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Mounjaro
Mounjaro
Mounjaro is a prescription-only weight loss injection that contains the active ingredient tirzepatide.
- Once a week self-injection pen which reduces appetite, makes you feel fuller and supports you in losing up to 22.5%* of your starting weight
- Achieve your weight loss goals for less from £176.00
- Earn 5x Health and Beautycard points
In stock
from £176.00
Product details
Mounjaro is a weekly weight loss injection that contains the active ingredient tirzepatide. Tirzepatide works by activating two receptors (GLP-1 and GIP) to increase the level of hormones in the body, helping you to feel fuller for longer after a meal.
Mounjaro should be taken just once a week alongside a healthy diet and exercise. It has been proven to help people lose around 22.5%* of their initial body weight by week 72 of treatment, at a maximum dose of 15 mg.
To be eligible for Mounjaro for weight loss, you must have a body mass index (BMI) of 30 kg/m2 or more (obese), or of at least 27 kg/m2 (overweight) and have a risk factor or a health condition that is affected by weight.
Benefits of Superdrug Online Doctor
Expert support throughout your journey
Ongoing support from GMC registered doctors (GPs)
Message your doctor via your patient account
Pharmacist support in >175 pharmacies
Next day collection at your local Superdrug pharmacy
Perks beyond the scale
5x Health & Beautycard points to spend in store and online
40% off selected gyms nationwide
Guidance on food, movement and lifestyle
Weight loss support pack
Nutritionist developed tools
Tracking sheets, diaries and resource guides
Insights into long-term healthy habit building
Weight Loss Consultation Prices
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£30 off for new patients with code: WLNP30. Earn Health&Beautycard points on all approved treatment requests |
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| Dose | Standard Price | New Patient Price | Value of H&B Points |
|---|---|---|---|
|
2.5mg Starting dose Weeks 1-4 |
£176.00 |
£146.00 |
£7.30 |
|
5mg Step up dose Weeks 5-8 |
£189.00 |
£159.00 |
£7.95 |
|
7.5mg Step up dose Weeks 9-12 |
£267.00 |
£237.00 |
£11.85 |
|
10mg Step up dose Weeks 13-16 |
£302.00 |
£272.00 |
£13.60 |
|
12.5mg Step up dose Weeks 17-20 |
£314.00 |
£284.00 |
£14.20 |
|
15mg Maintenance dose Weeks 21+ |
£334.00 |
£304.00 |
£15.20 |
Lost the Weight and Ready to Keep it Off?
If you've achieved your weight loss goals and want support to keep the weight off, we can continue providing treatment.
Delivery Options
With our weight loss service you'll get:
- Secure delivery to your preferred address
- Needles and sharps bin
- Weight loss support guide
- Weight loss tracker and food diary
- Home delivery or collection from any of our nationwide pharmacies*
- Doctor messaging for advice and support
- Fast and easy repeat prescriptions
- Earn 5x Health & Beautycard points to redeem on Superdrug.com or in-store
*Please contact the pharmacy prior to collection if you have not received confirmation that your order is ready to collect.
Please check for your needles carefully as they come packaged OUTSIDE your Mounjaro box
How it works
A doctor prescribes treatment if appropriate
One of our doctors reviews your answers and pictures, and approves treatment or recommends the most suitable option for your health and needs.
Pick up in store or delivered to your door
Start your weight loss journey with your treatments delivered in plain, unmarked packaging! You can also collect from your local Superdrug pharmacy.
About Mounjaro
What is Mounjaro?
Mounjaro is a prescription-only weight loss injection that contains the active ingredient, tirzepatide. It works by activating glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) receptors to regulate your appetite, helping you feel fuller for longer, and making you feel less hungry, making it easier to lose weight.
Mounjaro is injected once a week under the skin of the thigh, abdomen, or upper arm. When you start Mounjaro, your doctor will prescribe a low starting dose (2.5mg), which will be gradually increased every 4 weeks until you reach the maintenance dose that’s most suitable for you.
How does Mounjaro work for weight loss?
