Relative risk of QTc interval prolongation with common antipsychotic agents.
|ECG required or strongly recommended before prescribing (most commonly associated with QTc interval prolongation and torsade de pointes)||Thioridazine|
Haloperidol in large doses IV (commonly ≥100 mg/d)
|Mild to moderate risk of QTc interval prolongation (~20 ms) when prescribed alone or with a metabolic inhibitor||Quetiapine|
|Little or no risk of QTc interval prolongation (~20 ms) when prescribed alone or with a metabolic inhibitor||Haloperidol (oral)|