Benazepril and Metolazone interaction

Benazepril and Metolazone: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.

Major

Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.

What the FDA labels say

From the Metolazone label · effective 2026-01-15

Major

Other Antihypertensive Drugs When metolazone tablets, USP, are used with other antihypertensive drugs, particular care must be taken to avoid excessive reduction of blood pressure, especially during initial therapy.

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Moderate

Dosage adjustments of other antihypertensives may be necessary.

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Minor

Other Antihypertensives When metolazone tablets, USP, are used with other antihypertensive drugs, care must be taken, especially during initial therapy.

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From the Benazepril (Lotensin) label · effective 2025-09-30

Moderate

Patients at risk of excessive hypotension include those with the following conditions or characteristics: heart failure with systolic blood pressure below 100 mm Hg, ischemic heart disease, cerebrovascular disease, hyponatremia, high dose diuretic therapy, renal dialysis, or severe volume and/or salt depletion of any etiology.

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Moderate

In such patients, follow closely for the first 2 weeks of treatment and whenever the dose of benazepril or diuretic is increased.

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Moderate

Risk factors for the development of hyperkalemia include renal insufficiency, diabetes mellitus, and the concomitant use of potassium-sparing diuretics, potassium supplements and/or potassium-containing salt substitutes [see Drug Interactions (7.1) ] .

Warnings and precautionsby drug classView label on DailyMed
Moderate

Diuretics Hypotension Patients on diuretics, especially those in whom diuretic therapy was recently instituted, may occasionally experience an excessive reduction of blood pressure after initiation of therapy with Lotensin.

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Moderate

The possibility of hypotensive effects with Lotensin can be minimized by either discontinuing or decreasing the dose of diuretic prior to initiation of treatment with Lotensin [see Dosage and Administration (2.1) ].

Drug interactionsby drug classView label on DailyMed

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Not medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.