Mounjaro contains the active ingredient, tirzepatide, which works to activate the receptors of 2 hormones released by your gut after eating, which are called GLP-1 and GIP.
Mounjaro mimics the effects of GLP-1 and GIP by acting on the areas of the brain that control hunger, promoting weight loss by:
- reducing food intake
- making you feel fuller for longer
- delaying the time it takes food to pass through your stomach
Mounjaro’s ability to regulate your appetite and blood glucose levels makes it an effective weight loss medication because it can:
- make it easier for you to reduce your calorie intake
- reduce food cravings
- limit blood sugar spikes
How long does Mounjaro take to work?
Mounjaro starts to work within a few hours of your first injection, however, it can take a few weeks for you to start fully noticing its effects. Your Mounjaro dosage will be increased slowly over a number of weeks to reduce the risk of side effects.
If you have not lost at least 5% of your starting body weight after 6 months, your doctor will probably advise you to stop using Mounjaro, as it’s unlikely to be an effective weight loss medication for you.
How much weight will I lose on Mounjaro?
Clinical trials have shown that Mounjaro helps people lose up to 22.5%* of their initial body weight in 72 weeks when they use the highest maintenance dose of 15mg per week.
Mounjaro works best for weight loss when it is taken alongside healthy lifestyle changes such as a healthy, balanced diet and regular exercise.
How long do I need to take Mounjaro?
Mounjaro is intended for long-term use. However, if you are unable to lose at least 5% of your starting weight loss within 6 months of titrating (gradually increasing your dose) to the maximum dose, your doctor may advise you to stop using it or try a different weight loss treatment.
What happens when I stop taking Mounjaro?
You must not stop taking Mounjaro without talking to your doctor first.
When you stop taking Mounjaro, the effects of the medication will wear off, and you might notice that you are getting your appetite back. This can sometimes lead to weight gain. So, your doctor may recommend that you reduce your dose slowly. You can help to avoid putting weight back on by sticking to your healthy diet and exercise plan.
Who is eligible for Mounjaro?
To take Mounjaro, you need to meet certain eligibility criteria. This is for doctors to gauge whether the treatment is necessary, safe, and suitable for you.
You can request Mounjaro from Superdrug Online Doctor if you have:
- a BMI of 30kg/m2 or more (obese)
- a BMI of 27kg/m2 or more (overweight) and a weight-related health issue such as high blood pressure
If you’re not sure what your BMI is, you can use our free BMI calculator.
Mounjaro can also be used to treat type 2 diabetes in adults when the condition is not well controlled. It can be used on its own or in combination with other diabetes medications.
How to use Mounjaro injection pen
To inject Mounjaro safely, you should always follow the package leaflet instructions and guidance from your doctor to ensure you have a correct injection technique.
Prepare your pen:
- Wash your hands thoroughly with soap and warm water.
- Remove the pen cap and check the medication has not expired, is not damaged, and the solution is clear to slightly yellow in appearance.
- Wipe the red inner seal with a swab.
- Select a new pen needle and attach it to the pen.
- Remove the outer needle shield and place it to one side.
- Pull off the inner needle shield and throw it away.
- Slowly turn the dose knob until you hear 2 clicks and the extended line is shown in the dose window.
- Hold your pen with the needle pointing up and tap the cartridge holder gently to collect any air bubbles at the top.
- Prime the pen by releasing air bubbles.
If, after you have primed your pen, you do not see any medicine, you should repeat steps 7 to 9 no more than 2 more times.
If you still don’t see any medicine, you should contact your local pharmacy or doctor for advice.
Mounjaro injection sites
Mounjaro can be injected into your:
- thigh
- abdomen
- upper arm
Injecting Mounjaro:
- Choose your injection site.
- Turn the dose knob until it stops and the -1 icon is visible in the dose window.
- Insert the needle into your skin. Inject the medication by pushing the dose knob in until it stops, then slowly count to 5 while holding the dose knob. Make sure the -0 icon is visible in the dose window before removing the needle from your skin.
