Semaglutide vs Tirzepatide: Which GLP-1 Is Better for Weight Loss?

At Mint Aesthetics & Skin in Indianapolis, this is the question we hear most from new weight loss patients — so here is our honest breakdown.

Both semaglutide and tirzepatide are injectable medications that have transformed medical weight loss. They belong to a class of drugs called GLP-1 receptor agonists, and both are FDA-approved for weight management. But they work differently, and understanding those differences can help you and your provider choose the right option.

How Semaglutide Works

Semaglutide is a GLP-1 receptor agonist — the active ingredient in brand-name medications like Ozempic (for type 2 diabetes) and Wegovy (for weight management). It mimics the GLP-1 hormone that your body naturally produces after eating.

Semaglutide works by:

• Signaling fullness to your brain (reducing appetite)
• Slowing stomach emptying (helping you feel satisfied longer)
• Improving blood sugar regulation

In the landmark STEP clinical trials, participants on semaglutide 2.4mg lost an average of 14.9% of their body weight over 68 weeks.

How Tirzepatide Works

Tirzepatide is a dual GLP-1/GIP receptor agonist — the active ingredient in Mounjaro (for type 2 diabetes) and Zepbound (for weight management). It activates both the GLP-1 and GIP hormone receptors, which is what makes it unique.

Tirzepatide works by:

• Activating GLP-1 receptors (same appetite reduction as semaglutide)
• Activating GIP receptors (additional metabolic benefits, including improved fat metabolism)
• Slowing stomach emptying and improving insulin sensitivity

In the SURMOUNT-1 trial, participants on the highest dose of tirzepatide (15mg) lost an average of 22.5% of their body weight over 72 weeks — significantly more than semaglutide in comparable studies.

Semaglutide vs Tirzepatide: Side-by-Side Comparison

Which GLP-1 Is Better for Weight Loss?

Based on clinical data, tirzepatide shows greater average weight loss than semaglutide. However, "better" depends on your individual situation:

• Choose semaglutide if: You want a well-established option with extensive long-term safety data, or if tirzepatide causes side effects you cannot tolerate
• Choose tirzepatide if: Maximizing weight loss is your primary goal, or if you have not achieved desired results with semaglutide alone

At Mint Aesthetics & Skin, we offer both medications — including compounded options — and Keely will recommend the right choice based on your health history, goals, and how your body responds during the initial titration period.

Does Semaglutide Make You Tired?

Some patients report fatigue during the initial weeks of semaglutide treatment, particularly during dose increases. This is usually temporary and often related to reduced calorie intake as appetite decreases. Staying hydrated, eating balanced meals, and following your provider's guidance can help minimize fatigue.

Tirzepatide Dosage Chart

Tirzepatide follows a structured dose escalation to minimize side effects:

• Weeks 1-4: 2.5mg weekly (starting dose)
• Weeks 5-8: 5mg weekly
• Weeks 9-12: 7.5mg weekly
• Weeks 13-16: 10mg weekly
• Week 17+: 12.5mg or 15mg weekly (if needed)

Dose increases happen every 4 weeks, and Keely monitors your progress and side effects at each step to ensure a safe, effective experience.

What About Skin After Weight Loss?

Significant weight loss can sometimes lead to skin laxity, particularly in the abdomen, arms, and thighs. At Mint Aesthetics & Skin, we offer Exion Body treatments — a non-invasive combination of radiofrequency and targeted ultrasound — for skin tightening and body contouring after weight loss.

Schedule a Weight Loss Consultation in Indianapolis

Ready to start your weight loss journey? Schedule a weight loss consultation at Mint Aesthetics & Skin in Indianapolis. Keely Phelps, PA will review your health history, discuss your goals, and recommend whether semaglutide or tirzepatide is the right fit for you. Consultations are $75 and include a comprehensive health assessment.