Mounjaro FAQ: Answers to Common Questions

Got questions about Mounjaro? Here are answers to the most common questions New Zealanders are asking about this weight loss medication.

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General Questions

What is Mounjaro?

Mounjaro is the brand name for tirzepatide, a prescription medication manufactured by Eli Lilly. It's a once-weekly injection approved for chronic weight management and type 2 diabetes. It works by activating both GLP-1 and GIP receptors, making it the first dual-action medication of its kind.

Is Mounjaro available in New Zealand?

Mounjaro received Medsafe approval on 22 December 2025. Commercial availability is expected in 2026, though an exact launch date hasn't been announced.

Is Mounjaro funded by Pharmac?

No. Mounjaro is expected to be a private-pay medication only, similar to Wegovy. There's no current indication that Pharmac will fund it for weight loss.

How much will Mounjaro cost in NZ?

Based on Australian pricing, expect approximately $350-400/month for starting doses, increasing to $700-800/month at the maximum 15mg maintenance dose.

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Effectiveness Questions

How much weight can I lose on Mounjaro?

Clinical trials show an average weight loss of 20-22.5% of body weight at the maximum dose over 72 weeks. For someone starting at 100kg, that's approximately 20-22.5kg. Individual results vary.

Is Mounjaro better than Wegovy?

Head-to-head trials show Mounjaro produces approximately 50% more weight loss than Wegovy on average (20.2% vs 13.7%). However, "better" depends on individual factors including response, tolerance, availability, and cost.

How quickly will I see results?

The first 4 weeks on the starter dose typically show minimal results. Most people start noticing weight loss from week 5 onwards when they reach therapeutic doses. Significant results are usually seen by 3-6 months.

Does Mounjaro work without diet and exercise?

Yes, Mounjaro produces significant weight loss even without lifestyle changes. However, combining it with healthy eating and regular physical activity typically improves results.

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Side Effects Questions

What are the most common side effects?

Gastrointestinal effects are most common: nausea (18%), diarrhoea (17%), decreased appetite (11%), vomiting (9%), and constipation (7%). These usually improve over time.

Are Mounjaro's side effects worse than Wegovy's?

No. Clinical trials show no significant difference in side effect rates between the two medications.

What are sulfur burps and how do I stop them?

Sulfur burps (burps with a rotten egg smell) are a common complaint with GLP-1 medications. To reduce them: avoid carbonated drinks, limit high-sulfur foods, eat slowly, and consider over-the-counter antacids.

Is Mounjaro safe long-term?

Clinical trials extending to 72+ weeks show a consistent safety profile. However, as a newer medication, very long-term data (10+ years) isn't yet available.

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Eligibility Questions

Who can take Mounjaro?

Adults with a BMI of 30+ (obesity) or BMI of 27+ (overweight) with at least one weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea.

Who should NOT take Mounjaro?

People with a personal or family history of medullary thyroid carcinoma, MEN 2 syndrome, or allergy to tirzepatide. It's also not recommended during pregnancy or breastfeeding.

Can I take Mounjaro if I don't have diabetes?

Yes. Mounjaro is approved for chronic weight management regardless of diabetes status.

Can I take Mounjaro with other medications?

Many medications can be taken with Mounjaro, but some require monitoring or adjustment. Always tell your prescriber about all medications you're taking, especially diabetes medications and oral contraceptives.

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Practical Questions

How do I take Mounjaro?

Mounjaro is injected once weekly under the skin (abdomen, thigh, or upper arm) using a pre-filled KwikPen. You can take it with or without food, at any time of day.

What if I miss a dose?

If within 4 days of your scheduled dose, take it as soon as you remember. If more than 4 days have passed, skip the missed dose and take your next dose on your regular day.

How do I store Mounjaro?

Before first use, store in the refrigerator (2-8°C). After first use, it can be kept at room temperature (up to 30°C) for up to 21 days. Don't freeze.

How long will I need to take Mounjaro?

Weight loss medications typically need to be continued to maintain results. If you stop taking Mounjaro, weight regain is likely. Discuss long-term plans with your prescriber.

Can I drink alcohol on Mounjaro?

Moderate alcohol consumption is generally acceptable, but alcohol may worsen gastrointestinal side effects and provide empty calories that work against your weight loss goals.

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Still Have Questions?

At Well Revolution, our care team is available seven days a week to answer your questions about weight loss treatment. Start a free consultation to discuss whether Mounjaro might be right for you.

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References

• Medsafe - Mounjaro Data Sheet