Weight & metabolism

Tirzepatide (Mounjaro, Zepbound): benefits, results & how to take it

FDA-approved Checked against official sources Oct 16, 2026

Quick facts

What it is: a weekly injection that acts on two hormone receptors, GIP and GLP-1.
Status: FDA-approved, prescription only. Mounjaro is for type 2 diabetes. Zepbound is for weight management and obstructive sleep apnea with obesity.
When to take it: once weekly, any time of day, with or without meals.
Evidence: strong, from large randomized trials, including a head-to-head trial against semaglutide.
Most common side effects: gastrointestinal, mostly while the dose is being increased.

What is Tirzepatide?

Tirzepatide activates two hormone receptors, GIP and GLP-1. It's sold as Mounjaro (type 2 diabetes) and Zepbound (weight management).

Is Tirzepatide FDA-approved?

FDA-approved prescription medicine. Mounjaro (approved 2022) is labeled for blood-sugar control in type 2 diabetes. Zepbound (approved 2023) is labeled for long-term weight management in certain adults and for moderate-to-severe obstructive sleep apnea in adults with obesity. Sources: Drugs@FDA Mounjaro, Zepbound.

When to take tirzepatide & dose schedule: what the FDA label says

Your prescriber sets your dose. This is a summary of the official FDA label to help you follow along, not a plan to start, change, or stop anything.

Mounjaro — FDA label on DailyMed

Once weekly, any time of day, with or without meals. Rotate injection sites.
Starts at 2.5 mg weekly (a starter dose), then 5 mg after 4 weeks. It can increase in 2.5 mg steps, each after at least 4 weeks.
Maximum: 15 mg weekly for adults, and 10 mg weekly for children 10 and older.
Missed dose: take it within 4 days (96 hours). Otherwise skip it. The dosing day can be changed if doses stay at least 3 days apart.

Zepbound — FDA label on DailyMed

Once weekly. Starts at 2.5 mg for 4 weeks, then 5 mg, increasing in 2.5 mg steps at least 4 weeks apart.
Label maintenance doses: 5, 10, or 15 mg weekly for weight reduction, and 10 or 15 mg weekly for sleep apnea. Maximum 15 mg.
The missed-dose rule is the same as Mounjaro: within 4 days, otherwise skip.

What the research shows

SURMOUNT-1 (NEJM, 2022, PMID 35658024): a 72-week RCT in adults with obesity that found substantial, sustained weight reduction vs. placebo. GI side effects were the most common.
SURMOUNT-5 (NEJM, 2025, PMID 40353578): a head-to-head trial in 751 people with obesity but without diabetes. Average weight change was −20.2% with tirzepatide vs. −13.7% with semaglutide at 72 weeks.
Real-world heart outcomes (2026, PMID 42840232): an observational study linking tirzepatide to fewer cardiovascular events than semaglutide in type 2 diabetes. Association only. See Issue #1.

New to these terms? See the glossary.

Tirzepatide FAQ

When should I take tirzepatide?

The FDA labels say once weekly, at any time of day, with or without meals. Many people pick a consistent day.

What is the tirzepatide dose schedule?

Per the labels, it starts at 2.5 mg weekly for 4 weeks, then 5 mg, with possible 2.5 mg increases at least 4 weeks apart, up to 15 mg. Your prescriber sets your dose.

What if I miss a Mounjaro or Zepbound dose?

The labels say take it within 4 days (96 hours). If more time has passed, skip it and take the next dose on your usual day.

Is Mounjaro the same as Zepbound?

Both are tirzepatide, but they're separate FDA-approved products with different indications.

Is tirzepatide stronger than semaglutide?

In the SURMOUNT-5 trial of people with obesity but without diabetes, tirzepatide led to more average weight loss at 72 weeks (−20.2% vs −13.7%).

Not medical advice. Education only. We don't sell anything or tell you what to take. Label doses are there so you can follow along with your prescriber. Talk to a licensed clinician about your health.

All guides: Semaglutide · Retatrutide · Orforglipron (Foundayo) · BPC-157 · TB-500 (thymosin beta-4) · GHK-Cu (copper peptide) · Collagen peptides · Tesamorelin (Egrifta) · CJC-1295 & ipamorelin · MOTS-c · Semax · PT-141 (bremelanotide, Vyleesi) · Peptides 101 · Why is peptide info so confusing?