm. Rotate sites each week.
  4. Clean the skin with an alcohol swab and allow it to dry.
  5. Remove the base cap from the KwikPen and press firmly against the skin until you hear a click.
  6. Hold the pen in place for at least 10 seconds to ensure the full dose is delivered.
  7. Dispose of the used pen in a sharps bin immediately after use.
Treatment Week Dose Frequency
Weeks 1–4 2.5 mg Once weekly
Weeks 5–8 5 mg Once weekly
Weeks 9–12 7.5 mg Once weekly
Weeks 13–16 10 mg Once weekly
Weeks 17–20 12.5 mg Once weekly
Week 21 onwards 15 mg (maximum) Once weekly

 

What Are the Possible Side Effects of Mounjaro?

 

Like all medicines, Mounjaro can cause side effects, though not everyone experiences them. Gastrointestinal effects are the most frequently reported and are usually most noticeable during dose escalation. If nausea is a concern, eating smaller meals and avoiding high-fat foods can help. You might also find it useful to browse our sickness and nausea range for supportive remedies.

Common side effects (may affect more than 1 in 10 people):

  • Nausea
  • Diarrhoea
  • Vomiting
  • Constipation
  • Reduced appetite
  • Abdominal discomfort or bloating

Less common side effects (may affect up to 1 in 10 people):

  • Injection site reactions (redness, itching, bruising)
  • Fatigue
  • Dizziness
  • Hypoglycaemia (particularly if used with insulin or sulfonylureas)
  • Hair loss (telogen effluvium — often temporary and related to rapid weight loss)
  • Gastro-oesophageal reflux

Seek urgent medical attention if you develop severe abdominal pain that does not resolve, as this may indicate pancreatitis. Allergic reactions, though rare, require immediate medical assessment.

 

How Should You Store Mounjaro?

 

  • Store in a refrigerator at 2°C to 8°C before first use
  • Do not freeze — discard if accidentally frozen
  • Once removed from the fridge, store below 30°C for a maximum of 21 days
  • Keep in the original carton to protect from light
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the label
  • Dispose of used pens in an approved sharps container

If you are managing related digestive symptoms during treatment, our indigestion range may offer additional support. Always speak to your pharmacist before combining any over-the-counter products with your prescription treatment.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Mounjaro online in the UK?

You can buy Mounjaro online in the UK through a GPhC-registered online pharmacy such as Cured Pharmacy, following a clinical consultation to confirm you are suitable. Mounjaro is a prescription-only medicine, so it cannot legally be dispensed without a valid prescription issued by a qualified prescriber. Always ensure the pharmacy you use is registered with the GPhC and displays the EU common logo on its website.

How does Mounjaro work for weight loss in the body?

Mounjaro contains tirzepatide, which activates both GIP and GLP-1 receptors — two gut hormone pathways involved in appetite regulation and blood sugar control. By stimulating both receptors simultaneously, it reduces hunger signals sent to the brain, slows the rate at which food leaves the stomach, and helps the body use insulin more effectively. The result is a sustained reduction in calorie intake and, over time, meaningful weight loss.

How do I use the Mounjaro KwikPen step by step?

Remove the pen from the fridge and let it warm to room temperature for around 30 minutes before injecting. Choose an injection site — abdomen, front of thigh, or upper arm — clean the skin with an alcohol swab, then press the pen firmly against the skin until you hear a click and hold for at least 10 seconds. Rotate your injection site each week to avoid skin reactions, and always dispose of used pens in a sharps bin immediately after use.

What is the starting dose of Mounjaro and how does it increase?

The starting dose of Mounjaro is 2.5 mg once weekly for the first four weeks, which allows your body to adjust gradually and reduces the risk of gastrointestinal side effects. After four weeks, the dose is typically increased to 5 mg once weekly, with further increases in 2.5 mg steps every four weeks as tolerated. The maximum approved dose is 15 mg once weekly.

What is the best day of the week to inject Mounjaro?

You can choose any day of the week that suits your routine — the key is to inject on the same day each week to maintain consistent drug levels. Many people choose a day when they are at home and relaxed, in case they experience mild nausea after the injection. If you need to change your injection day, ensure there is a gap of at least three days between doses.

How do I manage the side effects of Mounjaro?

Nausea and digestive discomfort are the most common side effects and are usually most noticeable during the first few weeks or after a dose increase. Eating smaller, lower-fat meals, avoiding lying down immediately after eating, and staying well hydrated can all help reduce these symptoms. If side effects are severe or persistent, speak to your prescriber — they may recommend slowing the dose escalation schedule. You can also explore our sickness and nausea range for additional supportive options.

Who is eligible for Mounjaro weight loss treatment?

Mounjaro is indicated for adults aged 18 and over with a BMI of 30 kg/m² or above, or a BMI of 27 kg/m² or above alongside at least one weight-related health condition such as type 2 diabetes, high blood pressure, or high cholesterol. It is not suitable for people who are pregnant, breastfeeding, or who have a personal or family history of medullary thyroid carcinoma or MEN 2. A clinical consultation is required to confirm eligibility before a prescription can be issued.

What happens if I miss a dose of Mounjaro?

If you miss your weekly Mounjaro injection and it has been fewer than four days since your scheduled dose day, inject it as soon as you remember. If more than four days have passed since the missed dose, skip it entirely and resume your regular weekly schedule on the next planned injection day. Do not inject two doses within three days of each other.

How does Mounjaro compare to Ozempic or Wegovy for weight loss?

Mounjaro (tirzepatide) targets both GIP and GLP-1 receptors, while Ozempic and Wegovy (semaglutide) act only on GLP-1 receptors. Data from the SURMOUNT clinical trial programme showed that tirzepatide produced greater average percentage body weight reductions than semaglutide in head-to-head comparisons, though individual responses vary. Both are once-weekly injections, but they have different dose escalation schedules and side effect profiles — your prescriber can help you decide which is most appropriate for you.

How long do you stay on Mounjaro for weight loss?

Mounjaro is designed for long-term use as part of an ongoing weight management programme, and treatment duration is determined by your prescriber based on your progress, tolerability, and health goals. Clinical evidence suggests that stopping treatment can lead to weight regain, so any decision to discontinue should be made in consultation with your healthcare provider. Regular reviews are recommended to assess your response and adjust the plan as needed.

Can I use Mounjaro if I have type 2 diabetes?

Yes — tirzepatide was originally developed for the management of type 2 diabetes and has a well-established safety profile in this population. However, if you are already taking insulin or a sulfonylurea, your prescriber may need to adjust your diabetes medication to reduce the risk of hypoglycaemia. Always inform your prescriber of all medicines you are currently taking before starting Mounjaro. Our diabetes monitoring range can help you keep track of your blood glucose levels during treatment.

Will Mounjaro cause hair loss?

Some people experience temporary hair shedding (telogen effluvium) during treatment with Mounjaro, which is generally linked to rapid weight loss rather than the medication itself. This type of hair loss is usually temporary and resolves as your weight stabilises. If you are concerned about hair changes, speak to your GP or pharmacist for personalised advice.

Is Mounjaro safe to use long term?

Mounjaro has been evaluated in large-scale clinical trials lasting up to 72 weeks, and the available evidence supports its safety and tolerability for long-term use in appropriate patients. As with any prescription medicine, ongoing monitoring by a healthcare professional is important to identify any emerging concerns and to ensure the treatment continues to be suitable for you. Long-term safety data continues to accumulate as the medicine is used more widely in clinical practice.

What are the latest research findings on Mounjaro?

The SURMOUNT clinical trial programme, which included over 2,500 participants, demonstrated that tirzepatide at the 15 mg dose produced an average weight reduction of approximately 20–22% of body weight compared to placebo over 72 weeks. Subsequent studies have explored its use in people with obesity-related cardiovascular risk, sleep apnoea, and heart failure with preserved ejection fraction. Research into tirzepatide continues to expand, with ongoing trials examining its effects across a range of metabolic conditions.

Can I drink alcohol while using Mounjaro?

There is no absolute contraindication between Mounjaro and alcohol, but drinking alcohol can worsen gastrointestinal side effects such as nausea and vomiting, which are already common during dose escalation. Alcohol also contributes calories and can undermine the dietary changes that are central to the treatment programme. It is sensible to limit alcohol intake and discuss any concerns with your prescriber or pharmacist.

How Should You Use the Mounjaro KwikPen?

Using the Mounjaro KwikPen correctly ensures you receive the full dose and reduces the risk of injection site reactions. Always read the instructions provided with your pen before use, and ask your pharmacist or nurse to demonstrate the technique if you are injecting for the first time.

What Is the Correct Dose of Mounjaro?

Mounjaro follows a structured dose escalation schedule designed to minimise side effects while gradually increasing efficacy. Your prescriber will guide you through each stage, and dose increases should only be made as directed — never increase the dose faster than recommended.

When Is the Best Time to Use Mounjaro?

Mounjaro can be injected at any time of day, with or without food — there is no requirement to take it at a specific time relative to meals. The most important thing is consistency: choose a day of the week that fits your routine and stick to it, as this helps maintain stable drug levels throughout your treatment.

If you need to change your injection day, ensure there is a minimum gap of three days between your previous and new injection. Many people find it helpful to set a weekly reminder on their phone to avoid missing a dose.

How Long Can You Use Mounjaro For?

Mounjaro is intended for long-term use as part of a sustained weight management programme. Clinical trials have evaluated its use over periods of up to 72 weeks, and treatment is generally continued for as long as it remains effective and well tolerated. Your prescriber will review your progress regularly and advise on whether to continue, adjust, or stop treatment.

Weight regain is common after stopping tirzepatide, so any decision to discontinue should be made collaboratively with your healthcare team rather than abruptly. Lifestyle changes — including a balanced diet and regular physical activity — remain central to long-term success alongside medication.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

Customer Reviews

Based on 665 reviews
80%
(535)
9%
(60)
5%
(30)
1%
(8)
5%
(32)
A
Anonymous

So far it’s been good and cured pharmacy very competitive with the prices

A
Anonymous

I'm not finding them as effective as last time I used them but the higher strength ones are starting to work a little.

