When Is Naltrexone Therapy Not Suitable?

Naltrexone therapy may not be recommended in individuals with acute hepatitis or liver failure. Pregnant or breast-feeding mothers should consult with their physician before beginning Naltrexone therapy. Naltrexone is not suitable for people who are actively taking opiates within the period leading up to their treatment – for opiates or heroin, 7 days before, and 10-14 days before for Suboxone, Subutex and Methadone.