Drugs for Sleep Disorders — MCQs
A 32-year-old man comes to the physician complaining of excessive sleepiness for the past several months. He reports falling asleep while dealing with customers and had a near accident when he fell asleep while driving. The patient reports that he occasionally hears voices while falling asleep and finds himself "temporarily frozen" and unable to move upon awakening. Which of the following is the most appropriate treatment for this patient?
Berger waves (alpha waves) of EEG have a rhythm of how many Hz?
Which of the following statements about ramelteon is false?
Which of the antidepressants is used in low doses as a hypnotic?
Which sedative is most appropriate in a patient with hepatic impairment?
Shortest acting non benzodiazepine sedative is
Which of the following antidepressant drugs is used in the treatment of nocturnal enuresis?
Which of the following drugs used for obsessive-compulsive disorder has maximum anticholinergic effect?
All are used in attention deficit hyperactivity disorder (ADHD) except:
A 28-year-old woman with a history of seizures is prescribed a classic anticonvulsant that primarily works by inhibiting voltage-gated sodium channels. Which drug is most likely being prescribed?
Drugs for Sleep Disorders Indian Medical PG Practice Questions and MCQs
Question 1: A 32-year-old man comes to the physician complaining of excessive sleepiness for the past several months. He reports falling asleep while dealing with customers and had a near accident when he fell asleep while driving. The patient reports that he occasionally hears voices while falling asleep and finds himself "temporarily frozen" and unable to move upon awakening. Which of the following is the most appropriate treatment for this patient?
- A. Melatonin
- B. Modafinil (Correct Answer)
- C. Clonazepam
- D. Continuous positive airway pressure
Explanation: ***Modafinil*** - The patient's symptoms of **excessive daytime sleepiness** (EDS), **hypnagogic hallucinations** (hearing voices while falling asleep), and **sleep paralysis** are classic signs of **narcolepsy**. - **Modafinil** is a **non-amphetamine stimulant** that promotes wakefulness and is a first-line treatment for narcolepsy, improving alertness and reducing EDS. *Melatonin* - **Melatonin** is a hormone involved in regulating the **sleep-wake cycle** and is primarily used for **insomnia**, **jet lag**, or **circadian rhythm disorders**. - It is not effective for treating the hallmark symptoms of narcolepsy, such as cataplexy or excessive daytime sleepiness. *Clonazepam* - **Clonazepam** is a **benzodiazepine** that acts as a central nervous system depressant, primarily used for **anxiety disorders**, seizures, and some sleep disorders like **REM sleep behavior disorder**. - While it can help with some parasomnias, it would worsen daytime sleepiness in a patient with narcolepsy and is not a primary treatment for its core symptoms. *Continuous positive airway pressure* - **Continuous positive airway pressure (CPAP)** is the standard treatment for **obstructive sleep apnea (OSA)**, a condition characterized by recurrent upper airway collapse during sleep. - Although OSA can cause excessive daytime sleepiness, the patient's additional symptoms of hypnagogic hallucinations and sleep paralysis are not typical of OSA, making narcolepsy and its specific treatments more appropriate.
Question 2: Berger waves (alpha waves) of EEG have a rhythm of how many Hz?
- A. 0-4 Hz
- B. 4-7 Hz
- C. 8-13 Hz (Correct Answer)
- D. 13-30 Hz
Explanation: ***8-13 Hz*** - **Berger waves**, also known as **alpha waves**, are defined by their frequency range of **8 to 13 Hz** in the electroencephalogram (EEG). - These waves are typically observed when a person is in a relaxed, awake state with their eyes closed. *0-4 Hz* - This frequency range corresponds to **delta waves**, which are characteristic of deep sleep and certain brain pathologies. - Delta waves are much slower and have higher amplitude compared to alpha waves. *4-7 Hz* - This frequency range is associated with **theta waves**, commonly seen during light sleep, drowsiness, and some meditative states. - Theta waves are slower than alpha waves and indicate a state of reduced alertness. *13-30 Hz* - This frequency range represents **beta waves**, which are associated with active thinking, problem-solving, and alertness with open eyes. - Beta waves are faster and typically have lower amplitude than alpha waves.
