Tirzepatide Dosing Schedule (Mounjaro and Zepbound): A Complete Guide
The standard tirzepatide dosing schedule starts at 2.5 mg once weekly and steps up in 2.5 mg increments — 2.5, 5, 7.5, 10, 12.5, and 15 mg — with at least 4 weeks at each level before any increase. This same ladder applies to both Mounjaro and Zepbound because they are the identical molecule. The only differences are the brand, the approved use, and which dose your prescriber chooses as your long-term maintenance level.
Below is the full titration table, what each step is for, how Mounjaro and Zepbound differ, and how to keep your own schedule organized so you and your prescriber can make better decisions.
What Is Tirzepatide?
Tirzepatide is a once-weekly injectable that activates two gut hormone receptors, GIP and GLP-1. That dual mechanism is why its titration ladder runs longer than semaglutide's and why dose escalation is deliberately slow: stepping up gradually gives your body time to adjust and reduces nausea, vomiting, and other gastrointestinal effects.
It is sold under two brand names with the same active ingredient:
- Mounjaro — approved to improve blood sugar control in adults with type 2 diabetes, used alongside diet and exercise.
- Zepbound — approved for chronic weight management in eligible adults, and for moderate-to-severe obstructive sleep apnea with obesity.
Same molecule, same 2.5 mg-to-15 mg ladder, same once-weekly subcutaneous injection in the abdomen, thigh, or upper arm. If you are tracking either, a dedicated tirzepatide tracker can log the exact brand, dose, and step you are on.
The Tirzepatide Titration Ladder
Tirzepatide uses six dose strengths. You begin at the lowest and move up one step at a time, spending at least 4 weeks at each dose before increasing, according to the FDA prescribing information for both Mounjaro and Zepbound. The 2.5 mg dose is a starting dose only — it is not an approved maintenance dose.
| Step | Dose | Earliest start | Purpose |
|---|---|---|---|
| 1 | 2.5 mg | Weeks 1–4 | Starting dose to let your body adjust; not a maintenance dose |
| 2 | 5 mg | Week 5 onward | First maintenance option; the lowest dose intended for ongoing use |
| 3 | 7.5 mg | Week 9 onward | Intermediate step toward higher maintenance |
| 4 | 10 mg | Week 13 onward | Common maintenance dose |
| 5 | 12.5 mg | Week 17 onward | Higher therapeutic step |
| 6 | 15 mg | Week 21 onward | Maximum approved dose and highest maintenance option |
The "earliest start" column assumes a smooth 4-weeks-per-step climb with no holds. In reality the timeline is rarely that tidy, and that is by design. For Zepbound, the manufacturer identifies 5 mg, 10 mg, and 15 mg as the maintenance dose options, with 7.5 mg and 12.5 mg available as steps in between, per the Zepbound dosing page. For Mounjaro, your prescriber may stop increasing once your blood sugar targets are met.
Why the Climb Is Slow
The gradual step-up is the single most important tool for tolerability. Most gastrointestinal side effects show up in the days after a dose increase, then ease as your body adapts. Rushing the ladder tends to make nausea worse, not progress faster. If a step is rough, prescribers often extend the time at that dose — or even step back down — before trying to advance again.
Mounjaro vs. Zepbound: Same Drug, Different Label
People are often surprised that two "different" medications share an identical dosing schedule. Here is how they line up.
| Mounjaro | Zepbound | |
|---|---|---|
| Active ingredient | Tirzepatide | Tirzepatide |
| Approved use | Type 2 diabetes | Chronic weight management; OSA with obesity |
| Dose strengths | 2.5–15 mg | 2.5–15 mg |
| Titration | 2.5 mg increments, ≥4 weeks/step | 2.5 mg increments, ≥4 weeks/step |
| Injection schedule | Once weekly | Once weekly |
| Maximum dose | 15 mg/week | 15 mg/week |
Because the schedule is the same, the tracking approach is the same too. Whether you are on the diabetes brand or the weight-management brand, you want a clear record of every dose change. If you want brand-specific guidance, see our roundups of the best Mounjaro tracker app and the best Zepbound tracker app.
