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Mounjaro (tirzepatide) is a weekly injectable medication that can help you lose weight by activating GIP and GLP-1 receptors. Once activated, these receptors help to control your appetite by tricking your brain into thinking that you aren’t hungry. These also slow down your digestion so that you feel fuller for longer.
Mounjaro was originally developed as a treatment for type 2 diabetes, but has now been approved to help with weight management. Treatment starts with a low 2.5mg dose of Mounjaro, and your pharmacist will gradually increase the dose. This gives your body the chance to adjust to the treatment, which can help to minimise side effects. Your maximum dose will be a careful balance of achieving the desired effect (weight loss) while keeping side effects to a minimum.
The Mounjaro KwikPen makes administration simple - it’s been designed to make self-injection as easy as possible.
Mounjaro is a weight loss medication that’s taken as a weekly injection. Mounjaro works by acting on the hormones that control your hunger, reducing your appetite and helping you feel fuller for longer. The medication is often prescribed for adults who have type II diabetes or other weight-related health conditions.
If you haven’t had pancreatitis or serious digestive issues, you may be able to take Mounjaro. However, Mounjaro could interact with other medications and may cause some side effects, so it’s essential you book a consultation with a licensed clinician before taking the weight loss injections.
Studies have shown that you could lose up to 22.5% of your body weight after 72 weeks of Mounjaro treatment. So, if you weigh 100kg (15st 10lbs) at the start of treatment, you could lose 22.5kg (3st 7lbs) within 18 months.
Mounjaro works by mimicking two hormones that are naturally produced by your gut. These hormones trigger receptors in your body that tell your brain that you’re full. By mimicking these hormones, Mounjaro may reduce your appetite and help you feel fuller for longer so that you eat less.
Mounjaro comes in specially designed ‘Kwikpens’, making it easy for you to inject the medication at home.
Yes, this is possible under medical supervision. While both medicines help with weight loss and blood sugar control, they work slightly differently and have different dosing schedules.
You cannot alternate between the two medications or inject both medications at the same time. However, you can make a permanent switch from one to the other.
Find out more by reading our switching guide here.
*Based on patients using Mounjaro 15mg during the 72-week SURMOUNT-1 trial
The usual starting dose of Mounjaro is 2.5mg per week. Once your body has adjusted to the medication, your doctor will slowly increase the amount of Mounjaro you take to find the dose that best balances effectiveness with managing side effects. The maximum recommended dose of Mounjaro is 15mg per week.
The main active ingredient in Mounjaro is tirzepatide. This is the medication that mimics your hormones and helps reduce your appetite.
The other ingredients contained in Mounjaro are sodium phosphate dibasic heptahydrate, benzyl alcohol, glycerol, phenol, sodium chloride, sodium hydroxide, concentrated hydrochloric acid and water for injections.
Like all medications, Mounjaro may cause some side effects. If you take Mounjaro, you could experience nausea, stomach pain, constipation, indigestion and diarrhoea. You may also feel dizzy or lightheaded and could feel more tired than usual.
In very rare cases, Mounjaro could cause more serious side effects such as an allergic reaction, pancreatitis or gallbladder disease.
Mounjaro is not suitable for you if you have a personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2), or are allergic to tirzepatide or any other of the ingredients.
You should also not take Mounjaro if you are pregnant, planning to become pregnant or breastfeeding. It may harm your baby.
You should let your doctor know if you have a history of pancreatitis, gallbladder disease, or kidney problems, as these mean that Mounjaro may not be right for you. If you’re taking oral contraceptives, you should note that Mounjaro can make them less effective, so you should add a non-hormonal method and/or barrier method, such as condoms.
This service may not be suitable for all patients, including some older adults or those with complex health conditions.
On the 1st September 2025, Eli Lilly, the company that manufactures Mounjaro, decided to increase the price of the medication. This price rise will affect all regulated suppliers of Mounjaro.
If you’re concerned about how the cost increase will affect you, speak to a member of our team about alternative treatment options.
The Mounjaro Kwikpen is the device you’ll use to inject your weekly dose of Mounjaro. It comes loaded with pre-measured doses of the weight loss medication and is designed to be easy to use at home.
The doses of Mounjaro contained in a Kwikpen can vary from 2.5mg to 15mg. So, it’s important to select a Kwikpen that contains the correct amount for your needs.
