Drug interactions
Insulin lispro protamine / insulin lispro + Metformin-pioglitazone
Severity: Moderate
Insulin lispro protamine / insulin lispro and Metformin-pioglitazone: 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
Premixed lispro insulin used with metformin and pioglitazone has an additive glucose-lowering effect and increases hypoglycemia risk. Pioglitazone plus insulin also raises the risk of fluid retention and heart failure.
What this interaction means in plain words
Insulin lispro protamine / insulin lispro and Metformin-pioglitazone 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 glucose-lowering pharmacodynamic effects, with insulin and thiazolidinedione both contributing to fluid retention.
What to do
Monitor blood glucose and adjust the insulin dose when starting or stopping the oral agents. Assess for edema and heart failure symptoms.
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-pioglitazone
Frequently asked questions
Can I take Insulin lispro protamine / insulin lispro with Metformin-pioglitazone?
MediHelp rates the interaction as moderate. Insulin lispro protamine / insulin lispro and Metformin-pioglitazone 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. Premixed lispro insulin used with metformin and pioglitazone has an additive glucose-lowering effect and increases hypoglycemia risk. Pioglitazone plus insulin also raises the risk of fluid retention and heart failure.
How serious is the interaction between Insulin lispro protamine / insulin lispro and Metformin-pioglitazone?
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 and adjust the insulin dose when starting or stopping the oral agents. Assess for edema and heart failure symptoms.
What other medicines interact with Metformin-pioglitazone?
MediHelp also lists interactions of Metformin-pioglitazone with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin-pioglitazone page.
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