By Iacob Pastina · Independent Editor
Tirzepatide Dosage Chart for Weight Loss 2026: Complete Schedule (Zepbound, Mounjaro & Compounded)
Verified May 2026: Tirzepatide starts at 2.5 mg once weekly (non-therapeutic starter dose), escalates by 2.5 mg every 4 weeks to a maximum of 15 mg once weekly. Full escalation takes 20 weeks. At 72 weeks, the 15 mg dose produced 20.9% body weight loss in SURMOUNT-1 — equivalent to roughly 47 lbs for a 225-lb person. The 5 mg and 10 mg doses are also valid long-term maintenance doses (15% and 19.5% weight loss respectively). Same dosing schedule applies to Zepbound, Mounjaro, and compounded tirzepatide.
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Verified May 2026: Tirzepatide (Zepbound, Mounjaro) starts at 2.5 mg once weekly for 4 weeks, then increases by 2.5 mg every 4 weeks as tolerated, up to a maximum maintenance dose of 15 mg once weekly. Full escalation from 2.5 mg to 15 mg takes approximately 20 weeks (5 months). According to SURMOUNT-1 72-week data in 2,539 adults without Type 2 diabetes, weight loss outcomes by dose were: 5 mg → 15.0%, 10 mg → 19.5%, 15 mg → 20.9% — or roughly 34 lbs, 44 lbs, and 47 lbs respectively for a 225-lb person. Not every patient needs the maximum 15 mg dose; 5 mg and 10 mg are fully valid long-term maintenance doses per the Zepbound prescribing information. This schedule applies equally to brand-name Zepbound, Mounjaro, and compounded tirzepatide from licensed 503A pharmacies.
Tirzepatide Dosage Chart: Complete Escalation Schedule
The table below reflects the FDA-approved titration schedule from the Zepbound prescribing information and the Mounjaro prescribing information. Both products use the same weekly subcutaneous injection schedule.
| Weeks | Dose | Purpose | Weight Loss (SURMOUNT-1, 72 wk) |
|---|---|---|---|
| 1–4 | 2.5 mg once weekly | Starter (tolerance only — not therapeutic) | Minimal |
| 5–8 | 5 mg once weekly | First therapeutic dose — or long-term maintenance | ~15% (~34 lbs for 225-lb person) |
| 9–12 | 7.5 mg once weekly | Intermediate escalation | Between 5 and 10 mg outcomes |
| 13–16 | 10 mg once weekly | Second maintenance option | ~19.5% (~44 lbs for 225-lb person) |
| 17–20 | 12.5 mg once weekly | Penultimate escalation step | Between 10 and 15 mg outcomes |
| 21+ | 15 mg once weekly | Maximum dose — long-term maintenance | ~20.9% (~47 lbs for 225-lb person) |
Key clarifications: (1) The 2.5 mg starting dose is not a therapeutic dose — it exists solely so your body can build tolerance before the first real dose. (2) Escalation can pause at any step: providers routinely keep patients at 5 mg, 7.5 mg, or 10 mg for extra 4-week cycles before stepping up, especially if GI side effects are significant. (3) The maximum dose is 15 mg. There is no clinical evidence for benefit beyond 15 mg, and no approved higher dose. (4) Once you reach your maintenance dose and are tolerating it, you stay there long-term. For a week-by-week experience guide, see our first month on GLP-1.
Why Does Tirzepatide Start at 2.5 mg?
The 2.5 mg starting dose is a pharmacological ramp-up strategy, not a treatment dose. Tirzepatide activates both GIP and GLP-1 receptors — a dual mechanism that produces significant gastrointestinal effects (nausea, diarrhea, constipation) as the body adjusts. Starting low allows GI tolerance to develop before the dose reaches the therapeutic range. The SURMOUNT-1 trial found that only 4.3% of patients at the 15 mg dose discontinued due to GI side effects — a low rate attributable in part to the gradual escalation protocol. For more on managing the side-effect timeline, see our Zepbound side effects guide.
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Weight Loss Results by Dose: SURMOUNT Trial Data
SURMOUNT-1 enrolled 2,539 adults with BMI ≥ 30 (or ≥27 with at least one weight-related condition) without Type 2 diabetes. At 72 weeks, mean weight loss by randomized maintenance dose:
| Dose | Mean % Body Weight Lost | Mean lbs Lost (225-lb baseline) | Placebo |
|---|---|---|---|
| 5 mg | 15.0% | ~34 lbs | — |
| 10 mg | 19.5% | ~44 lbs | — |
| 15 mg | 20.9% | ~47 lbs | — |
| Placebo | 3.1% | ~7 lbs | 3.1% |
Important context: SURMOUNT-1 enrolled adults without Type 2 diabetes — higher BMI populations who respond more robustly to GLP-1/GIP agonists. In SURMOUNT-2, which enrolled adults with Type 2 diabetes, weight loss was somewhat lower: 12.8% at 5 mg, 14.7% at 10 mg, and 15.7% at 15 mg at 72 weeks. If you have Type 2 diabetes, your provider should calibrate expectations accordingly. Neither dataset guarantees individual results — genetics, diet, activity, and adherence are major variables. Use our cost calculator to estimate your monthly expense at different dose levels.
