Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 281: Which of the following medications is used to prevent relapse in alcohol dependence?

A. Fluoxetine (Correct Answer)
B. Nalmefene
C. Acamprosate
D. Topiramate

Explanation: **Explanation:** In the context of alcohol dependence, the choice of medication depends on the patient's specific clinical profile. While several drugs are used to maintain abstinence, **Fluoxetine** (an SSRI) is specifically indicated for preventing relapse in patients with **comorbid Depression and Alcohol Use Disorder**. In NEET-PG scenarios, if a patient exhibits depressive symptoms alongside dependence, treating the underlying mood disorder with Fluoxetine significantly reduces the craving and the likelihood of relapse. **Analysis of Options:** * **Fluoxetine (Correct):** It is the drug of choice for alcohol dependence with comorbid depression. By stabilizing serotonin levels, it addresses the "dual diagnosis" aspect, thereby preventing relapse. * **Acamprosate:** This is a GABAergic agonist and NMDA antagonist. It is a first-line agent used to **maintain abstinence** (reduce the "craving to drink") in patients who have already stopped drinking. It is particularly useful in patients with liver disease as it is renally excreted. * **Nalmefene:** An opioid antagonist (similar to Naltrexone) used primarily to **reduce the amount of alcohol consumed** (targeted consumption) rather than total abstinence. * **Topiramate:** An anti-epileptic used off-label to reduce cravings and heavy drinking days, but it is generally considered a second-line agent. **High-Yield Clinical Pearls for NEET-PG:** * **Disulfiram:** Causes an unpleasant reaction (aldehyde dehydrogenase inhibition); requires high patient motivation. * **Naltrexone:** First-line for reducing the "reward" or "high" of drinking; contraindicated in acute hepatitis or liver failure. * **Acamprosate:** Safe in liver disease; contraindicated in renal failure (CrCl <30 ml/min). * **Wernicke’s Encephalopathy:** Always give Thiamine *before* Glucose to prevent precipitating acute neurological deterioration.

Question 282: Which of the following is relatively normal in Korsakoff's psychosis?

A. Implicit memory
B. Intelligence
C. Language
D. Learning (Correct Answer)

Explanation: ### Explanation **Korsakoff’s Psychosis** is a chronic neuropsychiatric syndrome resulting from severe Thiamine (Vitamin B1) deficiency, typically following Wernicke’s Encephalopathy. It is characterized by profound **anterograde amnesia** (inability to form new memories) and **confabulation**. #### Why "Learning" is the Correct Answer: In the context of NEET-PG questions based on standard textbooks (like Kaplan & Sadock), it is noted that while patients cannot form new **declarative (explicit) memories**, they retain the ability for **procedural learning**. They can learn new manual skills or tasks (e.g., solving a puzzle faster with repetition) even if they have no conscious memory of ever practicing them. Thus, certain types of learning remain relatively intact. #### Analysis of Incorrect Options: * **A. Implicit Memory:** While implicit memory (procedural) is often preserved, the question specifically highlights "Learning" as the broader functional category preserved in these patients. However, in many clinical contexts, implicit memory and learning are both relatively spared compared to explicit memory. * **B. Intelligence:** While IQ may appear normal on some scales, there is often a "frontal lobe" deficit and a decline in global cognitive functioning over time; therefore, it is not considered "relatively normal" in the same way procedural learning is. * **C. Language:** While basic speech is preserved, patients often show deficits in complex word finding or spontaneous narrative due to cognitive decay. #### High-Yield Clinical Pearls for NEET-PG: * **Anatomical Site:** Lesions are most commonly found in the **mammillary bodies** and the **dorsomedial nucleus of the thalamus**. * **The Hallmark:** Anterograde amnesia + Confabulation (filling memory gaps with fabricated stories). * **Treatment:** High-dose Thiamine. Note that while Wernicke’s is reversible, Korsakoff’s is often **irreversible** (only 20% recover fully). * **Rule of Thumb:** Always give Thiamine **before** Glucose in a suspected alcoholic to prevent precipitating Wernicke’s.

