GLP-1 Drugs Comparison: Ozempic, Wegovy, Mounjaro, Zepbound and More

If you’ve been researching weight loss medications or managing type 2 diabetes, you’ve probably heard of GLP-1 drugs. Names like Ozempic, Wegovy, Mounjaro, and Zepbound seem to be everywhere—from news headlines to social media to conversations at the doctor’s office.

But with so many options available, how do you know which one might be right for you? In this guide, we’ll break down the differences between GLP-1 medications in plain language, comparing how they work, their effectiveness, side effects, and what makes each one unique.

What Are GLP-1 Medications?

GLP-1 stands for glucagon-like peptide-1, which is a hormone your body naturally produces in your gut after you eat. Think of it as your body’s built-in appetite manager—it tells your brain you’re full, slows down digestion so you feel satisfied longer, and helps regulate blood sugar levels.

GLP-1 medications (also called GLP-1 receptor agonists or GLP-1 RAs) work by mimicking this natural hormone, but in a much more powerful and longer-lasting way. The result? Better blood sugar control, reduced appetite, and significant weight loss for many people.

The FDA first approved a GLP-1 medication in 2005 for type 2 diabetes. Since then, newer versions have been developed that are more effective and easier to use—some requiring only one injection per week, and there’s now even a daily pill option.

GLP-1 Medications at a Glance

Here’s a quick comparison of the most popular GLP-1 medications currently available:

Semaglutide: Ozempic, Wegovy, and Rybelsus

Semaglutide is currently one of the most well-known GLP-1 medications, and it comes in three different brand names depending on the purpose and how you take it.

Ozempic

Ozempic is FDA-approved specifically for type 2 diabetes. It’s a once-weekly injection that helps control blood sugar and has also been shown to reduce the risk of heart attack, stroke, and cardiovascular death in people with heart disease. While many people lose weight on Ozempic, weight loss isn’t its official approved use.

Wegovy

Wegovy contains the same medication as Ozempic but at a higher dose, and it’s specifically approved for weight loss and chronic weight management. In clinical trials, people taking Wegovy lost an average of about 15% of their body weight. As of early 2026, Wegovy is also available as a once-daily pill, which lost about 13% in trials—slightly less than the injection but still significant.

Rybelsus

Rybelsus is the pill form of semaglutide approved for type 2 diabetes. It’s taken once daily on an empty stomach with a small sip of water. While convenient for those who prefer not to inject, it typically shows somewhat lower weight loss results compared to the injectable versions.

Tirzepatide: Mounjaro and Zepbound

Tirzepatide is the newest breakthrough in this medication class. What makes it different? While semaglutide mimics one hormone (GLP-1), tirzepatide mimics two hormones: GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). Think of it as a “dual-action” approach that appears to be even more effective.

Mounjaro

Mounjaro is approved for type 2 diabetes and is taken as a once-weekly injection. In clinical trials, it showed impressive results for both blood sugar control and weight loss, though weight loss isn’t its official approved use.

Zepbound

Zepbound is the same medication as Mounjaro but specifically approved for weight loss and chronic weight management. It’s also the first GLP-1 medication approved to treat obstructive sleep apnea in adults with obesity. In studies, patients on the highest dose lost an average of 21% of their body weight over 72 weeks—making it currently the most effective FDA-approved weight loss medication available. For a detailed head-to-head breakdown, see our Zepbound vs Ozempic comparison.

Older GLP-1 Options: Saxenda, Victoza, and Trulicity

Before semaglutide and tirzepatide, there were other GLP-1 medications that are still available and may work well for some people.

• Saxenda (liraglutide) is approved for weight loss but requires daily injections. It’s now available as a generic, making it more affordable for some patients.
• Victoza (liraglutide) is the diabetes version of liraglutide, also taken as a daily injection.
• Trulicity (dulaglutide) is a once-weekly injection for diabetes that’s been around since 2014. While it does help with weight loss, the results are typically more modest than newer options.

For a comprehensive look at all available options including non-GLP-1 alternatives, check out our guide to the best weight loss pills available in 2026.

Side Effects: What to Expect

All GLP-1 medications share similar side effects because they work in similar ways. The most common side effects affect your digestive system:

• Nausea (the most common, especially when starting)
• Vomiting
• Diarrhea
• Constipation
• Stomach pain
• Sulfur burps (particularly with semaglutide products)

The good news? These side effects are usually temporary and tend to improve as your body adjusts. Starting at a low dose and gradually increasing (called “titration”) helps minimize these effects. Most doctors increase your dose slowly over several weeks or months.

Serious Side Effects (Rare)

While uncommon, there are more serious risks to be aware of:

• Pancreatitis (inflammation of the pancreas)
• Gallbladder problems
• Kidney issues
• In animal studies, thyroid tumors were observed—these medications should not be used by people with a personal or family history of medullary thyroid cancer or MEN 2 syndrome

Which GLP-1 Medication Is Best for You?

There’s no single “best” GLP-1 medication—the right choice depends on your individual situation. Here are some factors to consider:

• Your primary goal: If your main concern is weight loss, Zepbound (tirzepatide) currently shows the best results in clinical trials. If you’re managing type 2 diabetes, several options are available depending on your other health conditions.
• Insurance coverage: Coverage varies widely. Some plans cover Ozempic for diabetes but not Wegovy for weight loss. Check with your insurance about what’s covered under your specific plan.
• Injection vs. pill: If needles make you anxious, the Wegovy pill or Rybelsus might be good options. Keep in mind that injectable versions tend to be more effective for weight loss.
• Cost: Without insurance, these medications can cost $1,000 or more per month. Generic liraglutide (Saxenda) may be a more affordable option for some people.
• Other health conditions: If you have heart disease, certain GLP-1s like Ozempic and Wegovy have been shown to reduce cardiovascular risk. If you have sleep apnea, Zepbound is specifically approved for that condition.

What’s Coming Next in GLP-1 Medications?

The world of GLP-1 medications continues to evolve rapidly. Here are some developments to watch:

• Retatrutide: This “triple agonist” from Eli Lilly targets three hormones (GLP-1, GIP, and glucagon) and showed average weight loss of 24% in early trials. Phase 3 results are expected in late 2025 or early 2026. Learn more in our Retatrutide vs Tirzepatide comparison.
• More oral options: Eli Lilly is developing orforglipron, an oral GLP-1 that can be taken with or without food—unlike current pills that require an empty stomach.
• Generic versions: Generic liraglutide is now available, and as patents expire on other medications, more affordable options may become available.

Be cautious of products that claim to offer GLP-1 benefits without a prescription. Our article on GLP-1 patches investigates which alternative delivery methods are real and which are scams.

Frequently Asked Questions

The Bottom Line

GLP-1 medications represent a significant advancement in treating both type 2 diabetes and obesity. While tirzepatide (Zepbound/Mounjaro) currently shows the most impressive weight loss results, the “best” medication for you depends on your health goals, insurance coverage, tolerance of side effects, and personal preferences. Talk with your healthcare provider to discuss your options and find the right fit for your weight loss journey.