Cheapest Mounjaro prices in the UK — locked in for as long as possible.
We’ve secured competitively priced stock and will continue passing every saving directly onto patients while current supply lasts. All strengths currently in stock and available now.
• Prefilled injection pens with 4 weekly doses.
• Approved for weight loss in UK
• Lowest price from £32 per week
• 2.5 mg, 5mg, 7.5 mg, 10 mg ,12.5 mg and 15 mg. Available Now!
• Alternative weight loss option – Wegovy
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You can buy Mounjaro, the latest GLP-1 weekly weight loss injections from Pharmacy Planet, a registered online pharmacy based in the UK. It is approved for weight loss treatment in the UK and prescribed for adults with obesity (BMI of 30+) and for those with a BMI of 27 or above with health conditions such as high blood pressure, high cholesterol and type 2 diabetes.
Complete the simple online consultation and start your weight loss journey with Pharmacy Planet.
Mounjaro is the brand name for the drug tirzepatide, an approved for weight loss drug in the UK. The prescription only medicine helps control appetite and reduce cravings, making you feel fuller for longer. As a result of reduced calorie intake and increased physical activity, effective weight loss can be achieved in patients.
Mounjaro Overview
Tirzepatide, the active ingredient in Mounjaro, belongs to a class of drugs called GLP-1 and GIP receptor agonists. These drugs mimic the naturally occurring hormone GLP-1 which is released in the gut after a meal to suppress hunger. It also slows down gastric emptying to make you feel fuller for longer. This results in reduced intake of food which can lead to weight loss.
Mounjaro prevents the conversion of excess sugar into fat by regulating blood sugar levels in our body. It is usually prescribed when lifestyle modifications have not been effective in weight loss.
It is important to follow a Mounjaro dosage plan to make sure that the medication is taken regularly to achieve the maximum weight loss and lessen the chances of side effects
Mounjaro dosing schedule
If you are a first-time user, start at the lowest dose of 2.5mg per week for 4 weeks. As long as you are tolerating the medicine, your dose will increase to 5mg per week for the next 4 weeks and then to 7.5mg per week for 4 weeks. The dose can increase again to 10mg per week for 4 weeks, then 12.5mg for 4 weeks, and finally to 15mg per week. You can remain on this dose until your target weight is reached. This is known as the maintenance dose.
Sticking to the dosing regimen of once weekly until reaching your goal weight is imperative.
The potential for serious side effects is heightened when Mounjaro is misused. It is important to consult your healthcare provider before adjusting your dosage outside the established dosing schedule and to discuss side effects that might be affecting you.
If you are ordering Mounjaro for first time, each pen will have 4 weekly doses (one dose per week) lasting for 28 days. It is important to keep it refrigerated at 2-8C between uses, however, if kept outside of refrigerate conditions, the pen will be stable for at least 4 weeks before its effectiveness begins to be affected.
Each pack of Mounjaro consist of:
· Four needles
· One Mounjaro Pen (4 doses)
· Patient information leaflet and Instruction leaflet
Mounjaro must be injected under the skin (Subcutaneously) in your stomach (abdomen), thigh or upper arm part of your body. Make sure the selected injection site area is clean before inserting the needle.
· Remove the pen cap and clean the end (where needle will be inserted) with a swab.
· Take one needle from the pack, peel off the paper cover, and firmly push and twist the needle cap until it is securely attached to the Mounjaro Pen. Now remove the plastic cap.
· Twist the pen until the first line appears in the Window. Hold the pen upside down and twist until a small liquid drop appears at the tip of the needle.
· Twist the plunger until the number one appears in the treatment window.
· Once the injection site is chosen, insert the pen at a 90-degree angle and push down the plunger gently until the zero appears again in the treatment window. Hold the needle in place for 10 seconds to make sure the full dose is administered.
· Remove the needle and close the Mounjaro pen with plastic cap. Safely dispose of the needle.
· Keep the pen stored safely for your next dose.
Important Instructions:
· Always check the expiration date and ensure it is not frozen or damaged before opening the pen.
· A new needle needs to be inserted each time.
The best place to inject Mounjaro are the fleshier areas of your body. This includes your stomach (at least 5 cm away from belly button), thigh or upper arm area. It is important to rotate the injection site as inserting the needle in same place every time can cause irritation.
You may notice a small amount of medication remaining in the pen after the fourth injection. This is normal and is included to allow the pen to be primed before each use. The pen is still intended to provide four doses only, and any remaining liquid should not be used as an additional injection.