Question 3: Which of the following statements about ramelteon is false?
- A. Is a substrate of CYP1A2
- B. Approved for treatment of insomnia
- C. Has high addiction liability (Correct Answer)
- D. Agonist at MT1 and MT2 receptors
Explanation: ***Has high addiction liability*** - Ramelteon is a **melatonin receptor agonist** that does not bind to GABA receptors, distinguishing it from benzodiazepines and Z-drugs (zolpidem, eszopiclone, zaleplon). - Its mechanism of action leads to a **very low risk of abuse and dependence**, contrary to the statement. *Is a substrate of CYP1A2* - Ramelteon is extensively metabolized in the liver, primarily by **CYP1A2**, which is accurate. - This metabolic pathway can lead to drug interactions if co-administered with **CYP1A2 inhibitors** (e.g., fluvoxamine), which can significantly increase ramelteon concentrations. *Approved for treatment of insomnia* - Ramelteon is indeed indicated for the **treatment of insomnia**, particularly for difficulties with **sleep onset**. - It works by mimicking the action of **melatonin**, promoting the regulation of the sleep-wake cycle. *Agonist at MT1 and MT2 receptors* - Ramelteon acts as a **selective agonist** at the **melatonin MT1 and MT2 receptors** in the suprachiasmatic nucleus. - Activation of these receptors helps to modulate the **circadian rhythm**, thereby promoting sleep.
Question 4: Which of the antidepressants is used in low doses as a hypnotic?
- A. fluoxetine
- B. fluvoxamine
- C. bupropion
- D. trazodone (Correct Answer)
Explanation: ***trazodone*** - **Trazodone** is an antidepressant that is frequently prescribed off-label at low doses as a **hypnotic** due to its potent **histamine H1 receptor antagonism** and **alpha-1 adrenergic blocking effects**, inducing sedation. - Its sedative properties differentiate it from other antidepressants that are primarily stimulating. *fluoxetine* - **Fluoxetine** is a **selective serotonin reuptake inhibitor (SSRI)** known for its **activating** effects, making it a poor choice for a hypnotic. - It is more likely to cause **insomnia** and agitation rather than sedation. *fluvoxamine* - **Fluvoxamine** is another **SSRI** primarily used for **obsessive-compulsive disorder (OCD)**. - Like other SSRIs, its primary action is not sedation, and it can sometimes lead to **sleep disturbances**. *bupropion* - **Bupropion** is a **norepinephrine-dopamine reuptake inhibitor (NDRI)** known for its **stimulating effects** and lack of sexual side effects. - It is often avoided in patients with **insomnia** due to its activating properties and is not used as a hypnotic.
Question 5: Which sedative is most appropriate in a patient with hepatic impairment?
