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Difficulty: HardPsychopharmacology and Psychological Therapies

You are evaluating five different patients who have recently initiated psychotropic medications. Each patient is now presenting with a specific adverse effect based on their history and examination findings. Which primary pharmacological mechanism best corresponds to the responsible medication for each patient's clinical presentation?

  • A 32-year-old woman with bulimia nervosa and normal vital signs presents with postictal confusion following a generalized tonic-clonic seizure shortly after starting a new antidepressant.Inhibition of presynaptic reuptake of norepinephrine and dopamine
  • A 45-year-old man with depression and severe insomnia presents in acute distress with a painful, sustained penile erection lasting 6 hours after taking a newly prescribed sleep aid.Serotonin reuptake inhibition combined with prominent alpha-1 adrenergic receptor antagonism
  • A 29-year-old woman with treatment-resistant depression presents with diaphoresis, severe anxiety on mental status exam, and a blood pressure of 220/115 mm Hg after attending a wine and aged cheese tasting.Irreversible inhibition of monoamine oxidase A and B enzymes
  • A 55-year-old man with major depressive disorder and diabetic neuropathy presents with a euthymic mood but new-onset resting hypertension (155/95 mm Hg) following a dose increase of his medication.Serotonin reuptake inhibition with dose-dependent presynaptic norepinephrine reuptake inhibition
  • A 24-year-old man treated for depression presents with significant recent weight gain (5 kg) and complains of profound daytime sedation and dizziness upon standing (orthostatic hypotension).Central alpha-2 adrenergic receptor antagonism and potent histamine H1 receptor blockade

Answer

Match each clinical presentation to the underlying mechanism of action of the responsible psychotropic medication: 1-Bupropion, 2-Trazodone, 3-MAOI, 4-SNRI, 5-Mirtazapine.
Bupropion causes seizures in patients with eating disorders due to NE/DA reuptake inhibition. Trazodone causes priapism via alpha-1 antagonism. MAOIs cause tyramine hypertensive crisis by inhibiting monoamine oxidase. SNRIs like venlafaxine cause dose-dependent hypertension via NE reuptake inhibition. Mirtazapine causes sedation, weight gain, and orthostasis via H1 and alpha-1/alpha-2 antagonism.

Step-by-Step Solution

1
Analyze each clinical vignette to identify the specific psychotropic medication based on the unique adverse effect profile and the patient's history.
Identified medications: Bupropion (Left 1), Trazodone (Left 2), MAOI (Left 3), Venlafaxine/SNRI (Left 4), Mirtazapine (Left 5).
Recognizing the classic clinical presentation of drug-specific side effects is required before determining the mechanism of action.
2
Determine the pharmacological mechanism of action for each identified medication.
Bupropion inhibits NE/DA reuptake. Trazodone inhibits serotonin reuptake and blocks alpha-1 receptors. MAOIs irreversibly inhibit monoamine oxidase. Venlafaxine inhibits serotonin and dose-dependently inhibits NE reuptake. Mirtazapine blocks alpha-2 and H1 receptors.
Understanding the receptor-level activity explains why these specific adverse effects occur in these clinical scenarios.
3
Map the identified mechanism of action to the corresponding right item for each patient scenario.
All 5 pairs are successfully matched according to their pharmacological profiles.
This completes the matching process by synthesizing clinical diagnostics with neuropharmacology.

Key Concept

The mechanisms of action of psychotropic medications directly correlate with their unique and potentially dangerous adverse effect profiles.
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Topics

Psychopharmacology and Psychological Therapies

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