From April 2026, Eli Lilly is introducing a redesigned Mounjaro KwikPen that contains less excess medication. The update is intended to reduce the amount of liquid remaining in the pen after the fourth injection.
With the new design, there should be little or no medication left in the pen once all four doses have been used. This means the so-called “golden dose” or “fifth dose” that some patients noticed with older pens is expected to disappear.
The medication, dosing schedule, and how the injection works will remain the same. The change only affects the pen mechanism and amount of excess liquid included for priming.
Like any other medications, Mounjaro also can cause side effects.
The most common side effects of Mounjaro include:
· Diarrhoea
· Feeling sickness or fatigue
· Nausea and Vomiting
· Constipation
· Rashes or Pain in injected body areas
These symptoms are more likely to disappear over the time since your body slowly gets adjusted to the medication.
If the symptoms remain same or becomes severe, please consult your clinician or local healthcare provider immediately.
Like Mounjaro , there are other GLP- 1 medicines available for weight loss treatment in the UK. See the list of options below:
Injectable Medications:
Wegovy is considered as one of the best alternatives for Mounjaro. Wegovy contains active ingredient semaglutide which belong to the same category of GLP-1 receptor agonist. Wegovy does have a more well-known counterpart, known as Ozempic. However, Ozempic is only licensed for use for patients with Type 2 Diabetes.
You can compare Mounjaro vs Wegovy and Ozempic Vs Mounjaro to understand their mechanisms, dosages and effects to help choose the right medication for you.
Mounjaro (weekly injectable pen), is usually prescribed for patients who fit the following criteria:
· Has to be aged 18-75 years old.
· Is diagnosed with obesity or has a BMI that is 30 or above.
· BMI of 27 – 30 with at least one weight related condition like prediabetes, hypertension, high cholesterol or heart problems
Mounjaro is not recommended or prescribed if you are:
· Below 18 years.
· Pregnant or breastfeeding.
· Having any kidney or liver related conditions
· Suffering from Inflammation of the pancreas (Pancreatitis), diabetic retinopathy, macular oedema, or other eye problems.
· History of thyroid issues or medullary thyroid carcinoma (MTC), or if there is a family history of MTC.
· Diagnosed with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
· Allergic to any of the ingredients used in Mounjaro.
Common side effects caused by Mounjaro should not be severe and starts disappearing over time. Side effects like Nausea, diarrhoea and heart burn can be resolved by following the tips below:
Once you stop taking Mounjaro , the appetite is expected to be back to normal gradually. Also, weight regain is possible if you don’t follow healthy diet and involve in regular physical exercises. Remember, Mounjaro is not a medicine you take for life. It is designed to help the user develop a healthier, sustainable lifestyle. Once you come off of this medicine, it is important to stay consistent with diet and exercise.
You can take Mounjaro at any time of the day. But it is important inject on the same day each week to ensure you receive the dosage regularly and to minimise potential side effects.
If you are using Mounjaro for the first time, you may start to notice weight loss within your first few weeks of the initial starting dose. The rate of weight loss in any individual depends on their age, physical activity and diet. However, if you haven’t lost 5% of your body weight within the first 6 months, then a discussion with your clinician should be had to consider alternative treatment options.
Emerging research has highlighted the cancer-preventing potential of GLP-1 receptor agonists, commonly used in weight loss injections. These medications, already popular for their role in managing obesity and type 2 diabetes, are now showing promising results in reducing the risk of obesity-linked cancers.
The study, led by Clalit Health Services, involved 6,356 adults undergoing treatment for obesity and type 2 diabetes. Participants were split into two groups: one group received bariatric surgery, while the other was treated with first-generation GLP-1-based injections such as liraglutide, exenatide, or dulaglutide. Over a follow-up period of 7.5 years, 298 individuals from across both cohorts were diagnosed with cancers associated with excess weight.
Interestingly, when researchers accounted for weight loss outcomes, GLP-1 treatments emerged slightly more protective, cutting cancer risk by 41% compared to a 38% reduction seen in the surgery group. Based on this combined evidence, scientists suggest that GLP-1 medications alone may reduce the likelihood of developing obesity-related cancers by nearly 50%.
