Saxenda, Wegovy or Mounjaro: Daily vs. Weekly?
Saxenda is injected daily, Wegovy and Mounjaro weekly, and Mounjaro acts on two gut hormones. See how long each takes to reach its target dose, what head-to-head studies found and when side effects need care.
Saxenda is injected once a day, while Wegovy and Mounjaro are injected once a week. Saxenda (liraglutide) and Wegovy (semaglutide) act like one gut hormone, GLP-1, and Mounjaro (tirzepatide) acts on two, GLP-1 and GIP. So when you compare them, look at how often you inject, how many weeks it takes to reach the target dose and how well you handle stomach upset along the way.
A weekly shot still starts low and is raised step by step, so it's easier on your calendar but not faster to the full dose. In this article, we'll cover how the schedules differ, what the second hormone adds, what head-to-head studies found, which side effects need care and how to decide what to ask about first.
Quick summary
- Saxenda is daily, Wegovy and Mounjaro are weekly, and Mounjaro acts on two hormones instead of one.
- Ramp-up time: in the trial that compared them, Saxenda reached its target dose over 4 weeks and Wegovy over 16 weeks.
- Over 68 weeks, adults without diabetes lost 15.8% of their weight on average with Wegovy and 6.4% with Saxenda.
- Common discomfort: nausea and diarrhea are common with all three injections.
Saxenda vs. Mounjaro: What Changes With a Daily or Weekly Shot?
If remembering an injection at the same time every day sounds hard, a weekly shot is easier to keep on schedule. That's the main day-to-day difference between Saxenda and the other two.
Keep in mind that none of the three starts at the target dose. The dose is raised in steps over several weeks, and nausea tends to show up during that stretch. That's why the pace is adjusted to how your body is handling it.
| Saxenda | Wegovy | Mounjaro | |
|---|---|---|---|
| Ingredient | Liraglutide | Semaglutide | Tirzepatide |
| Hormones it acts on | GLP-1 | GLP-1 | GLP-1 and GIP |
| How often | Once a day | Once a week | Once a week |
| Target dose | 3.0 mg | 2.4 mg | 5, 10 or 15 mg |
| Weeks to reach it | 4 weeks | 16 weeks | 4 to 20 weeks |
Use the table to sort by routine first, then by how many weeks of ramp-up you're willing to plan for.
All three are meant to be used together with changes in diet and exercise. The Saxenda and Wegovy figures come from the dosing plan of a trial that compared the two directly. The Mounjaro figures are the doses set for its ingredient when it was approved for weight management in the US*.
*Based on US FDA approval information for tirzepatide (sold as Zepbound for weight management).
What Does Mounjaro Do That Saxenda and Wegovy Don't?
Mounjaro acts on the receptors for two gut hormones at once, GLP-1 and GIP*, while Saxenda and Wegovy act on GLP-1 alone. When you eat, your gut releases these hormones to signal fullness and help control blood sugar. Acting on them lowers your appetite and how much you eat.
*GIP: a hormone your gut releases after you eat. It helps your body release insulin.
Because they share the same GLP-1 action, Saxenda and Wegovy are easiest to understand as one family with two versions. They differ in ingredient and in how far apart the doses are.
That said, acting on two hormones doesn't make Mounjaro the better fit for everyone. If stomach symptoms are already a problem for you, the pace of dose increases matters more. So I look at how your stomach is doing now before I look at the ingredient.
How Much Weight Did People Lose in Head-to-Head Studies?
I haven't found a trial that put all three side by side, but pairs of them have been compared directly. In one study, 338 adults with obesity or overweight and no diabetes were treated for 68 weeks. Average weight loss was 15.8% with Wegovy, 6.4% with Saxenda and 1.9% with a placebo (a dummy shot).
More people stopped early on Saxenda (27.6%) than on Wegovy (13.5%). That gap matters if you're worried about sticking with a daily routine for more than a year.
A second study followed 751 adults without diabetes for 72 weeks. Average weight loss was 20.2% with Mounjaro's ingredient and 13.7% with Wegovy's ingredient.
In both studies, the participants knew which drug they were getting, which is a limitation. These numbers are averages, so they can't tell you how much you'll lose. Results differ from person to person.
Saxenda, Wegovy and Mounjaro Side Effects: When Do You Need Care?
Nausea, diarrhea, vomiting, constipation and stomach discomfort are common with all three. Over 68 weeks, 84.1% of people on Wegovy and 82.7% on Saxenda had stomach or bowel symptoms. Mounjaro's ingredient showed the same pattern against Wegovy's: these were the most common side effects, mostly mild to moderate, and they appeared mainly while the dose was being raised.
If diarrhea or vomiting keeps going, your body can lose too much fluid, so drink plenty of water. Don't wait on the signs below. Get medical care right away*:
- Severe stomach pain that won't go away, sometimes spreading to your back, with or without vomiting
- Pain in your upper stomach with fever, yellowing of your skin or the whites of your eyes, or clay-colored stools
- A lump or swelling in your neck, hoarseness, trouble swallowing or shortness of breath
- Diarrhea or vomiting that keeps going, with less urine and dizziness
Stomach pain like this can be a sign of pancreatitis, yellowing with fever can point to a gallbladder problem, and a neck lump can be a sign of a thyroid tumor. A message to the clinic doesn't replace that care.
*Based on the US FDA prescribing information for tirzepatide. The wording for Wegovy and Saxenda may differ.
It's better to hold off on starting, or talk through other options, in these cases:
- You or a family member has had medullary thyroid cancer, or you have multiple endocrine neoplasia type 2 (MEN 2)
- You're pregnant or find out you're pregnant
- You've had a serious allergic reaction to the ingredient before
Saxenda or a Weekly Shot: Which Should You Ask About First?
If a daily injection feels like a burden, start the conversation with a weekly shot. If stomach upset is your biggest worry, start with a plan that takes longer to reach the target dose.
At the visit, I check your height and weight, the medicines you take and any family history of thyroid disease before deciding whether to prescribe. Bring a list of anything you've used for weight loss before, including the dose and how long you used it.
When you get a quote, check that it names the drug, the target dose in mg and how many weeks it covers. The total cost depends on the target dose and how long you stay on it, even for the same drug.
Fitting Weight-Loss Injections Into a Trip to Seoul
Unless you've had sedation that day, there's no need to postpone your flight because of a weight-loss injection consultation or prescription.
One visit is the start of a plan that runs for weeks. The dose is raised step by step over several weeks, so your first visit sets the starting dose and the schedule rather than delivering a change you'll see before you leave. How much changes, and how fast, differs from person to person.
Once you're home, you can send your questions, with photos if they help, through the consultation button on this page. If you have severe stomach pain, yellowing of your skin or eyes, or a lump in your neck, see a local doctor first rather than waiting for a reply.
The Bottom Line: Ask for the Target Dose and the Weeks
The variable to carry into your consultation is the ramp-up: the target dose and the number of weeks it takes to get there. Ask, "What dose would I start on, and how many weeks until I reach the target?" That answer tells you more about how your first months will feel than the injection day does.
If you're weighing a daily shot against a weekly one, a consultation is where you can find out which plan fits your routine and your stomach. Beautystone is a clinic in Seoul's Hapjeong area. When you reach out, include your height and weight, the medicines you take and any family history of thyroid disease.
Sources
- Daily liraglutide vs. weekly semaglutide over 68 weeks in adults without diabetes (JAMA, 2022)
- Tirzepatide vs. semaglutide over 72 weeks in adults with obesity (N Engl J Med, 2025)
- How tirzepatide works and its doses for weight management (US FDA)
- Tirzepatide warnings, missed doses and birth control pills (US prescribing information, DailyMed)
Frequently Asked Questions
Q. Can I take Mounjaro and Wegovy together?
A. No. Mounjaro's ingredient isn't used together with other GLP-1 drugs, and Wegovy and Saxenda are both GLP-1 drugs, so the injections aren't combined. If you want to switch, when to stop one and when to start the other is decided at your visit.
Q. What if I miss a weekly Mounjaro dose?
A. For Mounjaro's ingredient, take the missed dose as soon as you remember if it's within 4 days (96 hours). If more than 4 days have passed, skip that dose and take the next one on your usual day. Keep at least 3 days (72 hours) between two doses.
Q. Does Mounjaro make birth control pills less effective?
A. It can. Mounjaro's ingredient slows how fast your stomach empties, which can lower the effect of birth control pills. For 4 weeks after starting, and for 4 weeks after each dose increase, switch to or add a non-pill method. Mention the birth control you use at your consultation.
Q. Why does Wegovy take 16 weeks to reach the full dose?
A. In the trial comparing it with Saxenda, Wegovy was raised step by step over 16 weeks to 2.4 mg. Stomach symptoms tend to appear while the dose is being raised, and participants who couldn't tolerate 2.4 mg stayed at 1.7 mg.
Q. Saxenda vs. Wegovy: can I switch if Saxenda isn't working well?
A. Saxenda and Wegovy belong to the same GLP-1 family, so switching is one option. When to switch and what dose to start on depend on how you've responded so far and on your stomach symptoms, and they're decided at your visit. Bring a note of the doses you've used and for how long.
Q. Will I gain the weight back after I stop the injections?
A. All three were studied alongside changes in diet and exercise. Once you stop, the effect that lowered your appetite stops too, so it helps to plan how you'll keep up those habits. When to stop is also something to decide with your doctor.
Q. Can I get these weight-loss injections without diabetes?
A. Yes, the two comparison studies in this article both included only adults without diabetes. In the US, tirzepatide for weight management is approved for adults with a BMI of 30 or more, or 27 or more with a weight-related condition such as high blood pressure. Whether a prescription fits you is checked at your visit.
