Ethnopsychopharmacology — MCQs
Pharmacodynamics deals with:-
A 60-year-old man with Alzheimer's disease has been started on donepezil. What is the primary mechanism of action of this medication?
Which of the following antipsychotics is a partial D2 agonist?
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?
Which of the following produces neuropsychiatric symptoms?
Fingernail hypoplasia is a complication of which of the following drugs?
Choose the correctly matched pairs regarding the drugs used in schizophrenia: 1. D2 antagonism: Reduces positive symptoms 2. 5HT2A antagonism: Reduces negative symptoms 3. 5HT1A agonism: Weight loss 4. Muscarinic antagonism: Reduces extrapyramidal symptoms
A patient presents with a persistent fear that his penis will retract into his abdomen, leading to the belief that this will result in his death. What is the diagnosis?
An 18-year-old boy presented with a belief that his penis is retracting into his abdomen and that he will die when it completely retracts. What is this disorder called?
Which of the following is not a culture-bound syndrome?
Ethnopsychopharmacology Indian Medical PG Practice Questions and MCQs
Question 1: Pharmacodynamics deals with:-
- A. Latency of onset
- B. Mechanism of action of a drug (Correct Answer)
- C. Transport of drug across the biological membranes
- D. Mode of excretion of a drug
Explanation: Detailed study of the **Mechanism of action of a drug** [1][2] - **Pharmacodynamics** describes what the **drug does to the body**, including its **molecular targets** and biochemical effects [3]. - This involves the study of the drug's mechanisms to produce its therapeutic or toxic effects [2]. *Latency of onset* - **Latency of onset** refers to the time it takes for a drug to start producing its effects, which is a pharmacokinetic rather than a pharmacodynamic parameter. - It deals with the drug's absorption and distribution rather than its interaction with the body once it reaches its site of action. *Transport of drug across the biological membranes* - The **transport of drugs across biological membranes** is a key aspect of **pharmacokinetics**, specifically absorption and distribution [1]. - This process determines how much drug reaches its target site, not how it interacts with the target. *Mode of excretion of a drug* - The **mode of excretion** of a drug (e.g., renal, hepatic) falls under **pharmacokinetics**, addressing how the body gets rid of the drug. - This process influences the drug's duration of action and elimination half-life, not its mechanism of action.
Question 2: A 60-year-old man with Alzheimer's disease has been started on donepezil. What is the primary mechanism of action of this medication?
- A. NMDA receptor antagonist
- B. Acetylcholinesterase inhibitor (Correct Answer)
- C. Dopamine receptor antagonist
- D. Serotonin reuptake inhibitor
Explanation: ***Acetylcholinesterase inhibitor*** - Donepezil **blocks the enzyme acetylcholinesterase**, which is responsible for breaking down acetylcholine [1], [2]. - By inhibiting this enzyme, donepezil **increases the levels of acetylcholine** in the brain, improving **cholinergic neurotransmission** in patients with Alzheimer's disease [2]. *NMDA receptor antagonist* - **NMDA receptor antagonists** like **memantine** work by blocking the activity of glutamate at the NMDA receptor, which is thought to reduce excitotoxicity in Alzheimer's [1], [3]. - This mechanism is different from donepezil, which targets the **cholinergic system** [1]. *Dopamine receptor antagonist* - **Dopamine receptor antagonists** are primarily used in conditions like **schizophrenia** or **Parkinson's disease** (for psychotic symptoms), by blocking dopamine receptors. - This is not the mechanism of action for medications used to treat cognitive symptoms of Alzheimer's disease. *Serotonin reuptake inhibitor* - **Serotonin reuptake inhibitors (SSRIs)** are a class of antidepressants that increase serotonin levels in the brain by blocking its reuptake [3]. - While depression can co-occur with Alzheimer's, SSRIs do not directly address the cognitive decline associated with the disease [3].
Question 3: Which of the following antipsychotics is a partial D2 agonist?
