BTSC 3 August 2025
Pharmacology
Easy
The anxiolytics drugs mainly work by affecting which of the following neurotransmitters
in the brain?
Appeared in: BTSC 3 August 2025
Explanation
- Anxiolytic drugs, especially classic agents like benzodiazepines, primarily work by enhancing the effects of Gamma-Aminobutyric Acid (GABA).
- GABA is the principal inhibitory neurotransmitter in the central nervous system (CNS). Its function is to reduce neuronal excitability throughout the nervous system.
- By potentiating GABA, these drugs increase chloride ion influx into neurons, which hyperpolarizes the cell membrane and produces a calming, anxiolytic effect.
Why Other Options Were Wrong
- Option A: Acetylcholine is primarily involved in cognitive functions like memory and learning, as well as muscle control at the neuromuscular junction. It is not the main target for anxiolytic drugs.
- Option B: While medications that modulate serotonin (like SSRIs) are a first-line treatment for long-term management of anxiety disorders, they are not the primary mechanism for rapid-acting anxiolytics like benzodiazepines.
- Option C: Dopamine pathways are mainly associated with reward, motivation, and motor control. Dysregulation of dopamine is implicated in psychosis and Parkinson's disease.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mechanism of action of anxiolytic drugs as background academic context rather than a clinical decision trigger.
- A critical nursing responsibility is patient education regarding the synergistic effects of anxiolytics and other CNS depressants, such as alcohol, opioids, or antihistamines. Combining them can lead to life-threatening respiratory depression.
- Nurses must monitor for signs of tolerance and dependence, especially with benzodiazepines. It is vital to teach patients that these medications should not be stopped abruptly and must be tapered under medical supervision to prevent severe withdrawal symptoms.
- What if? If a patient has a history of substance abuse, a benzodiazepine would be a high-risk choice. A clinician would likely prefer a non-benzodiazepine anxiolytic like buspirone (which acts on serotonin receptors) or an SSRI to manage anxiety without the high potential for dependence.
How to Approach the Question
- First, identify the core of the question, which is asking for the primary neurotransmitter targeted by anxiolytic drugs.
- Mentally categorize the options by their main function: Acetylcholine (cognition, muscle), Serotonin (mood, long-term anxiety), Dopamine (psychosis, reward), and GABA (inhibition).
- Recall that the classic, rapid-acting anxiolytics (like Valium or Xanax) are benzodiazepines.
- Connect benzodiazepines to their well-known mechanism of action: enhancing the effect of the brain's main 'brake' pedal, the inhibitory neurotransmitter GABA.
- Differentiate this from SSRIs, which affect serotonin and are used for chronic anxiety, but are not the answer to a general question about 'anxiolytics' which often implies the classic, fast-acting class.
- Select GABA as the most accurate answer representing the primary mechanism for this drug class.
Concept Tested & Keywords
- Concept Tested: Mechanism of action of anxiolytic drugs
- Stem keywords: anxiolytics drugs, neurotransmitters, brain
- Lead-in keywords: mainly work by affecting
- Negative lead-in flag: false
Question ID
Q3A2YqwxOuaB80s1Xq8aFe
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. 5777-5779, 418-420, 5779-5781
Practise the full BTSC 3 August 2025
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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