Naloxone Cloridrato Bambini Molteni (Naloxone Hydrochloride)

Naloxone is an opioid antagonist used to treat opioid overdose and related emergencies.

• Opioid overdose: rapid restoration of normal breathing and consciousness in patients experiencing life‑threatening respiratory depression.
• Opioid toxicity in emergency settings: reversal of sedation, miosis, and hypotension caused by opioid exposure.
• Post‑procedural opioid reversal: restores alertness after opioid‑based anesthesia or analgesia.

• Naloxone binds competitively to μ‑opioid receptors, as well as κ and δ receptors, with higher affinity than most opioid agonists. By displacing these agonists, it blocks receptor activation, halting the intracellular signaling that suppresses respiratory drive, analgesia, and central nervous system activity, thereby rapidly reversing opioid effects without stimulating the receptors itself.

Naloxone may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Nausea: transient feeling of sickness.
• Vomiting: occasional expulsion of stomach contents.
• Sweating: increased perspiration.
• Tachycardia: elevated heart rate.
• Hypertension: temporary rise in blood pressure.
• Agitation: restlessness or anxiety.

Serious or Rare Side Effects

• Acute pulmonary edema: fluid accumulation in the lungs.
• Severe hypertension or arrhythmias: dangerous blood pressure spikes or heart rhythm disturbances.
• Anaphylaxis: life‑threatening allergic reaction requiring immediate medical attention.

Naloxone should be used with careful clinical assessment and monitoring.

• Pregnancy: administer only if the expected benefit justifies the potential risk to the fetus.
• Breastfeeding: monitor the infant for signs of opioid withdrawal.
• Cardiovascular disease: observe blood pressure and heart rate for abrupt changes.
• Opioid dependence: be aware that naloxone can precipitate acute withdrawal symptoms.
• Allergy: avoid if the patient has a known hypersensitivity to naloxone.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Naloxone can interact with other medications, requiring attention to avoid reduced efficacy or adverse events.

Major Interactions (Avoid)

• Buprenorphine: may precipitate severe opioid withdrawal.
• Mixed agonist‑antagonist opioids (e.g., pentazocine): risk of abrupt withdrawal.
• High‑dose opioid infusion: may necessitate repeated naloxone dosing.

Moderate Interactions (Monitor Closely)

• Benzodiazepines or other sedatives: additive central nervous system depression.
• Tricyclic antidepressants: potential increase in cardiac arrhythmia risk.
• Antihypertensive agents: monitor for sudden blood pressure fluctuations.