Understanding the Mounjaro dosing schedule from the very first injection helps you know what to expect at each stage of treatment.
Follow this Mounjaro dosing schedule to titrate safely from your first injection through to your maintenance dose.
Mounjaro (tirzepatide) is dosed gradually, not at full strength from day one. Here’s how the titration schedule works and why it’s structured this way.
Why dosing starts low
Mounjaro’s most common side effects — nausea, reduced appetite, occasional digestive upset — are most likely when the dose increases. Starting at a low dose and increasing gradually gives your body time to adjust, which significantly reduces how severe these side effects feel.
The typical schedule
| Weeks | Dose |
|---|---|
| 1–4 | 2.5mg (starting dose, not intended for ongoing weight loss effect) |
| 5–8 | 5mg |
| 9–12 | 7.5mg |
| 13–16 | 10mg |
| 17–20 | 12.5mg |
| 21+ | 15mg (maximum dose, if needed and tolerated) |
Not everyone needs to reach the maximum dose — your prescriber may keep you on a lower maintenance dose if it’s already achieving your goals with good tolerability. Doses on this schedule are approximate; always follow your prescriber’s specific instructions.
How to inject Mounjaro
Mounjaro is delivered using a pre-filled, single-use pen. Common injection sites are the abdomen (avoiding a 2-inch area around the navel), the front of the thigh, or the back of the upper arm. It’s generally recommended to rotate between these sites with each injection to reduce the chance of skin irritation at any one spot. The pen is designed to be used once and then disposed of in a sharps container — never in regular household waste.
Storage
Unopened pens are typically stored in a refrigerator. Once a pen is in use, it can usually be kept at room temperature for a limited period — the exact timeframe is set out in the patient information leaflet supplied with your medication. Pens should always be protected from direct light and excessive heat.
What if I miss a dose?
If it’s within 4 days of your missed dose, take it as soon as you remember, then resume your normal weekly schedule. If more than 4 days have passed, skip the missed dose and take your next dose on the regular scheduled day — don’t double up.
Managing side effects during titration
- Eat smaller, more frequent meals rather than large ones
- Avoid high-fat or greasy foods, especially around dose increases
- Stay well hydrated
- Eat slowly and stop when comfortably full, not full
Frequently Asked Questions
Can I speed up the titration schedule?
No — dose increases should only happen on your prescriber’s guidance, never sooner than every 4 weeks.
What if side effects are too strong?
Contact your prescriber. They may recommend staying at your current dose for longer before increasing further.
How is Mounjaro injected?
It’s a once-weekly subcutaneous injection using a pre-filled pen, typically into the abdomen, thigh, or upper arm.
Can I change my injection day?
Yes, as long as there’s at least 3 days between doses. If you need to change your regular injection day, your prescriber or the patient information leaflet can advise on how to do this safely.
Considering Mounjaro? Start your free eligibility assessment to see if it’s right for you, or compare it with Wegovy and Zepbound.
Mounjaro dosing schedule: a quick recap
To summarize the Mounjaro dosing schedule: treatment starts at 2.5mg weekly for four weeks, then increases in 2.5mg steps roughly every four weeks, up to a maximum of 15mg, depending on how well you tolerate each step and how your prescriber assesses your response. Sticking closely to the Mounjaro dosing schedule your prescriber sets out, rather than increasing your dose early, is one of the best ways to reduce nausea and other digestive side effects. If a dose increase feels too intense, your prescriber may recommend staying at your current level for longer before stepping up, rather than following a fixed timeline regardless of how you’re responding. Always follow your prescriber’s individualized version of the Mounjaro dosing schedule rather than a generic template, since your starting point and pace may be adjusted based on your health history.