Mounjaro (Tirzepatide) Weight Loss Injections
Clinically proven once-weekly injection that helps you lose up to 25% of your body weight. Prescribed by UK pharmacists, delivered discreetly to your door.
GPhC Registered
Pharmacy: 1088488
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Within 48 hours
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What is Mounjaro?
Mounjaro is a prescription weight loss medication that contains the active ingredient tirzepatide. It's the first and only dual-action treatment that activates both GLP-1 and GIP receptors — two natural hormones your body produces to regulate appetite and blood sugar.
Mounjaro comes as a pre-filled injection pen that you use once a week, on the same day each week. It's designed to be simple to use at home, with no mixing or measuring required.
- Active ingredient
- Tirzepatide
- Medication class
- GLP-1 + GIP agonist
- Administration
- Once-weekly injection
- Available doses
- 2.5mg - 15mg
- Average weight loss
- Up to 25%
- Licensed in UK
- Yes (MHRA approved)
How is Mounjaro different from other weight loss injections?
While medications like Wegovy and Saxenda only activate the GLP-1 receptor, Mounjaro activates both GLP-1 and GIP receptors. This dual action is what makes Mounjaro particularly effective — clinical studies show it helps people lose up to 25% of their body weight, compared to 15-17% with other treatments.
Important Message Mounjaro is a prescription-only medicine (POM). You'll need an online consultation with one of our GPhC-registered clinicians who will assess your suitability before prescribing.
Mounjaro is manufactured by Eli Lilly and Company and is fully licensed in the UK for weight management by the Medicines and Healthcare products Regulatory Agency (MHRA).
How does Mounjaro
work in your body?
Mounjaro works by mimicking two natural hormones your gut produces after eating — GLP-1 and GIP. Together, these hormones send powerful signals to your brain and body that help you eat less and feel satisfied with smaller portions.
GLP-1 Actions
Glucagon-like peptide-1 is a hormone released by your intestines after you eat.
Reduce appetite
Sends signals to your brain that you're full, helping you feel satisfied sooner
Slows stomach emptying
Food stays in your stomach longer, keeping you fuller for longer.
Controls cravings
Quiets "food noise" — those constant thoughts about eating
Regulates blood sugar
Helps your body produce insulin when blood sugar rises
GIP Actions
Glucose-dependent insulinotropic polypeptide is the second hormone Mounjaro activates.
Enhances insulin response
Helps your body process sugar more efficiently
Promotes fat loss
Directly affects how your body breaks down fat stores
Reduces fat accumulation
Helps prevent new fat from being stored
Improves metabolism
Works alongside GLP-1 for better overall results
The Result
By activating both these hormone pathways, Mounjaro helps you naturally eat less without feeling constantly hungry or deprived. Most people notice reduced appetite within the first few weeks, with cravings and "food noise" significantly quieting as treatment continues.
What results can you expect
with Mounjaro?
Mounjaro is one of the most effective weight loss medications available. In clinical trials, people using Mounjaro at the highest dose (15mg) alongside healthy lifestyle changes lost an average of 22.5% of their starting body weight after 72 weeks.
Real Terms Examples
If you weigh 100kg (15st 10lb)
You could lose around 22.5kg (3st 7lb)
If you weigh 120kg (18st 12lb)
You could lose around 27kg (4st 3lb)
If you weigh 90kg (14st 2lb)
You could lose around 20kg (3st 2lb)
Estimated Weight Loss Timeline
- 4 weeks (1 month)
- Around 4% of body weight
- 8 weeks (2 months)
- Around 6% of body weight
- 16 weeks (4 months)
- Around 10% of body weight
- 32 weeks (8 months)
- Around 16% of body weight
- 48 weeks (1 year)
- Around 21% of body weight
- 72 weeks (18 months)
- Up to 25% of body weight
Disclaimer: Results shown are from clinical trials. Individual results vary, Mounjaro works best when combined with a reduced-calorie diet and increased physical activity. Your pharmacist will work with you to set realistic goals for your individual situation.
Real results
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How to use yourMounjaro pen
Simple, step-by-step injection guide
Mounjaro is designed to be simple to use at home. Each pen contains 4 weekly doses, and you'll use the same pen for 4 weeks before starting a new one. While injections might sound intimidating, most people find the pen easy to use after their first time — the needle is very small and most people report minimal discomfort.
When to inject: Once a week on the same day each week, at any time of day (with or without food). Set a weekly reminder on your phone so you don't forget.
Prepare your supplies
What you'll need:
- Your Mounjaro pen (check expiry date and liquid is clear)
- A new pen needle (included)
- Sharps disposal container
Wash your hands thoroughly and let the pen sit at room temperature for 15 minutes if refrigerated (this makes injection more comfortable).
Prime your pen
Inject your dose
Dispose safely
Where to inject
Choose one of these three areas. You can change areas each week if you like.
At least 5cm (2 inches) away from belly button. Most popular site — easy to reach. Rotate sites within the stomach area.
Upper, outer part of thighs. Good alternative to stomach.
Back or outer area of upper arm. May need someone to help inject here.
Important: Rotate your injection site each week. Using the same exact spot repeatedly can cause skin thickening and affect medication absorption.
Rotate Sites
Using different injection sites (stomach, thigh, arm) helps avoid skin irritation and ensures the medication works effectively.
Understanding your Mounjaro dosing schedule
Gradual dose increases for best results and minimal side effects.
What is dose titration?
Mounjaro uses a gradual dose increase approach called titration. You start at the lowest dose (2.5mg) and slowly increase every 4 weeks to help your body adjust and minimise side effects.
What if I miss a dose?
Within 4 days:
Take it as soon as you remember.
More than 4 days:
Skip that dose. Never double dose.
Standard dose progression
What’s included in your order
Everything you need to get started safely.
Sharps disposal container
Safe disposal container for used needles (included with first order only). Essential for safe needle disposal at home.
Patient information leaflet
Official product information from the manufacturer with detailed safety information, side effects, and usage instructions.
Injection technique guide
Step-by-step visual guide showing proper injection technique, site rotation, and best practices for comfortable injections.
Storage instructions
Clear guidance on how to properly store your Mounjaro pen before and after first use to maintain medication effectiveness.
Delivered directly to your door.
Clinician Video Call
Full review of your questionnaire
Ongoing support
Easy access to support from the clinical team
Fast Delivery
Discreet 48-hour shipping
Important: Each Mounjaro pen lasts for 4 weeks (4 doses). Most people need to reorder every 4 weeks to maintain consistent treatment. We make reordering simple — it is an optional subscription, all you need to put is your weight and the same dose will be dispensed (unless you’ve asked for higher/lower dose)
Possible Side Effects
Most side effects are temporary
They typically improve as your body adjusts to the medication and are most noticeable when starting or increasing doses.
Contact us with any more questions
Ready to start your weight loss journey with Mounjaro?
Getting started is simple and completely online — no GP appointment needed. Our UK Licenced Clinicians will assess your suitability and issue your prescription the same day.
Complete Your Online Consultation
Fill out our confidential medical questionnaire.
Clinician Review
You will be invited for a video call for weight verification if suitable for treatment. Your prescription will be issued on the same day.
Receive Your Treatment
Fast Discreet delivery - Tracked 48-hour delivery via Royal Mail.