- A. Midazolam
- B. Lorazepam (Correct Answer)
- C. Zolpidem
- D. Diazepam
Explanation: ***Lorazepam*** - **Lorazepam** is primarily metabolized by **glucuronidation**, a phase II metabolic pathway that is relatively preserved in most forms of hepatic impairment - This makes it a safer choice in patients with **liver disease** compared to other benzodiazepines that rely heavily on oxidative metabolism - Preferred sedative in cirrhosis and acute liver failure *Midazolam* - **Midazolam** is primarily metabolized by the **cytochrome P450 3A4 (CYP3A4)** enzyme system in the liver - Hepatic impairment can significantly reduce **CYP3A4 activity**, leading to prolonged half-life, increased sedative effects, and accumulation of the drug - Should be avoided or dose-reduced in hepatic impairment *Zolpidem* - **Zolpidem** is extensively metabolized by **hepatic cytochrome P450 enzymes**, particularly CYP3A4 and CYP2C9 - In patients with **hepatic impairment**, its clearance is significantly reduced, necessitating dose reduction to avoid excessive sedation and adverse effects - Maximum dose should be limited to 5 mg in hepatic dysfunction *Diazepam* - **Diazepam** undergoes extensive **hepatic oxidative metabolism** via CYP2C19 and CYP3A4 to active metabolites such as **desmethyldiazepam**, which also have long half-lives - In patients with **liver disease**, this metabolism is impaired, leading to prolonged drug action, increased sedation, and accumulation of the parent drug and active metabolites - Active metabolites can accumulate for days to weeks in hepatic impairment
Question 6: Shortest acting non benzodiazepine sedative is
- A. Zaleplon (Correct Answer)
- B. Eszopiclone
- C. Zopiclone
- D. Zolpidem
Explanation: ***Zaleplon*** - Has the shortest **half-life** (approximately 1 hour) among the non-benzodiazepine hypnotics, allowing for rapid elimination. - This quick elimination makes it ideal for patients who have difficulty **falling asleep** but do not need prolonged sedation. - Particularly useful for **middle-of-the-night** dosing due to its ultra-short duration. *Eszopiclone* - Has a half-life of about 6 hours, which is significantly longer than Zaleplon. - It's the S-enantiomer of zopiclone and is used for both **sleep onset and maintenance**. - Provides more sustained sleep throughout the night compared to Zaleplon. *Zopiclone* - Has a half-life of about 5-6 hours, which is considerably longer than Zaleplon. - It's used for the short-term treatment of **insomnia** and helps both with sleep onset and maintenance. - May cause a characteristic **bitter metallic taste** as a side effect. *Zolpidem* - Has a half-life of 2-3 hours, making it longer-acting than Zaleplon. - It's commonly prescribed for problems with **sleep initiation** and occasionally for sleep maintenance. - Available in extended-release formulations for prolonged action.
Question 7: Which of the following antidepressant drugs is used in the treatment of nocturnal enuresis?
- A. Imipramine (Correct Answer)
- B. Fluoxetine
- C. Trazodone
- D. Sertraline
Explanation: ***Imipramine*** - **Imipramine**, a **tricyclic antidepressant (TCA)**, is effective in treating nocturnal enuresis, particularly in children. - Its mechanism of action in this context is thought to involve anticholinergic effects, leading to **increased bladder capacity**, and alpha-adrenergic effects, causing **contraction of the internal urethral sphincter**. *Fluoxetine* - **Fluoxetine** is a **selective serotonin reuptake inhibitor (SSRI)** primarily used to treat depression, anxiety disorders, and obsessive-compulsive disorder. - It does not have a primary indication or established efficacy for the treatment of nocturnal enuresis. *Trazodone* - **Trazodone** is an **antidepressant** with sedative properties, often used for insomnia and depression. - While it modulates serotonin, it is not a first-line or established treatment for nocturnal enuresis. *Sertraline* - **Sertraline** is another **selective serotonin reuptake inhibitor (SSRI)** commonly prescribed for depression, anxiety, and panic disorder. - Like other SSRIs, it is not indicated for and has no significant role in the management of nocturnal enuresis.
Question 8: Which of the following drugs used for obsessive-compulsive disorder has maximum anticholinergic effect?
- A. Fluvoxamine
- B. Buspirone
- C. Sertraline
- D. Clomipramine (Correct Answer)
Explanation: ***Clomipramine*** - **Clomipramine** is a **tricyclic antidepressant (TCA)** with potent efficacy in OCD treatment. - It has **strong anticholinergic effects** including dry mouth, blurred vision, constipation, urinary retention, and cognitive impairment. - Among all medications used for OCD, clomipramine has the **maximum anticholinergic burden** due to its action on muscarinic receptors. - While effective for OCD, its significant side effect profile often limits its use to refractory cases. *Fluvoxamine* - **Fluvoxamine** is a **selective serotonin reuptake inhibitor (SSRI)** with FDA approval for OCD. - SSRIs have **minimal anticholinergic effects** compared to TCAs. - It selectively targets serotonin reuptake with little affinity for muscarinic cholinergic receptors. *Buspirone* - **Buspirone** is a **5-HT1A partial agonist** used primarily for **generalized anxiety disorder**. - It is **not a standard or approved treatment for OCD** - this makes it an inappropriate choice regardless of side effect profile. - It has negligible anticholinergic effects but lacks efficacy in OCD. *Sertraline* - **Sertraline** is an **SSRI** with FDA approval for OCD treatment. - Like other SSRIs, it has **very low affinity for muscarinic receptors** and minimal anticholinergic effects. - It is a first-line agent for OCD with a favorable side effect profile.
