Considered one of the most effective weight loss injections, Mounjaro pens contain a dual-action ingredient that can lead to a significant drop in body weight after 72 weeks
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Mounjaro is the brand name for tirzepatide, a medicine developed by Eli Lilly. It’s part of a new generation of treatments that target hormones involved in appetite and glucose regulation. Initially licensed for type 2 diabetes, Mounjaro has also been found to be highly effective for weight management, helping people lose a greater percentage of their body weight than any previously approved medication. It comes as a pre-filled injection pen, used once a week at home.
For maximum efficacy, Mounjaro weight loss injections should be taken in conjunction with a healthy, calorie-controlled diet and regular exercise. They are intended to be a long-term solution to obesity that promotes better lifestyle choices.
Weight Loss Journey is proud to offer Mounjaro injections at the following prices as part of our consultation service.
You can buy Mounjaro in the UK on prescription after a consultation with a private prescriber or a specialist weight loss service. Using an online provider such as Weight Loss Journey is the most efficient way to do this, as there is no need for face-to-face appointments or potentially lengthy waiting times.
With us, you can complete our online consultation from the comfort of your home at a time that's convenient for you. Our experienced clinicians will also be available throughout your journey to offer advice and support when needed.

Consultation
Provide some medical-based information, including details of any other treatments you may be taking.
Assessment
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Mounjaro (tirzepatide) is a prescription-only weight loss injection designed to facilitate weight management for individuals who have struggled with diet and exercise alone. Multiple clinical trials have concluded that Mounjaro injections are safe and suitable for long-term use as part of a healthy lifestyle.
What makes Mounjaro unique is the fact that it mimics two naturally occurring hormones. This contrasts with two other popular weight loss injections (namely Wegovy and Nevolat), which only imitate one. The treatment is administered once weekly under the skin of the upper arm, abdomen, or thigh.

Mounjaro works by activating two hormone receptors in the body: GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide). These hormones are known as incretins and are naturally released by your gut after eating.
The main functions include helping regulate blood sugar, slowing digestion, and signalling to your brain that you’re full. Tirzepatide enhances these natural processes so you feel satisfied after smaller meals and reduces cravings.
In simple terms:

The results from clinical trials of Mounjaro (tirzepatide) have been highly encouraging. In the landmark Phase 3, double-blind SURMOUNT-1 trial, researchers studied over 2,500 adults with obesity but without diabetes for 72 weeks. Participants received once-weekly doses of tirzepatide ranging from 5 mg to 15 mg, alongside lifestyle advice. The dose escalation period lasted 20 weeks.
According to the study, average weight loss ranged from 16% with the 5mg dose to 22.5% with the highest 15mg dose, with more than 90% of participants losing at least 5% of their body weight. Over half of users lost 20% or more, a result rarely seen with medication alone. Meanwhile, participants also experienced significant improvements in cholesterol, blood pressure and waist circumference. These are all key indicators of heart and metabolic health.
To put these figures into perspective, other leading treatments such as Wegovy (semaglutide) produce an average weight loss of around 15%, while Mounjaro achieved up to 22.5% in this study. How much weight you could lose depends on many factors, such as your lifestyle choices and how your body responds to the treatment.
Mounjaro weight loss injections typically start working within a few hours of your first treatment. It may take several weeks for you to fully notice its impact on satiety and appetite suppression. In the meantime, it’s essential to start building a sustainable, healthy routine you can follow throughout your journey.
Mounjaro is intended for use as part of a long-term weight management strategy. Regular check-ins are required to ensure the medication is still having the desired effect and that you continue to notice the benefits. If you haven’t lost at least 5% of your body weight within the first 6 months, Mounjaro may not be suitable for you.
The SURMOUNT-1 Trial showed a 22.5% weight loss after 72 weeks of Mounjaro use
This calculator is provided for illustrative purposes only, and the results are not guaranteed. Everyone’s weight loss journey is unique.
A Solid Start
One study reported that the mean weight loss after 3 months was 5.9% with Mounjaro, compared with 3.6% with semaglutide (Wegovy).
Steady Progress
After 28 weeks of taking Mounjaro injections, you could lose around 11 kgin weight. This should primarily be driven by a reduction in fat mass.
Long-Term Impact
The SURMOUNT-4 clinical trial noted that over half (54.5%) of Mounjaro users lost at least 25%of their starting body weight after 88 weeks.
Mounjaro can only be prescribed via prescription after a clinical assessment. It’s suitable for adults with obesity (BMI ≥30) or those overweight (BMI ≥27) who have weight-related health issues such as high blood pressure, high cholesterol, pre-diabetes or sleep apnoea.
Our clinicians will review your medical history and circumstances to determine whether the treatment is right for you.
Mounjaro Kwikpens are pre-filled injection pens that are used once a week. Each pen delivers a single, measured dose under the skin. To use Mounjaro, first choose your injection site; usually your abdomen, thigh, or upper arm. Clean the area with an alcohol wipe and press the pen against your skin before injecting the dose.
To avoid the risk of irritation, it’s a good idea to rotate your injection site each week. For consistency and optimal results, you should administer your Mounjaro dose on the same day each week.
The typical starting dose is 2.5 mg once weekly, increased gradually every 4 weeks to help reduce side effects. Possible maintenance doses include 5 mg, 10 mg and 15 mg, depending on response and tolerance.
Do not adjust your dose without discussing it beforehand with a healthcare professional.

