Tirzepatide (Zepbound, Mounjaro)

Proven in people & FDA approved

A real, FDA-approved medicine. Zepbound helps some adults lose weight. Mounjaro is for type 2 diabetes.

Pending medical review Updated October 16, 2026

What is it?

Tirzepatide is a medicine made from a peptide. It is sold as Zepbound and Mounjaro. You need a doctor’s prescription.

Why do people use it?

Doctors use Zepbound to help some adults with obesity, or overweight with a health problem, manage weight. It is used with a healthy diet and more exercise. Mounjaro helps control blood sugar in adults with type 2 diabetes.

Does it really work?

This one is proven. The FDA approved Zepbound for weight management in adults on November 8, 2023.

Is it safe? Side effects

  • The FDA lists side effects like feeling sick, diarrhea, throwing up, constipation, belly pain, feeling tired, burping, and hair loss.
  • It caused thyroid tumors in rats. Nobody knows if it does this in people.
  • People with a family history of a rare thyroid cancer should not use it.
  • The FDA got reports of harm from copy-made (compounded) tirzepatide used at too-high doses.

Talk to your doctor

Do not start any peptide on your own. Ask a doctor first. We never share doses or tell you where to buy. Print our doctor questions sheet.

Check any peptide in 1 secondFree FDA Status Checker: approved, being tested, or not proven.

FAQ

What is Tirzepatide (Zepbound, Mounjaro)?

Tirzepatide is a medicine made from a peptide. It is sold as Zepbound and Mounjaro. You need a doctor’s prescription.

Does Tirzepatide (Zepbound, Mounjaro) work?

This one is proven. The FDA approved Zepbound for weight management in adults on November 8, 2023.

Is Tirzepatide (Zepbound, Mounjaro) legal in the US?

Yes. Zepbound and Mounjaro are FDA-approved. (The FDA is the US agency that checks if medicines are safe and work.) Copy versions mixed by pharmacies, called "compounded," are not FDA-approved.

Related pages

Sources

Not medical advice. Medical disclaimer.