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FDA-approvedMetabolic Mounjaro, Zepbound

Tirzepatide

An approved dual-receptor drug with the largest average weight loss of any approved agent.

Class
Dual GIP / GLP-1 receptor agonist
Molar mass
4,814 g/mol
Half-life
~5 days
Human PK
Fully characterised
Regulatory
FDA-approved (T2D, obesity, OSA)
Sport
Not prohibited

What it is claimed to help

These are the uses attached to Tirzepatide in research, clinical practice, or marketing. Listing a claim is not endorsing it — tap any of them to see every other compound carrying the same claim.

What the human evidence actually is

Grade: FDA-approved

Approved by the FDA with randomised human trial data behind the label.

Extensive. SURPASS and SURMOUNT programmes. SURMOUNT-1 produced roughly 20% mean body weight reduction at the top dose. SUMMIT showed benefit in HFpEF with obesity. SURMOUNT-OSA led to FDA approval for obstructive sleep apnea in 2024 — the first drug ever approved for it. SYNERGY-NASH reported high rates of steatohepatitis resolution.

How it is supposed to work

Single molecule agonising both the GIP and GLP-1 receptors, with greater weight effect than GLP-1 agonism alone.

Safety

Gastrointestinal effects dominate. Same rodent thyroid C-cell boxed warning. Pancreatitis and gallbladder events reported. Compounded 'tirzepatide' from gray-market suppliers has been the subject of repeated FDA warning letters.

Storage and handling

Lyophilised peptide is generally stored at 2–8 °C, or below −20 °C for long-term storage. Reconstituted in bacteriostatic water (0.9% benzyl alcohol) a solution is typically treated as usable for about 28 days refrigerated, versus roughly 24 hours for plain sterile water, which has no preservative. Add the water slowly down the vial wall and swirl — never shake, which shears peptide chains and foams the solution.

The arithmetic is the dangerous part

Whatever number a protocol or a prescriber gave you, converting it into syringe units is where a misplaced decimal becomes a tenfold error. Our calculators do that conversion and nothing else — they never invent a dose.

Open the calculators

Sources

  1. FDA prescribing information, Mounjaro / Zepbound
  2. SURMOUNT-1, NEJM 2022
  3. SUMMIT HFpEF trial, NEJM 2025
  4. SURMOUNT-OSA, NEJM 2024

Verified against primary sources on 27 August 2026. Regulatory status in this field changes several times a year. See How We Rate Evidence.

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A supplier’s published protocol

Purpose
Fat loss
Vial size
10 mg
BAC water
2 ml
Dose
0.5 mg
Units on a U-100 (1 ml)
10
Timing
AM
Frequency
3× weekly
Cycle length
Until goal