Reference Range
Flecainide is used mainly for treatment and prevention of ventricular arrhythmia, paroxysmal supraventricular tachycardia, paroxysmal atrial fibrillation, and paroxysmal atrial flutter.
In adults, the reference range of the therapeutic trough of flecainide is 0.2-1 µg/mL.
In children, the reference range of the therapeutic trough is 200-800 ng/mL, although concentrations of up to 800 ng/mL may be required for adequate control in some children.