If you miss a dose of Mounjaro, you can take it as soon as you remember, provided it has been fewer than 4 days since your missed dose. If more than 4 days have passed, skip the missed dose and administer the next on your regular day. Do not try to double-dose Mounjaro.
The main reason you have to increase your Mounjaro dose is that the higher strengths are most effective for weight loss. A slow titration schedule is necessary so that your body can safely adjust to the high doses and keep side effects to a minimum
Mounjaro injections are usually well tolerated; however, they can cause side effects. They’re usually mild in nature, while some people may not experience anything at all. Some potential Mounjaro side effects include:
Nausea
Diarrhoea
Vomiting
Constipation
Bloating
Injection site reactions
Heartburn
Fatigue
Low blood sugar
Flatulence
Delay in stomach emptying
Change in skin sensation
Change in sense of taste
Gallbladder infection
Inflamed pancreas
Severe abdominal pain
Please note that this is not a complete list of Mounjaro side effects. For more information, please review the Patient Information Leaflet. If you experience serious side effects, stop using the treatment and seek medical assistance.
The side effects of Mounjaro usually taper off after a few days or weeks of starting treatment. They typically occur at the beginning of your journey and during dose escalation. Many people who reach the highest Mounjaro dose notice their symptoms disappear completely over time
To minimise the impact of Mounjaro side effects, try eating smaller, more frequent meals and avoiding high-fat, spicy, or hard-to-digest foods. Hydration is also important, so stick to water as much as possible and limit your intake of alcohol and sugary drinks.
If you’re unsure about where to buy Mounjaro in the UK, Weight Loss Journey is here to help
Yes, you can order Mounjaro online from reputable providers such as Weight Loss Journey. Simply complete our brief medical questionnaire, and our clinicians will determine whether Mounjaro injections are suitable for your lifestyle and circumstances
No, you cannot buy Mounjaro over the counter in the UK. Mounjaro is classified as a prescription-only medication (POM), meaning you need the approval of a licensed prescriber (such as a clinician or doctor) before obtaining the treatment.
Yes, you can get Mounjaro on the NHS. However, availability is extremely limited and subject to stricter eligibility criteria than if you source the medication privately. This, coupled with increased convenience, is why many people choose to buy Mounjaro online.
Yes, Mounjaro is safe and effective for weight loss when used exactly as prescribed under the supervision of a licensed medical professional. The medication will have undergone rigorous testing before being approved in the UK. Indeed, the National Institute for Health and Care Excellence (NICE) recommends tirzepatide for the management of obesity for certain patients.
Although Mounjaro is safe for weight loss, it is not suitable for everyone. If you’re unsure about taking tirzepatide, consult a healthcare professional who can help you determine the best option for you.
Mounjaro isn’t suitable for everyone. It should not be used by certain people, such as those with:
Type 1 diabetes
A history of pancreatitis
Certain rare conditions, such as medullary thyroid cancer or MEN2 syndrome
Always let your doctor know about your full medical history and any other medications before starting Mounjaro.
No. Mounjaro should not be used during pregnancy, as there isn’t enough research to confirm its safety for developing babies. If you’re planning to get pregnant, you’ll need to stop Mounjaro at least one month before trying to conceive to allow the medicine to fully clear from your system.
Speak to your doctor about alternatives for managing your weight or diabetes during pregnancy.
Mounjaro may temporarily affect how well oral contraceptive pills are absorbed into your body, especially when you first start or increase the dose. This happens because Mounjaro can slow stomach emptying, reducing the rate at which the tablets are absorbed.
If you’re using Mounjaro Kwikpens and also taking oral contraceptive pills, it’s recommended to use a barrier method (such as condoms) or switch to a non-oral form of contraception for 4 weeks after starting Mounjaro and 4 weeks after each dose increase.
You don’t need to follow a strict diet on Mounjaro, but avoiding certain foods can help reduce nausea and digestive side effects. Try to limit greasy or spicy foods, as well as heavy meals. Eating slowly, choosing smaller portions and focusing on lean proteins, fruits and vegetables can make treatment easier on your stomach and support steady weight loss.
If you stop taking Mounjaro, you may notice that your appetite and food cravings return, since tirzepatide will no longer suppress them. Weight gain is also a possibility, with one clinical trial finding that patients who discontinued the treatment after 36 weeks regained 14% of the weight they had previously lost on the medication.
To reduce the likelihood of this occurring, it’s essential to maintain your healthy lifestyle choices, such as a balanced, calorie-controlled diet and regular exercise. Slipping back into old habits could lead you to lose much of the progress you've made with Mounjaro.
There are several potential reasons why you’re not losing weight on Mounjaro. These include not administering the medication correctly, not being on the right dose, having an underlying medical condition, poor sleep and stress management, or that other treatments are having an adverse effect. You may also not have fully committed to the necessary lifestyle choices to achieve success.
