If you are considering GLP-1 therapy for weight loss, you have probably encountered two names more than any others: semaglutide (Wegovy, Ozempic) and tirzepatide (Zepbound, Mounjaro). Both are weekly injectable medications. Both produce significant weight loss. And both are available at Rejuvenate & Wellness Center.
But they are not the same medication — and the differences matter when it comes to choosing the right one for your body, your goals, and your health history.
How They Work: The Key Difference
Semaglutide is a GLP-1 receptor agonist. It mimics glucagon-like peptide-1, a gut hormone that suppresses appetite, slows gastric emptying, and improves insulin sensitivity.
Tirzepatide is a dual GLP-1 and GIP receptor agonist. It activates both GLP-1 receptors and GIP (glucose-dependent insulinotropic polypeptide) receptors simultaneously. GIP receptors are expressed in fat tissue and the brain, and their activation appears to enhance the appetite-suppressing and fat-burning effects of GLP-1 stimulation.
The Simple Version
Semaglutide pulls one lever. Tirzepatide pulls two. This is why tirzepatide tends to produce greater average weight loss — but it also means more variables to manage.
Head-to-Head: What the Data Shows
| Factor | Semaglutide | Tirzepatide |
|---|---|---|
| Mechanism | GLP-1 agonist | GLP-1 + GIP dual agonist |
| Avg. weight loss (trials) | ~15% body weight (STEP) | ~20–22% body weight (SURMOUNT) |
| Dosing | Weekly injection, up to 2.4mg | Weekly injection, up to 15mg |
| FDA approval | Obesity (Wegovy), T2D (Ozempic) | Obesity (Zepbound), T2D (Mounjaro) |
| Cardiovascular data | SELECT trial: 20% CV risk reduction | SURMOUNT-MMO: ongoing |
| Side effect profile | Nausea, GI effects (common early) | Similar GI effects, often milder |
| Good for plateaus | Starting point for most patients | Often used after sema plateau |
Who Is a Better Candidate for Each?
Semaglutide May Be the Better Starting Point If:
You are new to GLP-1 therapy and want to start with the more established option
You have strong cardiovascular risk factors (SELECT trial data is robust)
You are sensitive to GI side effects and want to titrate conservatively
Cost is a primary concern (compounded semaglutide is widely available)
Tirzepatide May Be the Better Choice If:
You have been on semaglutide and have plateaued
You have type 2 diabetes or significant insulin resistance
You want to maximize total weight loss potential
You tolerated semaglutide well and are ready for a more potent option
The right choice depends on your labs, your health history, your previous medication experience, and your goals. This is exactly the kind of decision that should be made with a provider — not based on a social media recommendation or a friend's experience.
GLP-1 Therapy · Orlando & Kissimmee
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