Dulaglutide vs Semaglutide: side-by-side comparison
Dulaglutide and Semaglutide belong to the same class (GLP-1 receptor agonist). They share therapeutic approach but differ in mechanism nuances, half-life, side-effect profile and available formulations. This comparison summarises what is common and where they diverge.
| Property | Dulaglutide | Semaglutide |
|---|---|---|
| Therapeutic class | GLP-1 receptor agonist | GLP-1 receptor agonist |
| CAS | 923950-08-7 | 910463-68-2 |
| ATC | A10BJ05 | A10BJ06 |
| Molecular weight | ~63 kDa | 4113.6 g/mol |
| Brands with this active ingredient | 1 | 2 |
What they share
Both are in the GLP-1 receptor agonist class, giving them a common pharmacological architecture and many shared safety and management points. Choice within the class comes down to mechanism nuances, half-life, side-effect profile and individual response.
Key differences
Differences within the GLP-1 receptor agonist class are what matter in practice: half-life, route of administration, equivalent doses, specific interactions, predominant side-effect profile and accumulated clinical experience. This page frames them; the prescribing information gives quantitative detail.
Mechanisms compared
Dulaglutide: Dulaglutide activates the GLP-1 receptor in pancreatic beta cells, stimulating glucose-dependent insulin secretion and suppressing inappropriate glucagon release from alpha cells. Semaglutide: Semaglutide binds and activates the GLP-1 receptor, a G-protein coupled receptor expressed in pancreatic beta and alpha cells, the central nervous system and the gastrointestinal tract.
Indications compared
Dulaglutide: The medication is approved in adults with type 2 diabetes mellitus, as monotherapy when metformin is inappropriate or as add-on therapy to other antidiabetics, to improve glycaemic control. Semaglutide: Semaglutide is approved in adults with type 2 diabetes, as monotherapy or in combination with other antidiabetic agents, to improve glycaemic control.
Safety profile
Dulaglutide: The most common adverse effects are gastrointestinal: nausea, diarrhoea, vomiting and abdominal pain, usually mild to moderate and decreasing over the first weeks of treatment. Semaglutide: The most common adverse effects are gastrointestinal: nausea, vomiting, diarrhoea, constipation and abdominal discomfort, usually mild to moderate and tending to attenuate over weeks.
Frequently asked questions
Is Dulaglutide better than Semaglutide? ▾
Neither is universally better. Dulaglutide and Semaglutide share the GLP-1 receptor agonist class but differ in half-life, mechanism nuances and side-effect profile. The choice depends on the patient and the prescriber.
Can Dulaglutide and Semaglutide be combined? ▾
Combining two ingredients from the same GLP-1 receptor agonist class is uncommon and, in most cases, adds no benefit over one at an appropriate dose. The decision is always the prescriber's.
Do they have the same side-effect profile? ▾
Partly yes — they share many GLP-1 receptor agonist class effects, with nuances by mechanism and dose. The prescribing information lists differences.
Products with Dulaglutide
Products with Semaglutide
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.