Drug interactions
Insulin lispro + Metformin
Severity: Minor
Insulin lispro 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 and insulin are commonly combined and have complementary glucose-lowering effects, which can cause hypoglycemia if the insulin dose is not adjusted. Metformin alone rarely causes hypoglycemia, so the risk comes mainly from the insulin.
What this interaction means in plain words
Insulin lispro 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 lispro belongs to Endocrine; Metformin belongs to Endocrine.
Why it happens
Additive glucose lowering from reduced hepatic glucose output and improved insulin sensitivity with metformin plus exogenous insulin.
What to do
Monitor glucose when starting or stopping metformin and adjust the insulin dose accordingly.
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 lispro
Other interactions of Metformin
Frequently asked questions
Can I take Insulin lispro with Metformin?
MediHelp rates the interaction as minor. Insulin lispro 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 and insulin are commonly combined and have complementary glucose-lowering effects, which can cause hypoglycemia if the insulin dose is not adjusted. Metformin alone rarely causes hypoglycemia, so the risk comes mainly from the insulin.
How serious is the interaction between Insulin lispro 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 glucose when starting or stopping metformin and adjust the insulin dose accordingly.
What other medicines interact with Insulin lispro?
MediHelp also lists interactions of Insulin lispro with, for example, Alogliptin-pioglitazone, Ethanol, Metreleptin. The full list is on the Insulin lispro page.
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