Naltrexone Accord (Naltrexone Hydrochloride)

Naltrexone acts on the opioid system and is used in the treatment of dependence syndromes.

• Alcohol dependence: reduces craving and consumption, supporting sustained abstinence.
• Opioid dependence: blocks opioid receptors to prevent reinforcing effects and aid in maintenance therapy.
• Alcohol use disorder: helps maintain sobriety by attenuating reward pathways.
• Opioid use disorder: facilitates detoxification by preventing opioid‑induced euphoria.

• Naltrexone is a competitive antagonist at the mu, kappa and delta opioid receptors. By binding to these receptors without activating them, it blocks the effects of both endogenous opioids and exogenous opioid agonists, thereby diminishing the rewarding and reinforcing properties of alcohol and opioid substances and reducing cravings.

Naltrexone may be associated with a range of adverse reactions, which are classified by frequency and severity.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Headache: transient tension‑type headaches.
• Dizziness: occasional light‑headedness.
• Fatigue: feeling of reduced energy.
• Insomnia: difficulty initiating or maintaining sleep.
• Abdominal pain: mild discomfort in the stomach area.

Serious or Rare Side Effects

• Hepatotoxicity: elevated liver enzymes or liver injury.
• Severe allergic reaction: rash, swelling, or anaphylaxis.
• Depression or suicidal thoughts: mood changes requiring immediate medical attention.

When prescribing Naltrexone Accord, clinicians should observe several precautionary measures to ensure safe use.

• Liver function assessment: evaluate hepatic enzymes before initiating therapy.
• Depression monitoring: watch for worsening mood or suicidal thoughts.
• Acute opioid withdrawal: avoid use during active withdrawal as it may precipitate severe symptoms.
• Renal impairment: adjust use in patients with significant kidney disease.
• Hypersensitivity: discontinue if allergic reaction occurs.
• Store at ambient temperature: keep in original packaging, protect from moisture and light.

Naltrexone can interact with several medicines; some combinations should be avoided while others require careful monitoring.

Major Interactions (Avoid)

• Opioid agonists (e.g., morphine, oxycodone): antagonized effect may precipitate withdrawal.
• Opioid‑containing cough medicines: can reduce analgesia and cause abrupt withdrawal.
• Disulfiram: combined hepatotoxic risk may increase liver injury.

Moderate Interactions (Monitor Closely)

• Benzodiazepines: additive CNS depression may require dose adjustment.
• Antidepressants (e.g., SSRIs): monitor for mood changes and rare serotonin syndrome.