An open label, balanced, randomized, two-treatment, two-period, two-sequence, single-dose, crossover, bioequivalence study comparing Naltrexone hydrochloride film-coated tablet, 50 mg, manufactured by Sun Pharmaceutical Industries Limited, India with NALTREXONE GH (naltrexone hydrochloride) film-coated tablets 50 mg, Product of Generic Health Pty Ltd Suite 2, Level 2 19-23 Prospect Street Box Hill, VIC, 3128, Australia, in healthy adult, human subjects under fasting condition.