Weight loss injection
Mounjaro
Mounjaro is a once-weekly injection pen that targets two hormones (GLP-1 and GIP) for enhanced weight loss results.
- Once-weekly self-injection pen
- Up to 22.5% average body weight loss in studies*
- Ongoing support at every step of treatment
Available doses
$129$159
Subscribe & Save treatment price
*SURMOUNT-1, a 72-week study of adults with obesity using tirzepatide 15mg. Individual results vary. Indicative starting dose for reference; your clinician determines the appropriate 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 — dual action that slows stomach emptying, reduces appetite and steadies blood sugar. It works best alongside healthy eating, activity and ongoing clinical support.
How Mounjaro works
By mimicking two gut hormones, Mounjaro reduces hunger between meals, quietens food noise and makes smaller meals feel more satisfying.
How long does it take to work?
Mounjaro starts working 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 trial, participants on maximum tolerated tirzepatide lost an average of 20.2% of body weight versus 13.7% on semaglutide.
At a glance
Mounjaro summary
| Detail | Information |
|---|---|
| Active ingredient | Tirzepatide |
| Format | Once-weekly injection pen |
| Manufacturer | Eli Lilly |
| Price | $129–$319 per pen |
| Availability | In stock |
| Strengths | 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg |
| Review | Our clinicians review suitability and progress, adjusting your dose as needed |
| Support | Clinical team available throughout your weight loss journey |
| Monitoring | Regular check-ins with our clinical team during treatment |
Real Mounjaro results from our patients
People come to us for different reasons, but most are looking for a safe, supported way to manage their weight.
22.5%
of body weight lost (in studies)*
9 in 10
reported health improvements
7 in 10
reported increased confidence
*Based on clinical study results and patient-reported outcomes. Individual results vary.
How to get Mounjaro
Taking the first steps to feeling healthier overall.
Complete a simple assessment
Answer questions about your health, lifestyle, and goals.
Your assessment is reviewed by a clinician
A Canadian-licensed prescriber carefully reviews your assessment to ensure treatment is safe and suitable for you.
Receive discreet delivery
Your medication is dispensed by our registered pharmacy and delivered to your door in plain packaging.
Stay supported
Schedule reviews with our specialist teams to monitor progress and support you throughout your journey.
Understanding side effects
Most side effects are digestive and appear early in treatment or after a dose increase. For most people they are mild to moderate and settle within the first 20 weeks.
Digestive side effects
Nausea, diarrhoea, vomiting, constipation, indigestion, bloating and burping are the most common effects, usually strongest in the first weeks and after each dose increase.
Other common side effects
Dizziness, low blood pressure, fatigue, injection-site reactions, rash and temporary hair thinning (more closely linked to rapid weight loss than the medicine itself).
Dehydration
Persistent nausea, vomiting or diarrhoea can lead to dehydration, which can affect kidney function. Sip fluids regularly and tell your prescriber if symptoms are severe or prolonged.
Less common but serious
Gallbladder problems, acute pancreatitis, increased heart rate, altered taste and menstrual changes are uncommon. Seek urgent help for severe abdominal pain with vomiting.
Eligibility
Mounjaro supports weight management alongside healthy eating and regular physical activity. A thorough assessment is the best way to find the treatment that suits you.
Is Mounjaro right for me?
- Adults with a BMI of 30 or above
- Adults with a BMI of 27 or above plus a weight-related condition such as high blood pressure, high cholesterol, cardiovascular disease, prediabetes or sleep apnoea
- Lower BMI thresholds may apply for people of South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean heritage
- People able to commit to lifestyle changes alongside treatment
Who should not take Mounjaro?
- Under 18 or over 85
- Pregnant or breastfeeding
- Allergic to tirzepatide or any ingredient in the pen
- Personal or family history of medullary thyroid carcinoma, or MEN2
- Severe kidney or liver problems, pancreatitis, gallstones or severe gastrointestinal disease
- Currently taking other medicines that lower blood sugar (discuss with your prescriber first)
Results
What the weight loss results associated with Mounjaro can look like. Individual results vary.
What to expect over time
Most people achieve 15–20% weight loss in the first year, with some reaching 20–25% over 1.5–2 years on 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 data
In SURMOUNT-5, tirzepatide delivered 20.2% mean weight loss compared with 13.7% for semaglutide — roughly 47% more relative weight loss.
Body composition
Roughly three quarters of the weight lost comes from fat mass and one quarter from lean tissue, so maintaining muscle through regular activity matters.
Mounjaro vs Wegovy at a glance
Both are once-weekly injections prescribed for weight loss. They're effective in different ways, and the right choice depends on how your body responds, not just the headline 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 | Once-weekly injection | Once-weekly injection |
| Common side effects | Mainly gastrointestinal | Mainly gastrointestinal |
*SURMOUNT-5 directly compared maximum tolerated doses of tirzepatide and semaglutide alongside lifestyle support in adults with obesity but without type 2 diabetes. Individual results vary.
How to take and dosage
Mounjaro dosage
Treatment starts at 2.5mg once a week and increases gradually 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 | Step up dose |
| Weeks 13–16 | 10mg | Maintenance dose |
| Weeks 17–20 | 12.5mg | Step up dose |
| Week 21 onwards | 15mg | Maximum maintenance dose |
Your prescriber increases your dose in 2.5mg steps only when needed, guided by how you respond to treatment.
