Cardiology | Antiarrhythmic Drug Guide | Class Ib | Mexiletine


IV Dose No IV form
Oral dose Children: 1.4-5.1 mg/kg/dose, given q 8 hours.
May increase to 8.0 mg/kg/dose in infants.
Adults: 450-1200 mg/day divided TID
Levels 0.8-2.0 ug/ml
Poor correlation with therapeutic efficacy
Kinetics Elimination half-life 6.3-11.8 hours in adults
Increased to 15.4 hours in heart failure.
Peak levels 1-3 hours after oral dose
Interactions Phenytoin, rifampin increase clearance
Preparations Mexitil capsules: 150, 200, 250 mg
FDA approval in children no

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