N
Natalie Warren

Great service

S
Susan Collins

started working immediately

A
Anonymous

Great am seeing improvement

What Are the Most Common Side Effects of Mounjaro?

The most frequently reported side effects of Mounjaro are gastrointestinal in nature and are most noticeable during the first few weeks of treatment or following a dose increase. They are generally mild to moderate in severity and tend to improve as your body adjusts to the medication.

  • Nausea
  • Diarrhoea
  • Vomiting
  • Constipation
  • Reduced appetite
  • Abdominal pain or discomfort
  • Bloating or flatulence

What Are the Less Common Side Effects of Mounjaro?

Less common side effects occur in a smaller proportion of people but are still worth being aware of before you start treatment. If any of the following persist or become troublesome, speak to your prescriber or pharmacist.

  • Injection site reactions — redness, bruising, itching, or swelling at the injection site
  • Fatigue or tiredness
  • Dizziness
  • Gastro-oesophageal reflux (heartburn)
  • Temporary hair shedding (telogen effluvium), usually related to rapid weight loss
  • Hypoglycaemia (low blood sugar) — particularly if used alongside insulin or sulfonylureas
  • Burping

What Are the Serious Side Effects of Mounjaro?

Serious side effects are uncommon but require prompt medical attention. Pancreatitis — inflammation of the pancreas — has been reported in people using GLP-1 receptor agonists. If you develop severe, persistent abdominal pain that may radiate to your back, stop using Mounjaro and seek urgent medical advice immediately.

There is a theoretical risk of thyroid C-cell tumours based on animal studies, which is why Mounjaro is contraindicated in people with a personal or family history of medullary thyroid carcinoma or MEN 2. Serious allergic reactions (anaphylaxis or angioedema) are rare but require emergency treatment. Signs include swelling of the face, lips, tongue, or throat, difficulty breathing, or a rapid heartbeat.

What Should You Do If You Experience Side Effects?

For mild gastrointestinal side effects, practical measures such as eating smaller meals, avoiding high-fat or spicy foods, and staying well hydrated can make a significant difference. If nausea is persistent, your prescriber may recommend slowing the dose escalation schedule rather than stopping treatment altogether.

Keep a note of any side effects you experience and when they occur, as this information will be useful at your next prescriber review. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Mounjaro Interact With Other Medicines?

Yes — Mounjaro can interact with certain medicines, and it is important to inform your prescriber and pharmacist of everything you are currently taking, including over-the-counter products and supplements. Because tirzepatide slows gastric emptying, it may affect the absorption rate of oral medicines taken at the same time.

The most clinically significant interactions include insulin and sulfonylureas (increased hypoglycaemia risk) and oral contraceptives (reduced absorption during the first four weeks of treatment or after a dose increase — additional contraceptive precautions may be required). Always seek advice before starting any new medicine while using Mounjaro.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Frequently Asked Question

It basically copies two natural hormones, GLP-1 and GIP, which help in the control blood sugar, reduce appetite as well, and support weight loss.

No. All are weight-loss injections, but Mounjaro is made with tirzepatide, while Ozempic/Wegovy is made with semaglutide. Research indicates Mounjaro could provide increased weight loss for certain individuals.

It is manufactured by Eli Lilly, a trusted globalpharmaceutical company.

Yes. It is registered for weight loss in people without diabetes who meet certain criteria.

No. Not for use in pregnancy or lactation.
It can be prescribed for people up to 85 years old, provided they are otherwise suitable and under medical supervision.
Once a week, On the same day
If it’s within 4 days, then no need to worry just try to take it as soon as possible. If it’s more than 4 days late then skip the missed dose and continue with your regular schedule.
Each KwikPen comes preloaded with 4 doses, lasting one month.
You should begin to see results within 4–6 weeks, with continued weight loss over time.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

We’re a safe and
regulated UK service

Registered Pharmacy Badge

Lowest Price Guarantee

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

100% discreet packaging

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

Agent

Need help?
Talk to our friendly experts now

How our service works

Service Setup

Service setup

Discreet Packaging

Discreet packaging

Express Delivery

Express delivery

What is Mounjaro?

It basically copies two natural hormones, GLP-1 and GIP, which help in the control blood sugar, reduce appetite as well, and support weight loss.

Do I need a prescription to order?

No. All are weight-loss injections, but Mounjaro is made with tirzepatide, while Ozempic/Wegovy is made with semaglutide. Research indicates Mounjaro could provide increased weight loss for certain individuals.

How do I place an order?

It is manufactured by Eli Lilly, a trusted globalpharmaceutical company.

What payment methods do you accept?

Yes. It is registered for weight loss in people without diabetes who meet certain criteria.

Can I use Mounjaro if I am pregnant or breastfeeding? No. Not for use in pregnancy or lactation. Is Mounjaro suitable for older adults? It can be prescribed for people up to 85 years old, provided they are otherwise suitable and under medical supervision. How often do I take Mounjaro? Once a week, On the same day