Mounjaro Programme
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Always in stock

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First dose costs £159

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Trusted for 20+ years

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Instant approval if you meet criteria

Why choose SemaPen for Mounjaro medication?

Here's what you get when you buy Mounjaro online through UK specialist SemaPen.

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Mounjaro injections

As a subscriber, you'll automatically receive the right Mounjaro pen when you need it – as well as a sharps bin to dispose of needles safely.

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Tailored support at no extra cost

You'll always know your next steps with SemaPen. Diet advice, lifestyle tips and expert support come as standard.

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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 completing the programme, we'll provide a refund. Simple.**

The benefits of Mounjaro injections for weight loss

The Mounjaro (tirzepatide) injection is a revolutionary obesity treatment. With Mounjaro, you can expect to lose around 21% of your body weight.*

  • Controls food cravings
  • Boosts metabolism
  • Reduces dangerous belly fat

Mounjaro 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.*


Like Wegovy, Mounjaro is an injection that you take once per week at home. However, Mounjaro patients 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 an online consultation. We'll tell you instantly whether you're eligible and give you tailored advice to help you meet your goals.

Get a consultation

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 an online consultation that tells you instantly whether you're eligible. This means no appointments and no waiting.

1. Apply online

To buy Mounjaro online in the UK, you must first have an online consultation. Ours is designed by weight loss experts and tells you instantly if you're eligible for treatment.

Apply now

2. Receive your first Mounjaro pen

Got the go-ahead from our doctors? Subscribe to SemaPen and we'll automatically send the doses you need. Your first Mounjaro pen should arrive within a few days.

What dosage?

3. Get tailored support as you go

Your success is our goal. That's why our specialists monitor your progress in the cloud and provide up-to-the-minute advice to keep you on track.

What can I expect?

How the SemaPen programme works

Thanks to SemaPen's Mounjaro pen subscription service, weight loss just got a whole lot simpler.

Online pharmacies often sell you medication and leave you to figure things out on your own.


But SemaPen is different. When you subscribe to our programme, you get ongoing support to give you the best chance of long-term success.


This means automatic delivery of each new dose. It means personalised weight loss guidance from real experts, whenever you need it. 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. As a SemaPen subscriber, you're joining a guided programme designed by some of the UK's most trusted obesity experts.

Cloud-enabled smart scale

Say 'no' to tedious updates and check-ins. You'll receive a £60 Withings® Body scale that sends updates to our team in real time. 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

Be part of the SemaPen community. With our app, you'll get exclusive diet advice and weight loss tips, as well as a direct line to our experts.

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 the SemaPen programme and we'll automatically send you the right pen at the right time.

A purple and white pen with the word mounjaro on it
A purple and white bottle of mounjaro insulin
A mountaro 7.5 ml syringe with a purple cap
A purple and white mountaro pen with a purple cap
A white and purple mountaro pen with a purple cap
A white and purple pen with the word mounjaro on it

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 drug itself. For most people, the hair thinning or loss gets better as they continue the treatment.


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.

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Ready to get started?

Start your online consultation today and find out INSTANTLY if you're eligible.

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