Do I Need to Reach 15 mg?
No. The Zepbound prescribing information explicitly lists 5 mg, 10 mg, and 15 mg as acceptable long-term maintenance doses. Many patients achieve significant, sustainable weight loss at 5 mg or 10 mg with fewer side effects than at 15 mg. Clinical practice guidelines from the American Diabetes Association support individualized dosing — the goal is the lowest dose that achieves your health targets, not the maximum dose. Some providers prefer a 'minimal effective dose' approach: escalate to the dose where weight loss stabilizes, then maintain there rather than pushing to 15 mg if it's unnecessary.
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Compounded Tirzepatide Dosing: Is It the Same?
Yes. Compounded tirzepatide from licensed 503A pharmacies uses the same active ingredient at the same concentrations. Telehealth providers prescribe the same escalation schedule — 2.5 mg weekly for 4 weeks, then titrating up every 4 weeks — though individual providers may customize the pace based on your response and tolerance. The main differences with compounded versions are: (1) they are not FDA-approved as Zepbound or Mounjaro; (2) they are not manufactured by Eli Lilly; (3) they typically cost $99–$299/month versus $299–$449/month for brand-name LillyDirect vials. As of May 2026, the FDA has proposed excluding tirzepatide from the 503B bulk compounding list — 503A patient-specific compounding remains available under narrower criteria. See our compounded tirzepatide guide for current legal status.
Telehealth providers currently offering compounded tirzepatide include Embody ($149 first month, includes unique oral tirzepatide gum option), Shed, Found, and TMates. Use our match quiz to find the right provider for your profile.
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Take the 60-sec QuizWhat If I Miss a Tirzepatide Dose?
- •Within 4 days of the missed dose: Take it as soon as you remember, then resume your regular weekly schedule.
- •More than 4 days after the missed dose: Skip the missed dose. Take your next injection on the regularly scheduled day.
- •Never double up: Do not take two doses in the same week to make up for a missed dose.
- •Resuming after a long break: If you stopped tirzepatide for more than 4 weeks and restart, ask your provider whether to resume at your previous maintenance dose or restart the titration from 2.5 mg. Resuming at a high dose after a gap often causes worse GI side effects.
Can I Change the Day I Inject?
Yes, with one constraint: at least 3 days (72 hours) must separate your two most recent injections. For example, if you normally inject on Sunday but want to switch to Thursday, you can make the change as long as your previous Sunday dose was at least 3 days earlier. After the transition, continue injecting on the new day each week. Consistency matters because tirzepatide has a half-life of approximately 5 days — irregular spacing can cause uneven drug levels and increase GI symptoms.
Tirzepatide Dosage FAQ
How long does it take to reach the maximum tirzepatide dose?
Following the standard FDA escalation schedule (4 weeks at each dose), reaching 15 mg takes 20 weeks (5 months): 4 weeks at 2.5 mg + 4 weeks at 5 mg + 4 weeks at 7.5 mg + 4 weeks at 10 mg + 4 weeks at 12.5 mg = 20 weeks, then 15 mg begins at week 21. Many providers slow this schedule by adding extra 4-week holds at intermediate doses, especially for patients sensitive to GI side effects.
Does tirzepatide dosage differ for weight loss vs. Type 2 diabetes?
The escalation schedule is identical. Zepbound (for weight management) and Mounjaro (for Type 2 diabetes) both start at 2.5 mg and follow the same 4-week escalation steps. The FDA-approved maximum dose is 15 mg for both. Maintenance dose selection may differ because T2D patients may prioritize glycemic control at lower doses, while obesity patients are often escalated more aggressively toward 10–15 mg for weight loss benefit.
Is 5 mg tirzepatide enough for meaningful weight loss?
Yes. SURMOUNT-1 showed 15% mean body weight loss at 5 mg over 72 weeks — for a 225-lb person, that's roughly 34 lbs. Compared to other GLP-1 medications, 5 mg tirzepatide produces more weight loss than most semaglutide programs. A significant proportion of patients achieve and maintain their target weight at 5 mg without needing to escalate further.
What is the maximum tirzepatide dose?
15 mg once weekly is the maximum FDA-approved dose for both Zepbound and Mounjaro. There is no approved higher dose, and clinical trials have not demonstrated meaningful additional benefit beyond 15 mg.
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Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting any medication. Information is current as of the publication date but may change.
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