LOW-VOLUME · FEMALE-LED
methimazole Side Effects
methimazole (also sold as Tapazole) is a LOW-VOLUME FAERS extract #352 of 524 by FAERS report count. Still opens on FEMALE-LED: 72% of sex-coded reports are female (4,801 F / 1,869 M).
Data updated 2026-05-15
- 7,411
- FAERS reports
Thinner FAERS book - still a temporal association ledger, not proof of cause. Methodology.
methimazole reporting skew - 72% of sex-coded reports are female (4,801 F / 1,869 M). Volume band LOW-VOLUME #352 of 524 by FAERS report count; caseload WATCHLIST.
Thinner FAERS extract for methimazole (Tapazole) (7,411 reports #352 of 524 by FAERS report count). 72% of sex-coded reports are female (4,801 F / 1,869 M). Sparse books still carry named reaction rows when present; not medical advice.
Counts from the openFDA FAERS extract (2004–2025). Stamps WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · FEMALE-LED.
FATIGUE leads 426 of 7,411 reports
FEMALE-LED reporters · age peak 45-64
Female-led reporters (72% of sex-coded rows)
Age peak 45-64 (1,729 reports)
FAERS filings rising toward 2025
Reactions in Death Reports
Death-mentioned subset is HEAVY here (615 reports, 8.3%). Top co-reported reactions in that subset - voluntary, not causal.
| Reaction | Reports |
|---|---|
| DEATH | 172 |
| CARDIAC ARREST | 50 |
| MULTIPLE ORGAN DYSFUNCTION SYNDROME | 38 |
| PNEUMONIA | 37 |
| RESPIRATORY FAILURE | 31 |
| AGRANULOCYTOSIS | 26 |
| ACUTE KIDNEY INJURY | 24 |
| CARDIOGENIC SHOCK | 23 |
| SEPTIC SHOCK | 23 |
| NEUTROPENIA | 22 |
| FATIGUE | 21 |
| COMPLETED SUICIDE | 19 |
| DYSPNOEA | 19 |
| SEPSIS | 19 |
| ATRIAL FIBRILLATION | 18 |
| DIARRHOEA | 18 |
| CARDIO-RESPIRATORY ARREST | 17 |
| HYPERTHYROIDISM | 17 |
Reactions in Hospitalization Reports
Hospitalization is HEAVY (2,710, 36.6% of the book). Top reactions in those rows:
| Reaction | Reports |
|---|---|
| HYPERTHYROIDISM | 206 |
| AGRANULOCYTOSIS | 185 |
| DYSPNOEA | 138 |
| FATIGUE | 133 |
| NAUSEA | 123 |
| PYREXIA | 115 |
| DIARRHOEA | 113 |
| ASTHENIA | 107 |
| FALL | 100 |
| PNEUMONIA | 99 |
| HEADACHE | 95 |
| THYROTOXIC CRISIS | 95 |
| DIZZINESS | 92 |
| PAIN | 90 |
| ANAEMIA | 89 |
| CARDIAC FAILURE | 88 |
| ATRIAL FIBRILLATION | 87 |
| WEIGHT DECREASED | 83 |
How to read methimazole FAERS figures (WATCHLIST · DEATH-HEAVY · HOSP-HEAVY)
FAERS holds 7,411 voluntary reports linked to methimazole (Tapazole), 2004-2025. Death is listed on 615 (8.3%). Hospitalization appears on 2,710 (36.6%). Top co-reported indication: Product Used For Unknown Indication.
Sparse extract - named reactions and FEMALE-LED skew still differ by drug; not a complete safety profile.
Read with methimazole
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 7,404 FAERS cases (Δ 7 lighter vs methimazole); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · FEMALE-LED.
ABS(total_reports) peer at 7,422 FAERS cases (Δ 11 heavier vs methimazole); DEATH-HEAVY · HOSP-MID · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · FEMALE-LED.
ABS(total_reports) peer at 7,398 FAERS cases (Δ 13 lighter vs methimazole); DEATH-HEAVY · HOSP-HEAVY · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · FEMALE-LED.
ABS(total_reports) peer at 7,386 FAERS cases (Δ 25 lighter vs methimazole); DEATH-MARKED · HOSP-MID · SEX-BALANCED vs this page's WATCHLIST · DEATH-HEAVY · HOSP-HEAVY · FEMALE-LED.
ABS(death_share) pole at 62.1% death-mentioned reports (Δ 53.8 pp vs methimazole's DEATH-HEAVY): CASELOAD · HOSP-MID.
methimazole stamps DEATH-HEAVY · HOSP-HEAVY; FAERS outcome shares are signal-detection rates, not incidence. Read them next to caseload WATCHLIST and the label guide.