Which among the following statement is/are valid about Propoxyphene?

Appeared in: AIIMS Raipur - 2017 (Shift-3)

Explanation

Propoxyphene is a weak opioid analgesic, but its overdose can lead to severe central nervous system (CNS) toxicity.
Seizures are a well-documented and life-threatening complication of propoxyphene overdose, along with respiratory depression and cardiac arrhythmias.
The toxic effects are often attributed to its major metabolite, norpropoxyphene, which has local anesthetic properties and blocks sodium channels.

Option A: Propoxyphene is a weak opioid, significantly less potent than oxycodone, which is a moderate-to-strong opioid.
Option B: Propoxyphene is an agonist at mu-opioid receptors, meaning it activates them to produce analgesia. An antagonist (like naloxone) blocks these receptors.
Option C: A classic side effect of all opioids, including propoxyphene, is constipation due to decreased gastrointestinal motility.

Visual 1: Table: Comparison of Opioid Properties (Propoxyphene vs. Oxycodone)
Visual 2: Diagram: Mechanism of action of opioid agonists vs. antagonists at the mu-receptor.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological properties and toxicity of Propoxyphene as background academic context rather than a clinical decision trigger.
Nurses must recognize that a propoxyphene overdose is a medical emergency requiring immediate intervention for seizures, respiratory support, and cardiac monitoring.
Due to its significant risk of fatal overdose and cardiotoxicity, propoxyphene has been withdrawn from the market in many countries (e.g., USA, UK, India). Nurses should be aware of its history and risks if encountered in rare situations or in patients obtaining it from illicit sources.
What if the patient took an overdose of Tramadol? Tramadol also lowers the seizure threshold and can cause seizures in overdose, similar to propoxyphene. It also carries a risk of serotonin syndrome, especially when combined with other serotonergic drugs.

How to Approach the Question

First, identify the core subject of the question: the drug Propoxyphene.
The question asks for a 'valid' statement, meaning you need to find the one factually correct option among the four.
Evaluate Option A: Compare the known potencies of propoxyphene and oxycodone. Recall that propoxyphene is classified as a weak opioid.
Evaluate Option B: Determine the drug's mechanism of action. Opioid analgesics are typically agonists that activate receptors.
Evaluate Option C: Consider the common gastrointestinal side effects of the opioid drug class.
Evaluate Option D: Recall the specific toxicity profile of propoxyphene, particularly in overdose situations. Its association with seizures is a key characteristic.

Concept Tested & Keywords

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Practise the full AIIMS Raipur - 2017 (Shift-3)

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