Drugs in Psychiatric Disorders Practice Questions

Q: Lithium directly affects which ion ?

Sodium. ***Sodium*** - Lithium directly interferes with **sodium ion transport** across cell membranes, particularly by inhibiting the **Na+/K+-ATPase** pump. - This interference alters intracellular sodium concentrations and affects neural excitability, contributing to its **mood-stabilizing** effects. *Potassium* - While potassium transport is linked to the **Na+/K+-ATPase pump**, lithium primarily acts through its effect on **sodium transport**, rather than directly mimicking or significantly altering potassium. - Changes in potassium levels due to lithium are largely secondary to its primary impact on sodium. *Magnesium* - Lithium has a more direct impact on **sodium channels** and transporters, contrasting with its less direct or significant interaction with magnesium metabolism. - Though magnesium is crucial for numerous cellular processes, it is not the primary ion directly affected by lithium's therapeutic actions. *Calcium* - Lithium does not directly affect **calcium channels** or calcium signaling pathways in the same way it impacts sodium. - While lithium may indirectly influence calcium-dependent processes, its primary direct target for therapeutic effects is not calcium.

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 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: Extrapyramidal syndrome-like side effects are seen in which of the following medications?

Haloperidol. ***Haloperidol*** - **Haloperidol** is a **typical antipsychotic** known for its potent **dopamine D2 receptor blockade**. - This strong blockade in the **nigrostriatal pathway** often leads to **extrapyramidal symptoms (EPS)** such as dystonia, akathisia, and parkinsonism. *Clozapine* - **Clozapine** is an **atypical antipsychotic** that has a lower propensity for causing **extrapyramidal symptoms (EPS)** due to its weaker D2 receptor antagonism and potent serotonin 5-HT2A receptor blockade. - While it can cause other severe side effects, such as **agranulocytosis** and **myocarditis**, EPS are less common compared to typical antipsychotics. *Tetracycline* - **Tetracycline** is an **antibiotic** primarily used to treat bacterial infections. - Its mechanism of action involves inhibiting bacterial protein synthesis, and it is not associated with **neurological side effects** like **extrapyramidal symptoms**. *Ketoconazole* - **Ketoconazole** is an **antifungal medication** that works by inhibiting ergosterol synthesis in fungi. - It is known for potential **hepatotoxicity** and **endocrine dysfunction**, but not for causing **extrapyramidal symptoms**.

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 adverse drug reaction is commonly associated with Haloperidol?

Acute Dystonia. ***Acute Dystonia*** - **Haloperidol** is a **first-generation antipsychotic** that potently blocks **dopamine D2 receptors**, especially in the **nigrostriatal pathway**. - This blockade can lead to acute, involuntary muscle contractions, known as **acute dystonia**, which often manifests as **torticollis**, **oculogyric crisis**, or **laryngospasm**. *Weight Gain* - While **weight gain** can occur with some antipsychotics, it is more commonly associated with **second-generation antipsychotics** (e.g., olanzapine, clozapine) due to their effects on histamine and serotonin receptors. - Haloperidol's risk of significant weight gain is generally considered to be lower. *Sedation* - **Sedation** can be an adverse effect of haloperidol, but it is not considered the **most common** or distinguishing adverse reaction compared to extrapyramidal symptoms. - Sedation is often a general side effect seen with many psychotropic medications. *Nausea* - **Nausea** is a possible gastrointestinal side effect of many medications, including haloperidol, but it is not a hallmark adverse reaction. - It is far less specific and less commonly problematic than the **extrapyramidal symptoms (EPS)** associated with haloperidol.

Q: Which of the following drugs has the maximum chances of causing hyperprolactinemia?