- Remove the needle from your skin. Confirm the -0 icon is in the dose window. If it is not, you have not received the full dose. You will need to insert the needle back into your skin and finish the injection, but do not redial the dose.
After you have injected Mounjaro:
- If you see blood coming from where you injected, this is normal. Simply press the site with gauze or a cotton wool ball, do not rub it. Use a plaster if necessary.
- Replace the outer needle shield, unscrew the capped needle and dispose of it in your sharps container.
- Replace the pen cap.
Injecting Mounjaro summary:
- It is best and recommended to inject Mounjaro in your abdomen or upper legs.
- Rotate your injection site weekly to avoid bruising or reactions.
- Leave one finger's width between previous injection sites. If you are injecting into the abdomen, stay 5cm away from the navel.
Is a red bump or liquid on my skin normal after injecting?
Injection site reactions are common when injecting Mounjaro. You may experience bruising, swelling, red bumps, or itching. These tend to go down over time, especially as your body gets used to Mounjaro. We recommend rotating the injection site each week to prevent irritation. If you are concerned about Mounjaro site reactions, speak with your doctor.
Mounjaro doses
Mounjaro is available in 6 different doses:
- 2.5mg
- 5mg
- 7.5mg
- 10mg
- 12.5mg
- 15mg
When you begin your treatment with Mounjaro, you’ll start on the starting dose of 2.5mg per week for 4 weeks. If the medication works well for you, you can increase to 5mg per week for 4 weeks.
Depending on how your body reacts to Mounjaro or your weight loss journey, you can choose to stick to this dose or increase by 2.5mg every 4 weeks. The maximum maintenance dose for Mounjaro is 15mg per week. The Mounjaro dosage schedule is also shown in this image:
What should I do if I miss a dose of Mounjaro?
If you forget to inject Mounjaro and it has been:
- 4 days or less since you last injected Mounjaro, use it as soon as you remember, then inject your next dose as usual
- more than 4 days since you last used Mounjaro, skip the missed dose and inject your next scheduled dose as usual
Do not inject a double dose to make up for a missed or forgotten dose. You must leave at least 3 days between injecting doses.
When do I need to increase the dose of Mounjaro?
You must speak to your doctor if you think you need to increase your dose of Mounjaro. You may need to increase your Mounjaro dose if you:
- have not yet reached the maximum maintenance dose
- feel it is not as effective as it was before, signs of this include an increased appetite, a weight loss plateau, and fewer side effects
Mounjaro doses are titrated (increased) every 4 weeks unless you are on the maximum maintenance dose (15mg) or you have started at a lower maintenance dose (5 or 10mg).
Can I take my Mounjaro dose a day early?
You can take your Mounjaro dose early only if you’re looking to change your weekly injection day, so long as it has been at least 3 days since your last one. This means you will change when you take your next dose to exactly a week later.
You should not take Mounjaro a day early if you’re not planning to change your weekly dose day, as this means you’ll be taking Mounjaro more than once a week. This could cause more severe side effects and could be unsafe.
Can I switch from Mounjaro to Wegovy?
Yes, if you meet the eligibility criteria for Wegovy. You can place a treatment request and our doctors will review it.
Your first dose of Wegovy can be taken 7 days after your last dose of Mounjaro. Our doctors will prescribe the right starting dose for you based on the dose of Mounjaro you’re currently taking. This usually means switching to a slightly lower dose of Wegovy to keep the transition safe and minimise side effects.
Switching with Superdrug Online Doctor is simple. Just fill out a health questionnaire and place an order for the dose of Wegovy you are eligible for and our doctors will ensure it's right for you and guide you as you start your new medication.
Use this table as a quick reference to see how your current Mounjaro dose aligns with Wegovy:
| Mounjaro | Wegovy |
|---|---|
| 2.5mg | 0.25mg |
| 5mg | 0.5mg |
| 7.5mg | 0.5mg |
| 10mg | 1mg |
| 12.5mg | 1mg |
| 15mg | 1mg |
Please note: this table is a guide, your doctor will confirm your final dose before prescribing.
