LOW-VOLUME · HOSP-HEAVY
famciclovir Side Effects
famciclovir (also sold as Famvir) is a LOW-VOLUME FAERS extract #438 of 524 by FAERS report count. Still opens on HOSP-HEAVY: 31.2% mention hospitalization (836 reports).
Data updated 2026-05-15
- 2,678
- FAERS reports
Thinner FAERS book - still a temporal association ledger, not proof of cause. Methodology.
famciclovir: 31.2% mention hospitalization (836 reports). Death stamp DEATH-HEAVY; volume band LOW-VOLUME #438 of 524 by FAERS report count.
Thinner FAERS extract for famciclovir (Famvir) (2,678 reports #438 of 524 by FAERS report count). 31.2% mention hospitalization (836 reports). Sparse books still carry named reaction rows when present; not medical advice.
Counts from the openFDA FAERS extract (2004–2025). Stamps SIGNAL · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
FATIGUE leads 185 of 2,678 reports
Who reports · age peak 45-64 (SEX-BALANCED)
Sex coding · SEX-BALANCED
Age peak 45-64 (647 reports)
FAERS filings rising toward 2025
Reactions in Death Reports
Death-mentioned subset is HEAVY here (265 reports, 9.9%). Top co-reported reactions in that subset - voluntary, not causal.
| Reaction | Reports |
|---|---|
| DEATH | 86 |
| SEPSIS | 21 |
| PNEUMONIA | 19 |
| NEUTROPENIA | 15 |
| DIARRHOEA | 12 |
| PLASMA CELL MYELOMA | 12 |
| PYREXIA | 12 |
| THROMBOCYTOPENIA | 12 |
| CARDIAC ARREST | 11 |
| ANAEMIA | 10 |
| PANCYTOPENIA | 10 |
| ABDOMINAL PAIN | 9 |
| HYPOTENSION | 9 |
| NAUSEA | 9 |
| POST TRANSPLANT LYMPHOPROLIFERATIVE DISORDER | 9 |
| ALOPECIA | 8 |
| COMPLETED SUICIDE | 8 |
Reactions in Hospitalization Reports
Hospitalization is HEAVY (836, 31.2% of the book). Top reactions in those rows:
| Reaction | Reports |
|---|---|
| PNEUMONIA | 58 |
| DIARRHOEA | 55 |
| FATIGUE | 48 |
| PYREXIA | 47 |
| NAUSEA | 46 |
| FEBRILE NEUTROPENIA | 41 |
| DYSPNOEA | 40 |
| VOMITING | 36 |
| PAIN | 35 |
| FALL | 34 |
| URINARY TRACT INFECTION | 34 |
| ACUTE KIDNEY INJURY | 33 |
| DIZZINESS | 33 |
| HYPOTENSION | 33 |
| ASTHENIA | 31 |
| RASH | 31 |
| HEADACHE | 29 |
| SEPSIS | 28 |
| BACK PAIN | 26 |
How to read famciclovir FAERS figures (SIGNAL · DEATH-HEAVY · HOSP-HEAVY)
FAERS holds 2,678 voluntary reports linked to famciclovir (Famvir), 2004-2025. Death is listed on 265 (9.9%). Hospitalization appears on 836 (31.2%). Top co-reported indication: Product Used For Unknown Indication.
Sparse extract - named reactions and SEX-BALANCED skew still differ by drug; not a complete safety profile.
Read with famciclovir
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 2,699 FAERS cases (Δ 21 heavier vs famciclovir); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's SIGNAL · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 2,824 FAERS cases (Δ 146 heavier vs famciclovir); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's SIGNAL · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 2,845 FAERS cases (Δ 167 heavier vs famciclovir); DEATH-HEAVY · HOSP-LIGHT · SEX-BALANCED vs this page's SIGNAL · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 2,870 FAERS cases (Δ 192 heavier vs famciclovir); DEATH-MARKED · HOSP-MID · FEMALE-LED vs this page's SIGNAL · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(death_share) pole at 62.1% death-mentioned reports (Δ 52.2 pp vs famciclovir's DEATH-HEAVY): CASELOAD · HOSP-MID.
famciclovir stamps DEATH-HEAVY · HOSP-HEAVY; FAERS outcome shares are signal-detection rates, not incidence. Read them next to caseload SIGNAL and the label guide.