Anxiety and sleep disorders: pharmacotherapy MCQs With Answer

Introduction:

Anxiety and sleep disorders are among the most common reasons patients seek pharmacologic treatment. This collection of MCQs is designed for M.Pharm students preparing for Pharmacotherapeutics II (MPP 202T), focusing on mechanisms, comparative pharmacology, clinical use, adverse effects, drug interactions and special-population considerations. Questions probe deeper than superficial facts — addressing receptor pharmacodynamics (GABA-A subunits, 5-HT receptors, orexin pathways), pharmacokinetics (CYP metabolism, half-life implications), guideline-based first-line choices, and safe prescribing strategies including tapering and alternatives for the elderly or pregnant patients. Use these MCQs to test clinical reasoning and therapeutic decision-making in anxiety and insomnia management.

Q1. Which molecular action best explains the rapid sedative-hypnotic effect of benzodiazepines?

• Positive allosteric modulation of GABA-A receptors increasing frequency of chloride channel opening
• Direct agonism at GABA-B receptors causing increased K+ conductance
• Blockade of NMDA receptors reducing excitatory glutamate transmission
• Inhibition of monoamine oxidase increasing CNS monoamines

Correct Answer: Positive allosteric modulation of GABA-A receptors increasing frequency of chloride channel opening

Q2. Which benzodiazepine is preferred in patients with hepatic impairment because it is primarily metabolized by glucuronidation rather than CYP450?

• Alprazolam
• Diazepam
• Lorazepam
• Triazolam

Correct Answer: Lorazepam

Q3. Flumazenil is used to reverse benzodiazepine effects; what important clinical risk must be considered when administering it to chronic benzodiazepine users?

• Precipitation of acute withdrawal seizures
• Development of prolonged respiratory depression
• Irreversible binding causing permanent benzodiazepine insensitivity
• Severe hepatotoxicity within hours

Correct Answer: Precipitation of acute withdrawal seizures

Q4. Buspirone’s anxiolytic efficacy in generalized anxiety disorder is mainly due to which pharmacologic action?

• Partial agonism at 5-HT1A receptors with minimal GABAergic activity
• Potent benzodiazepine-like positive modulation of GABA-A
• Selective inhibition of norepinephrine reuptake
• Antagonism of H1 histamine receptors causing sedation

Correct Answer: Partial agonism at 5-HT1A receptors with minimal GABAergic activity

Q5. Which antidepressant class is considered first-line pharmacotherapy for chronic generalized anxiety disorder and many panic disorders due to evidence of long-term benefit?

• Tricyclic antidepressants (TCAs)
• Selective serotonin reuptake inhibitors (SSRIs)
• Monoamine oxidase inhibitors (MAOIs)
• Benzodiazepines as monotherapy long-term

Correct Answer: Selective serotonin reuptake inhibitors (SSRIs)

Q6. Which property of zolpidem distinguishes it from classical benzodiazepines in terms of receptor selectivity?

• Selective binding to benzodiazepine site on GABA-A receptors containing the α1 subunit
• Preferential activation of GABA-B receptors rather than GABA-A
• Nonselective agonism of all GABA-A receptor subtypes
• Direct inhibition of orexin neuropeptide signaling

Correct Answer: Selective binding to benzodiazepine site on GABA-A receptors containing the α1 subunit

Q7. Which hypnotic is an orexin receptor antagonist used for insomnia and associated with fewer next‑day cognitive effects in some trials?

• Eszopiclone
• Suvorexant
• Ramelteon
• Flurazepam

Correct Answer: Suvorexant

Q8. Which statement about melatonin receptor agonists (e.g., ramelteon) is correct?

• They are GABA-A positive modulators with high abuse potential
• They act on MT1/MT2 receptors regulating circadian rhythm and have low dependence risk
• They are primarily CYP3A4 inhibitors and cause many drug interactions
• They are contraindicated in elderly due to high fall risk per Beers criteria

Correct Answer: They act on MT1/MT2 receptors regulating circadian rhythm and have low dependence risk

Q9. For performance-related situational anxiety, which drug class provides acute symptomatic relief by blocking peripheral manifestations like tachycardia and tremor?

