Dosing Guide
Mounjaro Dose Schedule Guide
Quick Answer: Mounjaro treatment begins at 2.5 mg once weekly and increases every four weeks through 5 mg, 7.5 mg, 10 mg and 12.5 mg before reaching the maximum maintenance dose of 15 mg at approximately week 21. Not all patients need to reach 15 mg — some achieve excellent results at 10 mg or 12.5 mg.6 stepsin the Mounjaro dose escalation schedule
20 weeksto reach 15 mg maintenance dose
15 mgmaximum licensed maintenance dose — best efficacy
Full Escalation Chart
Mounjaro Dose Escalation Schedule
The full Mounjaro dosing schedule from first injection to maintenance, reflecting MHRA-approved prescribing information and NICE TA1026. Note: Mounjaro has six steps versus Wegovy's four, and a longer escalation period — 20 weeks versus 16 weeks. Not all patients need to reach 15 mg.
Missed Dose Guide
| Dose | Timeline | Purpose | Side Effects | Stage |
|---|---|---|---|---|
| 2.5 mg | Weeks 1–4 | Tolerability dose — body adjustment | Mild nausea possible | Escalation |
| 5 mg | Weeks 5–8 | First escalation | Nausea may increase; diarrhoea common | Escalation |
| 7.5 mg | Weeks 9–12 | Second escalation | Peak nausea period for most patients | Escalation |
| 10 mg | Weeks 13–16 | Third escalation | GI settling; appetite markedly reduced | Escalation |
| 12.5 mg | Weeks 17–20 | Fourth escalation | Nausea reducing; body well adapted | Escalation |
| 15 mg | Week 21+ | Maintenance | Side effects substantially settled | Maintenance |
| Scenario | What to Do |
|---|---|
| Missed dose — 4 days or fewer have passed | Take the missed dose as soon as you remember. Resume your usual weekly day. |
| Missed dose — more than 4 days have passed | Skip the missed dose entirely. Take next dose on usual scheduled day. Do not double up. |
| Missed multiple doses (1–2 weeks) | Resume on normal schedule. Expect a temporary return of side effects. |
| Extended break (4+ weeks) | Contact your prescribing clinician — a dose reduction and re-escalation is likely required. |
Important: Mounjaro has a shorter half-life (~5 days) than Wegovy (~7 days), meaning blood concentrations fall more quickly between injections. Maintaining a consistent weekly injection schedule is particularly important for sustained appetite suppression.
Clinical Outcomes by Dose
Weight Loss at Each Maintenance Dose
| Maintenance Dose | Avg Weight Loss (SURMOUNT-1, 72 wks) | Typical Patient Profile |
|---|---|---|
| 10 mg | ~19.5% | Patients who find higher doses cause persistent GI symptoms; good responders at this level |
| 12.5 mg | ~20.9% | Near-maximum efficacy with better tolerability for some; penultimate step |
| 15 mg | ~22.5% | Standard maintenance target; recommended for all patients who can tolerate full escalation |
FAQs
Frequently Asked Questions
Mounjaro treatment begins at 2.5 mg once weekly for four weeks, then increases every four weeks through 5 mg, 7.5 mg, 10 mg and 12.5 mg before reaching the maximum maintenance dose of 15 mg at approximately week 21. All doses are administered as a once-weekly subcutaneous injection.
Mounjaro doses are increased every four weeks under the standard schedule. This interval allows the body's GLP-1 and GIP receptors to adapt to each dose level before stimulation is increased further. Some patients follow a slower six- or eight-week schedule.
Yes — remaining at 10 mg or 12.5 mg is clinically acceptable when 15 mg causes intolerable side effects despite dietary management. Both doses produce clinically meaningful weight loss. However, a slower escalation schedule — spending six or eight weeks at each step — is usually preferable to permanently staying below maximum dose.
The starting dose of Mounjaro is 2.5 mg once weekly. This is a tolerability dose rather than a full therapeutic dose — it is designed to allow the body to adjust to tirzepatide before escalation begins. Most patients find the starting dose well tolerated.
The maximum licensed dose of Mounjaro is 15 mg once weekly. This is also the maintenance dose and produces the highest average weight loss — approximately 22.5% of body weight over 72 weeks in SURMOUNT-1.
If fewer than four days have passed since your missed dose, take it as soon as you remember. If more than four days have passed, skip it and resume on your usual schedule. Never double up. After an extended break of four or more weeks, contact your prescribing clinician as a dose reduction may be required.
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Jastreboff AM et al. SURMOUNT-1. N Engl J Med. 2022. Mounjaro SmPC. Eli Lilly. 2023. NICE TA1026. 2024. Happy Pharmacy (GPhC No. 9012585). Educational purposes only.