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Wegovy vs. Mounjaro

Published on 
February 3, 2025
Virta Team

Wegovy and Mounjaro differ in their mechanisms and approvals. Wegovy is a GLP-1 receptor agonist approved for chronic weight management, while Mounjaro, a dual GIP and GLP-1 agonist, is primarily for type 2 diabetes. Wegovy excels in weight loss (approximately 15% of bodyweight), whereas Mounjaro shows superior HbA1c reductions and promising weight benefits. Wegovy lacks off-label uses, but Mounjaro is also used for weight management. Both have similar side effects like nausea, but Mounjaro has a higher risk of thyroid tumors. Cost-wise, Wegovy is slightly more expensive at $1,375/month compared to Mounjaro's $1,135/month. Neither drug faces shortages.

How Wegovy Works

Slows gastric emptying, reduces appetite, and enhances feelings of fullness, leading to lower calorie intake. It also stimulates insulin release and reduces glucagon secretion, improving blood sugar control.

Common Side Effects

Nausea, vomiting, diarrhea, constipation, abdominal pain, headache, and fatigue.

Serious Potential Side Effects

Pancreatitis, gallbladder issues, kidney problems, and increased heart rate, thyroid cancer, anaphylaxis (or serious allergic reactions)

How Mounjaro Works

Enhances the effects of both incretin hormones. GIP improves insulin sensitivity and enhances fat metabolism, while GLP-1 reduces appetite, delays gastric emptying, and promotes insulin secretion, making it effective for blood sugar control and weight loss.

Common Side Effects

Nausea, vomiting, diarrhea, decreased appetite, and indigestion

Serious Potential Side Effects

Pancreatitis, thyroid tumors (potential risk), gallbladder issues, kidney problems, and serious allergic reactions

Brand Name

Wegovy
Mounjaro

Generic Name

Semaglutide
Tirzepatide

Overview

Used for chronic weight management in adults with obesity or overweight with related conditions and for cardiovascular event risk reduction in patients with type 2 diabetes and established cardiovascular disease. It helps regulate appetite and reduce calorie intake by mimicking a hormone that influences hunger and satiety.
Dual GIP and GLP-1 receptor agonist for type 2 diabetes management, showing promise in significant weight loss through appetite regulation and enhanced insulin sensitivity.

Year Approved

2021 for weight loss 2024 for cardiovascular risk reduction
2022

Category

GLP-1
Dual GIP and GLP-1

Indicated for

Chronic weight management and reducing risk of major cardiovascular events
Type 2 diabetes management

Administration type

Injectable
Injectable

Also used (but not approved) for

Weight Management

Frequency

Once / week
Once / week

Typical dose range

0.25–2.4 mg
2.5–15 mg

Average cost per month

$1,375
$1,135

Availability

No current shortages
No current shortages