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Weight loss injection
Mounjaro
Mounjaro is a weekly injection pen that acts on two hormones (GLP-1 and GIP) to support weight loss.
- Self-inject once a week
- Up to 22.5% average weight loss in studies*
- Ongoing support at every step of treatment
Available doses
NZ$239NZ$294
Price with Subscribe & Save
*SURMOUNT-1, a 72-week study in adults with obesity using tirzepatide 15mg. Individual results may vary. Indicative starting dose for reference; your doctor determines the right dose.
About Mounjaro
What is Mounjaro and how does it work?
Mounjaro (tirzepatide) comes in a pre-filled pen with four fixed weekly doses. It activates both GIP and GLP-1 receptors — a dual action that slows stomach emptying, reduces appetite and stabilises blood sugar. It works best alongside healthy eating, exercise and ongoing medical support.
How Mounjaro works
By mimicking two gut hormones, Mounjaro reduces hunger between meals and 'food noise', while smaller meals bring more fullness.
How long before it works?
Mounjaro works from the first dose. Most people notice reduced appetite within a week; visible weight change usually becomes clear around month three.
What results can you expect?
In the head-to-head SURMOUNT-5 study, participants on the maximum tolerated tirzepatide dose lost an average of 20.2% of their body weight versus 13.7% with semaglutide.
In short
Mounjaro summary
| Detail | Information |
|---|---|
| Active ingredient | Tirzepatide |
| Form | Weekly injection pen |
| Manufacturer | Eli Lilly |
| Price | NZ$239–NZ$590 per pen |
| Availability | In stock |
| Strengths | 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg |
| Review | Our doctors assess whether the treatment is suitable and monitor your progress. They adjust your dose if needed. |
| Support | Medical team available throughout your journey |
| Monitoring | Regular check-ins with our medical team during treatment |
Real Mounjaro results from our patients
People come to us for different reasons, but most are looking for a safe, guided way to manage their weight.
22.5%
body weight lost (in studies)*
9 in 10
reported health improvements
7 in 10
reported greater confidence
*Based on clinical study results and patient-reported outcomes. Individual results may vary.
How to get Mounjaro
The first steps toward feeling healthier.
Complete a simple questionnaire
Answer questions about your health, lifestyle and goals.
Your request is reviewed by a doctor
An NZ-registered doctor carefully reviews your request to check the treatment is safe and suitable for you.
Receive discreet delivery
Your medication is prepared by our registered pharmacy and discreetly packaged for delivery to your door.
Stay supported
Schedule check-ins with our specialist team to track your progress and support you throughout your journey.
Understanding side effects
Most side effects relate to digestion and occur early in treatment or after a dose increase. For most people they're mild to moderate and ease within the first 20 weeks.
Digestive issues
Nausea, diarrhoea, vomiting, constipation, indigestion, bloating and burping are the most common effects, usually strongest in the first few weeks and after each dose increase.
Other common side effects
Dizziness, low blood pressure, tiredness, injection site reactions, rash and temporary hair loss (more related to rapid weight loss than the medicine itself).
Dehydration
Persistent nausea, vomiting or diarrhoea can lead to dehydration, which can affect kidney function. Drink fluids regularly and tell your doctor if symptoms are severe or ongoing.
Less common but serious
Gallbladder problems, acute pancreatitis, increased heart rate, altered taste and menstrual changes are uncommon. Seek help immediately for severe abdominal pain with vomiting.
Eligibility
Mounjaro supports weight management alongside healthy eating and regular exercise. A thorough review is the best way to find the right treatment for you.
Is Mounjaro right for me?
- Adults with a BMI of 30 or higher
- Adults with a BMI of 27 or higher plus a weight-related condition such as high blood pressure, high cholesterol, heart disease, prediabetes or sleep apnoea
- Lower BMI thresholds may apply for people of South Asian, Chinese, other Asian, Middle Eastern, Black or African-Caribbean background
- People able to commit to lifestyle changes alongside treatment
Who shouldn't use Mounjaro?
- Under 18 or over 85
- Pregnant or breastfeeding
- Allergic to tirzepatide or any of the pen's ingredients
- Personal or family history of medullary thyroid carcinoma, or MEN2
- Severe kidney or liver problems, pancreatitis, gallstones or severe gastrointestinal conditions
- Currently taking other blood sugar-lowering medicines (discuss this with your doctor first)
Results
What Mounjaro weight loss results can look like. Individual results may vary.
