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Mounjaro vs. Contrave

Published on 
February 3, 2025
Virta Team

Mounjaro and Contrave differ in both mechanism and primary use. Mounjaro, a dual GIP and GLP-1 agonist, is for type 2 diabetes management and provides significant HbA1c reductions and moderate weight loss. Contrave, a combination of naltrexone and bupropion, targets weight management, delivering moderate weight loss. Side effects differ: Mounjaro causes nausea, while Contrave may lead to mood changes and insomnia. Mounjaro costs $1,135/month, significantly higher than Contrave’s $300/month. Neither drug currently faces shortages.

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

How Contrave Works

Bupropion enhances dopamine and norepinephrine activity, reducing appetite and cravings; Naltrexone modulates the brain’s reward system, reducing cravings and emotional eating behaviors by blocking opioid receptors.

Common Side Effects

Nausea, constipation, headache, dizziness, dry mouth, and insomnia.

Serious Potential Side Effects

Increased blood pressure, seizures (rare), suicidal thoughts, and liver damage.

Brand Name

Mounjaro
Contrave

Generic Name

Tirzepatide
Bupropion/Naltrexone

Overview

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.
Combines bupropion (an antidepressant) and naltrexone (an opioid antagonist) to target brain pathways involved in hunger and cravings, supporting weight management when paired with lifestyle changes.

Year Approved

2022
2014

Category

Dual GIP and GLP-1
Other

Indicated for

Type 2 diabetes management
Chronic weight management in adults with obesity or overweight with related conditions

Administration type

Injectable
Oral

Also used (but not approved) for

Weight Management

Frequency

Once / week
2x / day

Typical dose range

2.5–15 mg
8 / 90 mg–32 / 360 mg

Average cost per month

$1,135
$150-$300

Availability

No current shortages
No current shortages