Drugs in Psychiatric Disorders Practice Questions

Q: Which of the following is a classic tricyclic antidepressant (TCA) commonly used as the prototype for the class?

Amitriptyline. ***Amitriptyline*** - **Amitriptyline** is a classic tricyclic antidepressant (TCA) and is widely recognized for its use in treating depression, neuropathic pain, and migraine prophylaxis. Its characteristic side effect profile, including **anticholinergic effects** and **sedation**, is well-known. - It is one of the **oldest and most frequently prescribed TCAs**, making it a common reference point in pharmacology and clinical practice. *Citalopram* - **Citalopram** is an **SSRI** (selective serotonin reuptake inhibitor), not a TCA. It works by selectively inhibiting the reuptake of serotonin. - It has a different side effect profile compared to TCAs, generally with fewer anticholinergic and cardiovascular effects. *Venlafaxine* - **Venlafaxine** is an **SNRI** (serotonin-norepinephrine reuptake inhibitor), not a TCA. It inhibits the reuptake of both serotonin and norepinephrine. - It has efficacy in treating depression and anxiety disorders, but its mechanism of action is distinct from TCAs. *Nortriptyline* - **Nortriptyline** is indeed a TCA, specifically a **secondary amine TCA**, which is an active metabolite of amitriptyline. - While it is a TCA, amitriptyline is generally more broadly recognized and used as the prototype for the class, with nortriptyline often being highlighted for its slightly better tolerability profile (e.g., less sedation, less orthostatic hypotension) compared to tertiary amine TCAs like amitriptyline.

Q: Which amino acid-derived neurotransmitter is primarily targeted in the pharmacological treatment of depression?

Serotonin. ***Serotonin*** - **Serotonin** is an amino acid-derived neurotransmitter (from **tryptophan**) known to play a crucial role in mood regulation, sleep, appetite, and other functions, making it a primary target for **antidepressant medications**. - Medications like **Selective Serotonin Reuptake Inhibitors (SSRIs)** increase serotonin levels in the brain to alleviate symptoms of depression. *Histamine* - **Histamine** is an amino acid-derived neurotransmitter (from **histidine**) primarily involved in allergic reactions, inflammation, and regulating wakefulness. - While it has some central nervous system effects, its primary role is not directly in the treatment of **depression**. *Acetylcholine* - **Acetylcholine** is a neurotransmitter involved in muscle contraction, learning, memory, and attention, and is not derived from amino acids; it is synthesized from **choline** and acetyl-CoA. - It is not directly used for treating **depression**, although imbalances can play a role in cognitive aspects of some psychiatric disorders. *None of the options* - This option is incorrect because **Serotonin** is indeed an amino acid-derived neurotransmitter (from tryptophan) targeted for treating **depression**. - Many antidepressant drugs work by modulating **serotonergic pathways**.

Q: Which of the following is not a selective serotonin reuptake inhibitor?

Buspirone. ***Buspirone*** - **Buspirone** is an anxiolytic that primarily acts as a **serotonin 5-HT1A receptor partial agonist**, not an SSRI. - It does not significantly affect the reuptake of serotonin, distinguishing it from SSRIs. *Fluoxetine* - **Fluoxetine** is a well-known and widely used **SSRI**. - It works by selectively inhibiting the reuptake of serotonin, thereby increasing its concentration in the synaptic cleft. *Fluvoxamine* - **Fluvoxamine** is another antidepressant classified as an **SSRI**. - It is often used for the treatment of **obsessive-compulsive disorder (OCD)** due to its strong serotonin reuptake inhibition. *Citalopram* - **Citalopram** is an **SSRI** frequently prescribed for depression and anxiety disorders. - Its mechanism involves potent and selective inhibition of **serotonin reuptake**.

Q: Which of the following is a selective serotonin and norepinephrine reuptake inhibitor?

Venlafaxine. ***Venlafaxine*** - **Venlafaxine** is a commonly used antidepressant that inhibits the reuptake of both **serotonin** and **norepinephrine**, making it an SNRI. - Its dual mechanism of action can be effective for a broad range of depressive and anxiety disorders. *Fluoxetine* - **Fluoxetine** is a **selective serotonin reuptake inhibitor (SSRI)**, primarily affecting serotonin levels in the brain. - It does not significantly inhibit norepinephrine reuptake and, thus, is not classified as an SNRI. *Sertraline* - **Sertraline** is another widely prescribed antidepressant that is also a **selective serotonin reuptake inhibitor (SSRI)**. - It works mainly by increasing serotonin availability in the synaptic cleft. *Aripiprazole* - **Aripiprazole** is an **atypical antipsychotic** medication, often used as an adjunct therapy for depression, but its primary mechanism is partial agonism at dopamine D2 and serotonin 5-HT1A receptors, and antagonism at serotonin 5-HT2A receptors. - It is not classified as a selective serotonin and norepinephrine reuptake inhibitor.

