Nalox 400mcg Injection is used in the following:

• Reversal of opioid overdose
• Neonatal abstinence syndrome (NAS)
• Combination with opioid maintenance therapy
• Pain management reversal

Nalox 400mcg Injection is an opioid receptor antagonist that competitively binds to and blocks the activity of opioid receptors in the central nervous system. By displacing opioids like heroin, morphine, or fentanyl from these receptors, it rapidly reverses the effects of opioids, including respiratory depression, sedation, and analgesia. This competitive binding restores normal respiratory function and consciousness, making it a life-saving intervention in opioid overdose situations. 

Inform the doctor about your medicines, including prescription, over-the-counter, nutritional or vitamin supplements, and herbal products. Certain medications may interact with Nalox 400mcg Injection, reducing effectiveness by causing undesirable side effects. 

• Store at room temperature, between 20-25°C
• Keep away from moisture, heat, and light.
• It should not be frozen.
• Keep away from children and pets.

Nalox 400mcg Injection is administered intravenously (IV), intramuscularly (IM), intranasally (through the nose), or subcutaneously (under the skin). The choice of administration route may depend on the situation and the training level of the person providing the medication.

Nalox 400mcg Injection causes some side effects like all medications, although not everyone will experience them. 

Serious:

• Opioid withdrawal

Common:

• Nasal irritation
• Increased heart rate
• Nausea or vomiting
• Sweating
• Restlessness or agitation
• Muscle aches or pains
• Hypertension (high blood pressure)

Those administering Nalox 400mcg Injection should be prepared to manage withdrawal symptoms if they occur. When using it as a nasal spray, ensure the nozzle is not obstructed and the spray is delivered correctly into the nostrils for optimal effectiveness. In cases of severe opioid overdose, multiple doses of naloxone may be necessary due to the duration of action of some opioids. This should be done under medical supervision, as its effects can wear off before the opioids have cleared the system. It should not be used if it is past its expiration date, as expired medication may not be as effective in reversing an overdose.  Be aware of any allergies to this medication. Recognize that individual responses to this medication may vary; some require higher or more frequent doses. 

1. Mercury Pharma International Ltd, Electronic Medicines Compendium (EMC), [Revised on 19th Nov 2019] [Accessed on 27th Sept 2023], https://www.medicines.org.uk/emc/product/3590/pil#gref
2. Christian Lüscher, Drugs of Abuse, Lange’s Basic and Clinical Pharmacology, 14th Edition, 2018, 575-589.