If this is your first time requesting treatment from Online Doctor, all you need to do is fill out a health questionnaire for Wegovy and our doctors will review your eligibility and health history to ensure the treatment is suitable for you.
If you’re switching to liraglutide (daily injections), your first dose can also be taken 7 days after your last weekly injection. Dose escalation will follow the standard schedule.
Most people currently taking Mounjaro will be eligible for Wegovy, but our doctors will always check carefully before prescribing.
For more guidance on switching to Wegovy, take a look at our article.
Where can I buy Mounjaro in the UK?
You will need a prescription from a doctor before you can obtain Mounjaro. You can also request a private prescription from a reputable online service like Superdrug Online Doctor.
Can I buy Mounjaro online?
Yes, you can request Mounjaro from Superdrug Online Doctor using our quick and discreet service:
- complete an online health questionnaire
- one of our doctors will review your request to see if your chosen medication is right for you
- if approved, you can choose to have your medication sent by post or collect it from a Superdrug Pharmacy the following working day after approval
By ordering Mounjaro from us, you can beat the NHS waiting list, as there is no need to wait for an appointment, meaning you could start your Mounjaro treatment in as little as the next working day.
Can I buy Mounjaro over the counter?
No, Mounjaro cannot be bought over the counter because it is a prescription-only medication. So, you will need a prescription from a licensed healthcare professional to get it.
If you’re looking for an over-the-counter weight loss medication, alli, a type of weight loss pill, may be more suitable for you.
Can I get Mounjaro on the NHS?
Yes, Mounjaro is now available on the NHS to patients who meet very strict criteria.
To be eligible for Mounjaro via your GP, you will need to have a BMI of more than 40, or 37.5 if you are from an ethnic minority background. In addition to this, you should have at least 4 weight-related health conditions, such as:
- high blood pressure
- high levels of fat in your blood
- obstructive sleep apnoea
- cardiovascular disease
- type 2 diabetes
Can you buy generic Mounjaro?
No, generic Mounjaro or tirzepatide is not currently available. It could be a while before a generic version comes onto the market because Mounjaro is still protected under patents by its manufacturer, Eli Lilly and Co.
Side effects of Mounjaro
Like all medications, Mounjaro is associated with causing some side effects, however not everyone will get them.
Very common side effects include:
- diarrhoea
- feeling sick (nausea)
- being sick (vomiting)
- constipation
- low blood sugar (if taken alongside certain diabetes medications)
- stomach pain
Common Mounjaro side effects are:
- fast pulse
- mild to moderate allergic reaction, such as eczema, itching, or rash
- constipation
- indigestion
- bloating
- gas and burping
- heartburn or reflux
- fatigue
- an increase in the levels of pancreatic enzymes, which will show up on a blood test
- itching, redness, or irritation at the injection site
- low blood pressure
- dizziness
- hair loss
Uncommon side effects include:
- gallstones
- an increase in calcitonin (a hormone that helps to control calcium levels)
- weight loss
- injection site pain
- an inflamed pancreas (acute pancreatitis) – speak to your doctor straight away if you notice severe stomach and/or lower back pain that isn’t going away
- low blood sugar (when using Mounjaro alongside metformin)
- taste changes
You can find a full, in-depth list of potential Mounjaro side effects in the patient information leaflet supplied with your medication.
How long do Mounjaro side effects last?
How long Mounjaro side effects last differs from person to person, but mild side effects are likely to go away within a few days to a week as your body adjusts to the medication.
Mounjaro side effects are more likely when you first start using Mounjaro or when you increase the dose because your body needs time to get used to the medication.
What to do if you get Mounjaro side effects
Mild side effects can usually be managed at home by getting lots of rest, eating smaller meals, drinking plenty of fluids, and taking over-the-counter painkillers if necessary.
If you experience more severe or serious side effects such as an allergic reaction or severe stomach pain, you should get medical attention straight away.
If you experience any of the following, call 999 or get someone to take you to your nearest A&E department:
- breathing or swallowing difficulties
- swelling in your face, throat, and mouth
- fainting or loss of consciousness
- intense stomach pain
Mounjaro warnings
Mounjaro may not be suitable for everyone.
