Which is an antidote of opioid overdose?

Appeared in: NORCET-7 Mains-2024

Explanation

Naloxone is a pure opioid antagonist, making it the specific antidote for opioid overdose.
It works by competing with opioids for receptor sites in the central nervous system, primarily the mu-receptors, effectively displacing them.
This action rapidly reverses the life-threatening effects of the opioid, especially respiratory depression.

Option A: Protamine sulphate is an antidote, but it specifically counteracts the anticoagulant effects of heparin.
Option C: Deferoxamine is a chelating agent, which means it binds to heavy metals in the body. It is not an opioid antagonist.
Option D: Magnesium sulfate (MgSO4) is a therapeutic medication, not an antidote for opioids. Its own toxicity is reversed by Calcium Gluconate.

Visual 1: Table: A clear table listing common toxins/drugs (e.g., Opioids, Benzodiazepines, Heparin, Warfarin, Acetaminophen) in one column and their corresponding specific antidotes (e.g., Naloxone, Flumazenil, Protamine Sulfate, Vitamin K, N-Acetylcysteine) in the adjacent column.
Visual 2: Diagram: A simple infographic illustrating the mechanism of action, showing opioid molecules attached to brain receptors, and then Naloxone molecules displacing them, leading to the reversal of effects.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology: Antidotes for Drug Overdose as background academic context rather than a clinical decision trigger.
Rapid recognition of opioid overdose symptoms (pinpoint pupils, respiratory depression, unconsciousness) is a critical nursing skill for timely intervention with naloxone.
Nurses must be aware that naloxone has a shorter half-life than many opioids (e.g., methadone). The patient may relapse into respiratory depression after the naloxone wears off, requiring repeated doses and continuous monitoring.
In many regions, naloxone is available over-the-counter or through community programs to be administered by first responders or family members, highlighting its importance in public health.

How to Approach the Question

This is a factual recall question from the subject of pharmacology.
First, identify the key terms in the question stem: 'antidote' and 'opioid overdose'.
The question asks for the specific substance that reverses the effects of an opioid overdose.
Systematically review the options provided, recalling the primary indication for each.
Recall that Naloxone is the classic opioid antagonist.
Eliminate the other options by identifying their specific uses: Protamine sulphate for heparin, Deferoxamine for iron, and MgSO4 as a therapeutic agent for conditions like eclampsia.

Concept Tested & Keywords

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