Question 283: All of the following are used in nicotine de-addiction, except?

A. Bupropion
B. Clonidine
C. Nicotine gum
D. Buspirone (Correct Answer)

Explanation: **Explanation:** The management of nicotine dependence involves both pharmacological and behavioral interventions. The correct answer is **Buspirone**, as it has no proven efficacy in smoking cessation. **1. Why Buspirone is the Correct Answer:** Buspirone is an **anxiolytic** (5-HT1A partial agonist) used primarily for Generalized Anxiety Disorder (GAD). While anxiety is a common withdrawal symptom of nicotine, clinical trials have shown that Buspirone does not improve long-term quit rates or reduce cravings compared to a placebo. **2. Why the other options are used:** * **Bupropion (Option A):** An atypical antidepressant (NDRI) that inhibits the reuptake of norepinephrine and dopamine. It mimics some of the effects of nicotine on the brain's reward system, reducing withdrawal symptoms and the urge to smoke. It is a **first-line** non-nicotine therapy. * **Clonidine (Option B):** An alpha-2 adrenergic agonist. It is considered a **second-line** agent. It helps suppress the sympathetic overactivity (agitation, irritability) associated with nicotine withdrawal. * **Nicotine Gum (Option C):** A form of **Nicotine Replacement Therapy (NRT)**. It provides a controlled dose of nicotine to the blood to alleviate withdrawal symptoms while the patient breaks the behavioral habit of smoking. **Clinical Pearls for NEET-PG:** * **First-line agents:** NRT (Gums, patches, lozenges), Bupropion, and **Varenicline** (a nicotinic ACh receptor partial agonist; most effective single agent). * **Second-line agents:** Clonidine and Nortriptyline. * **Contraindication:** Bupropion is strictly contraindicated in patients with a **seizure disorder** or eating disorders (bulimia/anorexia) as it lowers the seizure threshold. * **Varenicline side effect:** Most common is nausea; also monitor for neuropsychiatric symptoms (suicidal ideation).

Question 284: Disulfiram and acamprosate are used for which of the following conditions?

A. Alcohol abstinence (Correct Answer)
B. Cocaine abuse
C. Opium poisoning
D. Atropine overdose

Explanation: **Explanation:** The correct answer is **Alcohol abstinence**. Both Disulfiram and Acamprosate are FDA-approved pharmacological interventions used to maintain sobriety in patients with Alcohol Use Disorder (AUD). * **Disulfiram (Aversion Therapy):** It acts by inhibiting the enzyme **aldehyde dehydrogenase**. This leads to the accumulation of acetaldehyde if alcohol is consumed, causing the "Disulfiram-ethanol reaction" (flushing, tachycardia, nausea, and palpitations). This creates a psychological deterrent against drinking. * **Acamprosate (Anti-craving):** It is a GABA agonist and NMDA antagonist. It helps restore the neurochemical balance (homeostasis) in the brain that is disrupted by chronic alcohol use, thereby reducing withdrawal symptoms and cravings. **Analysis of Incorrect Options:** * **B. Cocaine abuse:** Treatment is primarily symptomatic (e.g., benzodiazepines for agitation). There is no FDA-approved maintenance medication, though Disulfiram is sometimes studied off-label. * **C. Opium poisoning:** The acute management requires **Naloxone** (opioid antagonist). Maintenance for dependence involves Methadone or Buprenorphine. * **D. Atropine overdose:** The specific antidote is **Physostigmine**, a reversible acetylcholinesterase inhibitor. **High-Yield Clinical Pearls for NEET-PG:** * **Naltrexone:** Another first-line drug for alcohol dependence; it reduces the "reward" or euphoria of drinking by blocking mu-opioid receptors. * **Acamprosate** is the drug of choice in patients with **liver disease**, as it is renally excreted. * **Naltrexone** is contraindicated in patients with acute hepatitis or liver failure. * **Wernicke’s Encephalopathy:** Always remember to give Thiamine *before* Glucose in alcoholic patients to prevent precipitating this condition.

Question 285: Which is NOT a method of behavioral treatment used for alcoholism?