Your Prescriber Sets the Pace — Not the Calendar
The four-week-per-step ladder is a framework, not a promise. The schedule above describes the fastest recommended pace; your real schedule depends on how you respond. Several things commonly change the timing:
- Tolerability holds. If side effects are significant, your prescriber may keep you at a dose for 8 weeks or longer before advancing.
- "Good enough" maintenance. If you are hitting your blood sugar or weight goals at 5 mg or 7.5 mg, there may be no reason to climb to 15 mg.
- Dose-downs. It is normal to step back down a level if a higher dose is hard to tolerate, then try again later.
- Restarts after gaps. If you miss several weeks, your prescriber may restart you at a lower dose rather than resume where you left off.
The practical takeaway: the right tirzepatide dose is the lowest one that gets you the result you need with side effects you can live with. That is a conversation with your prescriber, informed by your own data. Never adjust your dose on your own, and verify any change with the person who wrote your prescription.
How to Track Your Tirzepatide Schedule
Titration generates a lot to remember: which dose you are on, which week of that dose, when the next increase is due, and how each step felt. A good record turns that into something you and your prescriber can actually use at your next visit.
A few habits that help:
- Log the dose, not just the shot. Record the exact milligram amount and the date, so a dose change is visible on your timeline rather than buried in your memory.
- Mark dose-change dates. Being able to see "this is the week I went from 5 mg to 7.5 mg" makes it easy to connect a dose increase to a change in appetite, weight, or side effects.
- Track side effects against the ladder. Logging nausea or fatigue alongside dose steps shows your prescriber whether a symptom is tied to a recent increase. Our guide to tracking GLP-1 side effects covers what to note.
- Rotate injection sites. Tirzepatide is once weekly for months, so rotating sites matters. A GLP-1 injection site rotation routine helps you avoid reusing the same spot.
This is exactly what OffGrid Dose is built for. It logs every dose and dose change, plots weight against your titration steps, and automates injection site rotation with a visual body map. Critically, it does all of this entirely on your iPhone — no account, no cloud, no servers, and no data collection inside the app. Your dosing history, weight, and side effects never leave your device. For sensitive health information, that on-device approach is the whole point.
You can dig into the full feature set or browse the glossary if a term like "titration" or "GIP receptor agonist" is new to you.
Frequently Asked Questions
Is the tirzepatide dosing schedule the same for Mounjaro and Zepbound?
Yes. Both are tirzepatide and use the identical ladder — 2.5, 5, 7.5, 10, 12.5, and 15 mg, increasing in 2.5 mg steps after at least 4 weeks at each dose. The brand and approved use differ, but the titration does not. Always follow the specific instructions your prescriber gives you.
How long does it take to reach the maximum 15 mg dose?
At the fastest recommended pace of one step every 4 weeks, reaching 15 mg takes roughly 20 weeks. In practice it often takes longer because of tolerability holds, and many people never need the maximum dose — 5 mg, 7.5 mg, or 10 mg may be enough to reach their goals.
What happens if I have side effects when I step up?
Most side effects are gastrointestinal and tend to peak after a dose increase, then settle as your body adjusts. If a higher dose is hard to tolerate, prescribers commonly extend the time at your current dose or step back down before trying again. Report significant or persistent symptoms to your prescriber.
Can my prescriber keep me at a lower dose long-term?
Often, yes — except for the 2.5 mg starting dose, which is not intended for maintenance. For Zepbound, 5 mg, 10 mg, and 15 mg are the maintenance dose options. If a lower dose controls your blood sugar or supports your weight goals with tolerable side effects, there may be no reason to climb higher.
Do I need an app to track tirzepatide dosing?
You do not strictly need one, but titration spans months of weekly injections and multiple dose changes, which is a lot to track by memory. An app that logs each dose, marks dose-change dates, and keeps everything private and on-device makes your visits more productive and your decisions better informed.
This article is for informational purposes only and does not constitute medical advice. Tirzepatide dosing should always be set and adjusted by your prescriber based on your individual response. Verify any dose change with your healthcare provider before acting on it.
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