Mounjaro is not a one-size dose. It comes in six strengths, and you move up through them gradually rather than starting where you finish. Understanding what each dose is for, and how the step-up works, makes the whole treatment far less confusing. This guide explains the full schedule from 2.5mg to 15mg. For the wider picture, see our complete guide to Mounjaro.
Mounjaro comes in six doses: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg. Everyone starts on 2.5mg, which is a starter dose to let your body adjust rather than a full treatment dose, and the dose is stepped up gradually, usually no sooner than every four weeks. Not everyone needs to reach 15mg; your prescriber tailors the pace and the dose you settle on to you.
The six Mounjaro doses
Each strength has a role. The lower doses are mainly about easing your body onto the medicine, while the higher ones are the working doses that drive the results seen in the trials.
For the monthly cost of each strength, see our Mounjaro cost breakdown. The dose you are on, not the number of pens, is what sets the price.
How titration works
Moving up through the doses is called titration, and it is deliberately slow. You start on 2.5mg and your prescriber increases the dose in steps, usually no sooner than every four weeks, and only when you are ready. The reason is comfort as much as safety: a gradual build-up gives your digestive system time to adapt, which keeps side effects such as nausea to a minimum. Rushing the increases tends to cause more side effects, not faster weight loss.
What the 2.5mg starter dose is really for
The most common misunderstanding is expecting big results on 2.5mg. This starter dose is designed to introduce the medicine gently, not to drive weight loss, so any change in the first month is usually modest. That is completely normal and not a sign the treatment is failing. We explain this in detail in our guides to why the 2.5mg dose is not for weight loss and whether you can stay on 2.5mg.
How long you stay on each dose
There is no fixed timetable that suits everyone. Some people move up every four weeks; others hold at a dose for longer because it is working well or because they want side effects to settle first. The aim is to reach the lowest dose that gives you a good result with side effects you can live with, which is often called your effective or maintenance dose. Many people settle comfortably before the top of the range.
Do you have to reach 15mg?
No. 15mg is the maximum, not a target everyone must hit. Plenty of people do very well on 5mg, 7.5mg or 10mg and stay there. Going higher is only worthwhile if you need more effect and are tolerating the current dose well, and that is a judgement your prescriber makes with you. A higher number is not automatically better for you as an individual.
Stepping up and missed doses
If a dose increase brings on side effects, the usual answer is to hold at your current dose for a while longer rather than push on, and that is something to raise with your prescriber rather than manage alone. If you miss a weekly dose, take it as soon as you can if it is within a few days of the missed day, otherwise skip it and take the next one as normal. Never take two to catch up. Our guide to how long Mounjaro stays in your system covers the timing in more detail.
Frequently asked questions
What are the Mounjaro doses?
There are six: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg. You start on 2.5mg and move up gradually under your prescriber’s guidance.
Do I have to reach the 15mg dose?
No. 15mg is the maximum, not a target. Many people do well and settle on a lower dose such as 5mg, 7.5mg or 10mg. Your prescriber helps you find the dose that suits you.
How often does the Mounjaro dose increase?
Usually no sooner than every four weeks, and only when you are ready. Some people hold at a dose for longer if it is working well or to let side effects settle first.
Why is the 2.5mg dose so low?
It is a starter dose meant to ease your body onto the medicine rather than to drive weight loss, so a modest first month is normal. The working doses begin at 5mg and above.
Can I increase my dose faster?
It is not advisable. Moving up too quickly tends to cause more side effects rather than faster results. Any change to the pace should be a decision made with your prescriber.
What if side effects hit when I step up?
Tell your prescriber. Often the answer is to hold at your current dose a little longer before increasing again. Side effects after a step-up usually settle within a couple of weeks.
Is a higher Mounjaro dose more effective?
On average the higher doses produce larger results, but the best dose for you is the one that gives a good result with side effects you can manage. That is not always the maximum.
This guide is general information and not a substitute for personal medical advice. Your dose and titration schedule are decided by your prescriber. Mounjaro (tirzepatide) is a prescription-only medicine supplied after an online assessment and approval by a UK-registered independent prescriber.