furosemide Side Effects
Also known as: Lasix
Analysis of 387,984 adverse event reports submitted to the FDA from 1997 to 2025.
Total Reports
387,984
Death-Related
60,624
15.6% of reports
Hospitalizations
190,901
49.2% of reports
Top Indication
Product Used For Unknown Indication
Most Reported Adverse Reactions
Who Reports Side Effects
Gender Distribution
Age Distribution
Reporting Trend by Year
Reactions in Death Reports
Top reactions reported in 60,624 reports where death was an outcome. These are voluntarily reported and do not establish causation.
| Reaction | Reports |
|---|---|
| DEATH | 18,272 |
| PNEUMONIA | 4,327 |
| DYSPNOEA | 4,288 |
| RENAL FAILURE | 3,777 |
| CARDIAC FAILURE | 3,095 |
| ACUTE KIDNEY INJURY | 3,073 |
| CARDIAC FAILURE CONGESTIVE | 2,910 |
| RESPIRATORY FAILURE | 2,904 |
| SEPSIS | 2,777 |
| CARDIAC ARREST | 2,742 |
| HYPOTENSION | 2,559 |
| DIARRHOEA | 2,390 |
| ANAEMIA | 2,303 |
| ASTHENIA | 2,290 |
| OFF LABEL USE | 2,230 |
| NAUSEA | 2,165 |
| FALL | 2,135 |
| FATIGUE | 2,127 |
| PYREXIA | 2,070 |
| PAIN | 2,028 |
Reactions in Hospitalization Reports
Top reactions in 190,901 reports where hospitalization was an outcome.
| Reaction | Reports |
|---|---|
| DYSPNOEA | 17,955 |
| PNEUMONIA | 13,043 |
| ACUTE KIDNEY INJURY | 12,281 |
| FALL | 11,740 |
| HYPOTENSION | 10,161 |
| DIARRHOEA | 10,073 |
| CARDIAC FAILURE CONGESTIVE | 9,776 |
| ASTHENIA | 9,370 |
| NAUSEA | 9,348 |
| ANAEMIA | 9,264 |
| FATIGUE | 8,652 |
| VOMITING | 7,757 |
| DIZZINESS | 7,089 |
| CARDIAC FAILURE | 7,077 |
| RENAL FAILURE | 7,061 |
| PYREXIA | 6,891 |
| OEDEMA PERIPHERAL | 6,726 |
| DEHYDRATION | 6,617 |
| PAIN | 6,551 |
| DRUG INTERACTION | 6,517 |
Nearby — Related Medications
What the FAERS Data Reveals About furosemide Side Effects
The FDA Adverse Event Reporting System (FAERS) contains 387,984 voluntary reports linked to furosemide and its brand equivalents (Lasix), spanning 1997 through 2025. Of those, 60,624 (15.6%) listed death as an outcome and 190,901 (49.2%) involved hospitalization. The most common indication reported alongside adverse events was Product Used For Unknown Indication.
Demographic breakdowns help contextualize who is being exposed to the drug. Of reports with known sex, 55% were female and 44% male; age distribution skews toward 75+, with 108,196 reports in that bracket. The single most reported reaction is dyspnoea with 29,104 submissions, followed by fatigue and diarrhoea.
FAERS is a signal-detection tool, not a scorecard. Reports are voluntary, and a single case may list multiple suspect drugs, so numbers above should not be read as incidence rates or per-patient risk. Widely prescribed drugs naturally accumulate more reports than niche therapies even when individual risk is low. These aggregates are useful for spotting patterns that merit further pharmacovigilance, not for choosing between medications. This page is for educational reference only and is not medical advice — speak with a licensed clinician about any side-effect concerns.
Read our methodology — how this data is sourced, computed, and verified.