Do not use Mounjaro if you are allergic to any of its ingredients, including tirzepatide.
Before using Mounjaro, tell your doctor if you:
- have severe problems with digestion or food remaining in your stomach for longer than normal
- have ever had pancreatitis
- have an eye problem
- are using a sulphonylurea or insulin to control your diabetes
- are taking any other prescribed, over-the-counter, or herbal medications
Mounjaro and pregnancy
Mounjaro should not be used if you are pregnant, as its effect on unborn children is unknown.
If you are pregnant, think you might be, or are planning to get pregnant, speak to your doctor before using Mounjaro. It is recommended that you use contraception while using Mounjaro. However, if you are using oral contraception, you should consider using a barrier method like condoms as well or switch to a non-oral contraceptive method for 4 weeks after starting Mounjaro and then for 4 weeks after each dose increase.
Mounjaro and breastfeeding
If you are breastfeeding or planning to breastfeed, you should speak to your doctor before using Mounjaro because it isn’t known whether the active ingredient in tirzepatide passes into your breast milk.
Mounjaro and the contraceptive pill
If you are using contraceptives such as the oral contraceptive pill, you should consider using a condom or other types of non-oral contraceptives for a month (4 weeks) after you start injecting Mounjaro. You should also do this again for 4 weeks each time you increase your dose.
Mounjaro and the morning after pill
If you have had unprotected sex and are taking Mounjaro, you should consider using the copper intrauterine device (IUD) as your preferred method of emergency contraception. That’s because Mounjaro can slow down stomach emptying, potentially affecting the absorption and effectiveness of levonorgestrel, a synthetic form of progesterone, which is used in several morning after pills. This is most likely in the first 4 weeks of starting Mounjaro and 4 weeks after each dose increase. It’s not known if Mounjaro reduces the effectiveness of ellaOne. We recommend the copper coil contraceptive if you are taking Mounjaro as it is effective and you can be assured it is less likely to be affected by weight loss treatments like Mounjaro.
Alternative weight loss medications
Mounjaro is not the only weight loss medication available. There are several other options, consisting of injections and pills.
Weight loss injections
As well as Mounjaro, we offer the following weight loss injections at Superdrug Online Doctor:
Wegovy
Like Mounjaro, Wegovy is a once-weekly weight loss injection, except it contains the active ingredient semaglutide. It mimics the effects of the hormone GLP-1, helping to slow the movement of food through your digestive system so that you feel fuller for longer and resist overeating. Wegovy can help you lose up to 21% of your starting body weight within 72 weeks of starting treatment. on the highest maintenance dose 7.2mg.
What is the difference between Mounjaro and Wegovy?
Mounjaro contains tirzepatide and is a GLP-1 and GIP receptor agonist, whereas Wegovy contains semaglutide and only activates the GLP-1 receptors in the brain. So, although they are both examples of weight loss injections that are injected once per week, they have different ingredients.
Liraglutide
Liraglutide is the generic version of the weight loss injection Saxenda, which is no longer available. Liraglutide is the active ingredient in the medication and is injected once daily. It has been shown that liraglutide can help you lose an average of 8% of your body weight after 56 weeks at the maintenance dose.
Weight loss pills
Weight loss injections may not be suitable for everyone, but at Superdrug Online Doctor, we also offer the following weight loss pills:
Orlistat
A generic form of Xenical, both pills contain orlistat in the same dosage and work in exactly the same way. They work by binding to the enzyme responsible for breaking down the fat you eat, called lipase, to stop around ⅓ of the fat in your meal from being absorbed. The excess is then passed out of the body as stool waste. These pills can be taken up to 3 times a day with a meal that contains dietary fat.
Mysimba
Mysimba is a weight loss pill that contains the active ingredients naltrexone and bupropion that act on the area of the brain responsible for controlling your appetite to make you feel less hungry.
alli
An over-the-counter version of orlistat that you can buy without a prescription. alli is available in a lower dose (60mg) than the prescription-only orlistat, but it works in the same way to stop your body absorbing all the fat in your meals.
