terazosin Side Effects
Also known as: Hytrin
Analysis of 7,436 adverse event reports submitted to the FDA from 2002 to 2025.
Total Reports
7,436
Death-Related
836
11.2% of reports
Hospitalizations
2,657
35.7% 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 836 reports where death was an outcome. These are voluntarily reported and do not establish causation.
| Reaction | Reports |
|---|---|
| DEATH | 325 |
| ACUTE KIDNEY INJURY | 61 |
| PNEUMONIA | 61 |
| RENAL FAILURE | 57 |
| CHRONIC KIDNEY DISEASE | 55 |
| FALL | 46 |
| CARDIAC ARREST | 45 |
| DYSPNOEA | 45 |
| ASTHENIA | 38 |
| END STAGE RENAL DISEASE | 38 |
| COMPLETED SUICIDE | 34 |
| HYPOTENSION | 34 |
| MYOCARDIAL INFARCTION | 31 |
| DIARRHOEA | 29 |
| GASTROINTESTINAL HAEMORRHAGE | 29 |
| SEPSIS | 29 |
| CARDIAC FAILURE CONGESTIVE | 28 |
| FATIGUE | 28 |
| PLEURAL EFFUSION | 28 |
| CEREBROVASCULAR ACCIDENT | 27 |
Reactions in Hospitalization Reports
Top reactions in 2,657 reports where hospitalization was an outcome.
| Reaction | Reports |
|---|---|
| FALL | 198 |
| PNEUMONIA | 192 |
| DYSPNOEA | 187 |
| ACUTE KIDNEY INJURY | 179 |
| ASTHENIA | 174 |
| HYPOTENSION | 157 |
| GASTROINTESTINAL HAEMORRHAGE | 149 |
| DIZZINESS | 148 |
| FATIGUE | 148 |
| RENAL FAILURE | 140 |
| DIARRHOEA | 127 |
| NAUSEA | 114 |
| DRUG INEFFECTIVE | 106 |
| ANAEMIA | 102 |
| HYPERTENSION | 99 |
| PAIN | 93 |
| PYREXIA | 93 |
| CEREBROVASCULAR ACCIDENT | 91 |
| SYNCOPE | 91 |
| ATRIAL FIBRILLATION | 90 |
Nearby — Related Medications
What the FAERS Data Reveals About terazosin Side Effects
The FDA Adverse Event Reporting System (FAERS) contains 7,436 voluntary reports linked to terazosin and its brand equivalents (Hytrin), spanning 2002 through 2025. Of those, 836 (11.2%) listed death as an outcome and 2,657 (35.7%) 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, 15% were female and 85% male; age distribution skews toward 75+, with 2,102 reports in that bracket. The single most reported reaction is drug ineffective with 474 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.