Semaglutide and tirzepatide are the two most talked-about weight loss medications today. They're similar, but not the same, and the difference matters when choosing the right one for you.
What they have in common
Both are prescription medications, usually given as a once-weekly injection, that help regulate appetite, blood sugar, and metabolism. Both were first developed to treat type 2 diabetes and are now also used for weight management.
Both work by acting like natural hormones your gut releases after you eat. That helps you:
- Feel full sooner and stay full longer
- Experience fewer cravings and less "food noise"
- Improve blood sugar control and insulin sensitivity
Semaglutide
Semaglutide acts on one hormone pathway: GLP-1 (glucagon-like peptide-1). It's the active ingredient in brand-name medications such as Wegovy and Ozempic.
In its major clinical trial for weight loss, people taking semaglutide alongside lifestyle changes lost about 15% of their body weight on average over about a year and a half.
Tirzepatide
Tirzepatide is newer and acts on two hormone pathways: GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). It's the active ingredient in brand-name medications such as Zepbound and Mounjaro.
In its major clinical trial, people on the highest dose lost about 20% of their body weight on average over about a year and a half. In a head-to-head study, tirzepatide produced more weight loss than semaglutide on average.
So is tirzepatide always better?
Not necessarily. Averages don't tell you how your body will respond. Some people do very well on semaglutide, and some tolerate one medication better than the other. Your provider looks at your health history, goals, other medications, and how you respond to choose the right option and dose.
Side effects
The most common side effects for both are digestive: nausea, diarrhea, constipation, and occasional vomiting. They're usually strongest when you first start or increase your dose. That's why both medications start at a low dose and increase gradually.
Less common but more serious risks include pancreatitis and gallbladder problems. Neither medication is recommended for people with a personal or family history of medullary thyroid cancer or MEN2, or during pregnancy. Your provider screens for all of this before prescribing.
Who is a good candidate?
You may be a candidate if you have a BMI over 30, or a BMI over 27 with weight-related health concerns, and have struggled with traditional weight loss methods. Every patient completes a medical evaluation first.
Medication is one part of the plan
The best results come from combining medication with nutrition guidance, staying active, and protecting muscle as you lose weight. Our program includes ongoing provider oversight, dosage adjustments, and peptide and hormone support when appropriate. Care is available by telehealth with medication shipped to your home in all 50 states. Learn about our GLP-1 program.
Medically supervised weight loss
This article is general information, not medical advice. Results vary. GLP-1 medications are prescribed only when medically appropriate, after an evaluation by a licensed provider.