If you’re using Mounjaro® (tirzepatide)—a GLP-1 weight loss injection available in the UK—it’s important to know it may reduce the effectiveness of oral birth control. This happens because Mounjaro can delay the absorption of the oral contraceptive pill, meaning your body might not absorb enough to prevent pregnancy. To stay protected, you should use a barrier method of contraception, such as condoms or an IUD, for four weeks after starting Mounjaro and after each dose increase. This guidance is specific to tirzepatide, which acts differently from other GLP-1 medications. Alternatively, you may want to switch to a non-oral form of contraception while using Mounjaro. For more details, refer to the official NHS guidance on weight loss injections .
You can buy Mounjaro, the latest GLP-1 weekly weight loss injections from Pharmacy Planet, a registered online pharmacy based in the UK. It is approved for weight loss treatment in the UK and prescribed for adults with obesity (BMI of 30+) and for those with a BMI of 27 or above with health conditions such as high blood pressure, high cholesterol and type 2 diabetes.
Complete the simple online consultation and start your weight loss journey with Pharmacy Planet.
Mounjaro is the brand name for the drug tirzepatide, an approved for weight loss drug in the UK. The prescription only medicine helps control appetite and reduce cravings, making you feel fuller for longer. As a result of reduced calorie intake and increased physical activity, effective weight loss can be achieved in patients.
Mounjaro Overview
Tirzepatide, the active ingredient in Mounjaro, belongs to a class of drugs called GLP-1 and GIP receptor agonists. These drugs mimic the naturally occurring hormone GLP-1 which is released in the gut after a meal to suppress hunger. It also slows down gastric emptying to make you feel fuller for longer. This results in reduced intake of food which can lead to weight loss.
Mounjaro prevents the conversion of excess sugar into fat by regulating blood sugar levels in our body. It is usually prescribed when lifestyle modifications have not been effective in weight loss.
It is important to follow a Mounjaro dosage plan to make sure that the medication is taken regularly to achieve the maximum weight loss and lessen the chances of side effects
Mounjaro dosing schedule
If you are a first-time user, start at the lowest dose of 2.5mg per week for 4 weeks. As long as you are tolerating the medicine, your dose will increase to 5mg per week for the next 4 weeks and then to 7.5mg per week for 4 weeks. The dose can increase again to 10mg per week for 4 weeks, then 12.5mg for 4 weeks, and finally to 15mg per week. You can remain on this dose until your target weight is reached. This is known as the maintenance dose.
Sticking to the dosing regimen of once weekly until reaching your goal weight is imperative.
The potential for serious side effects is heightened when Mounjaro is misused. It is important to consult your healthcare provider before adjusting your dosage outside the established dosing schedule and to discuss side effects that might be affecting you.
If you are ordering Mounjaro for first time, each pen will have 4 weekly doses (one dose per week) lasting for 28 days. It is important to keep it refrigerated at 2-8C between uses, however, if kept outside of refrigerate conditions, the pen will be stable for at least 4 weeks before its effectiveness begins to be affected.
Each pack of Mounjaro consist of:
· Four needles
· One Mounjaro Pen (4 doses)
· Patient information leaflet and Instruction leaflet
Mounjaro must be injected under the skin (Subcutaneously) in your stomach (abdomen), thigh or upper arm part of your body. Make sure the selected injection site area is clean before inserting the needle.
· Remove the pen cap and clean the end (where needle will be inserted) with a swab.
· Take one needle from the pack, peel off the paper cover, and firmly push and twist the needle cap until it is securely attached to the Mounjaro Pen. Now remove the plastic cap.
· Twist the pen until the first line appears in the Window. Hold the pen upside down and twist until a small liquid drop appears at the tip of the needle.
· Twist the plunger until the number one appears in the treatment window.
· Once the injection site is chosen, insert the pen at a 90-degree angle and push down the plunger gently until the zero appears again in the treatment window. Hold the needle in place for 10 seconds to make sure the full dose is administered.
· Remove the needle and close the Mounjaro pen with plastic cap. Safely dispose of the needle.
· Keep the pen stored safely for your next dose.
Important Instructions:
· Always check the expiration date and ensure it is not frozen or damaged before opening the pen.
· A new needle needs to be inserted each time.
The best place to inject Mounjaro are the fleshier areas of your body. This includes your stomach (at least 5 cm away from belly button), thigh or upper arm area. It is important to rotate the injection site as inserting the needle in same place every time can cause irritation.
You may notice a small amount of medication remaining in the pen after the fourth injection. This is normal and is included to allow the pen to be primed before each use. The pen is still intended to provide four doses only, and any remaining liquid should not be used as an additional injection.