Q: An SSRI antidepressant, such as fluoxetine, will be prescribed for an adult patient. You should advise him or her that two of the most likely side effects or adverse responses that may eventually occur at therapeutic blood levels are which of the following?

Sexual dysfunction and sleep disturbances. ***Sexual dysfunction and sleep disturbances*** - **Sexual dysfunction** is one of the most common and persistent adverse effects of SSRIs, affecting 40-65% of patients and continuing throughout treatment at therapeutic levels [2], [3]. - **Sleep disturbances** (insomnia or altered sleep architecture) can persist during long-term SSRI therapy and are among the eventual side effects patients experience [1], [2], [3]. - Both effects are characteristic of chronic SSRI use and significantly impact patient compliance and quality of life. *Sexual dysfunction and nausea* - While **sexual dysfunction** is indeed very common and persistent, **nausea** is typically a transient side effect that occurs during the first 1-2 weeks of treatment and usually resolves with continued use [2]. - The question specifically asks about *eventual* occurrence at therapeutic levels over time, making nausea less appropriate as it is not a chronic issue. *Tremor and weight gain* - **Tremor** is not among the most common side effects of SSRIs and occurs less frequently than sexual dysfunction or sleep disturbances. - **Weight gain** can occur with some SSRIs (particularly paroxetine), but fluoxetine is actually considered weight-neutral or may even cause weight loss in some patients, making this combination less likely for fluoxetine specifically [1]. *Headache and diarrhea* - Both **headache** and **diarrhea** are common initial side effects when starting SSRIs but typically improve or resolve within the first few weeks of treatment [1]. - These are transient effects rather than eventual persistent side effects that characterize long-term therapeutic use.

Q: Which of the following is NOT a common effect of tricyclic antidepressants?

Metabolic alkalosis. ***Metabolic alkalosis*** - **Tricyclic antidepressants (TCAs)** do not typically cause metabolic alkalosis. Their overdose or therapeutic use is not associated with this acid-base imbalance. - While TCAs can disrupt various physiological processes, **metabolic alkalosis** is not a characteristic adverse effect or sign of overdose. *Prolongation of QRS complexes* - **TCAs block sodium channels** in the myocardium, which can lead to widening of the **QRS complex**, indicating delayed ventricular depolarization. - This is a significant cardiac toxicity of TCA overdose, increasing the risk of **ventricular arrhythmias**. *Myoclonic jerks* - **TCA overdose** can manifest with **neurological symptoms**, including involuntary muscle contractions like **myoclonic jerks**. - These are often part of the **seizure activity** that can occur with severe TCA toxicity. *Coma* - **Central nervous system depression** is a common and serious effect of TCA overdose, often leading to **coma**. - This is due to the broad **anticholinergic** and **sedative effects** of these drugs at high doses.

Q: Which of the following is not classified as a traditional anxiolytic?

Fluoxetine. ***Fluoxetine*** - **Fluoxetine** is a **selective serotonin reuptake inhibitor (SSRI)** primarily used as an antidepressant, not a traditional anxiolytic. - While SSRIs are now used to treat anxiety disorders, they are not classified as traditional anxiolytics, which historically refer to benzodiazepines and related compounds. - Traditional anxiolytics work primarily through GABAergic mechanisms, whereas fluoxetine works through serotonin reuptake inhibition. *Buspirone* - **Buspirone** is a non-benzodiazepine anxiolytic that acts as a partial agonist at 5-HT1A serotonin receptors. - It is specifically indicated and FDA-approved for the treatment of generalized anxiety disorder. - Though it has a different mechanism from benzodiazepines, it is classified as an anxiolytic agent. *Diazepam* - **Diazepam** is a **benzodiazepine** that enhances the effect of the neurotransmitter **GABA** at the **GABA-A receptor**, leading to sedative, hypnotic, anxiolytic, anticonvulsant, and muscle relaxant properties. - It is a classic and widely recognized traditional anxiolytic, representing the prototypical benzodiazepine anxiolytic. *Nitrazepam* - **Nitrazepam** is a **benzodiazepine**, primarily indicated as a **hypnotic** for the treatment of severe insomnia. - As a benzodiazepine, it belongs to the traditional anxiolytic drug class and possesses anxiolytic properties through GABAergic mechanisms. - Despite being primarily used as a hypnotic, it is still considered part of the traditional anxiolytic class (benzodiazepines).

Q: Which of the following antidepressant drugs is used in the treatment of nocturnal enuresis?

Imipramine. ***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.

Q: Which of the following is an atypical antipsychotic?

