Drug side effects
hydralazine Side Effects
The reactions most often reported to the FDA for hydralazine (also sold as Apresoline), with demographics, serious outcomes, and reporting trends.
Data updated 2026-05-15
- 28,498
- FAERS reports
Data from the FDA Adverse Event Reporting System (FAERS), 1995 to 2025. A FAERS report records a temporal association, not proof of cause. See our methodology for how figures are compiled and de-duplicated.
The most commonly reported side effects of hydralazine come from 28,498 reports to the FDA, broken down here by frequency, patient demographics, and serious outcomes.
This page analyzes 28,498 reports to the FDA Adverse Event Reporting System (FAERS) for hydralazine (Apresoline): the reactions reported most often, who reported them, serious outcomes such as hospitalization, and year-over-year trends. A FAERS report does not prove the drug caused the effect, and report volume tracks how widely a drug is used, not how likely an effect is for any one person. Educational information, not medical advice.
Total Reports
28,498
Reports Mentioning Death
3,510
12.3% of reports — not proof the medicine caused the death
Hospitalizations
12,190
42.8% 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 3,510 reports where death was an outcome. These are voluntarily reported and do not establish causation.
| Reaction | Reports |
|---|---|
| DEATH | 1,309 |
| CHRONIC KIDNEY DISEASE | 530 |
| ACUTE KIDNEY INJURY | 449 |
| RENAL FAILURE | 409 |
| END STAGE RENAL DISEASE | 403 |
| COMPLETED SUICIDE | 255 |
| CARDIAC ARREST | 182 |
| CARDIAC FAILURE CONGESTIVE | 160 |
| NEPHROGENIC ANAEMIA | 157 |
| PNEUMONIA | 144 |
| DYSPNOEA | 129 |
| SEPSIS | 126 |
| RESPIRATORY FAILURE | 121 |
| TOXICITY TO VARIOUS AGENTS | 115 |
| ANAEMIA | 102 |
| HYPERTENSION | 99 |
| RENAL INJURY | 98 |
| ATRIAL FIBRILLATION | 94 |
| CEREBROVASCULAR ACCIDENT | 93 |
| ASTHENIA | 92 |
Reactions in Hospitalization Reports
Top reactions in 12,190 reports where hospitalization was an outcome.
| Reaction | Reports |
|---|---|
| ACUTE KIDNEY INJURY | 1,201 |
| DYSPNOEA | 895 |
| RENAL FAILURE | 836 |
| HYPERTENSION | 767 |
| CHRONIC KIDNEY DISEASE | 753 |
| PNEUMONIA | 708 |
| CARDIAC FAILURE CONGESTIVE | 704 |
| ANTI-NEUTROPHIL CYTOPLASMIC ANTIBODY POSITIVE VASCULITIS | 671 |
| FATIGUE | 599 |
| NAUSEA | 595 |
| FALL | 553 |
| DIARRHOEA | 541 |
| ASTHENIA | 537 |
| END STAGE RENAL DISEASE | 480 |
| ANAEMIA | 476 |
| VOMITING | 446 |
| HYPOTENSION | 444 |
| DIZZINESS | 433 |
Nearby, Related Medications
What the FAERS Data Reveals About hydralazine Side Effects
The FDA Adverse Event Reporting System (FAERS) contains 28,498 voluntary reports linked to hydralazine and its brand equivalents (Apresoline), spanning 1995 through 2025. Of those, 3,510 (12.3%) listed death as an outcome and 12,190 (42.8%) 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, 54% were female and 45% male; age distribution skews toward 45-64, with 6,121 reports in that bracket. The single most reported reaction is chronic kidney disease with 2,819 submissions, followed by acute kidney injury and renal failure.
How to read these numbers
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.
Drugs With a Similar FAERS Report Volume
Other medications with a total FDA adverse-event report count closest to hydralazine's 28,498.
Read our methodology - how this data is sourced, computed, and verified.