Tirzepatide dosage follows a fixed ladder on the FDA-approved labels: 2.5 mg once weekly for 4 weeks, then increases of 2.5 mg no sooner than every 4 weeks, up to a maximum of 15 mg weekly. Compounded tirzepatide at Telos Rx is prescribed only after review by a licensed provider.
Most tirzepatide dosing confusion comes from mixing three things: what the brand labels specify, what a compounding pharmacy puts in a vial, and what a provider decides for one patient. Only the first is published. Here is what it says, and why. Nothing below overrides your own prescribing provider.
The Tirzepatide Titration Schedule, Step by Step
Tirzepatide is a dual GIP and GLP-1 receptor agonist from Eli Lilly, given as a once-weekly subcutaneous injection. It is sold under two brand names, but the escalation pattern is the same.
The starting dose of tirzepatide is 2.5 mg once weekly for four weeks. From there the label allows increases of 2.5 mg at a time, with at least four weeks on the current dose before stepping up again. Six strengths exist: 2.5, 5, 7.5, 10, 12.5 and 15 mg.
| Weekly dose | Minimum time before any step up | What the labels say about it |
|---|---|---|
| 2.5 mg | 4 weeks | Starting dosage for all indications. Zepbound's label: for initiation, not approved as a maintenance dosage. |
| 5 mg | At least 4 weeks | First step up. Lowest Zepbound maintenance dosage for weight reduction. |
| 7.5 mg | At least 4 weeks | Intermediate strength, not a listed maintenance dosage. |
| 10 mg | At least 4 weeks | Maintenance dosage for weight reduction, and one of two for sleep apnea. |
| 12.5 mg | At least 4 weeks | Second intermediate strength, again not a maintenance dosage. |
| 15 mg | Top of the ladder | Maximum dosage for adults, all indications. |
Read the middle column carefully. Four weeks is a floor, not a schedule. The Mounjaro prescribing information puts increases "after at least 4 weeks on the current dose", which permits staying longer but not moving faster.
Why Titration Exists in the First Place
The label answers this directly. Mounjaro's dosing section introduces the ladder with a single line of reasoning: follow the escalation to reduce the risk of gastrointestinal adverse reactions.
Nausea, vomiting, diarrhea and constipation are the common adverse effects of tirzepatide, and they cluster around dose increases. Stepping up slowly gives the gut time to adapt to slower gastric emptying and changed appetite signalling instead of meeting the full effect at once.
The pivotal trials were built the same way. SURMOUNT-1, the 72-week phase 3 obesity trial, randomized 2,539 adults to tirzepatide 5, 10 or 15 mg weekly or placebo with a 20-week dose-escalation period built in, roughly a quarter of the trial.
Mounjaro and Zepbound: One Molecule, Two Labels
Mounjaro was approved in 2022 for type 2 diabetes. Zepbound was approved in November 2023 for chronic weight management, and in December 2024 for moderate to severe obstructive sleep apnea in adults with obesity. Same molecule, same 2.5 mg start, same 15 mg ceiling.
The differences sit in the maintenance range. Under Zepbound, the approved maintenance dosages are 5, 10 or 15 mg weekly for weight reduction and 10 or 15 mg weekly for sleep apnea, per the Zepbound prescribing information. Mounjaro caps adults at 15 mg and pediatric patients aged 10 and older at 10 mg.
So a Mounjaro dose and a Zepbound dose at the same number are the same amount of the same drug, and a Mounjaro dosage table describes the same ladder. If the branding is the confusing part, is Mounjaro tirzepatide and is Zepbound the same as tirzepatide untangle the names.
Both labels carry a boxed warning: tirzepatide caused thyroid C-cell tumors in rodents, and it is contraindicated with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2. That applies at every dose.
The schedule above is what the labels specify. What is appropriate for you is a separate question, and it belongs to a licensed provider who has seen your health history.
See tirzepatide at Telos RxWhy Compounded Tirzepatide Dosing Varies
Compounded tirzepatide is not FDA-approved. It is prepared by licensed US compounding pharmacies under federal compounding regulations, against a prescription for a named patient, and carries no FDA-approved label of its own.
Two consequences follow. The brand ladder is a clinical reference for prescribers rather than a rule binding a compounded prescription, which is why protocols differ between providers. And compounded tirzepatide is supplied in vials at concentrations the pharmacy sets, so the same milligram dose can be a different volume from one vial to the next.
That second point is where most dosing errors start. Milligrams are the dose; millilitres and syringe units are only the measure. We covered the conversion problem in tirzepatide dosing in mL: no universal calculator exists, because concentration is not universal. The pens versus vials comparison explains why the formats behave differently.