What is the difference between Mounjaro and Ozempic?
Ozempic is only licensed for the treatment of type 2 diabetes, whereas Mounjaro is a weight loss medication and can be used to control blood sugar levels.
The 2 medications contain different active ingredients. Mounjaro contains tirzepatide, whereas Ozempic contains semaglutide, the same active ingredient as Wegovy. Mounjaro is a GLP-1 and GIP receptor agonist, whereas Ozempic only acts on GLP-1 receptors.
Looking after your Mounjaro pens
How to store Mounjaro
You must store your Mounjaro pens and needles out of the reach and sight of children.
You should store unopened Mounjaro pens in the fridge at 2 to 8°C, but they must not be frozen.
You should keep Mounjaro pens in their original packaging to protect them from light.
Once opened, you can store your Mounjaro pen out of the fridge for up to 30 days, but it should not sit in temperatures over 30°C.
How long can Mounjaro be left unrefrigerated for?
You can store opened Mounjaro pens out of the fridge for up to 30 days as long as the temperature does not exceed 30°C.
What should I do with Mounjaro pens when they are finished?
Remove the needle from each pen, then discard the needle in your sharps container. Finally, dispose of the empty pen in your sharps container or household waste.
What should I do if Mounjaro has been stored incorrectly?
Do not use your pen if it has:
- frozen
- been stored in conditions above 30°C for longer than 30 days
- been exposed to direct sunlight or high heat
Here are some common mistakes made when storing Mounjaro and what to do:
| Situation | What to do: |
|---|---|
| Left unrefrigerated and unopened | It’s okay to use it if it has been less than 30 days since receiving the dosage. If you open it, it must be refrigerated. |
| Left out at room temperature |
Under 30 days – You can use the pen, just return it to the refrigerator or continue storing it at room temperature within the 21-day window.
Over 30 days – Discard it and contact your prescribing doctor. |
| Accidentally frozen | Do not use. The medication is now damaged and will not be effective. Contact your prescribing doctor. |
| Exposed to high temperatures | If exposed only briefly, for example, a couple of hours, this should be fine, but also may be unusable. Contact your prescribing doctor for advice. |
How to store Mounjaro pens while travelling
When travelling with Mounjaro, it is best to keep it in a cool bag or next to an ice pack. If you are staying in a hotel, make sure to check ahead to request a refrigerator to keep it in.
If you need to take additional doses with you that are unopened, it is safe to leave them unrefrigerated for 30 days since you received them, but if they are exposed to high heat or very cool temperatures, they may become unsafe and ineffective to use. Always check with your prescribing doctor, and they will advise you on the best way to store your Mounjaro medication based on your situation and travel plans.
When travelling with Mounjaro, remember to keep it in its original packaging and carry the patient information leaflet with you. We recommend getting a doctor’s note if you will be travelling through airport security. Alternatively, if you usually get Mounjaro with Superdrug Online Doctor, you’ll automatically get a free, downloadable GP letter after your order is approved, which you can use for travelling.
Mounjaro FAQs
Is Mounjaro safe?
Yes, Mounjaro is considered a safe weight loss medication and has been approved for weight loss in the UK since 2023. Like all medications, Mounjaro can cause side effects, so it is important to read the patient information leaflet before using Mounjaro. If you are concerned about the safety or side effects of Mounjaro, speak to your doctor for further advice.
Is Mounjaro addictive?
Mounjaro is not currently known to be addictive. If you are concerned about whether Mounjaro is addictive you should speak to your doctor before using it for weight loss.
Can I take Mounjaro long-term?
Mounjaro is intended for long-term use, but if you are unable to lose at least 5% of your starting weight loss within 6 months of titrating (gradually increasing your dose) to the maximum dose, your doctor may advise you to stop using it or try a different weight loss treatment.
Why am I still hungry on Mounjaro?