Clozapine. ***Clozapine*** - **Clozapine** is an **atypical antipsychotic** characterized by its efficacy in treating **refractory schizophrenia** and a lower risk of **extrapyramidal symptoms (EPS)** compared to typical antipsychotics. - Its mechanism involves antagonism of **dopamine D2** and **serotonin 5-HT2A** receptors, as well as several other receptor types. *Chlorpromazine* - **Chlorpromazine** is a **typical (first-generation) antipsychotic**, known for its strong **D2 blockade** and higher incidence of **extrapyramidal side effects**. - It was one of the first antipsychotics developed and is also used for its **antiemetic** properties. *Thiothixene* - **Thiothixene** is a **typical (first-generation) antipsychotic** that primarily acts by blocking **dopamine D2 receptors**. - It is associated with a higher risk of **extrapyramidal symptoms** and other side effects characteristic of typical antipsychotics. *Haloperidol* - **Haloperidol** is a **high-potency typical (first-generation) antipsychotic** with potent **D2 receptor antagonism**. - It is often used for acute psychosis and delirium but carries a significant risk of **extrapyramidal side effects** and **tardive dyskinesia**.

Q: Which drug is most commonly used worldwide in maintenance treatment for opioid dependence?

Methadone. ***Methadone (Correct Answer)***- It is a **long-acting opioid agonist** that helps reduce cravings and withdrawal symptoms associated with opioid dependence, making it highly effective for maintenance treatment [2].- Its widespread availability and established efficacy in reducing illicit opioid use, crime, and disease transmission contribute to its global prevalence [1].- Methadone acts on **μ-opioid receptors** [2] and has a long half-life (24-36 hours), allowing once-daily dosing in maintenance therapy.*Disulfiram (Incorrect)*- This drug is primarily used in the management of **alcohol dependence** by causing unpleasant reactions when alcohol is consumed (inhibits aldehyde dehydrogenase) [3].- It has no role in the treatment of opioid dependence, as its mechanism of action is unrelated to opioid receptors.*Naltrexone (Incorrect)*- While used for opioid dependence, **naltrexone** is an **opioid antagonist** that blocks the effects of opioids [4].- Its use requires complete detoxification from opioids before initiation to avoid precipitated withdrawal, which can be a barrier to its common use in maintenance compared to methadone [1].- Less commonly used globally compared to methadone for maintenance treatment.*Imipramine (Incorrect)*- **Imipramine** is a **tricyclic antidepressant** primarily used to treat depression and some anxiety disorders.- It does not have any direct pharmacological action on opioid receptors and is not used in the treatment of opioid dependence.

Question 1

Which of the following is a classic tricyclic antidepressant (TCA) commonly used as the prototype for the class?

Accepted Answer

Amitriptyline

Answer

Citalopram

Answer

Venlafaxine

Answer

Nortriptyline

Question 2

Which amino acid-derived neurotransmitter is primarily targeted in the pharmacological treatment of depression?

Accepted Answer

Serotonin

Answer

Histamine

Answer

None of the options

Answer

Acetylcholine

Question 3

Which of the following is not a selective serotonin reuptake inhibitor?

Accepted Answer

Buspirone

Answer

Citalopram

Answer

Fluoxetine

Answer

Fluvoxamine

Question 4

Which of the following is a selective serotonin and norepinephrine reuptake inhibitor?

Accepted Answer

Venlafaxine

Answer

Fluoxetine

Answer

Sertraline

Answer

Aripiprazole

Question 5

An SSRI antidepressant, such as fluoxetine, will be prescribed for an adult patient. You should advise him or her that two of the most likely side effects or adverse responses that may eventually occur at therapeutic blood levels are which of the following?

Accepted Answer

Sexual dysfunction and sleep disturbances

Answer

Sexual dysfunction and nausea

Answer

Headache and diarrhea

Answer

Tremor and weight gain

Question 6

Which of the following is NOT a common effect of tricyclic antidepressants?

Accepted Answer

Metabolic alkalosis

Answer

Prolongation of QRS complexes

Answer

Myoclonic jerks

Answer

Coma

Question 7

Which of the following is not classified as a traditional anxiolytic?

Accepted Answer

Fluoxetine

Answer

Buspirone

Answer

Diazepam

Answer

Nitrazepam

Question 8

Which of the following antidepressant drugs is used in the treatment of nocturnal enuresis?

Accepted Answer

Imipramine

Answer

Fluoxetine

Answer

Trazodone

Answer

Sertraline

Question 9

Which of the following is an atypical antipsychotic?

Accepted Answer

Clozapine

Answer

Chlorpromazine

Answer

Thiothixene

Answer

Haloperidol

Question 10

Which drug is most commonly used worldwide in maintenance treatment for opioid dependence?

Accepted Answer

Methadone

Answer

Disulfiram

Answer

Naltrexone

Answer

Imipramine

Drugs in Psychiatric Disorders — MCQs

Drugs in Psychiatric Disorders — MCQs

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