3/04/2026

Flecainide Dose (Lexicomp, accessed on 3/4/2026)

Newborn:

Initial: 2 mg/kg/day in 2 divided doses.

Usual effective dose: 3.35 ± 1.3 mg/kg/day.

 

Children:

Initial: 1-3 mg/kg/day (or) 50 – 100 mg/m2/day in 3 divided doses.

Max: 8 mg/kg/day (or) 200 mg/m2/day.

Usual effective dose: 4 mg/kg/day (or) 140 mg/m2/day.

 

Adults:

Initial: 50 mg q12 or 100 mg qd.

Increase dose Q4 days, Max. 300 mg/day for SVT & 400 mg/day for VT.

Pill-in-pocket for A fib: 200 mg (< 70 kg) & 300 mg (> 70 kg). Patient should be on AV nodal blocking agent (Beta-blocker or Calcium-channel blocker) while on this plan. Inpatient trial should be done prior to discharge to check its efficacy.

 

Monitor: 

EKG, Serum trough level. LFT, CBC/diff.

Serum trough level – Check 3 days after of starting or changing medication.

Therapeutic level: 0.2 – 1.0 mcg/ml.

In children, response is noted at 0.2 – 0.5 mcg/ml range.

No comments: