What is Mounjaro?

What is Mounjaro?

Mounjaro is the brand name for tirzepatide, a medication FDA-approved for treating type 2 diabetes. It’s manufactured by Eli Lilly and was approved in May 2022. Mounjaro is notable for being the first dual GIP/GLP-1 receptor agonist.

How is Mounjaro Different from Zepbound?

Both contain tirzepatide but are approved for different conditions:

Feature	Mounjaro	Zepbound
Approved For	Type 2 diabetes	Weight management
Manufacturer	Eli Lilly	Eli Lilly
FDA Approval	May 2022	November 2023
Doses Available	2.5-15 mg	2.5-15 mg

How Does Mounjaro Work?

Mounjaro is unique because it activates two hormone receptors instead of one:

GLP-1 Receptor Activation

• Increases insulin when blood sugar is high
• Slows gastric emptying
• Reduces appetite

GIP Receptor Activation

• Enhances insulin secretion
• May improve fat metabolism
• Complements GLP-1 effects

This dual action is why tirzepatide is called a “twincretin.”

What is Mounjaro Approved For?

FDA-Approved Indication

• Type 2 diabetes — to improve blood sugar control as an adjunct to diet and exercise

Can Be Used

• As monotherapy (alone)
• With other diabetes medications
• With or without metformin

Not Approved For

• Weight management (use Zepbound)
• Type 1 diabetes
• Diabetic ketoacidosis

What Does the Research Show?

The SURPASS clinical trial program demonstrated strong results:

Trial	Comparison	HbA1c Reduction (15 mg)
SURPASS-1	vs placebo	-2.07%
SURPASS-2	vs semaglutide 1 mg	-2.30% vs -1.86%
SURPASS-3	vs insulin degludec	-2.37% vs -1.34%

Many participants achieved HbA1c levels below 5.7% (non-diabetic range).

Key Facts

Fact	Detail
Administration	Once weekly injection
Starting Dose	2.5 mg (titrated up)
Maximum Dose	15 mg
Device	Pre-filled single-dose pen

Common Side Effects

• Nausea (usually mild and temporary)
• Diarrhea
• Decreased appetite
• Vomiting
• Constipation

Who Should Not Use Mounjaro?

• People with personal or family history of medullary thyroid carcinoma
• People with Multiple Endocrine Neoplasia syndrome type 2
• Those with known hypersensitivity to tirzepatide

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This guide is for educational purposes only. Mounjaro is a prescription medication requiring medical supervision.