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Difficulty: MediumPsychopharmacology and Psychological Therapies

Match each clinical presentation of a severe adverse drug reaction to the psychotropic medication most likely responsible.

  • A 28-year-old woman with bipolar disorder presents with a rapidly spreading, blistering rash and mucosal ulcerations. Vitals: T 38.2°C (100.8°F), HR 105/min. Mental status: anxious but oriented. Symptoms began shortly after her medication dose was aggressively increased.Lamotrigine
  • A 34-year-old man with treatment-resistant schizophrenia develops a severe sore throat and chills. Vitals: T 39.4°C (102.9°F), HR 112/min. Mental status: baseline restricted affect. Laboratory testing reveals an absolute neutrophil count of 300/mm³.Clozapine
  • A 42-year-old man on maintenance therapy for bipolar disorder complains of urinating up to 7 liters of dilute urine daily. Vitals: BP 110/70 mm Hg, HR 88/min. Mental status: cooperative, euthymic mood. Serum sodium is 146 mEq/L.Lithium
  • A 22-year-old woman with bipolar disorder presents with severe epigastric pain radiating to the back and intractable nausea. Vitals: T 37.8°C (100.0°F), HR 115/min. Mental status: distressed and tearful. Serum lipase is markedly elevated.Valproate
  • A 45-year-old man with major depressive disorder presents with palpitations, neck stiffness, and profuse sweating shortly after eating aged meats and cheeses. Vitals: BP 215/125 mm Hg, HR 122/min. Mental status: highly anxious.Phenelzine

Answer

The blistering mucosal rash matches with Lamotrigine; the fever and severe neutropenia match with Clozapine; the massive output of dilute urine matches with Lithium; the epigastric pain with elevated lipase matches with Valproate; and the hypertensive crisis matches with Phenelzine.
Each clinical vignette describes a classic, severe adverse effect uniquely associated with a specific psychotropic medication. Recognizing these distinct toxicities is crucial because they require immediate discontinuation of the offending agent and specialized supportive care.

Step-by-Step Solution

1
Evaluate the first vignette (blistering rash, mucosal ulcerations, fever after rapid medication increase).
Diagnose Stevens-Johnson syndrome, which is strongly associated with rapid titration of Lamotrigine.
Lamotrigine requires a strict, slow titration schedule to mitigate the high risk of severe dermatologic reactions.
2
Evaluate the second vignette (fever, sore throat, and dangerously low absolute neutrophil count).
Diagnose agranulocytosis, an idiosyncratic reaction strongly associated with Clozapine.
Clozapine carries a black box warning for severe neutropenia and agranulocytosis, necessitating mandatory registry and regular hematologic monitoring.
3
Evaluate the third vignette (excessive thirst, polyuria of dilute urine, mild hypernatremia).
Diagnose nephrogenic diabetes insipidus, a very common complication of Lithium.
Lithium antagonizes antidiuretic hormone (ADH) in the renal collecting tubules, impairing the kidney's ability to concentrate urine.
4
Evaluate the fourth vignette (epigastric pain radiating to the back, nausea, elevated lipase).
Diagnose acute pancreatitis, a known, potentially fatal adverse effect of Valproate.
Valproic acid has a distinct black box warning for acute pancreatitis, which can occur at any point during treatment.
5
Evaluate the fifth vignette (severe hypertension, palpitations, and diaphoresis after consuming aged foods).
Diagnose tyramine-induced hypertensive crisis.
MAOIs such as phenelzine prevent the breakdown of dietary tyramine, leading to massive catecholamine release and severe hypertension.

Key Concept

Identifying severe, life-threatening adverse effects of psychotropic medications
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Topics

Psychopharmacology and Psychological Therapies

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