How to use the Mounjaro injection
Use Mounjaro once a week, on the same day each week where 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
- Abdomen, at least 5cm from the navel
- Upper thigh
- Upper arm
- Rotate injection sites each week
How to inject
- Wash your hands and inspect the pen and expiry date
- Attach a new needle and prime the pen
- Set your prescribed dose and listen for the clicks
- Inject, hold, then dispose of the needle in a sharps bin
Support at every step
Your prescriber or pharmacist can walk you through use before treatment starts, and injections usually become easier with practice.
Important safety information
Additional monitoring, contraindications, interactions and contraception guidance.
Do not use Mounjaro if you
- Are allergic to tirzepatide or any ingredient in the pen
- Have a personal or family history of medullary thyroid carcinoma
- Have Multiple Endocrine Neoplasia syndrome type 2
- Are pregnant or breastfeeding
Speak to your prescriber first if you have
- A history of pancreatitis
- Severe gastrointestinal disease
- Kidney problems
- Diabetic retinopathy
Contraindications and interactions
- Insulin, sulfonylureas and meglitinides increase the risk of low blood sugar
- Other GLP-1 medicines should not be combined
- Oral HRT absorption may be reduced — a patch or gel may suit better
- Alcohol and some supplements can affect blood sugar and side effects
Mounjaro and contraception
Mounjaro slows stomach emptying, which can reduce absorption of the oral contraceptive pill. Use a barrier or non-oral method for 4 weeks after starting and after each dose increase.
When to seek urgent help
- Severe stomach pain that spreads to your back
- Persistent vomiting
- Severe upper abdominal pain with fever
- Signs of a serious allergic reaction
Not sure how urgent it is?
Call 911 if symptoms are severe or sudden. For urgent but non-life-threatening symptoms, contact your provincial health line (811 in most provinces) or message our clinical team.
Storage & travel
Storing your Mounjaro pen
Store unopened pens in the fridge at 2–8°C, in the original carton, and do not freeze. 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 in validated temperature-controlled packaging with ice packs that hold fridge-safe 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 pack and the pen. Carry it in hand luggage — the hold can freeze and damage the medicine.
Prescription letters
You may need a prescription letter for airport security. Contact us and your prescriber will email a PDF copy to print and take with you.
Stopping, restarting and switching
Before changing your treatment, speak to your prescriber. A clear plan gives you the best chance of maintaining your results.
Can you stop suddenly?
Yes — tirzepatide does not cause physical withdrawal, so it is possible to stop without tapering. The medicine leaves your system over a few weeks.
What happens after stopping?
Appetite and cravings commonly return toward pre-treatment levels, and some or all of the weight lost can return. How you stop and how consistent your habits are both matter.
Restarting Mounjaro
- Within 3 weeks — restart on your last dose, or step up if it was well tolerated
- After more than 3 weeks — you may need to restart at 2.5mg and re-titrate
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 needs a one-week gap; your prescriber will advise the starting dose
Mounjaro alternatives
Mounjaro is one of several prescription weight loss treatments, and it is not always the right starting point for everyone.
Weight loss injections
- Wegovy — semaglutide, once weekly, widely used with strong trial data
- Saxenda — liraglutide, once daily, a more gradual approach
- Generic liraglutide — the same active ingredient at a lower price point
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
Price depends on the strength prescribed, and typically increases as your dose rises. Each Mounjaro KwikPen contains four doses, lasting four weeks.
| Dose | Stage | Price per pen | Subscribe & Save |
|---|---|---|---|
| 2.5mg | Starter dose | $169.00 | $129.00 |
| 5mg | Titration | $199.99 | $179.99 |
| 7.5mg | Titration | $259.99 | $233.99 |
| 10mg | Titration | $279.99 | $251.99 |
| 12.5mg | Titration | $299.99 | $269.99 |
| 15mg | Maintenance | $319.99 | $287.99 |
Prices are per pen. Subscribe & Save is optional. Your clinician will confirm the appropriate dose based on your assessment.
Mounjaro titration guide
Your body needs time to adjust to each dose. This schedule shows when to order your next pen and what to expect across 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 vary based on diet, activity and adherence.
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Our expert team
Our clinical team of doctors, pharmacists, dietitians and health coaches supports you at every stage. Join over 1,000,000 Canadian patients who trust Miva with their health.
Abdal Alvi
Chief Clinical Officer
MPharm, IP, MRPharmS
Laura Perez
Clinical Nutrition Lead
BSc (Hons), MSc, MSc
Aamina Rafiq
Superintendent Pharmacist
MPharm
Ayisha Mushtaq
Registered Associate Nutritionist
MSc Human Nutrition
Zahra Khan
Clinical Pharmacist
MPharm, IP
Will Brown
Health Coach Lead
BSc (Hons)
Rebekkah Shaw
Patient Care Lead
BSc (Hons)
Jane Miller
Registered Dietitian
MSc, RD
Mounjaro frequently asked questions
Weight loss treatments
Medically reviewed by
Aamina Rafiq
Superintendent Pharmacist
This page has been reviewed by our clinical team to ensure it is clear, accurate and up to date. Last updated: 10 February 2026.
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