Although Mounjaro injections are extremely effective for weight loss, they are not suitable for everyone. If you think that the treatment may not be right for you, it’s essential to consult a clinician for guidance.
You should store unused Mounjaro Kwikpens in the refrigerator at 2ºC to 8ºC, away from direct sunlight. After the first use, you can store the pens at room temperature (under 30ºC) for up to 30 days. However, it’s recommended to keep the Kwikpens in the refrigerator wherever possible. Don’t freeze the medication, and avoid storing it near the freezer compartment.
Never store Mounjaro Kwikpens with the needle attached, as this could cause air to enter the pen or lead to a leak. You should also keep the pen cap in place. It’s important to throw away the pen after 30 days from its first use, even if the medication is still in it. Always store treatments out of the sight and reach of children and animals, and never take them after the expiry date.
Unused Mounjaro Kwikpens can last in the fridge until the expiry date. This can be for up to 24 months from the manufacturing date. Once opened, the pens must be discarded after 30 days or after the fourth dose has been administered, whichever comes first. In all cases, Mounjaro should be stored between 2ºC and 8ºC and never frozen.
It’s recommended that you never store Mounjaro Kwikpens in the fridge door, as this is where temperatures fluctuate the most. You should also avoid keeping them close to the freezer compartment, since this may cause the medication to freeze.
Mounjaro Kwikpens can be left out of the fridge for up to 30 days, provided the temperature doesn’t exceed 30ºC. Leaving them out for longer could cause the active ingredient to break down and lose its effectiveness. If you have not used your Mounjaro pen yet, it is recommended to keep it refrigerated at all times.
If you usually store your opened Mounjaro Kwikpens in the fridge but forget to do so, it’s perfectly safe to return them to the fridge when you remember. This is provided the outside temperature has not exceeded 30ºC. According to the manufacturer, there is evidence that cycling Mounjaro pens between refrigerated and room-temperature conditions does not affect the product’s quality over the 30-day usage period.
Yes, you can take Mounjaro on a plane as it’s a licensed medication. It’s recommended to store your Mounjaro Kwikpens in your hand luggage and not in the hold, as this could leave the medication vulnerable to sudden temperature changes. You should be fine to pass through airport security without difficulty if you declare your injection pens and supplies.
Before you travel, it’s a good idea to check your airline’s policies for storing medication so you have a clear understanding of what is and isn’t permitted.
Mounjaro can be injected just under the skin of your thigh, stomach, or upper arm (you may need help for this). It’s important to rotate your injection site each week to avoid irritation. This can be done by completely changing the area (for example, stomach week 1 and thigh week 2), or by using different parts of the same area.
After a few weeks of Mounjaro injections, you should have a clear understanding of which sites work best for you.
Yes, you can drink alcohol on Mounjaro, though it’s recommended to do so in moderation or avoid it completely. There is no interaction between Mounjaro and alcohol; however, the latter could exacerbate gastrointestinal side effects or lead to a fluctuation in blood sugar levels. The combination may also make you feel intoxicated more quickly.
Another potential risk of drinking alcohol on Mounjaro is that it can add empty calories to your diet, which may negatively impact your weight loss journey.
Determining whether Mounjaro is better than Wegovy is more nuanced than you might think. While tirzepatide is considered more effective for weight loss than semaglutide ( one clinical trial recorded a mean weight loss of 21.4% with Mounjaro versus 13.7% with Wergovy), other factors should be considered.
Some individuals may handle the side effects of one treatment better than the other. In addition, others might not be able to use a particular injection due to other medications they are taking. Ultimately, deciding the best option for you depends on your unique circumstances and lifestyle.
Yes, you can switch to Mounjaro from other weight loss treatments, regardless of whether they are injections or tablets. Doing so requires careful consideration, so it’s essential to consult a clinician or other medical professional before making any changes to your medication. This is to determine whether Mounjaro is a suitable option for your circumstances.
If you’re ever unsure which weight loss aid is most appropriate, our experienced team is here to help.
There are several alternatives to Mounjaro for weight loss, both in injection and tablet form. Each treatment has its own characteristics and mechanisms of action, so it’s essential to consult a clinician to determine which option is most beneficial for you.
At Weight Loss Journey, we offer the following effective weight loss treatments:
Here are some sources to help you learn more about mounjaro , how it works, and clinical studies related to the drug.
American Diabetes Association (2023)
Eli Lilly
Wiley (2020)
EMC (2025)
NHS England
The Pharmaceutical Journal (2025)
Eli Lilly (2025)
Journal of Obesity (2010)
EMC (2023)
Weight Loss Journey is pleased to provide you with a wide selection of alternative treatments to help you reach your goals.

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Published on: 11/12/2025Reviewed on: 11/12/2025