Medications
What is semaglutide?
A plain-English explainer of semaglutide — what it is, how it works, the brand names it appears under, and what it is approved to treat.
6 min read · Updated 2026-05-24
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What semaglutide actually is
Semaglutide is a GLP-1 receptor agonist — a synthetic molecule that mimics a gut hormone called glucagon-like peptide-1.
It was developed by Novo Nordisk and first approved by the FDA in 2017.
How it works
GLP-1 is released after eating. It tells the pancreas to release insulin, slows how fast the stomach empties, and signals the brain that you are full.
Semaglutide binds the same receptor as natural GLP-1 but stays active far longer, which is why it is dosed weekly instead of after every meal.
Brand names
Ozempic — once-weekly injection approved for type 2 diabetes.
Wegovy — once-weekly injection approved for chronic weight management.
Rybelsus — daily oral tablet approved for type 2 diabetes.
All three are the same active molecule at different doses and formulations.
What it is approved for
Type 2 diabetes (Ozempic, Rybelsus).
Chronic weight management in adults with obesity, or overweight with a weight-related condition (Wegovy).
Reducing cardiovascular events in adults with established cardiovascular disease and either type 2 diabetes or obesity.
What it is not
It is not a stimulant, not a thyroid drug, and not a fat-burner.
It does not work by speeding up metabolism. Most of the effect comes from appetite regulation and slower gastric emptying.
Key takeaways
- Semaglutide is a long-acting GLP-1 receptor agonist.
- Ozempic, Wegovy and Rybelsus are all semaglutide at different doses and formulations.
- The mechanism is appetite and gut signaling, not metabolism.
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