If you find you are feeling hungry or that your appetite has returned while using Mounjaro, it may be that the current dose is no longer suppressing your appetite. Speak to your doctor to see if it is possible to increase your dose.
Can I drink alcohol while using Mounjaro?
Although there is no evidence that Mounjaro interacts dangerously with alcohol, it is advisable to limit or stop drinking alcohol. Alcohol can affect your blood glucose levels and increase your calorie intake which may make it more difficult for you to lose weight.
Should I take Mounjaro with food?
Mounjaro can be taken with or without food. There is no evidence that food affects how Mounjaro works or its effectiveness. What is important when taking Mounjaro is that you take it on the same day each week and around the same time.
How long will it take to lose weight on Mounjaro?
Clinical research shows that people who use Mounjaro for weight loss can lose up to 22.5% of their starting body weight after 72 weeks when taking the maximum maintenance dose of 15mg per week. However, this is an average and your weight loss results may be different to these.
Does Mounjaro burn fat?
No, Mounjaro doesn’t burn fat. Instead, it regulates your appetite and suppresses food cravings to stop you overeating. It also slows the time it takes for food to pass through your stomach, making you feel fuller for longer. It works best alongside a calorie-controlled healthy diet and regular exercise.
How do I dispose of Mounjaro?
After you have removed the needle, you should dispose of it in a sharps container. You’ll need to do this after each injection because you will use a new needle for each dose.
Once you have finished with the pen after 4 weeks, you can discard the empty pen in a sharps container or in your household waste.
How should I store Mounjaro?
You must store your Mounjaro pens and needles out of the reach and sight of children.
You should store unopened Mounjaro pens in the fridge at 2 to 8 degrees Celsius but they must not be frozen.
You should keep Mounjaro pens in their original packaging to protect them from light.
Once opened, you can store your Mounjaro pen out of the fridge for up to 30 days, but it should not sit in temperatures over 30 degrees Celsius.
How long can Mounjaro be unrefrigerated for?
You can store opened Mounjaro pens out of the fridge for up to 30 days as long as the temperature does not exceed 30 degrees Celsius.
What happens if I stop taking Mounjaro?
You must not stop taking Mounjaro without talking to your doctor first.
When you stop taking Mounjaro, the effects of the medication will wear off and you’ll notice that you’ll start to get your appetite back. This can lead to weight gain. So, your doctor may recommend that you reduce your dose slowly. You can help to avoid putting weight back on by sticking to your healthy diet and exercise plan.
Medically reviewed by
Dr Clair GraingerLast reviewed: 12 Feb 2026
With Superdrug Online Doctor you can message our Doctors for FREE via your patient account.
Sources
- How Mounjaro works, Lilly [accessed 14 August 2025]
- How to dispose of Mounjaro® (tirzepatide) KwikPens® and needles, Lilly [accessed 14 August 2025]
- Mounjaro KwikPen 10mg solution for injection in pre-filled pen SmPC, emc [accessed 14 August 2025]
- Saxenda 6 mg/mL solution for injection in pre-filled pen SmPC, emc [accessed 14 August 2025]
- Treatment: Obesity, NHS [accessed 14 August 2025]
- Wegovy 0.25 mg, FlexTouch solution for injection in pre-filled pen SmPC, emc [accessed 14 August 2025]
- Weight management and tirzepatide (Mounjaro) for patients and public [[accessed 14 August 2025]
- FSRH Statement: Ulipristal Acetate and Breastfeeding, The College of Sexual and Reproductive Healthcare [accessed 16 December 2025]
Related Weight Loss Treatments
Further Reading on Mounjaro
Clinical study references
*With a reduced calorie diet and increased physical exercise. People respond to medicines differently, so there is no set time for when you can expect to see results. Ask your healthcare professional about what might be a realistic expectation for you.
Source: (1) Tirzepatide Once Weekly for the Treatment of Obesity, The New England Journal of Medicine homepage [accessed 30 December 2024]
(2) MHRA authorises diabetes drug Mounjaro (tirzepatide) for weight management and weight loss, GOVUK [accessed 30 December 2024]