What to expect over time
Most people reach 15–20% weight loss in the first year. Some reach 20–25% over 1.5–2 years at higher doses. Three-year data shows an average maximum loss of around 23%.
SURMOUNT-1 at 72 weeks
- 16.0% average loss at 5mg
- 21.4% average loss at 10mg
- 22.5% average loss at 15mg
Head-to-head comparison
In SURMOUNT-5, tirzepatide led to 20.2% average weight loss compared with 13.7% for semaglutide — about 47% more relative weight loss.
Body composition
About three-quarters of the weight lost is fat mass and a quarter is muscle mass. That's why it's important to preserve muscle mass through regular exercise.
Mounjaro versus Wegovy at a glance
Both are weekly injections prescribed for weight loss. They work in different ways, and the right choice depends on how your body responds, not just the numbers.
| Quick comparison | Mounjaro | Wegovy |
|---|---|---|
| How it works | Dual GIP and GLP-1 receptor agonist | GLP-1 receptor agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Average weight change at 72 weeks* | 20.2% reduction | 13.7% reduction |
| Dosing | Injected once weekly | Injected once weekly |
| Common side effects | Mainly gastrointestinal | Mainly gastrointestinal |
*SURMOUNT-5 directly compared the maximum tolerated doses of tirzepatide and semaglutide, alongside lifestyle support, in adults with obesity without type 2 diabetes. Individual results may vary.
Taking it and dosing
Mounjaro dosage
Treatment starts at 2.5mg per week and is gradually increased every 4 weeks until you reach the dose that works best for you. Not everyone needs the highest dose.
| Weeks | Dose | Notes |
|---|---|---|
| Weeks 1–4 | 2.5mg | Starting dose |
| Weeks 5–8 | 5mg | Maintenance dose |
| Weeks 9–12 | 7.5mg | Increased dose |
| Weeks 13–16 | 10mg | Maintenance dose |
| Weeks 17–20 | 12.5mg | Increased dose |
| Week 21 onwards | 15mg | Maximum maintenance dose |
Your doctor increases your dose in 2.5mg steps, only when needed, based on how you respond to treatment.
How to use the Mounjaro injection
Use Mounjaro once a week, on the same day if possible, at any time of day.
Missed doses
- Within 4 days of the missed dose — take it as soon as possible
- More than 4 days — skip the missed dose entirely
- Take your next dose on your usual day
- Never take a double dose
Injection sites
- Stomach, at least 5 cm from the belly button
- Thigh
- Upper arm
- Rotate the injection site each week
How to inject
- Wash your hands and check the pen and expiry date
- Attach a new needle and prime the pen
- Dial your prescribed dose and listen for the clicks
- Inject, hold, and dispose of the needle in a sharps container
Support at every step
Your doctor or pharmacist can guide you through using it before you start treatment. Injecting usually gets easier with practice.
Important safety information
Additional monitoring, contraindications, interactions and contraception advice.
Don't use Mounjaro if you
- Are allergic to tirzepatide or any of the pen's ingredients
- Have a personal or family history of medullary thyroid carcinoma
- Have Multiple Endocrine Neoplasia syndrome type 2
- Are pregnant or breastfeeding
Check with your doctor first if you
- Have a history of pancreatitis
- Have a severe gastrointestinal condition
- Have kidney problems
- Have diabetic retinopathy
Contraindications and interactions
- Insulin, sulfonylureas and meglitinides increase the risk of low blood sugar
- Other GLP-1 medicines should not be combined
- Absorption of oral hormone therapy may be reduced — a patch or gel may be more suitable
- Alcohol and some supplements can affect blood sugar and side effects
Mounjaro and contraception
Mounjaro slows stomach emptying, which can reduce absorption of the contraceptive pill. Use a barrier method or a non-oral method for 4 weeks after starting and after each dose increase.
When to seek urgent help
- Severe abdominal pain radiating to the back
- Persistent vomiting
- Severe upper abdominal pain with fever
- Signs of a severe allergic reaction
Not sure how urgent it is?
Call 111 for severe or sudden symptoms. For urgent but non-life-threatening symptoms, contact an after-hours GP clinic or message our medical team.
Storage & travel
Storing your Mounjaro pen
Store unopened pens in the fridge at 2–8°C, in the original packaging, and don't freeze them. Once in use, a pen can be kept below 30°C for up to 30 days.
How we deliver your Mounjaro
Mounjaro is a cold-chain medicine. We ship it in validated temperature-controlled packaging with cool packs that maintain fridge conditions for at least 48 hours.
