You’ve decided to explore weight-loss injections. Then comes the confusing part.
Wegovy or Mounjaro? Which dose? How quickly does it increase? And does a higher number mean better weight loss?
Not quite.
Wegovy and Mounjaro contain different medicines, different dose strengths and different escalation schedules. They are not interchangeable. A 2.4 mg dose of Wegovy is not equivalent to a 2.4 mg dose of Mounjaro.
This guide explains wegovy v mounjaro doses in plain English. It covers starting doses, maintenance doses, dose increases and the questions people often ask before treatment.
The information focuses on the weekly injections used for weight management. Always follow your own prescription and the instructions supplied with your medicine.
Wegovy v Mounjaro Doses: The Quick Answer
Wegovy contains semaglutide. Mounjaro contains tirzepatide. Both are prescription medicines used alongside diet and physical activity, but they work differently.
Wegovy is a GLP-1 receptor agonist. Mounjaro activates both GIP and GLP-1 receptors.
Here is the basic comparison.
| Dose stage | Wegovy | Mounjaro |
|---|---|---|
| Starting dose | 0.25 mg once weekly | 2.5 mg once weekly |
| Next usual step | 0.5 mg once weekly | 5 mg once weekly |
| Further escalation | 1 mg, then 1.7 mg | 7.5 mg, 10 mg, 12.5 mg |
| Usual maintenance dose | 2.4 mg once weekly | 5 mg, 10 mg or 15 mg once weekly |
| Maximum adult dose | 2.4 mg once weekly | 15 mg once weekly |
These are the standard adult injection schedules. Your clinician may adjust the pace or choose a different maintenance dose depending on your response and tolerability.
The big takeaway: Mounjaro starts at a higher numerical dose, but that does not mean it is automatically stronger in a simple milligram-for-milligram comparison.
A Story Most Patients Recognise
Imagine two people starting treatment.
One begins Wegovy. The first month is 0.25 mg once a week. The next month, the dose usually rises to 0.5 mg. Then 1 mg. Then 1.7 mg. Eventually, the usual recommended maintenance dose is 2.4 mg once weekly.
The other begins Mounjaro. Their first month is 2.5 mg once a week. After four weeks, the usual next step is 5 mg. If more treatment is needed and the medicine is tolerated, the dose can increase in 2.5 mg steps.
Both are gradual journeys. Neither is a race.
The reason for this slow increase is important. These medicines can cause gastrointestinal side effects, including nausea, vomiting and diarrhoea. Gradual escalation helps reduce the risk of these reactions.
So, if someone says, “I’m only on the starting dose,” that does not mean their treatment has failed. They may simply be at the beginning.
Wegovy Doses Explained
Wegovy is the brand name for semaglutide when used for weight management. It is given as a once-weekly injection. The standard adult schedule begins low and increases over several months.
Wegovy Dose Schedule
| Treatment period | Usual weekly dose |
|---|---|
| Weeks 1–4 | 0.25 mg |
| Weeks 5–8 | 0.5 mg |
| Weeks 9–12 | 1 mg |
| Weeks 13–16 | 1.7 mg |
| Week 17 onwards | 1.7 mg or 2.4 mg |
The usual recommended maintenance dose for adults is 2.4 mg once weekly. However, 1.7 mg once weekly is also an approved maintenance option for adults, depending on treatment response and tolerability.
Why Does Wegovy Start at 0.25 mg?
The starting dose is not intended to deliver the full weight-management effect immediately. It is an initiation dose.
The aim is to help your body adjust to the medicine before moving towards a maintenance dose. If a patient does not tolerate a dose during escalation, the prescribing information allows for delaying escalation.
So, if someone says, “I’m only on 0.25 mg,” that does not mean their treatment has failed. They may simply be at the beginning.
Mounjaro Doses Explained
Mounjaro contains tirzepatide. It is a once-weekly injection used for type 2 diabetes and, in appropriate patients, weight management. It activates both GIP and GLP-1 receptors.
Mounjaro Dose Schedule
| Treatment period | Usual weekly dose |
|---|---|
| Weeks 1–4 | 2.5 mg |
| Weeks 5–8 | 5 mg |
| Further escalation | 7.5 mg, 10 mg, 12.5 mg or 15 mg |
The standard adult starting dose is 2.5 mg once weekly. After four weeks, it is increased to 5 mg once weekly. If additional treatment is needed, the dose may be increased in 2.5 mg increments after at least four weeks on the current dose.
The maximum adult dose is 15 mg once weekly. But reaching 15 mg is not a requirement. Some people remain on a lower maintenance dose if it is effective and well tolerated.
Why Are the Numbers So Different?
This is where many comparisons go wrong.
Wegovy and Mounjaro contain different active ingredients. Their milligram strengths are not designed to be compared directly.
For example:
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Wegovy 0.25 mg is a semaglutide dose.
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Mounjaro 2.5 mg is a tirzepatide dose.
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Wegovy 2.4 mg is not the same as Mounjaro 2.4 mg.
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Mounjaro 15 mg is not “six times stronger” than Wegovy 2.4 mg.
The medicines have different pharmacology, different dose ranges and different clinical evidence. A higher milligram figure does not automatically mean a stronger medicine.
There is no direct milligram-for-milligram conversion between Wegovy and Mounjaro.
Which Has the Higher Maintenance Dose?
Mounjaro has the higher numerical maximum dose. Its maximum adult dose is 15 mg once weekly.
