Blog · Weight Loss
Liraglutide vs semaglutide is a common question from people who tried Saxenda, heard about Wegovy, and wonder whether the weekly medicine is worth a look. Others simply want to know why one is daily and the other weekly. Below, Dr. Melanie Espinet explains the difference between semaglutide and liraglutide, the STEP 8 trial that compared them head to head for weight loss, how the doses work, the side effects, and what to ask your doctor. For the basics of how this family of medicines works, start with what GLP-1 is and how it works.
Both are GLP-1 receptor agonists. They mimic GLP-1, a natural hormone that acts on the parts of the brain that regulate appetite and how much you eat. Both are built to closely resemble your own GLP-1. The Saxenda label says liraglutide shares 97 percent of its amino acid sequence with human GLP-1, and the Wegovy label puts semaglutide at 94 percent.
The biggest practical difference is how long each one stays active in your body. Your own GLP-1 has a half-life of only about 1.5 to 2 minutes. Liraglutide has a half-life of about 13 hours, which suits a once-daily shot. Semaglutide has a half-life of about one week, which suits a once-weekly shot. Liraglutide is also the older medicine: its first U.S. approval came in 2010, and semaglutide’s in 2017.
| Brand | Medicine, schedule and main U.S. label use |
|---|---|
| Saxenda | Liraglutide, once daily. Long-term weight management in adults and children 12 and older who have obesity and weigh more than 60 kg (about 132 pounds), and in adults with overweight plus a weight-related condition |
| Victoza | Liraglutide, once daily at lower doses. Blood sugar control in type 2 diabetes for adults and children 10 and older, plus heart risk reduction in some adults |
| Wegovy | Semaglutide, once weekly. Long-term weight management in adults, and in children 12 and older with obesity, plus heart risk reduction and a liver condition (MASH) in some adults |
| Ozempic | Semaglutide, once weekly. Blood sugar control in adults with type 2 diabetes, plus heart and kidney risk reduction in some |
So Saxenda vs Wegovy is the weight-management version of the same comparison. If you’re sorting out the two semaglutide brands, our guide to Wegovy vs Ozempic covers how they differ.
STEP 8 compared the two medicines directly. It ran at 19 U.S. sites and enrolled 338 adults with a BMI of 30 or more, or 27 or more with at least one weight-related condition, who did not have diabetes. They took weekly semaglutide 2.4 mg, daily liraglutide 3.0 mg, or a matching placebo for 68 weeks. Everyone also got diet and physical activity counseling.
| Result at 68 weeks | Semaglutide weekly vs liraglutide daily |
|---|---|
| Average change in body weight | 15.8% loss vs 6.4% loss (placebo: 1.9% loss) |
| Lost 10% or more of body weight | 70.9% vs 25.6% of people |
| Lost 15% or more | 55.6% vs 12.0% of people |
| Lost 20% or more | 38.5% vs 6.0% of people |
| Stopped treatment for any reason | 13.5% vs 27.6% of people |
| Reported stomach side effects | 84.1% vs 82.7% of people |
In plain terms, people on weekly semaglutide lost about two and a half times as much weight on average, and far more of them reached 10, 15 or 20 percent loss. Stomach side effects were about as common with both. About twice as many people stopped liraglutide before the end.
It is one trial of 338 people, most of them women, and none with diabetes. The two active medicines were compared open label, so people knew which one they were taking. Several authors worked for Novo Nordisk, which makes both medicines. The rules also differed. Semaglutide was raised over 16 weeks and liraglutide over 4. People who couldn’t handle the full semaglutide dose could drop to 1.7 mg, while people who couldn’t handle full-dose liraglutide stopped it. Side effects led 12.6 percent of people on liraglutide to stop, compared with 3.2 percent on semaglutide, and half of those liraglutide stops were stomach-related, mostly during dose increases. The authors suggest reasons for the gap but didn’t test them. Averages describe groups, not you.
| Dosing detail | Saxenda (liraglutide) | Wegovy (semaglutide) |
|---|---|---|
| How often | Once a day | Once a week |
| Starting dose | 0.6 mg a day for one week | 0.25 mg a week for four weeks |
| How the dose rises | Up 0.6 mg each week | Up one step every four weeks |
| Maintenance dose | 3 mg a day from week 5 | 2.4 mg a week (or 1.7 mg) from week 17 |
| Highest labeled dose | 3 mg a day | 7.2 mg a week for some adults |
| Shots in a year | About 365 | 52 |
| After missed doses | Restart at 0.6 mg if more than 3 days pass | Restart lower if 2 or more weekly doses in a row are missed |
The Saxenda label adds an early checkpoint for adults. Weight is checked 16 weeks after starting, and Saxenda is stopped if you haven’t lost at least 4 percent of your starting weight, because meaningful weight loss is unlikely with more time. The Wegovy label doesn’t set a matching early cutoff. With both, the dose climbs slowly to lower the risk of stomach side effects.
