Drug interactions
Insulin degludec / insulin aspart + Metformin
Severity: Moderate
Insulin degludec / insulin aspart and Metformin: 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
Metformin and insulin have additive glucose-lowering effects, which is often used intentionally. The combination can increase the risk of hypoglycemia, especially when initiated or when doses are increased.
What this interaction means in plain words
Insulin degludec / insulin aspart and Metformin 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.
Why it happens
Additive pharmacodynamic effect: metformin reduces hepatic glucose output and improves insulin sensitivity while insulin increases glucose uptake.
What to do
Monitor blood glucose closely when starting or adjusting either drug and reduce the insulin dose if hypoglycemia occurs. Educate the patient on recognizing hypoglycemia.
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
Frequently asked questions
Can I take Insulin degludec / insulin aspart with Metformin?
MediHelp rates the interaction as moderate. Insulin degludec / insulin aspart and Metformin 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. Metformin and insulin have additive glucose-lowering effects, which is often used intentionally. The combination can increase the risk of hypoglycemia, especially when initiated or when doses are increased.
How serious is the interaction between Insulin degludec / insulin aspart and Metformin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose closely when starting or adjusting either drug and reduce the insulin dose if hypoglycemia occurs. Educate the patient on recognizing hypoglycemia.
What other medicines interact with Metformin?
MediHelp also lists interactions of Metformin with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin page.
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