Examples of SSRI, except?

Appeared in: NIMHANS Nursing Officer - 2021

Explanation

Selegiline is classified as a Monoamine Oxidase Inhibitor (MAOI), specifically a selective, irreversible inhibitor of MAO-B at lower doses.
Its primary mechanism involves preventing the breakdown of neurotransmitters, particularly dopamine, by inhibiting the monoamine oxidase enzyme.
This mechanism is distinct from that of SSRIs, which selectively block the serotonin transporter protein (SERT) to prevent serotonin reuptake.
Due to its different mechanism, Selegiline has a different side effect profile and set of drug/food interactions compared to SSRIs.

Why Other Options Were Wrong

Option A: Sertraline is a widely prescribed Selective Serotonin Reuptake Inhibitor (SSRI).
Option B: Citalopram is a well-known SSRI used for treating depression and anxiety disorders.
Option C: Fluoxetine is a prototypical SSRI and one of the first to be widely used in clinical practice.

Related Visual

A diagram comparing the mechanism of action at a neural synapse for an SSRI blocking the SERT protein on the presynaptic membrane versus an MAOI inhibiting the MAO enzyme ins...

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological classification of antidepressants (SSRIs vs. MAOIs) as background academic context rather than a clinical decision trigger.
Distinguishing between antidepressant classes like SSRIs and MAOIs is critical for safe nursing practice due to significant differences in side effects, administration, and drug/food interactions.
Patients on MAOIs like Selegiline must adhere to a strict low-tyramine diet (avoiding aged cheeses, cured meats, fermented products) to prevent a life-threatening hypertensive crisis. This dietary restriction is not required for SSRIs.
Nurses must educate patients about the risk of serotonin syndrome, a potentially fatal condition that can occur if MAOIs are taken with SSRIs or other serotonergic drugs without an adequate washout period.

How to Approach the Question

This is a knowledge-based question with a negative framing ('except'), which requires you to identify the outlier in a group.
First, identify the category given in the question stem: Selective Serotonin Reuptake Inhibitors (SSRIs).
Next, systematically review each option and determine its pharmacological classification.
Recall or deduce that Sertraline, Citalopram, and Fluoxetine are all common examples of SSRIs.
Identify Selegiline as belonging to a different class, the Monoamine Oxidase Inhibitors (MAOIs).
Since the question asks for the 'exception', the drug that is NOT an SSRI (Selegiline) is the correct answer.

Concept Tested & Keywords

Concept Tested: Pharmacological classification of antidepressants (SSRIs vs. MAOIs)
Stem keywords: SSRI, Sertraline, Citalopram, Fluoxetine, Selegiline
Lead-in keywords: except
Negative lead-in flag: Question asks for the EXCEPTION

Question ID

QgSwmMtIEnKMHsQC2oxaXd

Reference Book

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 9854-9856

E6 Pharmacology KD Tripathi Essentials 9e Part 2 p. 124-126

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