Mounjaro Weight Loss Injection Pens
You can buy Mounjaro online through our online prescribing service. Mounjaro is the latest GLP-1 weight loss injection available, and is the most effective. It has surpassed the effectiveness of Semaglutide (Ozempic + Wegovy), with patients seeing as much as 22.5% body weight loss.
You can order Mounjaro after completing an online assessment with our clinicians. If they choose to prescribe Mounjaro, this is passed to our pharmacy team, who prepare and post your treatment.
Wegovy is from the same family of drugs, and is licensed for weight loss use. You can read our guide on how patients can switch from Wegovy to Mounjaro, if you are interested in switching treatment.
Mounjaro Summary
| Price | From 210 USD / Month |
| How it works | Suppresses appetite |
| Effectiveness | 16-22.5% loss depending on the dose |
| Eligibility | BMI over 30, or over 27 with a weight-related condition, such as high blood pressure or high cholesterol |
| Side effects | Common side effects include fatigue, dizziness, nausea |
| Dosage | Starting at 2.5mg ONCE weekly.Titrating up by 2.5mg each month.Maximum dosage of 15mg ONCE weekly. |
What Is Mounjaro?
Mounjaro is a highly effective, weight loss treatment. It has been shown in clinical trials to help achieve up to 22.5% body weight loss. It is the latest GLP-1 weight loss medication, and is used for people with a body mass index (BMI) over 30. It can also be prescribed for patients with a BMI of 27+ and a weight-related medical condition, such as high blood pressure or high cholesterol.
The active ingredient tirzepatide is a registered trademark of Eli Lilly.
It is known as Zepbound in the US, but launched under the brand name Mounjaro.
It is used ONCE weekly, as a subcutaneous (under the skin) injection. More information on how to inject Mounjaro can be found in the Patient Information Leaflet.
How It Works
Mounjaro weight loss pens mimic the action of GLP-1, a natural hormone produced in the gut. This innovative treatment promotes significant weight loss for patients by acting similarly to GLP-1. Its two main effects are;
- It helps regulate appetite, making it easier to eat less
- It makes you feel fuller for longer
Both actions lead to eating fewer calories, which results in weight loss. Focusing on a reduced-calorie diet can amplify the benefits.
A full account of how Mounjaro works can be found in our guide.
Is It For Me?
Mounjaro should only be used to support weight loss if lifestyle changes like regular exercise and diet haven’t been successful. Other GLP-1 medications are also available, including Saxenda, Wegovy and Ozempic.
Mounjaro can be used for patients who have a BMI of over 30, or in patients with a BMI over 27, and other risk factors such as;
- Diabetes type 2
- High cholesterol
- Obstructive sleep apnoea
- High blood pressure
You can read Mounjaro reviews from UK patients who have used this treatment through our service.
How Effective Is Mounjaro?
When using Mounjaro KwikPens to suppress appetite, you can expect to lose around 16-22.5% of your initial body weight after completing treatment. This is the most effective of all the released GLP-1 medications so far.
These figures have been achieved by patients who have maintained on the highest strength of Mounjaro, which is the 15mg strength.
Patients who maintain at 10mg, lose on average 21%, while patients who maintain at 15mg, can lose around 22.5%.
The lower strengths of Mounjaro 2.5 and 5mg will not achieve the best results. While some weight loss will be observed, the primary function of these doses is to help your body adjust to the drug without experiencing serious side effects.
Dosage
The dosage table below outlines the recommended titration for Mounjaro when used for weight loss.
| Weeks | Dose | Notes |
|---|---|---|
| 1-4 | 2.5 mg once weekly | Initial dose for titration |
| 5-8 | 5 mg once weekly | Assess tolerance before increase |
| 9-12 | 7.5 mg once weekly | Assess tolerance before increase |
| 13-16 | 10 mg once weekly | Monitor for efficacy and tolerability |
| 17-20 | 12.5 mg once weekly | Further increase based on clinical response |
| 21 onwards | 15 mg once weekly | Maintenance dose if well tolerated |
While increasing the dose, if you find the side effects problematic, you should discuss this with your doctor or pharmacist. You can read more in our Mounjaro dosage and maintenance guide.
Mounjaro Pricing
Please note: Mounjaro prices changes are coming to learn more about prices changes read our supporting FAQ.
The cost of buying Mounjaro online starts from 210 USD / month. If titrating all the way up to the maximum dose and maintaining, the annual cost is 4,278 USD.
See our pricing table below or a full breakdown of Mounjaro prices.
| Dosage | New Patient Price |
|---|---|
| 1 Pen – 4 x 2.5mg doses | USD 210.00 |
| 1 Pen – 4 x 5mg doses | USD 250.99 |
| 1 Pen – 4 x 7.5mg doses | USD 330.00 |
| 1 Pen – 4 x 10mg doses | USD 380.00 |
| 1 Pen – 4 x 12.5mg doses | USD 380.99 |
| 1 Pen – 4 x 15mg doses | USD 410.99 |
NOTE: One pen contains four doses, so a pen lasts for 4 weeks.
Side Effects of Mounjaro
The most common side effects with Mounjaro affect the digestive system. These can include things like nausea, vomiting, diarrhoea and constipation. Most patients should see these effects subside after a few days.
Other common side effects include:
- Feeling weak or tired
- Dizziness
- Injection site reactions such as bruising, pain or a rash
The dosage titration of the drug is designed to minimise side effects. Starting with Mounjaro 2.5mg, and moving up through 5mg in 2.5mg increments, helps the body adjust to the drug’s impact. Doing this gradual titration, will allow you to minimise side effects and get the most out of your treatment.
You can read a full account of Mounjaro Side Effects in our advice pages.
Alternatives
The preferred and safest method of losing weight is via a healthy diet and increased physical exercise.
The NHS offers a 12-week weight loss plan for patients. Further information from the NHS is available for exercise and diets. As of 2025, Mounjaro is now available on the NHS. However, the criteria are different than for private prescribing.
Other GLP-1 drugs available as an alternative to Mounjaro include
For many individuals, injectable treatments may not be a preferred option. There are more traditional weight loss pills available from our weight loss service, such as Orlistat. This contains 120mg of the drug, and works by preventing 1/3rd of the fat from the food you eat from being absorbed.
Our advice guides explain how Mounjaro compares with Wegovy for weight loss, and how it differs from Ozempic.
| Medication | Price | % Average Weight Loss |
|---|---|---|
| Ozempic | From 150 USD per month | Up to 15% |
| Mounjaro (Tirzepatide) | From 200 USD per month | Up to 22% |
| Wegovy (Semaglutide) | From 120 USD per month | Up to 17% |
| Saxenda (Liraglutide) | From 100 USD per pen | Up to 10% |