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 2026-05-27
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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.
What semaglutide actually is
is a — 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 to release , slows how fast the stomach empties, and signals the brain that you are full.
Semaglutide binds the same 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 .
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 , or overweight with a weight-related condition (Wegovy).
Reducing in adults with established cardiovascular disease and either type 2 diabetes or obesity.
For how prescribers typically structure the dose increase, see how semaglutide dosing is typically structured.
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 . Most of the effect comes from appetite regulation and slower .
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