The study was conducted as an open label, balanced, randomised, two-treatment, two-period, two-sequence, single dose, crossover bioavailability study comparing acetaminophen 650 mg extended release gel tabs (containing acetaminophen 650 mg) of OHM Laboratories Inc. (subsidiary of Ranbaxy) with Tylenol 8 hour extended release gel tabs (containing acetaminophen 650 mg) of McNeil Consumer & Speciality Pharmaceuticals in healthy, adult, human, male subjects under fasting condition.