Where Microdosing Fits
Microdosing means a provider-directed protocol using amounts below the standard label steps, often for people who want a lower-intensity approach or did not tolerate a conventional escalation. It is a variant of prescribing, not a separate category.
Telos Rx offers microdosed tirzepatide as its own pathway. The evidence and schedule questions sit in microdosing tirzepatide schedule and what the microdosing research shows. Neither approach is inherently better; that is what provider review is for.
What Changes the Pace of a Titration
The four-week minimum is the fastest the labels permit. Real schedules often move more slowly, and a few things account for that.
- Tolerability. If gastrointestinal effects are significant, a provider may hold longer or step back down. See tirzepatide side effects and managing GLP-1 side effects.
- Response at a lower dose. The maximum is a ceiling, not a target. Someone doing well at 5 or 10 mg has no automatic reason to keep climbing.
- Plateaus. A stall is not automatically a signal to increase. GLP-1 weight loss plateaus covers what else is usually going on.
- Missed doses. Zepbound's label states a missed dose may be administered as soon as possible within 4 days, meaning 96 hours. Your own prescription instructions govern here.
- Formulation changes. Switching format or concentration is a moment to re-confirm the dose, not assume it carries across. Injection technique is a separate skill from dose selection.
Dose Is Not a Price Lever at Telos Rx
On many platforms the monthly cost rises with the dose, quietly turning a clinical decision into a budget one. Telos Rx uses flat pricing, so the monthly cost does not change as a clinician titrates the dose.
As of publication, the tirzepatide page shows pricing as low as $139 per month, with the exact figure depending on plan length, plus free 48-hour shipping if approved, FSA and HSA eligibility, and cancel anytime. The wider cost picture is in tirzepatide cost.
How Dose Decisions Get Made in an Asynchronous Visit
Telos Rx is an online-first, asynchronous telehealth service, so there is no appointment to book. You complete a written intake covering health history, medications, prior GLP-1 experience and goals, and a licensed provider reviews it in writing, often within hours.
Everything is subject to medical approval by a licensed provider, and approval is not guaranteed. If tirzepatide is appropriate, the prescription specifies your starting dose and escalation plan, and that plan is the one to follow, not any chart online, including this one.
Earlier in the process: what is tirzepatide covers the molecule, how to start GLP-1 therapy covers the sequence, and our provider-question guide lists what to raise. The parallel ladder is in semaglutide dosage.
Frequently Asked Questions
What is the starting dose of tirzepatide?
The labels for Mounjaro and Zepbound both set the recommended starting dosage at 2.5 mg injected subcutaneously once weekly for 4 weeks. Zepbound adds that 2.5 mg is for treatment initiation and is not approved as a maintenance dosage. A prescribing provider decides the starting point for compounded tirzepatide.
How often can the tirzepatide dose be increased?
The labels allow increases of 2.5 mg after at least 4 weeks on the current dose. Four weeks is a minimum interval, not an instruction to increase on schedule, and many people stay longer. Whether and when to step up is a decision for the prescribing provider.
What is the maximum tirzepatide dosage?
15 mg once weekly is the maximum for adults across all approved indications. Mounjaro's label sets a lower maximum of 10 mg weekly for pediatric patients aged 10 and older. The maximum is a ceiling, not a goal, and there is no requirement to reach it if a lower dose is working.
Why does compounded tirzepatide dosing look different from Mounjaro dosing?
Compounded tirzepatide is not FDA-approved and carries no label of its own, so the brand ladder functions as a clinical reference for prescribers rather than a binding rule. Compounded vials also come in pharmacy-set concentrations, so the same milligram dose can be a different volume than a brand pen delivers.
Is 2.5 mg of tirzepatide enough to work?
2.5 mg is defined on the label as an initiation dose rather than a maintenance dose, and the pivotal obesity trial studied maintenance doses of 5, 10 and 15 mg. Some people are prescribed lower amounts under a microdosing approach. Whether any dose is appropriate is a provider decision, and individual results vary.
What happens if a weekly tirzepatide dose is missed?
Zepbound's prescribing information states that a missed dose may be administered as soon as possible within 4 days, or 96 hours. Compounded prescriptions come with their own instructions, which are the ones that apply to you. If the timing is unclear, ask your provider before guessing.
TelosRX is LegitScript-certified. Compounded medications are not FDA-approved and are prepared under federal compounding regulations. Approval is subject to evaluation by a licensed provider; approval is not guaranteed. Individual results vary. TelosRX operates as an online-first, asynchronous telehealth service.
Ready to find out what a provider would recommend for you? Start with the tirzepatide product page, then complete the written intake: start an online visit. A licensed provider reviews every request, and approval is not guaranteed.