Question 9: All are used in attention deficit hyperactivity disorder (ADHD) except:
- A. Dextro-amphetamine
- B. Methylphenidate
- C. Phenobarbitone (Correct Answer)
- D. Atomoxetine
Explanation: ***Phenobarbitone*** - **Phenobarbitone** (phenobarbital) is a **barbiturate** primarily used as an **anticonvulsant** and for sedation. - It works as a **CNS depressant** and would worsen, not improve, symptoms of ADHD, which include inattention, hyperactivity, and impulsivity. - **Not indicated** for ADHD management and may cause sedation, cognitive impairment, and paradoxical hyperactivity in children. *Dextro-amphetamine* - **Dextro-amphetamine** is a **stimulant medication** commonly used in ADHD. - It works by increasing levels of **dopamine** and **norepinephrine** in the brain, improving focus and reducing hyperactivity. - Approved for ADHD treatment in both children and adults. *Methylphenidate* - **Methylphenidate** is a **stimulant** widely prescribed for ADHD and considered a first-line treatment. - It acts as a **norepinephrine-dopamine reuptake inhibitor**, thereby increasing the availability of these neurotransmitters. - Available in immediate-release and extended-release formulations. *Atomoxetine* - **Atomoxetine** is a **non-stimulant** selective norepinephrine reuptake inhibitor (SNRI) used for ADHD. - It is particularly useful in patients who cannot tolerate stimulants or have comorbid anxiety disorders. - Preferred when there is concern about substance abuse or tic disorders.
Question 10: A 28-year-old woman with a history of seizures is prescribed a classic anticonvulsant that primarily works by inhibiting voltage-gated sodium channels. Which drug is most likely being prescribed?
- A. Valproate
- B. Carbamazepine
- C. Lamotrigine
- D. Phenytoin (Correct Answer)
Explanation: ***Phenytoin*** - **Phenytoin** is the **classic prototype anticonvulsant** [1] that primarily works by **blocking voltage-gated sodium channels**, thus stabilizing the neuronal membrane and preventing repetitive firing [2]. - It is effective in treating various seizure types, including **focal** and **generalized tonic-clonic seizures** [1]. - As the traditional first-line agent in this class, it is the most likely answer when referring to a "classic" sodium channel blocker [1]. *Carbamazepine* - While **carbamazepine** also works by **blocking voltage-gated sodium channels** [2], it is structurally related to tricyclic antidepressants and came after phenytoin. - It's often used for **focal seizures** and **trigeminal neuralgia**. - Considered an important alternative but not the "classic" prototype [1]. *Valproate* - **Valproate** has **multiple mechanisms of action**, including inhibiting **GABA transaminase** (increasing GABA levels), blocking **sodium channels**, and modulating **T-type calcium channels** [2]. - Its broad spectrum is useful for both **focal** and **generalized seizures**, including absence seizures. - Not primarily classified as a sodium channel blocker due to its multiple mechanisms. *Lamotrigine* - **Lamotrigine** is a **newer anticonvulsant** [1] that inhibits presynaptic **voltage-gated sodium channels**, reducing the release of excitatory neurotransmitters like glutamate [2]. - It is effective against various seizure types, including **focal**, **generalized tonic-clonic**, and seizures associated with **Lennox-Gastaut syndrome**. - Developed later as a second-generation antiepileptic drug [1].
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