Mounjaro Dosage Guide: Starting and Titration Explained
- Cole Rudolph
- May 25
- 5 min read
Starting a new prescription medication raises a lot of questions — and with Mounjaro (tirzepatide), one of the most common is: What dose do I start on, and how does it change over time?
Understanding the dosing schedule isn't just useful for managing expectations. It also helps you recognise what's normal during the early weeks, why your GP prescribes the doses they do, and how the gradual escalation approach keeps treatment as safe and comfortable as possible.
This guide explains Mounjaro dosing from a clinical perspective, in plain language, so you can approach your treatment with confidence.
How Mounjaro Is Dosed
Mounjaro is a once-weekly subcutaneous injection. This means it is injected under the skin — not into muscle or a vein — once every seven days, ideally on the same day each week.
The medication comes in a pre-filled auto-injector pen, which makes self-administration at home straightforward for most people. If you're new to self-injection, our guide on how to inject Mounjaro safely covers the full step-by-step technique.
The Standard Dosing Schedule
Tirzepatide follows a structured dose escalation protocol. This staged approach is not about keeping doses low forever — it's about allowing your body to adjust gradually and minimising common side effects like nausea and gastrointestinal discomfort.
The standard titration schedule follows a series of titrating and maintenance doses. We organise these doses into 3 distinct tiers for weight management as follows.
All patients who are new or are restarting Mounjaro will start in Tier 1. Doctors can help advise when it is right for you to stay at a particular dose or escalate depending on your progress, tolerance, and goals. Most patients will find they can achieve their desired result in Tier 1, maintaining at Mounjaro 5mg.
Tier 1 | ||
Phase | Dose | Duration |
Starting Dose | 2.5 mg once weekly | 4 weeks |
Maintenance | 5 mg once weekly | Ongoing |
Tier 2 | ||
Starting Dose | 7.5 mg once weekly | 4 weeks |
Maintenance | 10 mg once weekly | Ongoing |
Tier 3 | ||
Starting Dose | 12.5 mg once weekly | 4 weeks |
Maintenance | 15 mg once weekly | Ongoing |
The 2.5 mg starting dose is an introductory dose. It is not expected to produce significant appetite suppression or weight loss on its own. Its purpose is to prepare your body for higher doses.
Most patients notice a meaningful reduction in appetite and food cravings once they reach the 5 mg, and are able to reach their weight goals at this dose.
Why Dose Escalation Matters
Rushing the titration process is one of the most common causes of avoidable side effects with tirzepatide. The escalation protocol exists for good reason.
When you start at a low dose and increase every four weeks, your digestive system adapts progressively. This significantly reduces the likelihood of nausea, vomiting, and GI discomfort that can occur when the dose increases too quickly.
Think of it as a calibration period. Your body is learning how to respond to a new hormonal signal, and giving it time makes the process more comfortable and more sustainable.
What If Side Effects Are Troublesome at a Given Dose?
Not everyone moves through the titration schedule at exactly the same pace. If you experience persistent nausea, vomiting, or significant gastrointestinal side effects at a particular dose, your GP may recommend:
Extending the time at the current dose — staying at, say, 2.5 mg for an additional four weeks before moving to 5 mg
Dietary adjustments — eating smaller, lower-fat meals around injection time
Reviewing timing — some patients tolerate injections better in the morning or evening
What your GP will generally not recommend is skipping doses or stopping abruptly without a plan. If side effects are significant, speak with your doctor before making any changes to your schedule. You can access unlimited GP support easily as a part of Pocket Lab’s Weight Loss Care Plan.
The Maintenance Dose
For most people treated with Mounjaro for weight management, the target maintenance dose is 5 mg once weekly.
However, the maintenance dose is individual. Some patients achieve their goals at lower doses and, in consultation with their GP, may require up to 10 mg or 12.5 mg if tolerability is good.
There is no clinical benefit to increasing the dose beyond 15 mg — this is the approved ceiling for tirzepatide.
Mounjaro Dosage for Type 2 Diabetes vs Weight Loss
It's worth noting that Mounjaro is approved in New Zealand for both type 2 diabetes management and chronic weight management. The dosing approach is similar for both indications, beginning at 2.5 mg and titrating upward.
For people using Mounjaro primarily for blood sugar control in type 2 diabetes, the treating dose may differ slightly from those using it purely for weight management. Your prescribing GP will tailor the dosing plan to your individual clinical situation.
What Happens If You Miss a Dose?
Missing the occasional weekly dose doesn't mean you need to restart. General guidance is:
If fewer than 4 days have passed since your missed dose, take it as soon as you remember, then resume your regular weekly schedule
If 4 or more days have passed, skip the missed dose and take your next dose on the originally scheduled day
Never take two doses in the same week to make up for a missed one. If you're unsure, your Pocket Lab GP can advise you directly.
How Long Does It Take to See Results?
Appetite changes typically begin to appear within the first one to two weeks, even at the starting 2.5 mg dose. Measurable weight loss usually becomes more consistent from weeks four to twelve, as the dose increases and the medication's effects build.
For a detailed breakdown of realistic timelines, see our article on how long it takes Mounjaro to work.
The Role of Your GP in Dose Management
Mounjaro is a prescription medication in New Zealand. Your dose should always be managed by a registered GP who knows your full medical history.
At Pocket Lab, our doctors conduct monthly check-ins as standard. These aren't just tick-box appointments — they're an opportunity to review how you're tolerating the current dose, assess progress, and adjust the titration plan if needed.
Dose escalation is never automatic. Your GP weighs your side-effect profile, weight loss progress, and overall health before recommending the next step.
Getting Started with Mounjaro in NZ
If you haven't yet begun treatment and are wondering whether Mounjaro is right for you, the starting point is a medical assessment. You'll need to meet eligibility criteria (typically a BMI of 30 or above, or 27+ with a weight-related health condition), and your GP will confirm whether tirzepatide is appropriate based on your full history.
Find out more about how to get a Mounjaro prescription in New Zealand, or explore Pocket Lab's full weight loss treatment programme including both Mounjaro and Wegovy options.
Summary
Mounjaro is taken once weekly as a subcutaneous injection
Treatment starts at 2.5 mg and titrates up to a maximum of 15 mg weekly
Most patients will successfully reach their goals at a maintenance of 5mg weekly
Gradual dose escalation is deliberate — it reduces side effects and improves tolerability
Your GP may slow the escalation if side effects arise at any stage
The maintenance dose is individual and should be determined with your doctor
Regular GP review is an essential part of safe dose management
Mounjaro is available in New Zealand through Pocket Lab. Take a FREE eligibility quiz to see if you qualify.
This article is for informational purposes only and does not replace personalised medical advice. Always consult a registered New Zealand GP before starting or adjusting any prescription medication.