- A. Clozapine
- B. Quetiapine
- C. Ziprasidone
- D. Aripiprazole (Correct Answer)
Explanation: Aripiprazole - Aripiprazole is a D2 partial agonist [1][3], meaning it acts as an agonist in areas with low dopamine and an antagonist in areas with high dopamine [3]. - This unique mechanism helps to stabilize dopamine activity, leading to fewer extrapyramidal symptoms and hyperprolactinemia compared to typical antipsychotics. Clozapine - Clozapine is a D2 antagonist with a high affinity for D4 receptors and potent antagonism of 5-HT2A receptors; it is known for its efficacy in treatment-resistant schizophrenia [2]. - It carries a risk of severe side effects such as agranulocytosis [2] and myocarditis, requiring regular blood monitoring. Quetiapine - Quetiapine is primarily a D2 antagonist with significant antagonism at histamine H1 and alpha-1 adrenergic receptors, contributing to its sedative and orthostatic hypotensive effects. - It is known for its relatively low risk of extrapyramidal symptoms due to its rapid dissociation from D2 receptors. Ziprasidone - Ziprasidone is a D2 antagonist and a serotonin 5-HT1A agonist and 5-HT2C antagonist, contributing to its antidepressant and anti-anxiety effects. - It is associated with a risk of QTc prolongation, which necessitates cardiac monitoring in susceptible patients.
Question 4: 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?
- A. Sexual dysfunction and sleep disturbances (Correct Answer)
- B. Sexual dysfunction and nausea
- C. Headache and diarrhea
- D. Tremor and weight gain
Explanation: ***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.
Question 5: Which of the following produces neuropsychiatric symptoms?
- A. Cephalosporin
- B. Ethambutol
- C. Cyclosporine
- D. Cycloserine (Correct Answer)
Explanation: ***Cycloserine*** - **Cycloserine** is an antimicrobial agent that can cause a wide array of neuropsychiatric symptoms, including **headache**, **anxiety**, **depression**, **psychosis**, **seizures**, and **peripheral neuropathy**. - Its mechanism of action involves interfering with cell wall synthesis, but it also crosses the **blood-brain barrier**, leading to central nervous system effects. *Cephalosporin* - While some **cephalosporins** (especially at high doses or in patients with renal impairment) can cause CNS effects like **seizures**, they are not typically associated with a broad range of neuropsychiatric symptoms to the same extent as cycloserine. - The primary side effects of cephalosporins are usually **gastrointestinal disturbances** and **allergic reactions**. *Ethambutol* - **Ethambutol** is known for its ocular toxicity, specifically **optic neuritis**, which can lead to reduced visual acuity and **color blindness**. - It does not typically cause the generalized neuropsychiatric symptoms seen with cycloserine. *Cyclosporine* - **Cyclosporine**, an immunosuppressant, can cause neurological side effects such as **tremor**, **headache**, and **seizures**, and rarely **posterior reversible encephalopathy syndrome (PRES)**. - However, it is not primarily associated with the broad spectrum of psychiatric symptoms like depression or psychosis, unlike cycloserine.
Question 6: Fingernail hypoplasia is a complication of which of the following drugs?
- A. risperidone
- B. lithium
- C. olanzapine
- D. carbamazepine (Correct Answer)
Explanation: ***Carbamazepine*** - **Fingernail hypoplasia** (underdevelopment of nails) is a known teratogenic effect associated with first-trimester exposure to **carbamazepine**, part of the **fetal anticonvulsant syndrome**. - Other features of this syndrome include characteristic facial dysmorphism, microcephaly, developmental delay, and skeletal abnormalities. *Risperidone* - Risperidone is an **atypical antipsychotic** and its primary teratogenic risks are related to neonatal adaptation syndrome, such as withdrawal symptoms, rather than structural defects like fingernail hypoplasia. - While all antipsychotics should be used with caution during pregnancy, specific associations with structural malformations are less common and less severe than with some antiepileptic drugs. *Lithium* - Lithium is associated with a specific cardiac malformation, **Ebstein's anomaly**, when taken during the first trimester of pregnancy. - It is not typically linked to limb or nail hypoplasia. *Olanzapine* - Olanzapine is another **atypical antipsychotic** whose use in pregnancy is primarily linked to risks like **gestational diabetes** and **neonatal withdrawal symptoms**. - There is no strong evidence linking olanzapine to structural malformations like fingernail hypoplasia.
