Bioavailability Study of Risperidone Orally Disintegrating Tablets 1 mg of Dr.Reddy's Laboratories Limited Under Fasting Conditions

Inclusion Criteria: Subjects were included in the study only if they met all of the following criteria: * Healthy non-smoking (for at least 3 months) adult male volunteers, 18-45 years of age; * Weighing at least 60 kg for males and within 15% of their ideal weights (Table of "Desirable Weights of Adults", Metropolitan Life Insurance Company, 1983); * Medically healthy subjects with clinically normal laboratory profiles and ECGs; * Voluntarily consent to participate in the study. Exclusion Criteria: Subjects were excluded from the study if there was evidence of any of the following at screening or at any time during the study: * History or presence of significant cardiovascular, pulmonary, hepatic, renal, hematologic, gastrointestinal, endocrine, immunologic, dermatologic,neurologic, or psychiatric disease. * In addition, history or presence of: * alcoholism or drug abuse within the past year; * hypersensitivity or idiosyncratic reaction to risperidone or benzodiazepines or other antipsychotic drugs; * seizures; * glaucoma or hypermetropia. * Positive results on Human Immunodeficiency Virus (HIV), Hepatitis B Surface Antigen (HbsAg) and Hepatitis C Virus (HCV) Tests. * Subjects whose sitting blood pressure is less than 110/60 mm Hg at screening or 100/55 mm Hg before dosing. * Subjects whose pulse is lower than 55 b.p.m. at screening or 50 b.p.m. prior to dosing. Subjects whose PR interval is ≥ 190 msec at screening and prior to dosing. * Subjects whose aTe interval is \> 450 msec at screening and prior to dosing. * Subjects with a body temperature ≥38°C before dosing. * Subjects who have used any drugs or substances known to be strong inhibitors of CYP enzymes (formerly known as cytochrome P450 enzymes) within 10 days prior to the first dose. * Subjects who have used any drugs or substances known to be strong inducers of CYP enzymes (formerly known as cytochrome P450 enzymes) within 28 days prior to the first dose. * Subjects who have been on a special diet (for whatever reason) during the 28 days prior to the first dose and throughout the study. * Subjects who, through completion of the study, would have donated in excess of: 500 mL of blood in 14 days, or 1500 mL of blood in 180 days, 2500 mL of blood in 1 year. * Subjects who have participated in another clinical trial within 28 days prior to the first dose.