What is the Mounjaro dose schedule?

Mounjaro uses a 6-step dose escalation: 2.5mg (weeks 1-4), 5mg (weeks 5-8), 7.5mg (weeks 9-12), 10mg (weeks 13-16), 12.5mg (weeks 17-20), and 15mg (week 21 onward). Each dose is injected once weekly. Your doctor may choose a lower maintenance dose depending on your response and tolerability.

Is Mounjaro available in Australia?

Mounjaro (tirzepatide) has been approved by the TGA in Australia. It requires a prescription from a doctor. It is indicated for type 2 diabetes and chronic weight management. Availability and PBS listing status may vary — check with your prescribing doctor or pharmacist.

How is Mounjaro different from Wegovy?

Mounjaro (tirzepatide) is a dual GIP/GLP-1 receptor agonist, while Wegovy (semaglutide) targets only GLP-1 receptors. Clinical trials suggest Mounjaro may produce greater average weight loss (up to 22.5% in the SURMOUNT-1 trial). Both require a prescription and gradual dose escalation.

What are the common side effects of Mounjaro?

The most common side effects are gastrointestinal: nausea, diarrhoea, decreased appetite, vomiting, and constipation. These typically occur during dose escalation and improve over time. The gradual dose increase is designed to minimise these effects. Serious but rare side effects include pancreatitis and gallbladder problems.

Mounjaro Dose Calculator

This calculator maps out the complete Mounjaro (tirzepatide) dose escalation schedule using your treatment start date. Mounjaro is a prescription injection that is gradually increased over 20 weeks to the maximum maintenance dose of 15mg weekly. This tool is for informational purposes only.

Enter Your Details

Treatment Start Date

The date you started or plan to start Mounjaro

How It Works

Mounjaro follows a 6-step dose escalation to reduce side effects. You start at 2.5mg weekly for 4 weeks, then increase every 4 weeks through 5mg, 7.5mg, 10mg, 12.5mg, and finally 15mg. The calculator uses your start date to generate exact dates for each dose change. Your prescribing doctor determines the appropriate maintenance dose, which may be lower than the maximum.

Quick Reference

Phase	Weeks	Dose	Injection	Notes
Escalation 1	1-4	2.5mg	Once weekly	Starting dose
Escalation 2	5-8	5mg	Once weekly	First increase
Escalation 3	9-12	7.5mg	Once weekly	Mid escalation
Escalation 4	13-16	10mg	Once weekly	Higher dose
Escalation 5	17-20	12.5mg	Once weekly	Near maintenance
Maintenance	21+	15mg	Once weekly	Maximum dose

Mounjaro (tirzepatide) is a dual GIP/GLP-1 receptor agonist. Your doctor may choose a lower maintenance dose (e.g. 5mg, 10mg) depending on your response.

Frequently Asked Questions

What is the Mounjaro dose schedule?: Mounjaro uses a 6-step dose escalation: 2.5mg (weeks 1-4), 5mg (weeks 5-8), 7.5mg (weeks 9-12), 10mg (weeks 13-16), 12.5mg (weeks 17-20), and 15mg (week 21 onward). Each dose is injected once weekly. Your doctor may choose a lower maintenance dose depending on your response and tolerability.
Is Mounjaro available in Australia?: Mounjaro (tirzepatide) has been approved by the TGA in Australia. It requires a prescription from a doctor. It is indicated for type 2 diabetes and chronic weight management. Availability and PBS listing status may vary — check with your prescribing doctor or pharmacist.
How is Mounjaro different from Wegovy?: Mounjaro (tirzepatide) is a dual GIP/GLP-1 receptor agonist, while Wegovy (semaglutide) targets only GLP-1 receptors. Clinical trials suggest Mounjaro may produce greater average weight loss (up to 22.5% in the SURMOUNT-1 trial). Both require a prescription and gradual dose escalation.
What are the common side effects of Mounjaro?: The most common side effects are gastrointestinal: nausea, diarrhoea, decreased appetite, vomiting, and constipation. These typically occur during dose escalation and improve over time. The gradual dose increase is designed to minimise these effects. Serious but rare side effects include pancreatitis and gallbladder problems.

Dose Escalation Schedule

Weeks 1-4: 2.5mg → Weeks 5-8: 5mg → Weeks 9-12: 7.5mg → Weeks 13-16: 10mg → Weeks 17-20: 12.5mg → Week 21+: 15mg

4 weeks: = duration at each escalation step
2.5mg: = starting dose to minimise GI side effects
15mg: = maximum maintenance dose
20 weeks: = total escalation period before maintenance

The maximum maintenance dose is 15mg but your doctor may determine a lower maintenance dose is appropriate. Do not adjust doses without medical supervision.

Related Tools

Wegovy Dose Calculator

Understand the Wegovy (semaglutide) dose escalation schedule. See your current dose, next step-up date, and expected timeline.

Weight Loss Calculator

Calculate how long it will take to reach your goal weight. See weekly milestones and the daily calorie target needed.

BMI Calculator

Calculate your Body Mass Index using metric measurements (kg and cm) to check if your weight is in a healthy range.

Disclaimer

This calculator provides estimates for informational purposes only and should not be considered medical advice. Individual results may vary based on factors not captured by these formulas. Consult a healthcare professional before making changes to your diet or exercise routine, especially if you have any existing health conditions.