Other individual factors that influence how long naltrexone stays in the system can include body mass and hydration level. People with a faster metabolism will eliminate naltrexone more quickly than someone with a slower metabolism. Ms Naltrexone 93 Usd Per Mg 1 tablet (naltrexone 8 mg/bupropion 90 mg) twice daily. Naltrexone and bupropion half life . Two tablets (naltrexone 16 mg/bupropion 180 mg) twice daily (maximum dose: Naltrexone 32 mg/bupropion 360 mg/day). Current use of ldn therapy in the practice of medicine Excretion is mostly renal as metabolite, less than 2% as unchanged drug. The injectable form of drug. 2005 this opioid antagonist has also been used in the management of autism. Concomitant use with cyp2b6 inhibitors (eg, ticlopidine, clopidogrel): Drug dosage dose form cost* naltrexone/bupropion (contrave) 8/90 mg per day, increasing over four weeks to 16/180 mg twice daily. Information updating the adverse effects after fda approval of er naltrexon...