 In healthy people, mean peak plasma concentrations following oral doses of 900 and 1000 mg of NAPA were 5.9 and 5.3 mg/L, and it attained 2.2 to 2.8 hours after administration.In a few patients with cardiomyopathy the mean peak plasma concentration was 5.6 mg/L 1.6 hours after ingestion.Acecainide has a bioavailability of 85%, with a mean peak plasma occurring between 45 and 90 minutes.