When you start Mounjaro, you may wonder how long you'll actually need to take it for.
Is it something you use for a few months and then stop?
Or could treatment continue for longer?
The answer depends on how you respond to treatment, your individual circumstances and the advice of your prescriber.
Mounjaro is licensed for weight management, including weight loss and weight maintenance, alongside a reduced-calorie diet and increased physical activity.
This means treatment isn't necessarily just about losing weight. Maintaining the weight you've lost is also part of weight management.
Is Mounjaro a long-term treatment?
It can be.
Mounjaro is indicated for weight management, including weight loss and weight maintenance. This means treatment isn't necessarily intended to stop as soon as you've lost a certain amount of weight.
For some people, continuing treatment may form part of a longer-term approach to managing their weight.
Your prescriber should review whether treatment continues to be appropriate based on your individual response and circumstances.
There isn't a universal point at which everyone should stop taking Mounjaro.
How long does it take to lose weight with Mounjaro?
Everyone responds differently.
Mounjaro is started at a low dose and increased gradually. The starting dose is 2.5mg once weekly, followed by an increase to 5mg after four weeks. Further increases can be made in a 2.5mg manner after at least four weeks on the current dose, where appropriate.
This means weight loss should be viewed over months rather than expecting a particular result within the first few weeks.
Clinical trials have followed people taking tirzepatide for much longer than the initial dose-escalation period, allowing weight loss and weight maintenance to be assessed over time.
What happens once you've reached your target weight?
Reaching a weight you're happy with doesn't necessarily mean that your treatment has to stop immediately.
Weight management also includes maintaining weight loss, and this is part of Mounjaro's licensed indication.
Your prescriber can assess whether continuing treatment is appropriate for you.
This is important because your appetite and body weight can change again if treatment is stopped.
What happens if you stop taking Mounjaro?
Stopping treatment can result in some of the weight lost during treatment being regained.
This has been observed in clinical research.
In the SURMOUNT-4 study, people who had completed an initial 36-week period of tirzepatide treatment were either continued on tirzepatide or switched to placebo. Those who continued tirzepatide maintained and further increased their weight loss, while those who switched to placebo experienced substantial weight regain during the following 52-weeks.
This doesn't mean that everyone will regain the same amount of weight after stopping.
It does show why maintaining weight loss can be an ongoing part of weight management rather than simply reaching a target and ending treatment.
Does everyone regain weight after stopping Mounjaro?
Weight regain after stopping treatment can happen, but the amount varies between individuals.
There isn't a reliable way to predict exactly how much weight a particular person will regain.
NICE's evidence review also recognised uncertainty around the speed and extent of weight regain after stopping tirzepatide.
Because of this, deciding when to stop treatment requires consultation with your prescriber, rather than relying solely on hitting a specific target weight.
Can you stop Mounjaro once you've lost enough weight?
You shouldn't decide this based on the number on the scale alone.
Your prescriber may consider factors such as:
- how much weight you've lost
- whether your weight has stabilised
- how well you are tolerating treatment
- whether you continue to benefit from treatment
- your other health conditions
- your current medicines
- your eating and physical activity habits
For weight management, the Mounjaro prescribing information (Summary of Product Characteristics) states that if a patient has been unable to lose at least 5% of their initial body weight six months after titrating to the highest tolerated dose, a decision should be made about whether to continue treatment, taking the individual benefit-risk profile into account.
This is different from saying that everyone who loses 5% or more of their initial body weight should stop treatment.
Can you take Mounjaro for years?
There is no general rule in the Mounjaro prescribing information that says treatment must stop after a particular number of months or years.
Clinical studies have investigated tirzepatide over extended periods, including studies assessing continued treatment and weight maintenance.
Whether an individual should continue treatment should be based on clinical decision.
Your prescriber will regularly review whether Mounjaro remains appropriate for you and whether the benefits continue to outweigh the risks.
Is stopping Mounjaro safe?
Some people may stop Mounjaro as part of a planned treatment decision, but you should discuss stopping your treatment with your prescriber first.
If you develop severe, persistent abdominal pain, which may spread to your back and may occur with or without nausea and vomiting, stop Mounjaro and seek urgent medical help. This may be acute pancreatitis. Do not wait for a routine prescriber review. If pancreatitis is confirmed, Mounjaro must not be restarted.
Otherwise, whether and when to stop should be assessed and considered in your case as part of your overall treatment plan.
Don't change your dose or stop treatment simply because you've reached a particular number on the scale.
What can you do to maintain your weight?
Whether you continue Mounjaro or eventually stop treatment, healthy habits remain an important aspect of your journey.
This includes:
- eating a healthy balanced diet
- maintaining regular meals habit
- staying physically active
- including strength-based activity where appropriate
- monitoring changes in your weight
- seeking support if your weight begins to increase again
You can read more about nutrition and physical activity in our other guides: What Can You Eat While Taking Mounjaro? and Mounjaro and Exercise: How to Stay Active During Weight Loss.
The takeaway
Mounjaro isn't necessarily a short-term treatment.
It is licensed for weight management, including both weight loss and weight maintenance, alongside a reduced-calorie diet and increased physical activity.
Some people may eventually stop treatment, while others may continue treatment as part of longer-term weight management.
The right approach depends on your individual circumstances and should be reviewed with your prescriber.
If you're thinking about stopping Mounjaro, speak to your prescriber before making changes to your treatment plan.
Frequently asked questions
How long should I use Mounjaro for weight loss?
There isn't one fixed treatment duration for everyone. Your prescriber should review your response to treatment, how well you tolerate it and whether you continue to benefit from it.
Do I have to stop Mounjaro once I reach my target weight?
Not necessarily. Mounjaro is licensed for weight management, including weight maintenance, so reaching a target weight doesn't automatically mean treatment should stop.
Will I regain weight if I stop Mounjaro?
Some weight regain can occur after stopping treatment. Clinical studies have shown substantial weight regain in people who stopped tirzepatide after an initial treatment period, although individual results vary.
Can I use Mounjaro long term?
Mounjaro can be used as part of long-term weight management when continued treatment is considered appropriate. Your prescriber should regularly review your treatment.
What happens if Mounjaro stops working?
If you're not achieving the expected benefit from treatment, speak to your prescriber. The Mounjaro prescribing information says that if less than 5% of initial body weight has been lost six months after titrating to the highest tolerated dose, the prescriber should decide whether treatment should continue, considering the individual benefits and risks.
Can I stop Mounjaro suddenly?
Discuss planned changes to your treatment with your prescriber. However, if you develop severe, persistent abdominal pain, possibly spreading to your back, with or without nausea and vomiting, stop Mounjaro and seek urgent medical help because this may be pancreatitis. Do not wait for a routine review. Whether treatment should otherwise be stopped depends on your individual circumstances.
Related articles
- What Can You Eat While Taking Mounjaro?
- Mounjaro and Exercise: How to Stay Active During Weight Loss
Considering Mounjaro?
If you're considering prescription weight management treatment, GENMEDS offers an online consultation where a prescriber can assess whether treatment is appropriate for you. If prescribed, Mounjaro should be used alongside a reduced-calorie diet and increased physical activity.
