Drug interactions
Insulin degludec + Metformin
Severity: Minor
Insulin degludec and Metformin: minor 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 lowers blood glucose through mechanisms that do not depend on insulin secretion, so adding it to basal insulin gives an additive glucose-lowering effect. This is a standard combination, but hypoglycemia can occur, particularly when treatment is started or the insulin dose is not reduced.
What this interaction means in plain words
Insulin degludec and Metformin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Insulin degludec belongs to Endocrine; Metformin belongs to Endocrine.
Why it happens
Additive pharmacodynamic glucose-lowering effect from reduced hepatic glucose output and improved insulin sensitivity combined with exogenous insulin.
What to do
Monitor blood glucose when starting or stopping metformin and reduce the insulin degludec dose if hypoglycemia occurs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Insulin degludec
Other interactions of Metformin
Frequently asked questions
Can I take Insulin degludec with Metformin?
MediHelp rates the interaction as minor. Insulin degludec and Metformin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Metformin lowers blood glucose through mechanisms that do not depend on insulin secretion, so adding it to basal insulin gives an additive glucose-lowering effect. This is a standard combination, but hypoglycemia can occur, particularly when treatment is started or the insulin dose is not reduced.
How serious is the interaction between Insulin degludec and Metformin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose when starting or stopping metformin and reduce the insulin degludec dose if hypoglycemia occurs.
What other medicines interact with Insulin degludec?
MediHelp also lists interactions of Insulin degludec with, for example, Alogliptin-pioglitazone, Ethanol, Glimepiride-pioglitazone. The full list is on the Insulin degludec page.
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