• Always in stock
  • 21% average weight loss¹
  • 20+ years in obesity care
  • Quick approval and weight tracking in the SemaPen app

Your journey starts in the app

Unlock tailored support, weight tracking and more.

1

Download the free app

2

Take your digital consultation

3

Start your programme

Why purchase Mounjaro online through the SemaPen app?

Here's what you get when you buy Mounjaro online through one of the UK's best weight loss apps. Developed by the weight loss specialists at SemaPen, it's full of supportive features to help you on your weight loss journey.

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The right dose when you need it

Once you've downloaded the app and subscribed to our Mounjaro programme, we'll quickly send you the right Mounjaro pens when you need them. You'll also get a sharps bin to dispose of needles safely.

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Personalised, professional support

Choose the level of support you need on our app. Get expert help to lose weight safely and steadily, from smart health tracking to face-to-face video consultations with specialist dietitians.

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Fast, discreet delivery

You can share your success when you're ready. That's why your Mounjaro weight loss injections come directly to your door in discreet packaging.

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Money-back guarantee

That's right. If you don't achieve at least 5% weight loss after you purchase Mounjaro online and complete the programme, we'll provide a refund.*

Weight loss reimagined with the SemaPen app

The SemaPen app is your all-in-one weight loss companion. It brings together everything you need to lose weight safely and sustainably on one easy-to-use platform.


We've combined obesity expertise with next-gen tech to help you lose weight and feel healthier – no matter your starting point or support needs.

What you get with SemaPen

Quick and easy onboarding

Take the digital consultation and get started quickly and easily after your first video appointment. Once you're on board, you can access all that our app has to offer and start your weight loss journey immediately without compromising on safety.

Choice of three expert-led weight loss programmes

We'll recommend the science-backed weight loss programme that aligns with your current health and future weight loss goals. That could be our medication-free SemaHealth programme or one that uses the game-changing injections Mounjaro or Wegovy.

Features to support your health

From intelligent weight tracking to exclusive lessons and recipes, our app is packed with useful features to keep you motivated and keep you on track.

Personalised online fitness programme

Sign up for our Gold or Platinum support plans, and you'll unlock a tailored, 10-month online fitness programme from Sword Health. With a dedicated physiotherapist and smart fitness band included, it makes it easy to stay active and healthy at home.

Support plans to suit you

Weight loss is harder than it needs to be if you don't have the right support in place – and that support looks different for everyone. We have three tiers of support available through our app, so anyone can get the help they need.

SemaPen support plans

Silver Gold Platinum
Expert support to help you meet your weight-loss goals Face-to-face video support and more for just £2.26** extra per day The ultimate weight loss plan – including expert psychological support
Starts at £225 / month† Starts at £295 / month‡ Starts at £381 / month§
Introduce a friend and get 10% off your next pen for each introduction. Introduce a friend and get 10% off your next pen for each introduction. Introduce a friend and get 10% off your next pen for each introduction.

What's included

Silver Gold Platinum
Mounjaro pen (sent monthly)
Sharps bin for safe needle disposal
Welcome video consultation
Dedicated patient support team
Exclusive SemaPen Academy content
Health dashboard to track progress
Calorie/nutrition tracker***
Weight monitoring and advice from clinical team
Clinical support by email
Withings® Body scale (tracks weight and BMI via the app)
Upgraded Withings® Body Smart scale (also tracks body fat percentage)
Personalised 10-month online fitness programme with dedicated physiotherapist and smart fitness device
SemaPen Essentials (monthly vitamins for weight loss)
SemaPen Advanced (tailored vitamins for GLP-1 treatment)
Simple home blood test for common health problems
Advanced home blood test with in-depth analysis of vitamin and nutrient levels
30-minute video consultation with a specialist dietitian One included – plus 50% off further consultations Included – on demand****
60-minute video consultation with a clinical psychologist One session included
Health assessment from a SemaPen nurse in your home or workplace

† Price rises as the programme progresses, reaching £349 from month 5 onwards. Early cancellation incurs a fee of £90.

‡ Price rises as the programme progresses, reaching £419 from month 5 onwards. You'll unlock a loyalty discount at month 7, when the price drops to £399 for the remainder of the programme. Early cancellation incurs a fee of up to £350.

§ Price rises as the programme progresses, reaching £505 from month 5 onwards. You'll unlock a loyalty discount at month 7, when the price drops to £485 for the remainder of the programme. Early cancellation incurs a fee of up to £550.

The benefits of Mounjaro injections for weight loss

The Mounjaro (tirzepatide) injection is a revolutionary obesity treatment. With Mounjaro, most patients lose around 21% of their body weight.¹

  • Controls food cravings
  • Improves metabolic function
  • Reduces dangerous belly fat

Mounjaro (tirzepatide) is the latest in a class of clinically proven obesity treatments that also includes Wegovy. In a 72-week clinical trial, Mounjaro patients lost around 21% of their body weight on average.¹


Like Wegovy, Mounjaro is an injection that you take once per week at home. However, patients who buy tirzepatide and follow their programme effectively tend to experience
more weight loss and fewer side effects than those who take Wegovy. 


Mounjaro is not a replacement for a balanced diet and regular exercise. However, if you've tried diet and exercise and didn't see the results you want, Mounjaro may help make these lifestyle changes
more effective.


The first step is to take a digital consultation through our app. We'll
tell you instantly whether you're eligible for Mounjaro. If not, we may recommend another programme like Wegovy or our drug-free SemaHealth programme. Either way, you'll have access to unmatched professional and practical support to help you reach your goals.

