LEHNE PHARM SEDATIVE HYPNOTIC DRUGS
QUESTIONS WITH VERIFIED CORRECT ANSWERS
WITH DETAILED RATIONALES.
1. Sedative-hypnotic drugs primarily produce their effects by enhancing which
neurotransmitter system?
A. Dopamine
B. Serotonin
C. GABA
D. Acetylcholine
C. GABA
Rationale: Most sedative-hypnotics (benzodiazepines, barbiturates, Z-drugs)
enhance GABAergic inhibition in the CNS, increasing chloride influx and
neuronal hyperpolarization.
2. Which drug is classified as a benzodiazepine?
A. Phenobarbital
B. Diazepam
C. Zolpidem
D. Buspirone
B. Diazepam
Rationale: Diazepam is a classic benzodiazepine used for anxiety, seizures,
and muscle relaxation.
3. The primary action of benzodiazepines is to:
A. Directly open chloride channels
B. Block GABA receptors
C. Increase frequency of GABA-A chloride channel opening
D. Inhibit dopamine release
C. Increase frequency of GABA-A chloride channel opening
Rationale: Benzodiazepines are positive allosteric modulators that increase
the frequency of GABA-A channel opening events.
,4. Barbiturates primarily act by:
A. Increasing duration of chloride channel opening
B. Blocking serotonin receptors
C. Increasing dopamine release
D. Blocking NMDA receptors only
A. Increasing duration of chloride channel opening
Rationale: Barbiturates prolong the duration of GABA-A chloride channel
opening, producing stronger CNS depression.
5. Which of the following is a ultra–short acting barbiturate used in anesthesia
induction?
A. Phenobarbital
B. Amobarbital
C. Thiopental
D. Secobarbital
C. Thiopental
Rationale: Thiopental is highly lipid-soluble, crosses the brain rapidly, and is
used for induction anesthesia.
6. Which effect is most characteristic of sedative-hypnotics at higher doses?
A. CNS stimulation
B. Anesthesia and respiratory depression
C. Increased reflexes
D. Increased dopamine release
B. Anesthesia and respiratory depression
Rationale: Dose-dependent CNS depression progresses from sedation →
hypnosis → anesthesia → respiratory depression.
7. Flumazenil is used as an antidote for:
A. Barbiturate overdose
B. Benzodiazepine overdose
C. Opioid overdose
D. Alcohol intoxication
B. Benzodiazepine overdose
, Rationale: Flumazenil is a competitive antagonist at the benzodiazepine
binding site on GABA-A receptors.
8. Which drug is a non-benzodiazepine hypnotic (“Z-drug”)?
A. Lorazepam
B. Zolpidem
C. Diazepam
D. Phenobarbital
B. Zolpidem
Rationale: Zolpidem selectively binds benzodiazepine receptor subtype (BZ1)
to induce sleep.
9. A common adverse effect of benzodiazepines is:
A. Severe hepatotoxicity
B. Respiratory stimulation
C. Sedation and drowsiness
D. Permanent memory loss in all patients
C. Sedation and drowsiness
Rationale: CNS depression causes drowsiness, impaired coordination, and
cognitive slowing.
10.Long-term use of sedative-hypnotics most commonly leads to:
A. No tolerance
B. Tolerance and dependence
C. Permanent immunity
D. Increased immunity to CNS depression
B. Tolerance and dependence
Rationale: Chronic use leads to receptor adaptation and withdrawal
symptoms on cessation.
11.Which benzodiazepine is commonly used for insomnia due to short
duration?
A. Diazepam
B. Triazolam
C. Clonazepam
QUESTIONS WITH VERIFIED CORRECT ANSWERS
WITH DETAILED RATIONALES.
1. Sedative-hypnotic drugs primarily produce their effects by enhancing which
neurotransmitter system?
A. Dopamine
B. Serotonin
C. GABA
D. Acetylcholine
C. GABA
Rationale: Most sedative-hypnotics (benzodiazepines, barbiturates, Z-drugs)
enhance GABAergic inhibition in the CNS, increasing chloride influx and
neuronal hyperpolarization.
2. Which drug is classified as a benzodiazepine?
A. Phenobarbital
B. Diazepam
C. Zolpidem
D. Buspirone
B. Diazepam
Rationale: Diazepam is a classic benzodiazepine used for anxiety, seizures,
and muscle relaxation.
3. The primary action of benzodiazepines is to:
A. Directly open chloride channels
B. Block GABA receptors
C. Increase frequency of GABA-A chloride channel opening
D. Inhibit dopamine release
C. Increase frequency of GABA-A chloride channel opening
Rationale: Benzodiazepines are positive allosteric modulators that increase
the frequency of GABA-A channel opening events.
,4. Barbiturates primarily act by:
A. Increasing duration of chloride channel opening
B. Blocking serotonin receptors
C. Increasing dopamine release
D. Blocking NMDA receptors only
A. Increasing duration of chloride channel opening
Rationale: Barbiturates prolong the duration of GABA-A chloride channel
opening, producing stronger CNS depression.
5. Which of the following is a ultra–short acting barbiturate used in anesthesia
induction?
A. Phenobarbital
B. Amobarbital
C. Thiopental
D. Secobarbital
C. Thiopental
Rationale: Thiopental is highly lipid-soluble, crosses the brain rapidly, and is
used for induction anesthesia.
6. Which effect is most characteristic of sedative-hypnotics at higher doses?
A. CNS stimulation
B. Anesthesia and respiratory depression
C. Increased reflexes
D. Increased dopamine release
B. Anesthesia and respiratory depression
Rationale: Dose-dependent CNS depression progresses from sedation →
hypnosis → anesthesia → respiratory depression.
7. Flumazenil is used as an antidote for:
A. Barbiturate overdose
B. Benzodiazepine overdose
C. Opioid overdose
D. Alcohol intoxication
B. Benzodiazepine overdose
, Rationale: Flumazenil is a competitive antagonist at the benzodiazepine
binding site on GABA-A receptors.
8. Which drug is a non-benzodiazepine hypnotic (“Z-drug”)?
A. Lorazepam
B. Zolpidem
C. Diazepam
D. Phenobarbital
B. Zolpidem
Rationale: Zolpidem selectively binds benzodiazepine receptor subtype (BZ1)
to induce sleep.
9. A common adverse effect of benzodiazepines is:
A. Severe hepatotoxicity
B. Respiratory stimulation
C. Sedation and drowsiness
D. Permanent memory loss in all patients
C. Sedation and drowsiness
Rationale: CNS depression causes drowsiness, impaired coordination, and
cognitive slowing.
10.Long-term use of sedative-hypnotics most commonly leads to:
A. No tolerance
B. Tolerance and dependence
C. Permanent immunity
D. Increased immunity to CNS depression
B. Tolerance and dependence
Rationale: Chronic use leads to receptor adaptation and withdrawal
symptoms on cessation.
11.Which benzodiazepine is commonly used for insomnia due to short
duration?
A. Diazepam
B. Triazolam
C. Clonazepam
