Procainamide was administered to a patient as a constant rate iv infusion of 2 mg/min to control his ventricular arrhythmia. The steady state procainamide concentration was found to be 4 mg/L. Because the patient condition was not controlled, the physician asked you to recommend an infusion rate that will increase the steady state plasma procainamide concentration in this patient to 6 mg/L. What will be your recommendation?