The milligram numbers can’t be compared across the two medicines. A daily liraglutide dose and a weekly semaglutide dose are different drugs on different schedules, so 3 mg of one tells you nothing about the other.
Because both act on the same receptor, their side effects look alike. Stomach symptoms lead the list for both: nausea, diarrhea, constipation and vomiting. In STEP 8, stomach side effects were reported by 84.1 percent of people on semaglutide and 82.7 percent on liraglutide. The Saxenda label’s common list also includes injection site reactions, headache, low blood sugar, indigestion, fatigue, dizziness and stomach pain.
The serious warnings overlap almost completely. Both labels carry a boxed warning about thyroid C-cell tumors seen in rodents, and neither medicine is used by people with a personal or family history of medullary thyroid cancer or MEN 2. Both list pancreatitis, gallbladder disease, low blood sugar with insulin or a sulfonylurea, a faster heart rate, kidney injury from dehydration, severe stomach side effects, and risks during anesthesia or deep sedation. For more on what’s common and how to manage it, see semaglutide side effects.
For many people, the schedule is the deciding detail. A daily shot means about 365 injections a year, and a weekly shot about 52. Liraglutide’s shorter half-life also makes gaps matter more: the Saxenda label says to start over at the lowest dose if more than three days pass without one.
STEP 8 found that more people stopped liraglutide than semaglutide, but it didn’t test why. Some people find a weekly routine easier to keep, and others like a daily habit. Your doctor can help you weigh what fits your life, along with your health history and goals.
If you’ve taken Saxenda and want to try a weekly medicine, make that plan with your doctor. Both labels say not to combine their medicine with any other GLP-1 drug, so one stops before the other starts. The Wegovy label’s recommended starting dose is 0.25 mg a week, raised step by step, and your doctor decides the timing and the dose for you.
Bring what you know about your liraglutide: the dose you reached, how long you took it, your side effects and your results. The same planning applies to any move between GLP-1 medicines, which we cover in switching from semaglutide to tirzepatide. Tirzepatide, another weekly medicine, is compared with semaglutide in our semaglutide vs tirzepatide guide.
MeliOra offers semaglutide and tirzepatide, not liraglutide. Dr. Melanie Espinet, a board-certified family physician, evaluates, prescribes and follows every patient herself, includes lab work in your plan, and explains your medication at your visit. If you’ve taken liraglutide before, tell her how it went. It helps her plan your next step.
At MeliOra, semaglutide in Lutz is $150/month at starting doses and $240/month for higher dosing, and tirzepatide in Lutz is $230/month at starting doses and $320/month for higher dosing. Each monthly price includes physician visits, lab work, your medication and supplies, and dose adjustments and check-ins, with no consultation fee. MeliOra is a self-pay practice.
You can see Dr. Espinet through weight loss house calls across Tampa Bay, with no travel fee in our service area, at our Lutz office for select appointments, or by telehealth visit anywhere in Florida at the same monthly price.
This article is for education only and is not medical advice. Brand names are used only to explain what their U.S. labels say, and trial figures are published averages.
No, they are two different GLP-1 medicines, both made by Novo Nordisk. Liraglutide has a half-life of about 13 hours and is taken daily, while semaglutide has a half-life of about one week and is taken weekly. Both mimic the natural hormone GLP-1 to help regulate appetite.
Semaglutide led to more weight loss on average in the STEP 8 head-to-head trial: 15.8 percent of body weight versus 6.4 percent with liraglutide over 68 weeks, in adults without diabetes. Averages are not promises, and the best fit depends on your health history, side effects and how you respond.
No. Saxenda is liraglutide taken once a day, and Wegovy is semaglutide taken once a week. Both are Novo Nordisk brands labeled for long-term weight management along with diet and physical activity.
It can be an option, but only with your doctor’s plan. The two should not be taken together, and the Wegovy label starts at 0.25 mg a week and rises step by step, so your doctor decides when to switch and at what dose.
Because of their half-lives, a measure of how long each one stays active in the body. Liraglutide’s half-life is about 13 hours, and semaglutide’s is about one week, so semaglutide stays active long enough for a once-weekly dose.
Largely, yes. Stomach side effects are the most common with both, and in STEP 8 they were reported by about 84 percent of people on semaglutide and 83 percent on liraglutide. Both labels carry the same boxed warning about thyroid C-cell tumors.
No, MeliOra offers semaglutide and tirzepatide. Dr. Espinet prescribes semaglutide or tirzepatide when it is right for you and explains your medication at your visit, at your home across Tampa Bay, at our Lutz office for select appointments, or by video anywhere in Florida.
Serving Lutz, Wesley Chapel, Land O'Lakes, Carrollwood, New Tampa & greater Tampa Bay.
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