A. Aversion therapy
B. Cue exposure
C. Home detoxification (Correct Answer)
D. Alcoholics Anonymous

Explanation: **Explanation:** The question asks to identify which option is **NOT** a behavioral treatment method. Behavioral treatments are psychological interventions based on learning theories (Classical and Operant Conditioning) aimed at modifying drinking behavior. **Why "Home Detoxification" is the correct answer:** Home detoxification is a **medical/pharmacological intervention**, not a behavioral therapy. It involves the supervised withdrawal from alcohol in a residential setting, primarily using medications like Benzodiazepines (e.g., Chlordiazepoxide) to prevent seizures and delirium tremens. It addresses the physiological dependence rather than the psychological behavior. **Analysis of Incorrect Options:** * **Aversion Therapy:** A classic behavioral technique based on **Classical Conditioning**. It involves pairing the sight/smell/taste of alcohol with an unpleasant stimulus (like Emetine to induce vomiting or electric shocks) to create a conditioned distaste for alcohol. * **Cue Exposure:** Based on **Extinction theory**. Patients are exposed to triggers (cues) like the smell of beer or a bar environment without being allowed to drink. This helps reduce the conditioned craving over time. * **Alcoholics Anonymous (AA):** While primarily a self-help/mutual-aid group, it utilizes **Social Learning** and behavioral modification through its 12-step program, peer reinforcement, and lifestyle restructuring. **High-Yield Clinical Pearls for NEET-PG:** * **Disulfiram (Antabuse):** Works via **Aversion** by inhibiting *Aldehyde Dehydrogenase*, leading to toxic accumulation of Acetaldehyde (Disulfiram-like reaction). * **Gold Standard for Alcohol Withdrawal:** Benzodiazepines (Diazepam/Chlordiazepoxide). * **Wernicke’s Encephalopathy:** Always give Thiamine *before* Glucose to prevent precipitating this condition. * **Naltrexone:** An Opioid antagonist used to reduce cravings and the "reward" of drinking.

Question 286: Magnan's symptom', 'crack lung', and 'crack dancing' are seen in chronic use of which of the following substances?

A. Alcohol
B. Cannabis
C. Cocaine (Correct Answer)
D. Barbiturates

Explanation: **Explanation:** The correct answer is **Cocaine**. These three terms represent specific clinical manifestations of chronic cocaine toxicity, particularly in its potent alkaloid form known as "crack." 1. **Magnan’s Symptom (Formication):** This is a tactile hallucination where the patient feels as if insects are crawling under their skin (also called "cocaine bugs"). It often leads to excessive scratching and skin excoriations. 2. **Crack Lung:** An acute pulmonary syndrome occurring after inhaling freebase cocaine. It is characterized by diffuse alveolar hemorrhage, eosinophilia, and infiltrates on chest X-ray, presenting with chest pain, dyspnea, and hemoptysis. 3. **Crack Dancing (Choreoathetosis):** A transient movement disorder characterized by choreiform (jerky, involuntary) movements of the limbs, caused by cocaine-induced dopamine dysregulation in the basal ganglia. **Why other options are incorrect:** * **Alcohol:** Chronic use leads to Wernicke-Korsakoff syndrome, DTs, or liver cirrhosis, but not these specific signs. * **Cannabis:** Associated with "Amotivational Syndrome," conjunctival injection, and increased appetite (munchies). * **Barbiturates:** These are CNS depressants; toxicity leads to respiratory depression, coma, and "bullous lesions" in severe overdose, not stimulant-related tactile hallucinations. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Cocaine blocks the reuptake of Dopamine, Norepinephrine, and Serotonin. * **Pupils:** Cocaine causes **Mydriasis** (dilated pupils), whereas Opioids cause Miosis (pinpoint pupils). * **Cardiovascular:** Cocaine is a potent vasoconstrictor; it is a leading cause of drug-induced Myocardial Infarction in young adults. * **Treatment:** Benzodiazepines are the first-line treatment for cocaine toxicity. **Beta-blockers are contraindicated** due to the risk of unopposed alpha-adrenergic stimulation.

