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Metolazone Side Effects

The most commonly reported side effects of metolazone include dyspnoea, acute kidney injury, and death, based on 13,697 FDA adverse event reports from 2004 to 2025.

Metolazone side effects

Percentages show how often each reaction appears relative to total reports for metolazone.

1
Dyspnoea8.9%1,220
2
Acute Kidney Injury6.9%950
3
Death6.6%910
4
Renal Failure5.0%690
5
Nausea4.9%669
6
Chronic Kidney Disease4.9%665
7
Fatigue4.8%658
8
Diarrhoea4.7%645
9
Cardiac Failure Congestive4.4%607
10
Hypotension4.4%599
11
Headache4.2%570
12
Dizziness4.0%546
13
Fall3.8%520
14
Fluid Retention3.7%513
15
Asthenia3.7%500

These are voluntary reports and do not establish that metolazone caused these reactions.

Report severity

80.9%Serious11,078 reports
53.4%Hospitalizations7,312 reports
20.5%Fatal2,808 reports

Seriousness is determined by the reporter, not by OpenClaim.

Metolazone drug interactions

Other drugs that appear in adverse event reports alongside metolazone. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.

Also suspected

1
Treprostinil9.3%1,270
2
Furosemide6.7%921
3
Ambrisentan6.7%915
4
Omeprazole4.3%588
5
Esomeprazole3.9%532
6
Macitentan3.7%508
7
Lenalidomide3.7%503
8
Digoxin3.1%429
9
Pantoprazole-sodium3.0%414
10
Lansoprazole2.5%341
11
Spironolactone2.4%335
12
Bosentan2.4%330
13
Dabigatran-etexilate-mesylate2.4%327
14
Apixaban2.4%326
15
Aspirin2.4%324

Taken alongside

1
Furosemide52.4%7,176
2
Potassium-chloride30.3%4,150
3
Aspirin26.4%3,620
4
Spironolactone25.1%3,432
5
Acetaminophen23.3%3,196
6
Atorvastatin-calcium21.1%2,895
7
Insulin20.9%2,862
8
Metoprolol20.6%2,826
9
Albuterol19.3%2,644
10
Levothyroxine-sodium18.8%2,575
11
Warfarin17.6%2,404
12
Gabapentin17.1%2,346
13
Ergocalciferol16.7%2,294
14
Allopurinol16.4%2,253
15
Omeprazole15.3%2,099

Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.

Who reports metolazone side effects

49.4% of metolazone adverse event reports involve female patients and 45.3% involve male patients. The largest age group is elderly at 57%. These figures reflect who reports side effects, not underlying risk.

Sex

Female49.4%
Male45.3%
Unknown5.3%

Age group

< 20.3%
2–110.3%
12–170.3%
18–6442.6%
65+56.5%

What is metolazone used for

Conditions and purposes for which patients were taking metolazone when the adverse event was reported.

Abdominal DistensionAcute Kidney InjuryAcute Prerenal FailureAngina PectorisAnticoagulant TherapyAnxietyAortic StenosisAscitesAtrial FibrillationAbdominal DistensionAcute Kidney InjuryAcute Left Ventricular FailureAngina PectorisAnxietyAsthma

Showing 15 of 200 indications

Metolazone brand names and reporting trend

Metolazone is sold under the brand name Diulo.

Brand names

Diulo11,625

Quarterly reports (20042025)

20052010201520202025

An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.

Taking metolazone with another medication?

Ask OpenClaim about your specific drug combination. Get a sourced report using FDA data, drug labels, and medical literature.