Reported signals
acyclovir
Registration status unknownDrugalgemeen
112,882
reports (FAERS)
72.5%
reported as serious
11,118
fatal reports (9.8%)
19
signals above threshold
2026-07
last updated
Signal ranking · ROR
What stands out in the reports.
On the labelNew signalUnknown & frequent
Symptom
0.1110100
ROR [95% CI]
Plasma cell myeloma
13.3 [12.8–13.8]
Febrile neutropenia
8.3 [8.0–8.7]
White blood cell count decreased
5.7 [5.5–5.9]
Platelet count decreased
5.6 [5.4–5.8]
Neuropathy peripheral
5.4 [5.2–5.6]
Pancytopenia
5.0 [4.8–5.3]
Neutropenia
4.6 [4.4–4.7]
Thrombocytopenia
4.1 [4.0–4.3]
Sepsis
3.8 [3.6–3.9]
Pneumonia
3.4 [3.3–3.5]
Acute kidney injury
3.1 [3.0–3.3]
Haemoglobin decreased
3.0 [2.9–3.2]
Pyrexia
2.7 [2.6–2.8]
Constipation
2.6 [2.5–2.7]
Anaemia
2.5 [2.4–2.6]
ROR = reporting odds ratio (log scale). A value above 1 means the symptom is reported more often for this product than for all other products combined. This measures how much it stands out in reports — not cause, not risk.
Interpretation
Summary not yet available — will be auto-generated.
Label versus report
On the label
No signals currently mapped to the label.
Newly reported
Plasma cell myeloma
Febrile neutropenia
White blood cell count decreased
Platelet count decreased
Neuropathy peripheral
Pancytopenia
Neutropenia
Thrombocytopenia
Recall history · 0 on record
No recalls on record.
Compare within ALGEMEEN
Source & citation
HealthProves. acyclovir — reported signals. Retrieved 2026-07-05. Source: openFDA (FAERS). healthproves.com/acyclovir/
FAERS112,882 records
Retrieved2026-07-05
MethodROR / disproportionality