Mounjaro dosages for weight loss

Mounjaro (tirzepatide) is a weight loss injection taken once per week. It follows a dosing schedule which involves increasing your dose every 4 weeks (unless advised to follow a lower maintenance dose).

Here, we look at the starting dose of Mounjaro, the purpose of increasing dosage, and answer all your questions about Mounjaro dosages.

If you're considering treatment, you can find full details on how Mounjaro works, pricing, and eligibility on our Mounjaro injections page.

Mounjaro is available in the following strengths (dosages):

• 2.5mg – always the starting dose
• 5mg – maintenance dose
• 7.5mg
• 10mg – maintenance dose
• 12.5mg
• 15mg – maximum maintenance dose

Mounjaro medication contains the active ingredient tirzepatide, which is prescribed in different quantities based on the stage of treatment you’re at. The lowest dose of Mounjaro is 2.5mg – which is the starting dose. The highest dose of Mounjaro is 15mg, which is only reached following a gradual dosage increase.

Your doctor should prescribe each dose for 4 weeks before increasing the dose. If you experience side effects or have successful weight loss results on a dose of 5mg or 10mg, your doctor may advise you to stay on a lower dose.

15mg is the maximum Mounjaro dosage – taking more than 15mg once a week could cause severe side effects.

Once you start Mounjaro, your dosage will change with time. Your doctor should only advise you to change your dose after at least 4 weeks of taking your current dose.

Here are some general guidelines for when to increase your Mounjaro dose:

The starting dose for Mounjaro is always 2.5mg for 4 weeks. This remains the same whether you’re starting the treatment for the first time, switching from another weight loss injection, or restarting after a break from Mounjaro.

Read more about what to expect from your first Mounjaro dose.

What is the maintenance dose for Mounjaro?

The maintenance dose is the dose you take for the duration of your treatment. This is typically the lowest effective dose you will stay on to keep the weight off once you have reached your weight loss goal or are close to it and no longer need to increase your dose.

The right maintenance dose for you will depend on several factors, such as:

• how much weight you have lost
• any side effects you may have experienced
• the lifestyle changes you’ve made
• your appetite and cravings
• your weight loss goals

A doctor will help you find the correct maintenance dose, which may involve adjusting it before settling on the one that works for you. For example, if you are on the 10mg dose and have reached your weight loss goal, you may not need to move up to a higher dose. Alternatively, if you are looking to taper your treatment but maintain your progress, your doctor may discuss stepping down to a lower dose.

Why do you have to increase the doses of Mounjaro?

Broadly speaking, you have to increase the doses of Mounjaro to get better weight loss results. Studies have shown that people can lose an average 22.5% of their initial weight at the highest dose of 15mg.

Gradually increasing the doses of Mounjaro also lessens the risks of side effects and helps your body get used to the treatment. This process is called titration.

Exactly when to increase your Mounjaro dose and by how much depends on your individual response to treatment. While most patients increase their dose every 4 weeks, this is not always the right option for some people.

When you use ZAVA’s weight loss service, our doctors are available to make sure that you’re getting the right results from your new weight loss treatment. It’s important that you are comfortable and safe during your treatment, and our doctors can support you every step of the way.

What is titration?

Titration is the process of gradually increasing the medication dose over time, typically spanning several days, weeks, or months. Mounjaro is gradually titrated, typically increasing every 4 weeks until you reach the maximum or most tolerable maintenance dose for you. This allows your body to get used to the treatment, lowering the chances of side effects, and supporting safe and sustainable weight loss.

How many Mounjaro pens will I need?

The number of Mounjaro pens you will need depends on how long your treatment lasts. Each Mounjaro pen contains 4 doses and lasts for 4 weeks. You’ll usually stay on the same Mounjaro doses for 4 weeks before titrating up (moving up a dose), unless you remain on a lower dose for longer or have reached the maintenance dose that works best for you.

If you follow the typical dosage schedule, it will take 6 pens to reach the maximum maintenance dose (15mg).

Mounjaro should start to work at 2.5mg, which is the starting dose for the treatment. After just one or a few doses, you may feel fuller after eating or feel like your appetite has decreased, but it can take longer for you to start losing weight.

