Drug interactions
Dulaglutide + Metformin-sitagliptin
Severity: Moderate
Dulaglutide and Metformin-sitagliptin: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Combining dulaglutide with metformin and sitagliptin gives additive glucose lowering, but the two incretin-based agents (GLP-1 agonist and DPP-4 inhibitor) offer little added benefit together. Hypoglycemia risk is low unless a sulfonylurea or insulin is also used.
What this interaction means in plain words
Dulaglutide and Metformin-sitagliptin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dulaglutide belongs to Endocrine; Metformin-sitagliptin belongs to Endocrine.
Why it happens
Overlapping incretin pathway effects: dulaglutide activates GLP-1 receptors while sitagliptin raises endogenous GLP-1.
What to do
Generally avoid combining a DPP-4 inhibitor with a GLP-1 agonist; stop sitagliptin if dulaglutide is started. Monitor glucose and GI tolerance.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Metformin-sitagliptin
Other interactions of Dulaglutide
Frequently asked questions
Can I take Dulaglutide with Metformin-sitagliptin?
MediHelp rates the interaction as moderate. Dulaglutide and Metformin-sitagliptin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Combining dulaglutide with metformin and sitagliptin gives additive glucose lowering, but the two incretin-based agents (GLP-1 agonist and DPP-4 inhibitor) offer little added benefit together. Hypoglycemia risk is low unless a sulfonylurea or insulin is also used.
How serious is the interaction between Dulaglutide and Metformin-sitagliptin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Generally avoid combining a DPP-4 inhibitor with a GLP-1 agonist; stop sitagliptin if dulaglutide is started. Monitor glucose and GI tolerance.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Clozapine, Contrast media, Diatrizoate meglumine / diatrizoate. The full list is on the Metformin-sitagliptin page.
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