Medically reviewed by Dr. Diala Alatassi, board-certified obesity medicine physician
Zepbound and Wegovy are two of the best-known prescription weight loss injections. Both are FDA-approved for chronic weight management, both are given once a week, and both are made by well-known drug companies. But they are not the same medicine, and the differences matter. This guide explains how they compare so you can have an informed talk with a clinician.
The short answer
- Zepbound contains tirzepatide, which activates two gut hormone receptors: GIP and GLP-1.
- Wegovy contains semaglutide, which activates the GLP-1 receptor.
- In a head-to-head trial, people taking tirzepatide lost more weight on average than those taking semaglutide.
- Neither is “better” for every person. The best choice depends on your health, your insurance, your side effects and cost.
How they work
Both medicines mimic hormones released after eating. They slow how fast food leaves the stomach, reduce appetite, and help you feel full sooner. Tirzepatide adds a second hormone target, GIP, which may add to its effect on appetite and metabolism. Read more about GLP-1 medications.
Weight loss results
| Zepbound (tirzepatide) | Wegovy (semaglutide) | |
|---|---|---|
| Average weight loss in main trials | About 15 to 21 percent, depending on dose, over 72 weeks | About 15 percent over 68 weeks |
| Head-to-head trial (72 weeks) | About 20 percent | About 14 percent |
| Dosing | Weekly injection, starts at 2.5 mg and rises in steps to 5, 10 or 15 mg | Weekly injection, starts at 0.25 mg and rises to 1.7 or 2.4 mg |
| FDA approval | Chronic weight management; sleep apnea in adults with obesity | Chronic weight management; lowering heart risk in adults with heart disease and excess weight |
These are averages. Some people lose more and some lose less. Results depend on dose, diet, activity, sleep, other medicines and how long you stay on treatment.
Side effects
The side effects are similar because both drugs act on the same gut hormone pathway:
- Nausea, vomiting, diarrhea and constipation, most common when starting or raising the dose
- Stomach pain, bloating and reflux
- Fatigue or dizziness, often related to eating too little or drinking too little
- Rare but serious risks include pancreatitis, gallbladder problems and kidney injury from dehydration
Both carry a boxed warning about thyroid C-cell tumors seen in animal studies. They are not for people with a personal or family history of medullary thyroid carcinoma or with MEN 2. Your clinician will ask about this.
Tips to reduce side effects: eat smaller meals, stop when you feel full, limit greasy and very sweet foods, drink water, and increase the dose only when you are ready.
Which might suit you?
A clinician may lean toward tirzepatide (Zepbound) if:
- You need a larger amount of weight loss for health reasons
- You have obstructive sleep apnea
- You have not had enough response to semaglutide
A clinician may lean toward semaglutide (Wegovy) if:
- You have known heart disease and want a medicine with a heart-risk indication
- Your insurance covers it and not the alternative
- You prefer a medicine with a longer track record
These are general patterns, not rules. Coverage, availability and your own medical history often decide the choice.
Cost and access
Insurance coverage for weight loss medication varies widely. Some plans cover one of the two and not the other, and some cover neither. Manufacturer cash programs also change over time. At TeleSlim Clinic, the $99 fee covers your consultation and follow-ups, and medication cash pricing generally falls between $150 and $450 depending on the medication and dose. If your plan covers weight loss medication, insurance may help with medication cost.
Prescriptions are sent to the pharmacy you choose. If a pharmacy is out of stock, your clinician can help with alternatives. We do not use compounded medications. Learn about the full medication list and read our guide to the best weight loss injection in Houston.
What if neither is right?
Other options include liraglutide (Saxenda), phentermine, phentermine-topiramate (Qsymia), naltrexone-bupropion (Contrave), orlistat and metformin for selected patients. Your clinician can explain how these compare to injections.
Frequently asked questions
Is Zepbound stronger than Wegovy? In the head-to-head trial, tirzepatide led to more average weight loss than semaglutide. “Stronger” also means more side effect risk for some people, so the best medicine is the one you can tolerate and stay on.
Can I switch from one to the other? Sometimes. A clinician can advise how to do it safely and which dose to start with.
Can I take them together? No. They should not be combined.
How long do I have to take them? These are chronic treatments. Many people regain weight after stopping, so plan for long-term use or a maintenance strategy with your clinician.
Talk with a Houston clinician online
If you are deciding between Zepbound and Wegovy, book a free consult to review your options by video. You can also read about Dr. Alatassi or contact the clinic.
This article is for general education and does not replace medical advice. Prescription weight loss medications have risks and are not right for everyone.
