Frequency of antithyroid drug adverse events
| Frequency | Adverse event |
| Common (1.1%–11%) | Skin rash Arthralgia/myalgia Neutropenia/leucopenia |
| Rare (0.2%–1%) | Liver transaminase elevation Headache Gastrointestinal complaints Agranulocytosis Hair loss Fever Sore throat |
| Very rare (<0.1%) | Aplastic anaemia Thrombocytopenia Cholestatic jaundice/hepatitis |