Can I travel with Mounjaro?
Yes. Use an insulated travel bag with cool packs and a barrier between the cool pack and the pen. Carry it in your hand luggage — the hold can freeze and damage the medicine.
Prescription letters
You may need a letter for airport security. Contact us and your doctor will send a PDF copy to print and carry with you.
Stopping, restarting and switching
Talk to your doctor before changing your treatment. A clear plan gives you the best chance of maintaining your results.
Can you stop suddenly?
Yes — tirzepatide doesn't cause physical withdrawal, so you can stop without tapering. The medicine leaves your body within a few weeks.
What happens after stopping?
Appetite and cravings often return to pre-treatment levels, and some or all of the weight lost can return. How you stop and how consistent your habits are both play a role.
Restarting Mounjaro
- Within 3 weeks — restart at your last dose, or build up further if it was well tolerated
- After more than 3 weeks — you may need to restart at 2.5mg and build up again
Switching to or from Wegovy
- Leave one week between your last Wegovy dose and your first Mounjaro dose, starting at 2.5mg
- Switching to Wegovy also requires a one-week gap; your doctor will advise the starting dose.
Mounjaro alternatives
Mounjaro is one of several prescription weight loss treatments, and it isn't always the right starting point for everyone.
Weight loss injections
- Wegovy — semaglutide, weekly, widely used with strong research data
- Saxenda — liraglutide, daily, a more gradual approach
- Generic liraglutide — the same active ingredient at a lower price
Weight loss pills
- Wegovy pill — prescription-only oral semaglutide
- Foundayo — once-daily oral treatment
- Orlistat — reduces the amount of fat absorbed from food
Mounjaro prices
The price depends on the prescribed strength and generally increases as your dose rises. Each Mounjaro KwikPen holds four doses and lasts four weeks.
| Dose | Stage | Price per pen | Subscribe & Save |
|---|---|---|---|
| 2.5mg | Starting dose | NZ$313.00 | NZ$239.00 |
| 5mg | Building up | NZ$370.00 | NZ$333.00 |
| 7.5mg | Building up | NZ$481.00 | NZ$433.00 |
| 10mg | Building up | NZ$518.00 | NZ$466.00 |
| 12.5mg | Building up | NZ$555.00 | NZ$499.00 |
| 15mg | Maintenance | NZ$592.00 | NZ$533.00 |
Prices are per pen. Subscribe & Save is optional. Your doctor confirms the right dose based on your review.
Mounjaro build-up schedule
Your body needs time to adjust to each dose. This schedule shows when to order your next pen and what to expect over 24 weeks.
2.5mg
2–3 kg
5mg
3–4 kg
7.5mg
4–5 kg
10mg
5–6 kg
12.5mg
6–7 kg
15mg
7–8 kg
Expected weight loss figures are estimates based on clinical data. Individual results depend on diet, exercise and adherence.
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I was reviewed by a doctor before any decision was made. That gives me confidence it's a trustworthy company. It arrived in an insulated box with a cool pack, and my order went smoothly.
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I've lost a significant amount of weight and I'm no longer hungry, so I don't overeat. The guidance along the way has really kept me on track.
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I filled out a thorough questionnaire, uploaded photos and the prescription was sent within the hour. The usage instructions were very detailed.
Our team of specialists
Our clinical team of doctors, pharmacists, dietitians and health coaches supports you at every stage. Join over 1 million patients who trust Miva with their health.
Dr. Lydia Sham Rashid
Head Physician
MD
Dr. Shehna Raghoonanan
Doctor
MB ChB
Abdal Alvi
Chief Clinical Officer
MPharm, IP, MRPharmS
Laura Perez
Head of Clinical Nutrition
BSc (Hons), MSc, MSc
Aamina Rafiq
Responsible Pharmacist
MPharm
Ayisha Mushtaq
Registered Nutritionist
MSc Human Nutrition
Zahra Qureshi
Clinical Pharmacist
MPharm, IP
Richard Wood
Clinical Pharmacist
MPharm, IP
Rebekkah Shaw
Head of Patient Care
BSc (Hons)
Jane Miller
Registered Dietitian
MSc, RD
Frequently asked questions about Mounjaro
Weight loss treatments
Medically reviewed by
Aamina Rafiq
Responsible Pharmacist
This page has been reviewed by our clinical team to ensure the information is clear, accurate and up to date. Last updated: 10 February 2026.
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