A psychiatric patient with schizophrenia is taking the antipsychotic drug clozapine. Which of the following is a serious potential side effect of Clozapine treatment?

1. A

   Increased appetite

2. B

   Agranulocytosis

3. C

   Enhanced memory

4. D

   Mild drowsiness

Appeared in: NORCERT 8 Mains-2025

Explanation

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• Agranulocytosis is a severe, life-threatening adverse effect characterized by a drastic reduction in white blood cells, specifically neutrophils.
• This side effect is a hallmark risk of Clozapine, distinguishing it from many other antipsychotics.
• Due to this risk, mandatory and strict hematological (blood count) monitoring is required for all patients receiving Clozapine.
• Patients must be registered in a special program (like the Clozapine REMS program in the US) to ensure monitoring compliance (SRC_1).

Why Other Options Were Wrong

• Option A: While increased appetite and subsequent weight gain are very common side effects of Clozapine, they are considered metabolic issues and are not as acutely life-threatening as agranulocytosis.
• Option C: Clozapine, like other antipsychotics, does not enhance memory. Cognitive side effects, though sometimes less severe with atypical agents compared to typical ones, can still occur.
• Option D: Mild drowsiness or sedation is a very common side effect, particularly at the beginning of treatment, but it is not considered a 'serious' adverse event in the same way as a life-threatening blood disorder.

Related Visual

• Visual 1: Flowchart: Clozapine Monitoring Protocol - Illustrating the required frequency of WBC/ANC testing from initiation (weekly for 6 months) to maintenance phases.
• Visual 2: Infographic: Signs of Agranulocytosis - A patient-friendly visual listing key symptoms to report immediately, such as fever, sore throat, chills, and weakness.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Serious adverse effects of Clozapine to guide bedside assessment, documentation, and the next nursing action.
• The nurse's primary role in Clozapine therapy is vigilant monitoring and patient education. This includes ensuring blood tests are done on schedule and teaching the patient to recognize and report signs of infection immediately.
• Failure to detect agranulocytosis early can be fatal. Nurses are the frontline defense in preventing this outcome.
• In many countries, there are national registries for patients on Clozapine to ensure strict adherence to monitoring protocols. Nurses are key to implementing and documenting this.

How to Approach the Question

• First, identify the key elements of the question: the drug is 'Clozapine' and the question asks for a 'serious potential side effect'.
• This is a pharmacology recall question. Access your knowledge about Clozapine, a unique atypical antipsychotic.
• Evaluate the options based on severity. 'Increased appetite' and 'mild drowsiness' are common but generally not life-threatening.
• 'Enhanced memory' is inconsistent with the known effects of antipsychotics.
• 'Agranulocytosis' is a well-known, life-threatening blood disorder specifically linked to Clozapine.
• Therefore, select the most severe, life-threatening option that is a known risk of the specified drug.

Concept Tested & Keywords

• Concept Tested: Serious adverse effects of Clozapine
• Stem keywords: psychiatric patient, schizophrenia, clozapine, antipsychotic drug
• Lead-in keywords: serious potential side effect

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