Semaglutide and liraglutide are both GLP-1 drugs. They work the same way but have important differences.
Quick Comparison
| Semaglutide | Liraglutide | |
|---|---|---|
| Drug class | GLP-1 agonist | GLP-1 agonist |
| Brand names | Ozempic, Wegovy, Rybelsus | Victoza, Saxenda |
| Dosing | Weekly injection or daily pill | Daily injection |
| FDA approvals | Diabetes, weight loss | Diabetes, weight loss |
| Makers | Novo Nordisk | Novo Nordisk |
| Year approved | 2017 (Ozempic) | 2010 (Victoza) |
How They Work
Both mimic the GLP-1 hormone to:
- Signal fullness to your brain
- Slow down digestion
- Help your body produce insulin when blood sugar is high
Semaglutide is newer and lasts longer in your body. That's why it can be taken once a week.
Liraglutide is older and breaks down faster. That's why it needs daily dosing.
Effectiveness
For diabetes (A1C reduction):
- Semaglutide: ~1.3-1.8% reduction
- Liraglutide: ~1.0-1.5% reduction
For weight loss:
- Semaglutide (Wegovy): ~15% body weight loss
- Liraglutide (Saxenda): ~5-8% body weight loss
Semaglutide tends to be more effective for both blood sugar and weight loss.
Side Effects
Both cause similar side effects:
- Nausea (most common)
- Diarrhea or constipation
- Decreased appetite
- Headache
- Fatigue
Side effects are worst when you start and after dose increases. Most people adjust within a few weeks.
Brand Names
Semaglutide:
- Ozempic (diabetes, weekly injection)
- Wegovy (weight loss, weekly injection)
- Rybelsus (diabetes, daily pill)
Liraglutide:
- Victoza (diabetes, daily injection)
- Saxenda (weight loss, daily injection)
Cost
Semaglutide medications: ~$900-1,350/month Liraglutide medications: ~$1,200-1,400/month
Semaglutide is generally cheaper at list price and more effective. But your insurance coverage will decide what you actually pay.
Who Should Choose Semaglutide?
- You want weekly dosing (or a daily pill option)
- You want stronger results
- You're starting fresh with GLP-1 treatment
- Your insurance covers it
Who Should Choose Liraglutide?
- You've used it before and it works
- Your insurance covers it and not semaglutide
- You prefer daily dosing for more control
- You can't tolerate semaglutide
Bottom Line
Semaglutide is newer, more effective, and more convenient. Liraglutide is older and still works well for many people.
The best choice depends on your insurance, your health history, and what your doctor recommends.
Work with your healthcare provider to determine which medication is right for you. Individual results and experiences vary.