AIIMS Delhi NO- 2019
Pharmacology
Medium
Which of the psychiatric drug does not need any test dose before starting routine dose?
Appeared in: AIIMS Delhi NO- 2019
Explanation
- Quetiapine does not require a specific 'test dose' before starting treatment.
- Initiation follows a standard 'start low, go slow' titration schedule, typically beginning at 25 mg twice a day and increasing gradually.
- This approach is designed to improve tolerability and manage common side effects like sedation and orthostatic hypotension.
- Unlike other antipsychotics, there is no requirement for a test dose to check for acute reactions or a mandatory, drug-specific monitoring protocol like with Clozapine.
Why Other Options Were Wrong
- Option A: The long-acting injectable (LAI) form of Haloperidol, Haloperidol Decanoate, requires careful initiation. Often, tolerability is first established with the oral form of the medication before administering the injection.
- Option B: The long-acting injectable (LAI) form, Risperdal Consta, requires a 3-week period of oral risperidone supplementation after the first injection. This is to ensure therapeutic blood levels are maintained while the LAI reaches a steady state and also serves as a test of tolerability.
- Option C: Clozapine has the most stringent and complex initiation protocol of any antipsychotic. It requires mandatory baseline and regular (initially weekly) monitoring of white blood cell (WBC) and absolute neutrophil count (ANC) due to the life-threatening risk of agranulocytosis.
Related Visual
Clinical Relevance
- Nursing practice connection: Safe nursing care depends on performing Initiation protocols and safety monitoring for antipsychotic medications in the correct sequence, documenting the action clearly, and monitoring for the expected response.
- Understanding the specific initiation protocols for antipsychotics is a critical nursing responsibility for patient safety.
- For Clozapine, the nurse must verify that the required blood work has been completed and the results are within the acceptable range before administering each dose. Failure to adhere to this protocol can be fatal.
- Nurses must educate patients on the importance of these protocols, such as adhering to blood test schedules for Clozapine or understanding the oral supplementation period for LAIs.
How to Approach the Question
- First, identify the core of the question: it asks which drug does NOT need a special initiation step, like a test dose. This is a negative question, meaning you are looking for the exception.
- Review the options and recall any specific safety warnings or administration protocols associated with them.
- Consider Clozapine first, as it is well-known for its unique and strict safety protocol (agranulocytosis risk and mandatory blood monitoring). This immediately eliminates it as the answer.
- Next, think about Haloperidol and Risperidone. Consider their different formulations, especially the long-acting injectables (LAIs), which often have special initiation requirements like oral supplementation to test tolerability.
- Evaluate Quetiapine. Its initiation is generally a straightforward dose titration ('start low, go slow') to manage side effects like sedation, without a required test dose or complex monitoring like Clozapine.
- By comparing the initiation requirements, you can conclude that Quetiapine has the most direct start, making it the correct answer.
Concept Tested & Keywords
- Concept Tested: Initiation protocols and safety monitoring for antipsychotic medications.
- Stem keywords: psychiatric drug, test dose, routine dose
- Lead-in keywords: does not need
- Negative lead-in flag: The question asks which drug does NOT require a test dose, framing it negatively.
Question ID
QpZjuAsBVQN4yWkR8j2Yi
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) pp. 5068-5070, 9976-9978, 9993-9995
Practise the full AIIMS Delhi NO- 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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