If you have started Mounjaro and feel as though it is not working, you should speak with your doctor. It may be the case that the treatment is not right for you, or you may need to increase your dose if you are on a dose below 15mg.

The most effective dose of Mounjaro for weight loss is 15mg, which is the maximum dose. High doses of Mounjaro are typically more effective for weight loss and lead to better weight loss results, but are not always recommended for everyone. You should build up your dosage by following a schedule and the advice of your doctor.

Mounjaro comes as an injectable pen, with pre-filled doses, allowing you to inject the right amount with ease. When taking your dose of Mounjaro, you must:

• take it once a week, at the same time and same day
• inject it into the upper legs, abdomen or you can inject into the upper arms with the help from somebody else
• switch where you inject each week to prevent irritation

Mounjaro is injected into the abdomen, upper arms (with the help of someone else), or the thighs.

For more information on how to dose Mounjaro, view our step-by-step guide and be sure to follow the guidelines in the patient information leaflet.

If you have any concerns, you should speak to your doctor or a pharmacist.

When you’re twisting your Mounjaro pen to the correct dose, you will hear small clicks as you twist the dose counter. Generally, you should hear 2 clicks when injecting your Mounjaro dose.

You should hear a click when you’ve pressed the button and the injection has started, and the second click happens once the injection is complete.

Before each injection, you’ll need to first listen for 2 additional clicks that let you know that the pen has been activated, or ‘primed’. People tend to use clicks and doses interchangeably, but there are more clicks than doses in a Mounjaro pen.

How do I change the dose on my Mounjaro pen?

Mounjaro is only available in the form of a pre-filled injectable pen, meaning it is not possible to change the dose inside it. Each pen comes with 4 doses containing a fixed amount to be injected once a week for 4 weeks.

You should finish each pen before increasing your dose.

If you have any concerns about your Mounjaro dose or want to change your dose due to side effects, speak with your doctor. Never try to change your dosage without approval from a doctor.

What if I miss a dose of Mounjaro?

If you miss the day and time you usually take your medication, don’t worry. Here’s what to do if you miss your Mounjaro dose:

1. If it has been 4 days or less since you should have taken your dose, you can still take it. After this, inject your next dose as usual on your usual scheduled day.
2. If it has been more than 4 days, or 96 hours, since you should have taken Mounjaro, skip the missed dose, then inject your next dose as usual on your next scheduled day.

Do not take 2 doses at once to make up for a missed dose.

There should always be at least 3 days between your Mounjaro doses. If you have any concerns or queries about missing Mounjaro doses, speak with your doctor or a pharmacist.

Can I split my Mounjaro dose?

No, you shouldn’t split your Mounjaro dose.

Mounjaro pens are pre-filled with the prescribed dosage which should be injected once a week at the same day and time. Splitting your dose of Mounjaro means you don’t get the correct amount of medication. As a result, the medication will be less effective.

Then, it may take you longer to reach your weight loss goals, and you may be more at risk of experiencing side effects.

It would also be difficult to split a dose of Mounjaro due to the fact that it is a pre-dosed injectable pen. You should never use the same needle on a pen twice.

If you have any specific questions about splitting your Mounjaro dose, speak with your doctor. You should only ever take your treatment as directed by your doctor.

What should I do if I take too much Mounjaro?

Speak to your doctor immediately, even if you are not experiencing any symptoms.

Too much Mounjaro may cause low blood sugar and could make you feel sick, or be sick. To be safe, get in touch with your doctor if you think you have taken too much Mounjaro and they can advise the best course of action for your safety.

If you have taken too much Mounjaro and are experiencing side effects that are significantly affecting you, dial 999 or go to A&E.

What if I want to change the day I take Mounjaro?

You can change the day you take your Mounjaro injection, but be sure that you leave at least 3 days (72 hours) since you took the last dose.

For example: if you usually take your injection on a Monday at 8am, and you want to change this to a Tuesday at 8am, you would need to wait until the following Tuesday (8 days).

After this, you can take your next dose on that same day the following week, and so on. Once you’ve changed your dose, it is best to try and stick to the same day and time each week. Changing the day that you take your Mounjaro dose can reduce its effectiveness.

Taking your weight loss medication abroad may seem nerve-wracking at first. The good news is that as long as you’re prepared, travelling with Mounjaro injections shouldn’t be a problem.