Risperidone. ***Risperidone*** - **Risperidone** has a higher propensity to cause **hyperprolactinemia** compared to other atypical antipsychotics due to its strong **dopamine D2 receptor antagonism**, which disinhibits prolactin secretion [1]. - This side effect can lead to symptoms like **galactorrhea**, **amenorrhea**, **gynecomastia**, and **sexual dysfunction** [1]. *Clozapine* - **Clozapine** generally has a **low risk of hyperprolactinemia** because it has a relatively weak affinity for **dopamine D2 receptors** and also acts as a **serotonin 5-HT2A antagonist**, which can counteract prolactin elevation [1]. - While other severe side effects like **agranulocytosis** are associated with clozapine, hyperprolactinemia is not a prominent concern. *Olanzapine* - **Olanzapine** has a moderate potential for elevating **prolactin levels**, often less than risperidone but more than aripiprazole or quetiapine. - Its effects on prolactin are attributable to its **dopamine D2 receptor antagonism**, but other pharmacological properties can modulate this effect. *Ziprasidone* - **Ziprasidone** is known for its **low risk of hyperprolactinemia**, similar to aripiprazole [1]. - This is partly due to its **less potent D2 receptor antagonism** and its additional actions as a serotonin 5-HT1A agonist, which can actually decrease prolactin release.

Q: Which medication is known to cause ptosis (eyelid drooping) as a side effect?

Amitriptyline. ***Amitriptyline*** - Amitriptyline is a **tricyclic antidepressant** that can cause anticholinergic side effects, including the **relaxation of Müller's muscle in the eyelid**, leading to **ptosis**. - This effect is due to its **alpha-adrenergic blocking properties**, which interfere with the sympathetic innervation of the eyelid muscles. *Phenylephrine* - Phenylephrine is an **alpha-1 adrenergic agonist**, meaning it would typically cause **pupil dilation (mydriasis)** and **eyelid elevation** by contracting Müller's muscle, not ptosis. - It is often used to treat nasal congestion and as an eye drop to **dilate pupils** or **reduce conjunctival redness**. *Epinephrine* - Epinephrine is a **potent adrenergic agonist** that stimulates both alpha and beta receptors. It would typically cause **eyelid retraction** and **pupil dilation** due to sympathetic activation, counteracting ptosis. - It is used in emergencies such as **anaphylaxis** and **cardiac arrest** due to its widespread systemic effects. *Levothyroxine* - Levothyroxine is a **synthetic thyroid hormone** used to treat hypothyroidism. Its side effects are generally related to hyperthyroidism if dosed improperly, such as **tachycardia**, **tremors**, and **heat intolerance**. - It does not directly affect the neuromuscular junction or sympathetic innervation of the eyelid in a way that would cause **ptosis**.

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).

Question 1

Lithium directly affects which ion ?

Accepted Answer

Sodium

Answer

Potassium

Answer

Magnesium

Answer

Calcium

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 a selective serotonin and norepinephrine reuptake inhibitor?

Accepted Answer

Venlafaxine

Answer

Fluoxetine

Answer

Sertraline

Answer

Aripiprazole

Question 4

Extrapyramidal syndrome-like side effects are seen in which of the following medications?

Accepted Answer

Haloperidol

Answer

Clozapine

Answer

Tetracycline

Answer

Ketoconazole

Question 5

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

Accepted Answer

Buspirone

Answer

Citalopram

Answer

Fluoxetine

Answer

Fluvoxamine

Question 6

Which adverse drug reaction is commonly associated with Haloperidol?

Accepted Answer

Acute Dystonia

Answer

Weight Gain

Answer

Sedation

Answer

Nausea

Question 7

Which of the following drugs has the maximum chances of causing hyperprolactinemia?

Accepted Answer

Risperidone

Answer

Clozapine

Answer

Olanzapine

Answer

Ziprasidone

Question 8

Which medication is known to cause ptosis (eyelid drooping) as a side effect?

Accepted Answer

Amitriptyline

Answer

Levothyroxine

Answer

Epinephrine

Answer

Phenylephrine

Question 9

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 10

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

Accepted Answer

Fluoxetine

Answer

Buspirone

Answer

Diazepam

Answer

Nitrazepam

Drugs in Psychiatric Disorders — MCQs

Drugs in Psychiatric Disorders — MCQs

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