Metformin and lisinopril are commonly prescribed together for patients with type 2 diabetes and hypertension, and this combination is considered safe. ACE inhibitors like lisinopril may even provide additional kidney-protective benefits for diabetic patients.
How This Interaction Works (Mechanism)
Metformin works by reducing hepatic glucose production and improving insulin sensitivity, while lisinopril lowers blood pressure by inhibiting the angiotensin-converting enzyme. These mechanisms do not overlap or interfere with each other. Lisinopril may actually complement metformin therapy by reducing the progression of diabetic nephropathy through its effects on glomerular filtration pressure and proteinuria reduction.
Source: American Diabetes Association and American Heart Association Joint Guidelines, 2025
This combination is safe and commonly used in clinical practice. No dose adjustments are needed for either medication. Continue monitoring blood glucose, A1C, blood pressure, and kidney function as directed by your doctor. Report any persistent cough (a common lisinopril side effect) or GI symptoms (a common metformin side effect). Stay hydrated and follow your diabetes management plan.
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Sources and standards behind this page
What a drug interaction does, and how strongly it is supported, is documented in public labeling and federal safety references rather than in any one summary, and the sources below are the primary ones. They are linked so a reader can check a claim without taking this page's word for it.
- DailyMed carries the current FDA labeling for every marketed drug product, including the warnings and drug interaction sections.
- Drugs@FDA is the federal database of approved drug products and their approval documents.
- FDA: Drug interactions, what you should know explains how drug-drug, drug-food and drug-condition interactions are described on labels.
- FDA Drug Safety Communications publishes the agency's safety alerts and label changes as they are issued.
- FDA MedWatch is the program for reporting and reviewing adverse events, including suspected interactions.
- openFDA provides public access to FDA labeling and adverse event data.
- MedlinePlus drug information is the National Library of Medicine's consumer reference for what a medicine is and how it is taken.
- NIAAA: Harmful interactions documents which medicines interact with alcohol and how.
- NCCIH: Herb-drug interactions summarises the evidence on interactions between herbal products and medicines.
- National Library of Medicine maintains the drug and health databases the sources above draw on.
This page describes how this interaction works and where it is documented. It is not medical advice: a prescriber or pharmacist decides what applies to a particular patient and medication.
Frequently Asked Questions
Metformin and Lisinopril do not have a clinically significant interaction and are generally safe to take together. However, you should always inform your doctor about all medications and supplements you are taking to ensure they are appropriate for your specific health situation.
Metformin and lisinopril are commonly prescribed together for patients with type 2 diabetes and hypertension, and this combination is considered safe. ACE inhibitors like lisinopril may even provide additional kidney-protective benefits for diabetic patients.
Yes. Anytime you are taking multiple medications, supplements, or substances, you should inform your doctor and pharmacist. They can evaluate your specific risk factors (age, kidney function, other medications, medical conditions) and determine whether the Metformin and Lisinopril combination is safe for you, or whether adjustments are needed.
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