From April 2026, Eli Lilly is introducing a redesigned Mounjaro KwikPen that contains less excess medication. The update is intended to reduce the amount of liquid remaining in the pen after the fourth injection.
With the new design, there should be little or no medication left in the pen once all four doses have been used. This means the so-called “golden dose” or “fifth dose” that some patients noticed with older pens is expected to disappear.
The medication, dosing schedule, and how the injection works will remain the same. The change only affects the pen mechanism and amount of excess liquid included for priming.
Like any other medications, Mounjaro also can cause side effects.
The most common side effects of Mounjaro include:
· Diarrhoea
· Feeling sickness or fatigue
· Nausea and Vomiting
· Constipation
· Rashes or Pain in injected body areas
These symptoms are more likely to disappear over the time since your body slowly gets adjusted to the medication.
If the symptoms remain same or becomes severe, please consult your clinician or local healthcare provider immediately.
Like Mounjaro , there are other GLP- 1 medicines available for weight loss treatment in the UK. See the list of options below:
Injectable Medications:
Wegovy is considered as one of the best alternatives for Mounjaro. Wegovy contains active ingredient semaglutide which belong to the same category of GLP-1 receptor agonist. Wegovy does have a more well-known counterpart, known as Ozempic. However, Ozempic is only licensed for use for patients with Type 2 Diabetes.
You can compare Mounjaro vs Wegovy and Ozempic Vs Mounjaro to understand their mechanisms, dosages and effects to help choose the right medication for you.
Mounjaro (weekly injectable pen), is usually prescribed for patients who fit the following criteria:
· Has to be aged 18-75 years old.
· Is diagnosed with obesity or has a BMI that is 30 or above.
· BMI of 27 – 30 with at least one weight related condition like prediabetes, hypertension, high cholesterol or heart problems
Mounjaro is not recommended or prescribed if you are:
· Below 18 years.
· Pregnant or breastfeeding.
· Having any kidney or liver related conditions
· Suffering from Inflammation of the pancreas (Pancreatitis), diabetic retinopathy, macular oedema, or other eye problems.
· History of thyroid issues or medullary thyroid carcinoma (MTC), or if there is a family history of MTC.
· Diagnosed with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
· Allergic to any of the ingredients used in Mounjaro.
Common side effects caused by Mounjaro should not be severe and starts disappearing over time. Side effects like Nausea, diarrhoea and heart burn can be resolved by following the tips below:
Once you stop taking Mounjaro , the appetite is expected to be back to normal gradually. Also, weight regain is possible if you don’t follow healthy diet and involve in regular physical exercises. Remember, Mounjaro is not a medicine you take for life. It is designed to help the user develop a healthier, sustainable lifestyle. Once you come off of this medicine, it is important to stay consistent with diet and exercise.
If you are using Mounjaro for the first time, you may start to notice weight loss within your first few weeks of the initial starting dose. The rate of weight loss in any individual depends on their age, physical activity and diet. However, if you haven’t lost 5% of your body weight within the first 6 months, then a discussion with your clinician should be had to consider alternative treatment options.
You can take Mounjaro at any time of the day. But it is important inject on the same day each week to ensure you receive the dosage regularly and to minimise potential side effects.
Emerging research has highlighted the cancer-preventing potential of GLP-1 receptor agonists, commonly used in weight loss injections. These medications, already popular for their role in managing obesity and type 2 diabetes, are now showing promising results in reducing the risk of obesity-linked cancers.
The study, led by Clalit Health Services, involved 6,356 adults undergoing treatment for obesity and type 2 diabetes. Participants were split into two groups: one group received bariatric surgery, while the other was treated with first-generation GLP-1-based injections such as liraglutide, exenatide, or dulaglutide. Over a follow-up period of 7.5 years, 298 individuals from across both cohorts were diagnosed with cancers associated with excess weight.
Interestingly, when researchers accounted for weight loss outcomes, GLP-1 treatments emerged slightly more protective, cutting cancer risk by 41% compared to a 38% reduction seen in the surgery group. Based on this combined evidence, scientists suggest that GLP-1 medications alone may reduce the likelihood of developing obesity-related cancers by nearly 50%.