Question 287: Which of the following drugs are effective pharmacologic interventions for the management of smoking cessation?

A. Bupropion
B. Varenicline
C. Clonidine
D. All of the above (Correct Answer)

Explanation: Smoking cessation management involves both behavioral therapy and pharmacotherapy. The pharmacological agents are categorized into first-line and second-line treatments, all of which aim to reduce withdrawal symptoms and cravings. **Explanation of Options:** * **Varenicline (First-line):** A **selective nicotine acetylcholine receptor ($\alpha_4\beta_2$) partial agonist**. It works by stimulating low-level dopamine release (reducing withdrawal) while simultaneously blocking nicotine from binding to the receptor (reducing the reward/reinforcement of smoking). It is currently considered the most effective monotherapy. * **Bupropion (First-line):** An atypical antidepressant that acts as a **Norepinephrine-Dopamine Reuptake Inhibitor (NDRI)**. It mimics the effect of nicotine on dopamine levels in the nucleus accumbens, thereby reducing the urge to smoke. It is particularly useful in smokers with comorbid depression. * **Clonidine (Second-line):** An **$\alpha_2$-adrenergic agonist**. While not first-line due to side effects like sedation and hypotension, it is effective in reducing the sympathetic overactivity associated with nicotine withdrawal. * **Nortriptyline:** Another second-line agent (TCA) used when first-line drugs fail. **High-Yield Clinical Pearls for NEET-PG:** * **Varenicline Side Effects:** Most common is **nausea**; most serious are neuropsychiatric symptoms (suicidal ideation) and vivid dreams. * **Bupropion Contraindication:** Strictly contraindicated in patients with **seizure disorders** or eating disorders (bulimia/anorexia) as it lowers the seizure threshold. * **Nicotine Replacement Therapy (NRT):** Includes gums, patches, lozenges, and inhalers. Combining NRT (patch + gum) is often more effective than a single form. * **Weight Gain:** Bupropion is the preferred choice for patients concerned about post-cessation weight gain.

Question 288: Alcohol withdrawal presents with all of the following EXCEPT:

A. Hallucinations
B. Tremors
C. Bradycardia (Correct Answer)
D. Sweating

Explanation: ### Explanation Alcohol is a Central Nervous System (CNS) depressant that enhances GABAergic (inhibitory) tone and inhibits NMDA (excitatory) glutamate receptors. Chronic consumption leads to a compensatory down-regulation of GABA receptors and up-regulation of NMDA receptors to maintain homeostasis. When alcohol is abruptly stopped, this balance shifts toward **CNS hyperexcitability** and **autonomic hyperactivity**. **Why Bradycardia is the Correct Answer:** Alcohol withdrawal is characterized by a "hyper-adrenergic" state. This leads to **Tachycardia** (increased heart rate) and hypertension, rather than Bradycardia (slow heart rate). Bradycardia is typically seen in opioid overdose or sedative-hypnotic intoxication, not alcohol withdrawal. **Analysis of Other Options:** * **Tremors (Option B):** The most common and earliest sign of withdrawal ("the shakes"), usually appearing within 6–12 hours of the last drink. * **Sweating (Option D):** Diaphoresis is a hallmark of autonomic instability caused by sympathetic overactivity. * **Hallucinations (Option A):** Alcoholic hallucinosis (usually visual or tactile) can occur 12–24 hours after cessation. Unlike Delirium Tremens, these occur in a state of clear sensorium. **High-Yield Clinical Pearls for NEET-PG:** * **Delirium Tremens (DT):** The most severe form of withdrawal (48–96 hours). Features include clouded consciousness, vivid hallucinations, and severe autonomic instability. * **Withdrawal Seizures:** Typically "Rum Fits" (Generalized Tonic-Clonic) occurring 6–48 hours after the last drink. * **Drug of Choice:** **Benzodiazepines** (e.g., Diazepam, Lorazepam) are the gold standard for managing withdrawal symptoms and preventing seizures/DT. * **Wernicke’s Encephalopathy:** Always give **Thiamine** before Glucose to prevent precipitating this condition.

