MID-VOLUME · HOSP-HEAVY
cephalexin Side Effects
cephalexin (also sold as Keflex) sits MID-VOLUME #232 of 524 by FAERS report count. Lead signal: HOSP-HEAVY - 35.0% mention hospitalization (7,230 reports). Demographics and serious-outcome tables follow.
Data updated 2026-05-15
- 20,636
- FAERS reports
FDA Adverse Event Reporting System extract for cephalexin. Stamp set WATCHLIST · DEATH-HEAVY · HOSP-HEAVY. How figures are compiled.
cephalexin: 35.0% mention hospitalization (7,230 reports). Death stamp DEATH-HEAVY; volume band MID-VOLUME #232 of 524 by FAERS report count.
Mid-book FAERS page for cephalexin (Keflex) (20,636 reports). Signature HOSP-HEAVY. Dominant age band on file: 45-64. Educational reference only.
Counts from the openFDA FAERS extract (2003–2025). Stamps WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
CHRONIC KIDNEY DISEASE leads 2,155 of 20,636 reports
Who reports · age peak 45-64 (SEX-BALANCED)
Sex coding · SEX-BALANCED
Age peak 45-64 (4,575 reports)
FAERS filings rising toward 2025
Reactions in Death Reports
Death-mentioned subset is HEAVY here (1,749 reports, 8.5%). Top co-reported reactions in that subset - voluntary, not causal.
| Reaction | Reports |
|---|---|
| DEATH | 685 |
| RENAL FAILURE | 268 |
| CHRONIC KIDNEY DISEASE | 264 |
| ACUTE KIDNEY INJURY | 235 |
| DYSPNOEA | 165 |
| END STAGE RENAL DISEASE | 165 |
| ANXIETY | 141 |
| PAIN | 118 |
| PNEUMONIA | 116 |
| CARDIAC ARREST | 97 |
| PAIN IN EXTREMITY | 91 |
| SEPSIS | 88 |
| ARTERIOSCLEROSIS | 86 |
| HYPOXIA | 86 |
| NAUSEA | 86 |
| CARDIAC FAILURE CONGESTIVE | 84 |
| NEPHROGENIC ANAEMIA | 82 |
| HYPOTENSION | 81 |
| PULMONARY EMBOLISM | 81 |
| CONDITION AGGRAVATED | 80 |
Reactions in Hospitalization Reports
Hospitalization is HEAVY (7,230, 35.0% of the book). Top reactions in those rows:
| Reaction | Reports |
|---|---|
| PAIN | 695 |
| DYSPNOEA | 686 |
| ACUTE KIDNEY INJURY | 619 |
| ANXIETY | 573 |
| RENAL FAILURE | 573 |
| CHRONIC KIDNEY DISEASE | 547 |
| NAUSEA | 532 |
| DIARRHOEA | 508 |
| URINARY TRACT INFECTION | 462 |
| FALL | 445 |
| FATIGUE | 443 |
| PNEUMONIA | 442 |
| PAIN IN EXTREMITY | 432 |
| VOMITING | 399 |
| PYREXIA | 379 |
| HEADACHE | 372 |
| PULMONARY EMBOLISM | 355 |
| DIZZINESS | 350 |
| ASTHENIA | 335 |
| HYPERTENSION | 332 |
How to read cephalexin FAERS figures (WATCHLIST · DEATH-HEAVY · HOSP-HEAVY)
FAERS holds 20,636 voluntary reports linked to cephalexin (Keflex), 2003-2025. Death is listed on 1,749 (8.5%). Hospitalization appears on 7,230 (35.0%). Top co-reported indication: Product Used For Unknown Indication.
Mid-volume extract - treat DEATH-HEAVY · HOSP-HEAVY as signal-detection rates next to 35.0% mention hospitalization (7,230 reports).
Read with cephalexin
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 20,677 FAERS cases (Δ 41 heavier vs cephalexin); DEATH-HEAVY · HOSP-HEAVY · MALE-LED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 20,544 FAERS cases (Δ 92 lighter vs cephalexin); DEATH-MARKED · HOSP-MID · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 20,453 FAERS cases (Δ 183 lighter vs cephalexin); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(total_reports) peer at 20,452 FAERS cases (Δ 184 lighter vs cephalexin); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED.
ABS(death_share) pole at 62.1% death-mentioned reports (Δ 53.6 pp vs cephalexin's DEATH-HEAVY): CASELOAD · HOSP-MID.
cephalexin stamps DEATH-HEAVY · HOSP-HEAVY; FAERS outcome shares are signal-detection rates, not incidence. Read them next to caseload WATCHLIST and the label guide.