The Mounjaro Kwikpen has been created as a treatment for self-administration, so injecting yourself should be straightforward. You’re likely to feel a small pinch when the needle goes in and may find the skin around the injection site is a little sore for a few hours afterwards.
You may feel a little nervous the first few times you use the Mounjaro Kwikpen. But don’t worry, most people find they get used to self-injecting very quickly and are able to use the pen without a problem.
Yes, Mounjaro is a prescription-only medication. So, whether you go through the NHS or decide to go private, you’ll need a prescription before you can purchase the weight loss medication.
At the moment, Mounjaro is only available on the NHS to patients who meet strict eligibility criteria. So, you may find that it’s quicker and easier to get a private prescription.
Once you have your prescription, you can purchase Mounjaro from a registered and licensed UK pharmacy such as The Independent Pharmacy.
The Mounjaro Kwikpen is designed to be easy to use at home. Before injecting yourself for the first time, it’s important to read all the instructions that come with the pen, so you feel comfortable using the device.
If you still have some questions about using the Kwikpen, or just need a little reassurance before you get going, take a look at our Kwikpen guide.
You should store your unused Mounjaro Kwikpens in the fridge at a temperature between 2˚and 8˚C. After the first use, you can keep your Mounjaro Kwikpen out of the fridge for up to 30 days. Always keep your Mounjaro in its original packaging and store it somewhere cool, dark and dry.
Yes, you can buy Mounjaro in the UK. It is available on the NHS (to patients who meet strict eligibility criteria) and you can also buy it privately from licensed and registered pharmacies.
When buying Mounjaro, it’s essential that you choose a trusted supplier as this ensures the advice that you’re given is accurate and the medication you receive is safe to use.
No, tirzepatide, the active ingredient in Mounjaro, is not considered to be addictive. However, you may need to take the medication long term, as stopping Mounjaro treatment could cause you to regain the weight that you’ve worked so hard to lose.
If you suddenly stop using Mounjaro, you may experience some side effects as your body readjusts to its natural hormonal state. If you want to stop using Mounjaro, speak to a member of our team about how to safely end your Mounjaro treatment.
There are a number of side effects associated with Mounjaro. Though, as everyone reacts differently to the medication, there’s no way to know if you will experience any Mounjaro side effects or how severe they may be.
The most common side effects of Mounjaro are:
Most people find that side effects are mild and begin to ease as their body adjusts to the medication. Speak to a healthcare professional if you’re concerned about any of the symptoms you’re experiencing.
Mounjaro could react with some other medications like blood thinners (such as Warfarin) and insulin. If you take any other prescription or non-prescription medications, make sure you tell a member of our clinical team during your consultation.
Mounjaro for weight loss will shortly be made available to people with a body mass index (BMI) of over 30 and who have at least one weight-related health problems like pre-diabetes, high blood pressure, high cholesterol or heart issues. It is already prescribed for the treatment of type II diabetes.
If you have diabetes, or are from a Black African, African-Caribbean, Asian, South Asian, Chinese or Middle Eastern background, you may be able to get Mounjaro with a lower BMI. This is because you’re at higher risk from weight-related health problems.
Weight loss medications like Mounjaro could potentially make oral contraceptives less effective. This means it could be easier for you to become pregnant by accident.
If you take an oral contraceptive and want to use Mounjaro to lose weight, you may need to use additional protection or switch to a non-oral contraceptive.
Mounjaro is not recommended for women who are pregnant or who are trying to become pregnant.
If you feel ready to take the next step on your weight loss journey, we’re here to help. Complete a free, easy online consultation and our team will assess your health and make recommendations based on your specific circumstances.
The process is quick, easy and discreet and will help you take control of your health and get your weight loss plan back on track.
The amount of weight you lose with Mounjaro will depend on your starting weight, your diet, and how much exercise you do. In general, the more overweight you are, the more weight you will lose.
If you increase your activity level, eat well and stick to your Mounjaro injection schedule, you could lose up to 25% of your starting body weight after 72 weeks. So, if you currently weigh 100kg, you could drop up to 25kg of excess weight.
We think accessing healthcare should be easy. Whether we’re fulfilling NHS prescriptions or helping people find the right treatments, we aim to offer our customers dependable, economical and convenient access to medicines with a personal and discreet service.
Visit our Weight Loss page for treatments, advice and FAQs.
Our expert clinical team have published a range of reviewed and clinically-sourced information on Mounjaro to ensure our patients have all the information they need on their weight loss journey.