Question 289: Morbid jealousy is seen in which of the following conditions?

A. Alcoholism (Correct Answer)
B. Persons who are socially isolated
C. Social phobia
D. Depression

Explanation: **Explanation:** **Morbid Jealousy** (also known as **Othello Syndrome**) is a psychotic disorder characterized by the delusional belief that one's partner is being unfaithful. It is most strongly associated with **Chronic Alcoholism**. 1. **Why Alcoholism is Correct:** Chronic alcohol use can lead to sexual dysfunction (impotence), which creates feelings of inadequacy and insecurity. To cope with these feelings, the individual projects their inadequacy onto their partner through accusations of infidelity. It is considered a form of **Delusional Disorder (Jealous type)**. In the context of alcoholism, it is often referred to as "Alcoholic Hallucinosis" or a specific paranoid state arising from long-term abuse. 2. **Why Incorrect Options are Wrong:** * **Social Isolation:** While isolation can exacerbate paranoid personality traits, it is not a primary clinical cause of morbid jealousy. * **Social Phobia:** This is an anxiety disorder characterized by a fear of scrutiny in social situations; it does not typically involve delusional jealousy. * **Depression:** While depression can cause "depressive pseudodementia" or "delusions of guilt/worthlessness," morbid jealousy is not a hallmark feature. **Clinical Pearls for NEET-PG:** * **Othello Syndrome:** Named after Shakespeare’s character; it carries a high risk of **domestic violence and homicide**. * **De Clerambault’s Syndrome:** Delusion that a person of higher status is in love with the patient (Erotomania). * **Capgras Syndrome:** Delusion that a familiar person has been replaced by an identical impostor. * **Fregoli Syndrome:** Delusion that different people are actually a single person in disguise.

Question 290: Magnan's symptoms is characterized by which of the following sensations?

A. Illusion
B. Delusion
C. Formication (Correct Answer)
D. Depersonalization

Explanation: **Explanation:** **Magnan’s symptom** (also known as the "cocaine bug") is a classic tactile hallucination associated with chronic **cocaine use**. It is characterized by **formication**, which is the false sensation of insects crawling on or under the skin. 1. **Why Formication is Correct:** In the context of cocaine intoxication or withdrawal, the drug’s effect on dopamine and peripheral nerve endings can trigger sensory disturbances. Patients experiencing Magnan’s symptom may scratch or pick at their skin to "remove" these non-existent insects, leading to excoriations known as "cocaine sores." 2. **Why Other Options are Incorrect:** * **Illusion:** This is a misinterpretation of a real external stimulus (e.g., mistaking a rope for a snake). Magnan’s symptom occurs without any external stimulus, making it a hallucination, not an illusion. * **Delusion:** While a patient might develop a *delusional parasitosis* (the fixed false belief that they are infested), the primary sensory experience itself is a tactile hallucination (formication). * **Depersonalization:** This is a dissociative symptom where one feels detached from their own body or mental processes. It is not a sensory-tactile phenomenon. **High-Yield Clinical Pearls for NEET-PG:** * **Cocaine:** Also associated with **septal perforation** (due to vasoconstriction) and **sympathomimetic toxidrome** (mydriasis, tachycardia, hypertension). * **Formication in other conditions:** It can also be seen in **Alcohol Withdrawal** (Delirium Tremens) and **Ekbom Syndrome** (Delusional Parasitosis). * **Magnan’s Sign vs. Symptom:** While often used interchangeably, it specifically refers to the tactile hallucination of "crawling" sensations unique to chronic cocainism.

Practice by Chapter

Neurobiology of Addiction

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Alcohol Use Disorder

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Opioid Use Disorder

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Cannabis Use Disorder

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Stimulant Use Disorders

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Sedative, Hypnotic, and Anxiolytic Use Disorders

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Tobacco Use Disorder

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Hallucinogen-Related Disorders

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Substance Withdrawal Syndromes

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Pharmacotherapy for Substance Use Disorders

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Psychosocial Interventions

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Dual Diagnosis Management

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