Mounjaro Dosing Schedule: How It’s Started and Increased
- Cole Rudolph
- Mar 25
- 3 min read
If you’re starting Mounjaro, you may be wondering:
“What dose do I start on — and how does it increase?”
👉 Mounjaro (tirzepatide) is started at a low dose and gradually increased over time to improve tolerability and reduce side effects.
Here’s how the dosing schedule typically works.
Key facts about Mounjaro dosing
Treatment starts at a low dose
Doses are increased gradually
Each dose is usually taken for at least 4 weeks
The goal is to find a dose that is effective and well tolerated
Not everyone needs to reach the highest dose
What dose do you start on?
Mounjaro is usually started at:
2.5 mg once weekly
This is a starting dose used to help your body adjust.
It is not intended for full treatment effect.
How the dose is increased
Doses are typically increased gradually over time.
A typical approach is:
2.5 mg once weekly (starting dose)
5 mg once weekly (common ongoing dose)
Some patients may increase further if needed:
7.5 mg once weekly
10 mg once weekly
12.5 mg once weekly
15 mg once weekly
Each dose is usually maintained for at least 4 weeks before any increase.
Many patients remain on 5 mg once weekly, depending on their response and tolerability.
What if you’re switching from another medication?
If you’re switching from another GLP-1 medication (such as Wegovy), your starting dose may be different.
Your doctor may:
Start at a higher dose (such as 5 mg)
Adjust the schedule based on your current treatment
Modify dosing depending on how you’ve tolerated previous medication
👉 This is individual and depends on your treatment history.
Why dosing is increased slowly
Gradual dose increases help:
Reduce side effects
Improve tolerability
Allow your body to adjust
Increasing too quickly can lead to more side effects.
Do you need to reach the highest dose?
No.
While 5 mg, 10 mg, and 15 mg are considered maintenance doses, not everyone needs to increase to the highest level.
Some patients:
Do well on 5 mg
Achieve good results without further increases
Prefer to stay at a dose that feels manageable
Others may benefit from increasing to 10 mg or 15 mg over time.
The right dose depends on your response, goals, and tolerability.
What happens if you have side effects?
If side effects occur, your doctor may:
Delay increasing the dose
Reduce the dose
Keep you at your current dose longer
Dosing can be adjusted based on how you respond.
What happens after you reach your dose?
Once a suitable dose is reached:
Treatment continues at that dose
Regular follow-up is recommended
Progress and side effects are monitored
This helps ensure treatment remains safe and effective.
What this means in New Zealand
In New Zealand, dosing is guided by your doctor and adjusted over time.
Ongoing follow-up allows for:
Safe dose increases
Monitoring of side effects
Personalised adjustments
👉 This helps optimise both results and tolerability.
How quickly does the dose increase?
Most patients stay on each dose for at least 4 weeks before increasing
Each pen is designed to last 4 weeks (one weekly dose)
Dose changes happen gradually over time
Adjustments are based on your response and tolerability
This gradual approach helps improve tolerability and long-term outcomes.
Is Mounjaro right for you?
Mounjaro may be a good option if:
You are in the overweight or obesity BMI range
You’ve struggled to lose weight despite diet and exercise
You’re looking for a medically supported approach
The best way to find out is to speak with a doctor.
If you’re unsure where to start, a simple eligibility check is often the easiest first step.
