Walk into any pharmacy or scroll through any weight-loss forum and you'll see the same names: Ozempic, Wegovy, Mounjaro. They're all GLP-1 medications, but they're not interchangeable. Here's how they differ—and what that might mean for you.

Ozempic vs Wegovy: Same Drug, Different Indications

Ozempic and Wegovy are both semaglutide. Same molecule, same manufacturer (Novo Nordisk). The difference is FDA approval and dosing.

Ozempic is approved for type 2 diabetes. The maximum dose tops out at 2 mg per week. Wegovy is approved specifically for obesity and goes up to 2.4 mg. These are standard maximum doses from prescribing information; your doctor may use a different plan for your situation. Some doctors prescribe Ozempic off-label for weight loss when Wegovy isn't covered or available, but the higher dose in Wegovy is what the obesity trials used.

Insurance often treats them differently. Ozempic might be covered with a diabetes diagnosis; Wegovy may require a BMI threshold and proof you've tried other approaches. It's worth checking your plan before you get your heart set on one.

Mounjaro (Tirzepatide): The Dual-Hormone Option

Mounjaro is tirzepatide—and it's a bit of an upgrade on the hormone front. It targets both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). That second hormone seems to add extra punch for weight loss.

In head-to-head trials, tirzepatide has generally led to more weight loss than semaglutide. We're talking a few extra percentage points on average—not night and day, but noticeable. Mounjaro is approved for diabetes; its sibling Zepbound has the official weight-loss indication.

Tirzepatide has a shorter half-life (about 5 days) compared to semaglutide (about 7 days). Both are once-weekly shots, so that mostly matters for how quickly the drug builds up and clears your system if you stop.

Which GLP-1 Medication Is Best for Weight Loss?

There's no single "best" answer. Tirzepatide tends to produce slightly more weight loss in trials, but semaglutide has a longer track record and more real-world data. Some people respond better to one than the other. Side effects vary by person too.

Practical factors often matter more: What does your insurance cover? What can you afford out of pocket? Is your doctor comfortable managing one over the other? Availability has been a problem—supply shortages have hit both brands over the past year.

If you're already on one and tracking your progress, tools like our GLP-1 dosage calculator can help you see how drug accumulation builds over time and what a typical weight trajectory might look like. It's useful for setting realistic expectations.

The Rest of the GLP-1 Meds

Beyond those three, you've got Victoza (liraglutide), a daily injectable that's older and usually produces less weight loss. Trulicity (dulaglutide) is another weekly option, approved for diabetes; it's not specifically indicated for obesity.

Rybelsus is the oral version of semaglutide. Daily pill, lower max dose. Handy if you really don't want injections, but the weight loss numbers in studies haven't matched Wegovy's.

Takeaway

Ozempic, Wegovy, and Mounjaro are the heavy hitters right now. Semaglutide and tirzepatide both work—tirzepatide edges ahead on average weight loss, but your results will depend on your body, your dose, and how long you stick with it. Talk to your doctor about which GLP-1 drug makes sense for your situation, and don't forget to factor in cost and coverage.