How to buy Mounjaro medication

Mounjaro is clinically proven to help with weight loss in around 95% of patients. However, it's important to get professional medical advice to make sure the treatment is right for you.


The good news is that we've made it simple. Our experts have designed a digital consultation that tells you instantly whether you're eligible to buy Mounjaro online in the UK through SemaPen. This means no hanging around for in-person appointments or paperwork.

1. Get started with the app

To buy Mounjaro online in the UK, you must first have a digital consultation. Ours is designed by weight loss experts and tells you instantly if you're eligible for treatment. Not quite right for you? Don't worry – we can recommend other programmes to suit your needs.

App Store Google Play

2. Pick your support plan

Explore our Silver, Gold and Platinum options and select the level of care that fits your needs. Then you can complete your onboarding process with expert support ready to go.

What's included

3. Receive your first Mounjaro pen

Got the go-ahead from our experts? We'll automatically send the doses you need. Your first Mounjaro pen should arrive within a few days.

What dosage?

4. Get tailored support as you go

Your success is our goal. That's why we monitor your progress through the app and provide tailored advice to keep you on track. Gold and Platinum subscribers also have the option to book specialist video consultations and health checks.

What can I expect?

How the SemaPen programme works

Thanks to our advanced SemaPen app and expert advice, weight loss just got a whole lot simpler.

Here's the thing. Online pharmacies often sell you medication and leave you to figure things out on your own.


But SemaPen is different. As soon as you subscribe to your programme, you'll unlock all the professional and practical support you need to lose weight and improve your health. Our aim? To give you the best chance of long-term success.


This means automatic delivery of each new dose. It means daily support through our app and personalised weight loss guidance from real experts. And it means no in-person appointments, pharmacy visits or restrictive fad diets.


It's weight loss made simple. Finally.

What to expect

Signposts for success

It's weight loss with a clear way forward. When you subscribe to SemaPen, you're joining a guided programme designed by UK obesity experts. Plus, you'll get access to our revolutionary app and support plans to help keep you on track.

Internet-enabled smart scale

Say 'no' to tedious updates and check-ins. You'll receive a £60 Withings® Body scale that sends updates to the app in real time. That means you and your team can track your journey together through your health dashboard. Easy.

Peace of mind

You're free to cancel your subscription at any time.***** And if you don't lose at least 5% of your body weight, you'll get your money back.*

The SemaPen app

Get onboarded onto our app for quick approval if eligible – and take advantage of all the expertise and support you need to lose weight and live healthier. Manage your programme, track your weight and health, learn good habits with SemaPen Academy and more.

Taking Mounjaro: a step-by-step guide

1. Prepare and inspect

Wash your hands thoroughly. Pull the cap off the Mounjaro pen and inspect the medication. Don't use it if it's expired, has the wrong dosage or looks discoloured or cloudy.

2. Attach the needle

Wipe the pen's inner seal with a swab. Select a new needle, remove the paper tab and screw it onto the pen. Pull off the inner and outer shields to reveal the needle.

3. Check the flow

Dial the pen until it reaches the prime position (marked by an extended line). Hold the pen upright, give it a few taps and push the dose knob until you see liquid squirt out.

4. Prepare your dose

Turn the dial until you see the number 1 in the window. This indicates one full dose. The dial should stop here.

5. Inject the needle

Take your Mounjaro injection by inserting the needle into the soft part of your belly or thigh. Push the dose knob and hold it down for 5 seconds.

6. Wait a week and repeat

Each Mounjaro pen contains enough medication for 4 doses (one per week for a month). It's a good idea to rotate injection sites with each weekly dose.

Mounjaro dosage chart

You should take Mounjaro injections for weight loss once per week. You must take the medication on the same day each week. However, you can take it at any time of day, and you don't need to take it with meals.


The starting dose is 2.5mg per week. After your first month, we'll send you a new pen with a 5mg dose. The dose increases each month until it reaches 15mg from month six onwards.


It's important to increase the dose gradually because it takes time for your body to adjust to the medication. But don't worry about remembering to order the right dose. Subscribe to our Mounjaro programme and we'll automatically send you the right pen at the right time.

What are the possible side effects?

Like all medications, Mounjaro can cause unwanted reactions or side effects.


The most common side effects experienced by Mounjaro patients are nausea and stomach upsets, including diarrhoea, vomiting and tummy pain. These side effects are fairly common but tend to happen less with Mounjaro than
Wegovy.


For most patients, the side effects aren't too bad and can be treated effectively with home remedies. Many find they get less pronounced as they continue the treatment, too. However, they often get worse for a time when patients step up to a higher dose.


Mounjaro is also known to make the oral contraceptive pill work less effectively. If you currently take the contraceptive pill, you should change to an alternative form of contraception while using Mounjaro.


You may have heard of people experiencing hair loss or hair thinning while using Mounjaro. This affects a minority of patients but is actually caused by rapid weight loss, not by the medication itself. For most people, the hair thinning or loss gets better as they continue the treatment.


You should also be cautious of online platforms that offer Mounjaro for sale but lack credentials or do not require consultations. These platforms may be selling unsafe products.


This is not an exhaustive list of side effects. For more information, read our guide to the
side effects of weight loss drugs.

Have another question?

If you didn't find the answer you need here, check our expert FAQs or drop us a message online.

Meet your experts

SemaPen is part of Phoenix Health, the only private bariatric provider trusted to provide NHS treatment. Meet the experts who work for your success.

Ready to get started?

Download our app and start your digital consultation today. You'll find out instantly if you're eligible to purchase Mounjaro online through SemaPen.