Drug side effects
vancomycin Side Effects
The reactions most often reported to the FDA for vancomycin (also sold as Vancocin), with demographics, serious outcomes, and reporting trends.
Data updated 2026-05-15
- 55,549
- FAERS reports
Data from the FDA Adverse Event Reporting System (FAERS), 1999 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 vancomycin come from 55,549 reports to the FDA, broken down here by frequency, patient demographics, and serious outcomes.
This page analyzes 55,549 reports to the FDA Adverse Event Reporting System (FAERS) for vancomycin (Vancocin): 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
55,549
Reports Mentioning Death
11,029
19.9% of reports — not proof the medicine caused the death
Hospitalizations
30,109
54.2% 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 11,029 reports where death was an outcome. These are voluntarily reported and do not establish causation.
| Reaction | Reports |
|---|---|
| DEATH | 1,233 |
| SEPSIS | 1,034 |
| SEPTIC SHOCK | 990 |
| RENAL FAILURE | 956 |
| MULTIPLE ORGAN DYSFUNCTION SYNDROME | 866 |
| RESPIRATORY FAILURE | 833 |
| PNEUMONIA | 780 |
| PYREXIA | 721 |
| ACUTE KIDNEY INJURY | 675 |
| HYPOTENSION | 629 |
| MULTI-ORGAN FAILURE | 579 |
| CONDITION AGGRAVATED | 508 |
| CARDIAC ARREST | 507 |
| PAIN | 492 |
| DIARRHOEA | 456 |
| RENAL IMPAIRMENT | 422 |
| THROMBOCYTOPENIA | 420 |
| DYSPNOEA | 413 |
Reactions in Hospitalization Reports
Top reactions in 30,109 reports where hospitalization was an outcome.
| Reaction | Reports |
|---|---|
| ACUTE KIDNEY INJURY | 2,777 |
| PYREXIA | 2,442 |
| SEPSIS | 1,441 |
| PNEUMONIA | 1,436 |
| DIARRHOEA | 1,361 |
| DRUG REACTION WITH EOSINOPHILIA AND SYSTEMIC SYMPTOMS | 1,348 |
| HYPOTENSION | 1,295 |
| RENAL FAILURE | 1,239 |
| DYSPNOEA | 1,116 |
| SEPTIC SHOCK | 1,087 |
| CONDITION AGGRAVATED | 1,054 |
| NAUSEA | 1,049 |
| THROMBOCYTOPENIA | 1,027 |
| RESPIRATORY FAILURE | 974 |
| VOMITING | 933 |
| RASH | 922 |
| FEBRILE NEUTROPENIA | 920 |
| ANAEMIA | 875 |
Nearby, Related Medications
What the FAERS Data Reveals About vancomycin Side Effects
The FDA Adverse Event Reporting System (FAERS) contains 55,549 voluntary reports linked to vancomycin and its brand equivalents (Vancocin), spanning 1999 through 2025. Of those, 11,029 (19.9%) listed death as an outcome and 30,109 (54.2%) 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, 46% were female and 54% male; age distribution skews toward 45-64, with 15,132 reports in that bracket. The single most reported reaction is acute kidney injury with 4,178 submissions, followed by pyrexia and drug reaction with eosinophilia and systemic symptoms.
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 vancomycin's 55,549.
Read our methodology - how this data is sourced, computed, and verified.