Semaglutide vs Tirzepatide: How Wegovy and Zepbound Compare
Semaglutide and tirzepatide are both weekly injectable medications that help with chronic weight management. Semaglutide is a GLP-1 receptor agonist, while tirzepatide targets both GLP-1 and GIP receptors. While both are highly effective, clinical trials suggest tirzepatide may lead to slightly more weight loss on average.
- Wegovy is the brand name for semaglutide approved for weight loss.
- Zepbound is the brand name for tirzepatide approved for weight loss.
- Both medications are once-weekly injections.
- Gastrointestinal side effects are common with both drugs.
- Insurance coverage and prior authorization play a major role in which drug a patient uses.
What are semaglutide and tirzepatide?
Semaglutide and tirzepatide are active ingredients in a newer class of medications. These drugs help regulate appetite and blood sugar. They are approved by the FDA for different uses under specific brand names.
Semaglutide is the active ingredient in Wegovy and Ozempic. Wegovy is FDA-approved for chronic weight management. Ozempic is FDA-approved for treating type 2 diabetes. While both contain the same drug, they are prescribed and dosed differently depending on the patient's diagnosis.
Tirzepatide is the active ingredient in Zepbound and Mounjaro. Zepbound is FDA-approved for chronic weight management. Mounjaro is FDA-approved for treating type 2 diabetes. Like semaglutide, the brand name your doctor prescribes depends on your medical condition.
How do these medications work?
Both drugs mimic hormones naturally produced in your body. These hormones signal your brain that you are full. They also slow down how quickly your stomach empties. This combination helps you feel satisfied with smaller amounts of food.
Semaglutide is a single-receptor agonist. It mimics the GLP-1 hormone. GLP-1 targets areas of the brain that regulate appetite and food intake.
Tirzepatide is a dual-receptor agonist. It mimics both the GLP-1 and GIP hormones. GIP is another hormone involved in digestion and blood sugar control. The addition of GIP action may explain why tirzepatide has shown slightly different results in clinical trials.
Comparing weight loss results
Large clinical trials have studied both medications. These trials provide the best evidence for how well they work on average. Individual results will always vary.
The STEP 1 trial studied semaglutide. Patients taking the highest dose (2.4 mg) lost an average of about 15% of their body weight over 68 weeks. This trial included diet and exercise counseling.
The SURMOUNT-1 trial studied tirzepatide. Patients taking the highest dose lost an average of up to 20% of their body weight over 72 weeks. This trial also included lifestyle interventions.
A recent head-to-head trial called SURMOUNT-5 directly compared the two drugs. This study found that patients taking tirzepatide lost an average of about 20% of their body weight, compared to about 14% for those taking semaglutide. While both drugs are highly effective, tirzepatide may offer an edge in total weight loss for some patients.
Side effects and safety
The side effects of semaglutide and tirzepatide are very similar. The most common issues are gastrointestinal. These include nausea, vomiting, diarrhea, constipation, and stomach pain.
These side effects usually happen when you start the medication or increase the dose. Most people find that the symptoms improve over time. Your physician will slowly increase your dose to help manage these side effects.
Both medications carry serious warnings. The FDA requires a boxed warning about a risk of thyroid C-cell tumors, including medullary thyroid carcinoma. People with a personal or family history of this type of thyroid cancer, or those with Multiple Endocrine Neoplasia syndrome type 2 (MEN2), should not use these drugs. There is also a risk of inflammation of the pancreas (pancreatitis).
Choosing between Wegovy and Zepbound
Deciding which medication is right for you involves a detailed conversation with your doctor. Efficacy is just one part of the equation.
Your medical history is a key factor. Your doctor will review your past health and current medications to ensure the drug is safe for you. How you tolerate the medication is also important. If you experience severe side effects on one drug, your doctor might suggest switching to the other.
Cost and insurance coverage often dictate the final choice. These medications are expensive when paid for out of pocket. Insurance coverage for weight loss medications varies widely between plans. Prior authorization is almost always required. Some plans may cover one drug but not the other.
Medical weight management at Éblouissant
At Éblouissant, Dr. Pandey offers comprehensive medical weight management. An initial consultation takes 30 to 45 minutes. This visit includes a thorough physician evaluation.
Dr. Pandey will order metabolic and thyroid blood work to assess your overall health. Nutrition counseling is a core part of the program. When clinically appropriate, Dr. Pandey may prescribe FDA-approved medications like Wegovy or Zepbound.
We understand that navigating insurance can be frustrating. Our team can help with prior authorization requests when appropriate, though coverage is never guaranteed. If you are interested in exploring these options, you can schedule an appointment by calling (212) 964-0971 or booking online.
Common questions
Can I switch from semaglutide to tirzepatide?
Yes, it is possible to switch between these medications. Your doctor will guide you on how to safely transition from one drug to the other. You should never stop or change your medication without consulting your physician.
Are Ozempic and Mounjaro approved for weight loss?
No. Ozempic and Mounjaro are FDA-approved to treat type 2 diabetes. Wegovy and Zepbound are the versions of those drugs approved for chronic weight management.
How long do I need to take these medications?
Obesity is a chronic condition. These medications are designed for long-term use. If you stop taking the medication, you are likely to regain the weight you lost. Your doctor will discuss a long-term treatment plan with you.
What happens if I miss a dose?
If you miss a dose, contact your doctor or pharmacist for advice. If you miss a dose, ask your doctor or pharmacist what to do. The instructions for a missed dose depend on how many days it has been since your last scheduled injection.
Medical Weight Loss & GLP-1
See pricing, what to expect, and how to book on our Medical Weight Loss & GLP-1 page.
Related reading
This article is general information, not medical advice, and does not create a doctor-patient relationship. Individual results vary. If you have a medical emergency, call 911. Medical disclaimer