Wegovy’s usual recommended maintenance dose is 2.4 mg once weekly, with 1.7 mg also an approved maintenance option for adults.
But this does not mean Mounjaro is automatically the right choice for everyone.
The right dose depends on the medicine being used, the person taking it, and how well they tolerate it. Your prescriber may decide that a lower dose is enough. More is not always better.
Can You Switch from Wegovy to Mounjaro?
Sometimes, yes. But switching should be planned with a qualified prescriber.
Do not assume that your current Wegovy dose converts directly into an equivalent Mounjaro dose. The medicines have different active ingredients and different dosing schedules.
A clinician will consider your previous dose, treatment history, side effects and the reason for switching before deciding how to start the new medicine.
The same applies in reverse.
If you are already taking one of these medicines, do not start the other without medical advice. Both are prescription treatments, and the correct schedule matters.
Does a Higher Dose Mean More Weight Loss?
Not necessarily.
The goal of dose escalation is to reach a dose that provides an appropriate treatment response while remaining tolerable. It is not simply to reach the highest possible number.
Wegovy and Mounjaro have both been studied for weight management, but their results cannot be predicted by comparing milligrams. Clinical trials, patient characteristics, treatment duration and adherence all matter.
A person taking a lower maintenance dose may be doing well. Another person may need a higher dose. There is no universal “best dose” for everybody.
What If You Cannot Tolerate the Next Dose?
This is a common concern.
If side effects become difficult during escalation, contact your prescriber. They may recommend staying at the current dose for longer, delaying the next increase, or reviewing whether the treatment is suitable.
Do not increase the dose faster than prescribed. Both medicines use gradual escalation to help reduce gastrointestinal side effects.
And if you experience severe or persistent symptoms, seek medical advice promptly.
Common Side Effects to Know
Both medicines can cause gastrointestinal side effects. These may include:
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Nausea.
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Vomiting.
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Diarrhoea.
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Constipation.
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Abdominal discomfort.
The exact side effects and their frequency can vary. Your prescriber should explain what to expect and when to seek help.
Some people find that eating smaller meals and avoiding foods that trigger symptoms helps. But side effects should not simply be ignored, especially if they are severe or persistent.
Wegovy v Mounjaro Doses: Which One Is Right for You?
There is no single answer.
The decision depends on your medical history, treatment goals, other medicines, side effects, and whether you meet the eligibility criteria for weight management treatment.
In the UK, both medicines are prescription-only. NHS access depends on clinical eligibility and local service arrangements. Wegovy and Mounjaro are not simply products you choose from a shelf. A healthcare professional needs to assess whether treatment is appropriate.
If you are considering private treatment, use a registered pharmacy and make sure the medicine is prescribed for you. The NHS warns that fake weight-loss medicines are sold online.
A Simple Way to Remember the Difference
Think of Wegovy as a semaglutide dose ladder:
0.25 → 0.5 → 1 → 1.7 → 2.4 mg
Think of Mounjaro as a tirzepatide dose ladder:
2.5 → 5 → 7.5 → 10 → 12.5 → 15 mg
The numbers are different. The principle is similar: start low, increase gradually, and find the dose that works for you.
That is the part worth remembering.
Frequently Asked Questions
1. What is the starting dose of Wegovy?
The usual starting dose for adults is 0.25 mg once weekly for four weeks. It is then increased gradually according to the prescribing schedule.
2. What is the starting dose of Mounjaro?
The usual starting dose for adults is 2.5 mg once weekly. After four weeks, the dose is usually increased to 5 mg once weekly.
3. Is Wegovy 2.4 mg the same as Mounjaro 2.4 mg?
No. They contain different active ingredients. Milligram strengths cannot be compared directly.
4. What is the highest dose of Wegovy?
The usual recommended maintenance dose for adults is 2.4 mg once weekly. A 1.7 mg once-weekly maintenance dose is also an approved option for adults.
5. What is the highest dose of Mounjaro?
The maximum adult dose is 15 mg once weekly.
6. Can I increase my dose sooner if I feel well?
Do not increase your dose sooner than prescribed. Both medicines use gradual escalation to help reduce gastrointestinal side effects.
7. Can I switch from Wegovy to Mounjaro?
A switch may be possible, but it should be planned with a prescriber. The correct starting dose depends on your treatment history and individual circumstances.
8. Is Mounjaro stronger because its maximum dose is 15 mg?
Not in a simple milligram-for-milligram sense. Mounjaro and Wegovy contain different medicines, so their dose numbers are not directly comparable.
9. What should I do if I miss a dose?
Follow the instructions supplied with your medicine and contact your pharmacist or prescriber if you are unsure. The missed-dose rules differ between medicines.
10. Can I take Wegovy and Mounjaro together?
Do not combine them unless specifically directed by a qualified healthcare professional. Both are prescription medicines, and combining treatments without medical supervision can be unsafe.
Final Thoughts
The wegovy v mounjaro doses question sounds simple. But it is really about understanding two different medicines.
Wegovy starts at 0.25 mg and usually builds towards 2.4 mg weekly. Mounjaro starts at 2.5 mg and can increase towards 15 mg weekly.
Different numbers. Different medicines. Different dose ladders.
The best dose is not the biggest one. It is the dose your prescriber considers appropriate for your treatment goals and your body’s response.
And that is why a proper consultation matters.