Question 7: Choose the correctly matched pairs regarding the drugs used in schizophrenia: 1. D2 antagonism: Reduces positive symptoms 2. 5HT2A antagonism: Reduces negative symptoms 3. 5HT1A agonism: Weight loss 4. Muscarinic antagonism: Reduces extrapyramidal symptoms
- A. 1,4
- B. 1,2,4
- C. 1,2,3,4
- D. 1,2 (Correct Answer)
Explanation: ***1,2*** - **D2 antagonism** is the primary mechanism by which antipsychotics reduce **positive symptoms** of schizophrenia, such as hallucinations and delusions. - **5HT2A antagonism** is a key mechanism of atypical antipsychotics contributing to the reduction of **negative symptoms** (e.g., apathy, anhedonia, flat affect) and cognitive deficits, while also reducing the risk of extrapyramidal symptoms. *1,2,3,4* - This option is incorrect because **5HT1A agonism** is not associated with **weight loss**. While 5HT1A partial agonism (as seen with aripiprazole and brexpiprazole) may improve negative symptoms, anxiety, and cognitive function, it does not directly cause weight loss. - Additionally, **muscarinic antagonism** does not reduce extrapyramidal symptoms as a primary mechanism. Rather, anticholinergic (muscarinic antagonist) drugs like benztropine are used to **treat** EPS after it occurs. The reduction of EPS in atypical antipsychotics primarily comes from 5HT2A antagonism and lower D2 binding affinity. *1,2,4* - This option is incorrect because **muscarinic antagonism** is not a mechanism that reduces EPS. Anticholinergic agents are used therapeutically to counteract EPS caused by dopamine blockade, but anticholinergic effects themselves do not prevent or reduce EPS. - The reduction of EPS with atypical antipsychotics is mainly due to **5HT2A antagonism** balancing dopaminergic blockade, selective limbic over striatal binding, and fast D2 dissociation kinetics. *1,4* - This option is incorrect because it omits **5HT2A antagonism**, which is crucial for reducing **negative symptoms** in schizophrenia. - It also incorrectly includes muscarinic antagonism as a mechanism that reduces EPS, when in reality anticholinergics are used to treat EPS rather than prevent it.
Question 8: A patient presents with a persistent fear that his penis will retract into his abdomen, leading to the belief that this will result in his death. What is the diagnosis?
- A. Koro (Correct Answer)
- B. Latah
- C. Dhat syndrome
- D. Cotard syndrome
Explanation: **Explanation:** The clinical presentation describes **Koro**, a culture-bound syndrome most commonly reported in South and East Asia (e.g., China, Malaysia, Indonesia). It is characterized by an episode of intense anxiety and the delusional belief that the penis (in men) or breasts/vulva (in women) are shrinking or retracting into the body, which the patient believes will ultimately lead to death. **Analysis of Options:** * **Koro (Correct):** A culture-specific anxiety neurosis involving genital retraction fears. It is often managed with reassurance and psychotherapy. * **Latah:** A culture-bound syndrome seen in Southeast Asia characterized by an exaggerated startle response, often accompanied by echolalia (repeating words), echopraxia (mimicking actions), or coprolalia (involuntary swearing). * **Dhat Syndrome:** Common in the Indian subcontinent, it involves excessive concern or clinical distress over the "loss of semen" (via urine or nocturnal emissions), which the patient believes leads to physical and mental weakness. * **Cotard Syndrome:** Also known as "Walking Corpse Syndrome," it is a nihilistic delusion where the patient believes they are dead, do not exist, or that their internal organs have rotted away. **High-Yield Clinical Pearls for NEET-PG:** * **Amok (Malaysia):** A sudden outburst of violent, wild, or homicidal behavior followed by exhaustion and amnesia. * **Piblokto (Arctic):** "Arctic hysteria" involving a sudden dissociative episode where the individual may strip naked and run into the snow. * **Taijin Kyofusho (Japan):** An intense fear that one’s body parts or functions (e.g., body odor, facial expression) are offensive or embarrassing to others.
