Which among the following drug is used in case of enuresis and chronic pain?

AIIMS Raipur - 2017 (Shift-3)

Pharmacology

Easy

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

Explanation

Imipramine is a tricyclic antidepressant (TCA) with established efficacy in treating both enuresis and chronic pain.
For enuresis, its anticholinergic effects increase bladder capacity and reduce involuntary bladder contractions, making it a third-line treatment option.
For chronic neuropathic pain, imipramine works by inhibiting the reuptake of norepinephrine and serotonin, which modulates pain signals in the central nervous system.
It is FDA-approved for childhood enuresis and has been used for this indication for decades.

Option B: Phenelzine is a non-selective Monoamine Oxidase Inhibitor (MAOI). Its primary use is for atypical depression and it is not indicated for enuresis or chronic pain.
Option C: Selegiline is a selective MAO-B inhibitor. Its main therapeutic use is in the management of Parkinson's disease, where it helps to increase dopamine levels in the brain.
Option D: Bupropion is a norepinephrine-dopamine reuptake inhibitor (NDRI). It is primarily used for major depressive disorder and as an aid for smoking cessation.

Visual 1: Diagram: A flowchart showing the different classes of antidepressant medications (TCAs, MAOIs, SSRIs, NDRIs) and their primary clinical indications.
Visual 2: Infographic: A visual summary of Imipramine's dual mechanism of action in treating enuresis (anticholinergic effect on bladder) and chronic pain (neurotransmitter modulation).

Clinical Relevance

Nursing practice connection: Knowing Pharmacology: Indications for Antidepressant Medications helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must educate parents about the potential cardiac side effects of imipramine, such as heart rhythm changes. A baseline ECG is often recommended before starting therapy, especially at higher doses.
Patient safety is critical. Imipramine is highly toxic in overdose. Nurses must instruct families to store the medication securely and out of reach of children to prevent accidental poisoning.
What if? If a child on imipramine for enuresis develops anxiety, insomnia, and dry mouth, the nurse should recognize these as common side effects and report them to the prescriber. A dose adjustment or tapering might be necessary.

How to Approach the Question

First, identify the key conditions mentioned in the question: 'enuresis' (bedwetting) and 'chronic pain'.
Next, analyze the drug options provided. Recognize that they are all psychotropic medications, mostly antidepressants from different classes.
Recall the primary indications and common off-label uses for each class of antidepressant. Think beyond just depression.
Consider the tricyclic antidepressant (TCA) class. Remember that TCAs have multiple uses due to their broad mechanism of action, including effects on various neurotransmitters and receptors.
Evaluate each option: Imipramine is a TCA known for these specific off-label uses. Phenelzine and Selegiline are MAOIs with different profiles. Bupropion is an NDRI with distinct uses (smoking cessation).
Select the drug that matches both conditions listed in the stem. Imipramine is the only option that fits both enuresis and chronic pain management.

Concept Tested & Keywords

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