Treatment & Safety
Naltrexone Contraindications: Opioids, Withdrawal, and Label Checks
Current opioid use, opioid dependence, acute withdrawal, specified test results, and prior hypersensitivity can make naltrexone unsafe to start.
Treatment & Safety
Safety checks, formulation administration, side effects, contraindications, and special clinical circumstances.
Treatment & SafetyStarting Naltrexone After Opioids: Why the Opioid-Free Interval Matters
Naltrexone can trigger severe withdrawal if opioids are still present. The minimum interval is not a self-assessment rule and may be longer after buprenorphine or methadone.
Treatment & SafetyNaltrexone Side Effects: Expected Effects and Urgent Safety Signals
Nausea, headache, dizziness, and tiredness are reported with naltrexone. Vivitrol also has injection-site effects; certain symptoms need prompt clinical review.
Treatment & SafetyVivitrol Injection Administration: What Patients Should Know
Vivitrol is prepared and given only by a healthcare provider as a deep gluteal injection. This guide explains the patient-facing safety essentials.
Treatment & SafetyNaltrexone and Liver Disease: What Current Evidence Shows
Observational studies are reassuring in many patients with liver disease and cirrhosis, but they do not make naltrexone risk-free or settle every decompensated-liver scenario.
Treatment & SafetyNaltrexone During Pregnancy and Breastfeeding: What We Know
Human pregnancy evidence remains limited; breastfeeding transfer appears low in one published case. Decisions require individual specialist assessment.