If you’re using Mounjaro® (tirzepatide)—a GLP-1 weight loss injection available in the UK—it’s important to know it may reduce the effectiveness of oral birth control. This happens because Mounjaro can delay the absorption of the oral contraceptive pill, meaning your body might not absorb enough to prevent pregnancy. To stay protected, you should use a barrier method of contraception, such as condoms or an IUD, for four weeks after starting Mounjaro and after each dose increase. This guidance is specific to tirzepatide, which acts differently from other GLP-1 medications. Alternatively, you may want to switch to a non-oral form of contraception while using Mounjaro. For more details, refer to the official NHS guidance on weight loss injections .
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*% of people losing more than 5% of body weight.
Eli Lilly, the manufacturer of Mounjaro (tirzepatide), has announced a price increase. When it first launched in the UK, it was introduced at a lower cost to support accessibility. The new pricing, effective September 2025, is designed to bring UK costs in line with other European countries.
You can get a Mounjaro prescription from Pharmacy Planet by completing the online clinical consultation. Our prescribers will review the answers to check if it is suitable for you before approving the order. As Pharmacy Planet is a private online pharmacy, we cannot fulfil other prescriptions from external sources.
No. To ensure fair access for all patients, we are only able to issue one pen per month per patient. This prevents stockpiling and ensures supply can continue.
If the cost of Mounjaro becomes too high, there are other treatments available. One option is Wegovy (semaglutide), which clinical studies show can help patients lose up to 15% of their body weight over 68 weeks. Wegovy is currently not affected by these price changes. A consultation with our clinical team can help you decide whether switching is suitable for you.
Not always. It depends on how far into your treatment you are, the dose you’ve reached, and how you’ve responded. In most cases, patients may not need to restart from the beginning, but a short break between medications is usually recommended. Your prescriber will guide you on the safest approach.
Yes, you can take Mounjaro if you do not have diabetes. However, you must meet the following requirements: • You must be aged 18-75 • Have a BMI that is over 30 -- or 27 or over for patients with weight impacting conditions. • You are not suffering from or have a history of pancreas or thyroid related health issues.
From 1st September 2025, Eli Lilly will adjust the list price across all strengths of Mounjaro. This affects all UK providers — including private clinics and online pharmacies. NHS patients will not see changes, but private patients should be aware that higher costs will apply. At Pharmacy Planet, we’ll keep patients updated directly if our pricing changes. As of 18th August 2025, Pharmacy Planet are aiming to keep our prices as low as possible for as long as we can.
No, they are not same even though they are used for weight loss treatments. The key difference is the active ingredients used in these drugs. Tirzepatide is used in Mounjaro while Semaglutide is present in Wegovy. Though they are part of the same family of medicines, both have shown different results depending on the individual and their response to the medicine.
All patients taking Mounjaro for the first time are required to commence their treatment with the 2.5mg strength. This is still the case even if you are currently using an alternative weight loss medicine (such as Wegovy). This makes sure your body can adjust to the new medicine gradually and minimizes the potential for side effects. If you are currently using another weight loss medicine (eg. Wegovy), a period of 4 weeks must elapse between your last dose of the current medicine and the first dose of Mounjaro. This is to ensure that your previous weight loss medicine has worked its way out of your system prior to initiating treatment with Mounjaro. Although Wegovy and Mounjaro come from the same family of medicines, they are separate distinct drugs which necessitates caution. So, in summary, patients new to Mounjaro should order the 2.5mg strength and ensure there is at least a 4 week gap between ending their current medicine and beginning on Mounjaro.
Please read the important safety precautions carefully, as well as other information regarding Mounjaro provided in the patient information leaflet. This can be found in the medication box, or you can use the link provided for a digital copy
Answer a few questions on your health and your fitness goals.
Our clinicians will review your clinical questionnaire to make sure treatment is right for you.
Once approved, you will access our wealth of experience and resources curated by our team and begin your clinical weight loss journey.
Start your weight loss journey heading in the right direction. Our team are here to help. Whether you’re unsure about which medicine is right for you or need help navigating the world of weight loss drugs, our team are on hand to help you make the right decision. We can put you in touch with one of our experienced weight loss clinicians so you can be sure you’re making the best decision with the most accurate information.
To get in touch, contact our Customer Service team on 0800 978 8956 or email [email protected].
Review By
HARMINDER ‘HARMY’ KAUR
Last Updated On : Mar 13 2026
BSc(hons) Pharmacy
GPhC Number: 2061107
Authored By
GURDEV SEHMI
Last Reviewed On : Mar 23 2026
BSc Pharm, MRPharmS, Independent Prescriber, Superintendent Pharmacist, Clinical Lead
GPhC Number: 2050925
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