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Naltrexone
Pronounced nal-TREX-one
Brand names: Vivitrol, ReVia
Type: Opioid blocker (addiction treatment) · All Pain Relief & Fever Medicines
What Naltrexone is used for
- Preventing relapse in opioid use disorder after detox
- Alcohol use disorder
Common side effects
- Nausea
- Headache
- Dizziness
- Injection site reactions (monthly injection)
Important cautions
- Blocks opioid pain medicines — anyone taking it must tell surgical and emergency teams, and carry this information
- Trying to overcome the blockade with large amounts of opioids can be fatal, and sensitivity to opioids increases after stopping
How it comes
Tablets, monthly injection (clinic). This guide lists forms only — it never lists strengths or doses.
Related medicines — Pain Relief & Fever Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.