• Beta‑adrenergic antagonists (e.g., propranolol)
• SSRIs (e.g., sertraline)
• Benzodiazepine receptor antagonists
• Monoamine oxidase inhibitors

Correct Answer: Beta‑adrenergic antagonists (e.g., propranolol)

Q10. Which adverse sleep-related behavior is a recognized safety concern with non‑benzodiazepine “Z‑drugs” such as zolpidem?

• Complex sleep-related behaviors including sleep-driving and sleep-eating
• Irreversible renal failure
• Immediate development of serotonin syndrome
• High risk of agranulocytosis within days

Correct Answer: Complex sleep-related behaviors including sleep-driving and sleep-eating

Q11. Which pharmacologic agent is supported by evidence and some guidelines as an alternative for generalized anxiety disorder when SSRIs/SNRIs are inadequate or not tolerated, acting via α2δ subunit of voltage-gated calcium channels?

• Prazosin
• Pilocarpine
• Pergolide
• Pregabalin

Correct Answer: Pregabalin

Q12. Which benzodiazepine is most likely to produce prolonged next‑day sedation because of active metabolites and long half-life?

• Triazolam
• Lorazepam
• Diazepam
• Zaleplon

Correct Answer: Diazepam

Q13. Which statement about SSRI initiation in anxiety disorders is clinically important to counsel patients about?

• Therapeutic anxiolytic effects often appear immediately within hours
• Initial worsening or activation of anxiety can occur during the first 1–2 weeks before benefit
• SSRIs universally cause severe sedation that limits daytime activities
• SSRIs have no sexual side effects and are preferred for this reason

Correct Answer: Initial worsening or activation of anxiety can occur during the first 1–2 weeks before benefit

Q14. In elderly patients with insomnia, which class is generally discouraged by Beers Criteria due to increased risk of cognitive impairment, falls and fractures?

• Benzodiazepines and non‑benzodiazepine Z‑drugs
• Melatonin receptor agonists
• Suvorexant (orexin antagonist)
• Trazodone at low doses

Correct Answer: Benzodiazepines and non‑benzodiazepine Z‑drugs

Q15. Which interaction is most clinically relevant when prescribing alprazolam concurrently with a strong CYP3A4 inhibitor like ketoconazole?

• Alprazolam clearance decreases leading to increased sedation and respiratory depression risk
• Alprazolam induces CYP3A4 causing loss of ketoconazole efficacy
• Ketoconazole reduces alprazolam absorption in the gut so dose needs increase
• There is no interaction because alprazolam is renally excreted unchanged

Correct Answer: Alprazolam clearance decreases leading to increased sedation and respiratory depression risk

Q16. Which antidepressant is commonly used off‑label for insomnia due to its sedating antihistaminic properties at low doses, but requires caution for anticholinergic effects?

• Trazodone
• Fluoxetine
• Bupropion
• Sertraline

Correct Answer: Trazodone

Q17. For benzodiazepine discontinuation in a patient using long-term therapy, what is a recommended clinical approach to minimize withdrawal and rebound anxiety?

• Abrupt cessation after one week of use
• Switch to a long‑acting benzodiazepine and gradual taper over weeks to months
• Immediate administration of flumazenil to prevent withdrawal
• Replace with high-dose antihistamines to avoid tapering

Correct Answer: Switch to a long‑acting benzodiazepine and gradual taper over weeks to months

Q18. Which pharmacologic agent is specifically indicated for nightmare disorder related to PTSD and acts as an alpha-1 adrenergic antagonist?

• Prazosin
• Propranolol
• Clonazepam
• Buspirone

Correct Answer: Prazosin

Q19. Which statement regarding suvorexant and lemborexant (dual orexin receptor antagonists) is true?

• They increase sleep by antagonizing orexin‑1 and orexin‑2 receptors and can cause daytime somnolence
• They are GABA-A agonists and have identical dependence profiles to benzodiazepines
• They are effective only for sleep onset but not for maintenance insomnia
• They are contraindicated in all patients with mild hepatic impairment

Correct Answer: They increase sleep by antagonizing orexin‑1 and orexin‑2 receptors and can cause daytime somnolence

Q20. Which antihistamine used as an over-the-counter hypnotic is associated with anticholinergic adverse effects and should be avoided in elderly patients with cognitive impairment?

• Diphenhydramine
• Melatonin
• Ramelteon
• Zaleplon

Correct Answer: Diphenhydramine

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