MID-VOLUME · HOSP-HEAVY
cyanocobalamin Side Effects
cyanocobalamin (also sold as Vitamin B12) sits MID-VOLUME #186 of 524 by FAERS report count. Lead signal: HOSP-HEAVY - 40.4% mention hospitalization (12,543 reports). Demographics and serious-outcome tables follow.
Data updated 2026-05-15
- 31,083
- FAERS reports
FDA Adverse Event Reporting System extract for cyanocobalamin. Stamp set CASELOAD · DEATH-HEAVY · HOSP-HEAVY. How figures are compiled.
cyanocobalamin: 40.4% mention hospitalization (12,543 reports). Death stamp DEATH-HEAVY; volume band MID-VOLUME #186 of 524 by FAERS report count.
Mid-book FAERS page for cyanocobalamin (Vitamin B12) (31,083 reports). Signature HOSP-HEAVY. Dominant age band on file: 45-64. Educational reference only.
Counts from the openFDA FAERS extract (2004–2025). Stamps CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
FATIGUE leads 3,101 of 31,083 reports
Who reports · age peak 45-64 (SEX-BALANCED)
Sex coding · SEX-BALANCED
Age peak 45-64 (6,929 reports)
FAERS filings rising toward 2025
Reactions in Death Reports
Death-mentioned subset is HEAVY here (3,041 reports, 9.8%). Top co-reported reactions in that subset - voluntary, not causal.
| Reaction | Reports |
|---|---|
| DEATH | 1,103 |
| FATIGUE | 349 |
| ASTHENIA | 289 |
| VOMITING | 269 |
| CONDITION AGGRAVATED | 261 |
| GENERAL PHYSICAL HEALTH DETERIORATION | 259 |
| DIARRHOEA | 258 |
| CONFUSIONAL STATE | 256 |
| HYPERTENSION | 253 |
| HYPOAESTHESIA | 250 |
| RHEUMATOID ARTHRITIS | 250 |
| HELICOBACTER INFECTION | 241 |
| ARTHRALGIA | 240 |
| SYSTEMIC LUPUS ERYTHEMATOSUS | 240 |
| TYPE 2 DIABETES MELLITUS | 240 |
| PAIN | 237 |
| INFUSION RELATED REACTION | 235 |
| JOINT SWELLING | 235 |
Reactions in Hospitalization Reports
Hospitalization is HEAVY (12,543, 40.4% of the book). Top reactions in those rows:
| Reaction | Reports |
|---|---|
| FATIGUE | 1,311 |
| NAUSEA | 1,256 |
| DYSPNOEA | 1,139 |
| PNEUMONIA | 1,078 |
| VOMITING | 1,065 |
| HEADACHE | 1,064 |
| FALL | 1,026 |
| ASTHENIA | 1,015 |
| PAIN | 979 |
| DIARRHOEA | 973 |
| PYREXIA | 967 |
| HYPERTENSION | 903 |
| ARTHRALGIA | 781 |
| ABDOMINAL PAIN | 735 |
| MALAISE | 731 |
| CONDITION AGGRAVATED | 714 |
| GASTROOESOPHAGEAL REFLUX DISEASE | 705 |
| DIZZINESS | 700 |
How to read cyanocobalamin FAERS figures (CASELOAD · DEATH-HEAVY · HOSP-HEAVY)
FAERS holds 31,083 voluntary reports linked to cyanocobalamin (Vitamin B12), 2004-2025. Death is listed on 3,041 (9.8%). Hospitalization appears on 12,543 (40.4%). Top co-reported indication: Product Used For Unknown Indication.
Mid-volume extract - treat DEATH-HEAVY · HOSP-HEAVY as signal-detection rates next to 40.4% mention hospitalization (12,543 reports).
Read with cyanocobalamin
Peers ranked by ABS(total_reports), then an ABS(death_share) pole; guide hop follows DEATH-HEAVY · HOSP-HEAVY stamps.
ABS(total_reports) peer at 31,122 FAERS cases (Δ 39 heavier vs cyanocobalamin); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 31,164 FAERS cases (Δ 81 heavier vs cyanocobalamin); DEATH-MARKED · HOSP-LIGHT · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 30,895 FAERS cases (Δ 188 lighter vs cyanocobalamin); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 31,340 FAERS cases (Δ 257 heavier vs cyanocobalamin); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(death_share) pole at 62.1% death-mentioned reports (Δ 52.3 pp vs cyanocobalamin's DEATH-HEAVY): CASELOAD · HOSP-MID.
cyanocobalamin stamps DEATH-HEAVY · HOSP-HEAVY; FAERS outcome shares are signal-detection rates, not incidence. Read them next to caseload CASELOAD and the label guide.