Dosage while abroad

If your trip falls on one or more planned injection days, ensure that you bring the required doses with you. While Mounjaro works best when taken at the same time each week, we understand that it can be difficult when travelling to find a suitable time or place to administer your injection. Changes in time zones might also impact your dosage schedule. However, it’s perfectly fine to take your injection a day or two later than your usual dosage time, as long as it’s not more than 4 days (96 hours) since your last dose, otherwise you’ll need to skip it.

If you’re worried about when and where you’ll be able to take your Mounjaro dose on holiday, the best thing to do is plan ahead to ease your stress, or speak to your doctor for advice.

Can you skip your Mounjaro dose on holiday?

While it’s possible to pause or skip your weight loss treatment for a week, we wouldn’t recommend this, as it can set you back in your weight loss journey. This is because the effects of the medication may begin to wear off, and your appetite could start increasing. Skipping your treatment for 2 weeks or more means that you’ll need to go back to the lowest Mounjaro dose (2.5mg) when you return home.

Your treatment plan doesn’t have to be restrictive, however. Providing you experience mild or no side effects, you can still indulge and enjoy food and drink on holiday while on weight loss medication. Learn more about adapting your diet to Mounjaro, and read our advice on combining Mounjaro and alcohol to prepare for your upcoming trip.

There are many criteria that doctors take into account when deciding which Mounjaro dose is best, but the main factors affecting your dose are:

• whether you’re already using Mounjaro
• how long you’ve been taking Mounjaro
• which maintenance dose suits you
• whether you’re experiencing side effects

If you’re not already taking Mounjaro, you will start on the lowest dose of 2.5mg. If you’re already taking Mounjaro, your dosage will be increased every 4 weeks up to a maintenance dose of 5mg, 10mg or 15mg.

The maintenance dosage of Mounjaro that you are advised to stick with will depend on:

• whether treatment is effective on lower doses
• any side effects you experience at higher doses

If I improve my diet and exercise routine, will my Mounjaro dosage be lowered?

Improving your diet and exercise routine will not necessarily mean that your Mounjaro dose will be lowered.

Your doctor should adjust your Mounjaro dose according to how effective the treatment is for you, and/or whether you are experiencing side effects. Pre-existing health conditions including type 2 diabetes, and other personal needs are also factored into dosage.

If you find that you are following a low-calorie diet, taking up regular exercise and your body is responding well to the dosage you have been prescribed, it is likely that all of these factors are contributing to the effectiveness of your treatment.

Speak with your doctor if you are unsure about the necessary steps you should take when it comes to exercise and nutrition when taking Mounjaro.

For more general guidance on nutrition and exercise, take a look at the NHS Eat Well guide, Better Health Food Scanner app, or NHS Live Well Exercise guide.

What if I cannot tolerate my new dose?

If since taking your current dose of Mounjaro you are experiencing side effects that are affecting your daily life, you need to speak to your doctor as soon as possible.

Your doctor may suggest moving down to or staying on a lower dose. You may possibly try a higher dose again after 4 weeks, or if you’re happy with your weight loss results so far, you may stay on a (potentially lower) maintenance dose that you can tolerate. You might be able to increase your dose again later.

It’s fairly normal when starting a new Mounjaro dose to get side effects like feeling or being sick. They are not usually severe and should go away over time.

To help with side effects, we recommend that you:

• stop eating when you feel full
• avoid fatty, deep-fried or greasy foods such as takeaways, dairy products like cheese and butter and cakes or pastries
• try bland foods (such as crackers or toast)
• eat smaller meals throughout the day
• keep hydrated and drink plenty of water

If you are concerned about whether or not Mounjaro is right for you, be sure to speak with your doctor or a pharmacist.

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Endocrine via Springer https://link.springer.com/article/10.1007/s12020-024-03896-z#:~:text=Conclusion,for%20long%2Dterm%20weight%20management. [accessed 15 July 2025]

NHS BMI https://www.nhs.uk/health-assessment-tools/calculate-your-body-mass-index/ [accessed 15 July 2025]

NHS Eat Well https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/the-eatwell-guide/ [accessed 15 July 2025]

NHS Live Well https://www.nhs.uk/live-well/exercise/ [accessed 15 July 2025]