HIGH-VOLUME · HOSP-HEAVY
valacyclovir Side Effects
valacyclovir (also sold as Valtrex) is HIGH-VOLUME in this FAERS book #162 of 524 by FAERS report count. Signature opener: HOSP-HEAVY - 40.0% mention hospitalization (15,607 reports).
Data updated 2026-05-15
- 39,048
- FAERS reports
FAERS voluntary reports, 2004 to 2025. High volume tracks exposure and reporting culture; see methodology for de-dup rules.
valacyclovir: 40.0% mention hospitalization (15,607 reports). Death stamp DEATH-HEAVY; volume band HIGH-VOLUME #162 of 524 by FAERS report count.
High-report extract for valacyclovir (Valtrex): 39,048 FAERS rows (2004-2025). Top named reactions: FATIGUE, DIARRHOEA, NAUSEA. Outcome stamps DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED. FAERS is voluntary signal detection, not incidence.
Counts from the openFDA FAERS extract (2004–2025). Stamps CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
FATIGUE leads 2,294 of 39,048 reports
Who reports · age peak 45-64 (SEX-BALANCED)
Sex coding · SEX-BALANCED
Age peak 45-64 (9,470 reports)
FAERS filings rising toward 2025
Reactions in Death Reports
Death-mentioned subset is HEAVY here (3,520 reports, 9.0%). Top co-reported reactions in that subset - voluntary, not causal.
| Reaction | Reports |
|---|---|
| DEATH | 1,041 |
| PNEUMONIA | 217 |
| THROMBOCYTOPENIA | 214 |
| NEUTROPENIA | 205 |
| PYREXIA | 199 |
| SEPTIC SHOCK | 195 |
| DISEASE PROGRESSION | 187 |
| SEPSIS | 183 |
| DIARRHOEA | 155 |
| FEBRILE NEUTROPENIA | 147 |
| ANAEMIA | 143 |
| PLASMA CELL MYELOMA | 131 |
| RESPIRATORY FAILURE | 124 |
| ACUTE KIDNEY INJURY | 121 |
| INFECTION | 115 |
| NAUSEA | 115 |
| MULTIPLE ORGAN DYSFUNCTION SYNDROME | 114 |
| HYPOTENSION | 107 |
| CYTOKINE RELEASE SYNDROME | 105 |
Reactions in Hospitalization Reports
Hospitalization is HEAVY (15,607, 40.0% of the book). Top reactions in those rows:
| Reaction | Reports |
|---|---|
| FEBRILE NEUTROPENIA | 1,189 |
| PNEUMONIA | 1,115 |
| PYREXIA | 1,012 |
| ACUTE KIDNEY INJURY | 843 |
| DIARRHOEA | 799 |
| FATIGUE | 630 |
| CYTOKINE RELEASE SYNDROME | 627 |
| NAUSEA | 607 |
| NEUTROPENIA | 507 |
| THROMBOCYTOPENIA | 498 |
| DYSPNOEA | 493 |
| COVID-19 | 492 |
| ASTHENIA | 473 |
| VOMITING | 445 |
| ANAEMIA | 435 |
| FALL | 431 |
| SEPSIS | 400 |
| HEADACHE | 383 |
| PAIN | 371 |
How to read valacyclovir FAERS figures (CASELOAD · DEATH-HEAVY · HOSP-HEAVY)
FAERS holds 39,048 voluntary reports linked to valacyclovir (Valtrex), 2004-2025. Death is listed on 3,520 (9.0%). Hospitalization appears on 15,607 (40.0%). Top co-reported indication: Product Used For Unknown Indication.
CASELOAD books overweight common drugs and loud reporting cultures; HOSP-HEAVY is the page opener, not a per-patient risk.
Read with valacyclovir
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 38,664 FAERS cases (Δ 384 lighter vs valacyclovir); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 39,831 FAERS cases (Δ 783 heavier vs valacyclovir); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 38,197 FAERS cases (Δ 851 lighter vs valacyclovir); DEATH-HEAVY · HOSP-MID · FEMALE-LED vs this page's CASELOAD · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 37,936 FAERS cases (Δ 1,112 lighter vs valacyclovir); 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 53.1 pp vs valacyclovir's DEATH-HEAVY): CASELOAD · HOSP-MID.
valacyclovir stamps DEATH-HEAVY · HOSP-HEAVY; FAERS outcome shares are signal-detection rates, not incidence. Read them next to caseload CASELOAD and the label guide.