Question 9: An 18-year-old boy presented with a belief that his penis is retracting into his abdomen and that he will die when it completely retracts. What is this disorder called?
- A. Dhaat syndrome
- B. Koro (Correct Answer)
- C. Latah
- D. Munchausen syndrome
Explanation: ### Explanation **Correct Option: B. Koro** Koro is a **culture-bound syndrome** primarily reported in Southeast Asia (e.g., Malaysia, Indonesia, Southern China). It is characterized by an episode of sudden and intense anxiety that the penis (in males) or the vulva/nipples (in females) are shrinking or retracting into the body, with the catastrophic belief that death will occur once the organ fully disappears. It is often managed with reassurance and psychotherapy. **Analysis of Incorrect Options:** * **A. Dhaat syndrome:** Common in the Indian subcontinent, this involves excessive concern or anxiety over the loss of "semen" (Dhaat) in urine, through masturbation, or nocturnal emissions. It is associated with symptoms of fatigue, weakness, and erectile dysfunction. * **C. Latah:** Found in Southeast Asia, this is a "startle reaction" syndrome. Following a sudden fright, the individual exhibits echolalia (repeating words), echopraxia (repeating actions), or command obedience. * **D. Munchausen syndrome:** A severe form of **Factitious Disorder** where a patient intentionally produces or feigns physical or psychological symptoms to assume the "sick role," without any external incentives (like financial gain). **High-Yield Clinical Pearls for NEET-PG:** * **Koro** is also known as *Shook Yang* in China. * **Amok (Malaysia):** A dissociative episode characterized by a period of brooding followed by a violent, aggressive, or homicidal outburst. * **Pibloktoq (Arctic Hysteria):** An abrupt dissociative episode in Inuit communities involving extreme excitement, stripping naked, and performing dangerous acts, followed by seizures and coma. * **Windigo (Algonquin Indians):** The morbid fear of being transformed into a cannibalistic monster.
Question 10: Which of the following is not a culture-bound syndrome?
- A. Amok
- B. Latah
- C. Dhat
- D. Von-Gogh (Correct Answer)
Explanation: **Explanation:** **1. Why "Von-Gogh" is the correct answer:** The **Van Gogh Syndrome** (or self-mutilation) is not a culture-bound syndrome. It refers to a clinical condition where an individual inflicts self-injury, typically associated with severe psychiatric disorders like Schizophrenia or Borderline Personality Disorder. It is named after the painter Vincent van Gogh, who famously cut off his own ear. Unlike culture-bound syndromes, this behavior is not restricted to a specific geographic or cultural group and is recognized as a symptom of underlying psychopathology worldwide. **2. Analysis of Incorrect Options:** * **Amok (Malaysia/South East Asia):** A dissociative episode characterized by a period of brooding followed by an outburst of violent, aggressive, or homicidal behavior directed at people and objects. * **Latah (Malaysia/Indonesia):** Seen primarily in middle-aged women, it involves an exaggerated startle response, echolalia (repeating words), echopraxia (mimicking actions), and command obedience. * **Dhat (Indian Subcontinent):** A common condition in India where patients suffer from severe anxiety and hypochondriacal concerns associated with the discharge of semen (in urine or nocturnal emission), believing it leads to physical and mental depletion. **High-Yield Clinical Pearls for NEET-PG:** * **Koro (South East Asia):** Anxiety that the penis (or breasts/vulva) is shrinking and retracting into the abdomen, potentially causing death. * **Pibloktoq (Arctic):** "Arctic Hysteria" involving extreme excitement followed by seizures or coma. * **Windigo (Algonquin Indians):** Delusion of being transformed into a cannibalistic monster. * **Culture-bound syndromes** are classified in the **ICD-10 (Annex 2)** and **DSM-IV**, though DSM-5 now uses the term "Cultural Concepts of Distress."
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