Enalapril and Metolazone interaction

Enalapril 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.

Warningsby drug classView label on DailyMed
Moderate

Dosage adjustments of other antihypertensives may be necessary.

Drug interactionsby drug classView label on DailyMed
Minor

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

Drug interactionsby drug classView label on DailyMed

From the Enalapril (Enalapril maleate) label · effective 2025-12-16

Moderate

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

Warnings and precautionsby drug classView label on DailyMed
Moderate

In these patients, enalapril maleate should be started under very close medical supervision and such patients should be followed closely for the first two weeks of treatment and whenever the dose of enalapril maleate and/or diuretic is increased.

Warnings and precautionsby drug classView label on DailyMed
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 ( 7.3 )].

Warnings and precautionsby drug classView label on DailyMed
Moderate

In patients who are elderly, volume-depleted (as on diuretic therapy), or with compromised renal function, use with NSAIDs, including selective COX-2 inhibitors, may result in deterioration of renal function, including renal failure.

Drug interactionsby drug classView label on DailyMed
Moderate

Non-Steroidal Anti-Inflammatory Agents (NSAIDs) Including Selective Cyclooxygenase-2 Inhibitors (COX-2 Inhibitors) In patients who are elderly, volume-depleted (including those on diuretic therapy), or with compromised renal function, co-administration of NSAIDs, including selective COX-2 inhibitors, with ACE inhibitors, including enalapril, may result in deterioration…

Drug interactionsby drug classView label on DailyMed

Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.

Open in the checker

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.