Substance Use Disorders — MCQs

A patient with a known history of alcohol dependence, 3 days after their last drink, develops behavioral changes including visual hallucinations (seeing 5 cm people throwing stones) and perceived activities (acting as if working in a workshop). The patient is also experiencing fear, pacing, and worsening symptoms at night. What is the most appropriate initial management for this patient?

Q108Medium

Tactile hallucinations are noticed in which of the following conditions?

Q109Easy

A patient with alcohol dependence is prescribed a drug that necessitates strict avoidance of alcohol due to the risk of a severe adverse drug reaction. Which of the following drugs is commonly used for alcohol aversion therapy?

Q110Medium

Which drug is used for cocaine withdrawal symptoms?

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 101: A 40-year-old man presents to the emergency department conscious and oriented, reporting auditory hallucinations of threatening voices. He has a history of chronic alcohol use. What is the most appropriate diagnosis?

A. Alcoholic hallucinosis (Correct Answer)
B. Delirium tremens
C. Korsakoff psychosis
D. Schizophrenia

Explanation: ### Explanation **1. Why Alcoholic Hallucinosis is Correct:** Alcoholic hallucinosis is a specific withdrawal syndrome characterized by vivid auditory hallucinations (often threatening or accusatory) that occur in a **clear sensorium**. The hallmark of this condition is that the patient remains **conscious and oriented**, which matches the clinical presentation in the question. It typically develops 12–24 hours after the last drink and can persist for days. **2. Why Other Options are Incorrect:** * **Delirium Tremens (DT):** This is a medical emergency characterized by **clouding of consciousness**, disorientation, autonomic instability (tachycardia, hypertension), and tremors. Since the patient is conscious and oriented, DT is excluded. * **Korsakoff Psychosis:** This is a chronic amnestic disorder caused by Thiamine (B1) deficiency. It is characterized by **anterograde amnesia and confabulation**, not acute auditory hallucinations. * **Schizophrenia:** While it involves auditory hallucinations, the diagnosis requires a duration of at least 6 months and is not typically triggered by acute alcohol withdrawal in a patient with a clear history of chronic use. **3. High-Yield Clinical Pearls for NEET-PG:** * **Sensorium:** The most important differentiating factor between Alcoholic Hallucinosis and Delirium Tremens is the **state of consciousness** (Clear in Hallucinosis vs. Clouded in DT). * **Timeline:** Hallucinosis (12–24 hours) occurs earlier than Delirium Tremens (48–72 hours). * **Vital Signs:** Autonomic hyperactivity is prominent in DT but usually absent or mild in Hallucinosis. * **Treatment:** Both are managed with Benzodiazepines (e.g., Diazepam or Lorazepam) to prevent progression and manage withdrawal.

Question 102: All of the following features are associated with Delirium tremens EXCEPT?

A. Agitation
B. Insomnia
C. No loss of sleep (Correct Answer)
D. Reversal of sleep-wake pattern

Explanation: **Explanation:** **Delirium Tremens (DT)** is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. It is a medical emergency characterized by a state of global confusion and severe autonomic hyperactivity. **Why "No loss of sleep" is the correct answer:** Insomnia and severe sleep disturbances are hallmark features of alcohol withdrawal and DT. Patients in DT are profoundly restless and unable to sleep. Therefore, the statement "No loss of sleep" is factually incorrect regarding the clinical presentation of DT. **Analysis of other options:** * **Agitation:** This is a core feature. Patients exhibit psychomotor hyperactivity, extreme restlessness, and can be combative due to sympathetic overactivity. * **Insomnia:** Alcohol withdrawal causes a significant reduction in REM sleep and total sleep time. In DT, patients are often awake for days, contributing to the severity of their delirium. * **Reversal of sleep-wake pattern:** This is a classic sign of delirium. Patients may be drowsy or obtunded during the day but become severely agitated, confused, and hyperactive at night (often referred to as "sundowning"). **Clinical Pearls for NEET-PG:** * **Timeline:** DT typically peaks at **72–96 hours** (3–4 days) after cessation of alcohol. * **Key Triad:** Clouding of consciousness (delirium), vivid hallucinations (mostly visual/tactile), and autonomic instability (tachycardia, hypertension, fever). * **Mortality:** Historically 20%, now <5% with treatment. The most common cause of death is arrhythmia or respiratory failure. * **Drug of Choice:** **Benzodiazepines** (e.g., Diazepam, Lorazepam) are the gold standard for management. * **Distinction:** Unlike "Alcoholic Hallucinosis," DT involves **clouding of consciousness** and **autonomic instability**.

Question 103: Which of the following is NOT a feature of heroin (smack) withdrawal?

A. Yawning
B. Muscle cramps
C. Hypersomnia (Correct Answer)
D. Hypertension

Explanation: **Explanation:** Opioid withdrawal (specifically heroin/smack) is characterized by a state of **autonomic hyperactivity** and CNS irritability. The underlying medical concept is the "rebound effect": since opioids are CNS depressants that cause miosis, constipation, and sedation, their withdrawal results in the exact opposite physiological symptoms. **Why Hypersomnia is the Correct Answer:** Heroin withdrawal causes **Insomnia**, not hypersomnia. Patients are typically restless, anxious, and unable to sleep due to CNS over-excitation. Hypersomnia is instead a hallmark feature of withdrawal from CNS stimulants like **Cocaine or Amphetamines** (often called the "crash"). **Analysis of Incorrect Options:** * **Yawning (Option A):** This is one of the earliest and most characteristic signs of opioid withdrawal, often accompanied by lacrimation (tearing) and rhinorrhea (runny nose). * **Muscle cramps (Option B):** Withdrawal leads to significant musculoskeletal pain, abdominal cramps, and "twitching" of the muscles (the origin of the term "kicking the habit"). * **Hypertension (Option C):** Autonomic instability leads to increased sympathetic output, resulting in hypertension, tachycardia, mydriasis (dilated pupils), and piloerection (goosebumps/ "cold turkey"). **NEET-PG High-Yield Pearls:** * **Objective Sign:** Piloerection is the most objective sign of opioid withdrawal. * **Pupils:** Opioid Intoxication = Pinpoint pupils (Miosis); Opioid Withdrawal = Dilated pupils (Mydriasis). * **Treatment:** **Clonidine** (alpha-2 agonist) is used to manage autonomic symptoms; **Methadone** or **Buprenorphine** are used for detoxification and maintenance. * **Timeline:** Heroin withdrawal typically peaks at 36–72 hours and is rarely life-threatening (unlike alcohol or barbiturate withdrawal).

Question 104: A patient with a history of alcoholism presents with an inability to state their name, gross in-coordination of gait, and nystagmus. What is the probable diagnosis?

A. Wernicke's encephalopathy (Correct Answer)
B. Korsakoff's psychosis
C. Alcoholic hallucinosis
D. Delirium tremens

Explanation: ### Explanation **Correct Option: A. Wernicke’s Encephalopathy** Wernicke’s encephalopathy (WE) is an acute, reversible neuropsychiatric emergency caused by **Thiamine (Vitamin B1) deficiency**, most commonly seen in chronic alcoholics. The diagnosis is clinical and characterized by a classic **triad**: 1. **Ophthalmoplegia/Nystagmus:** (Involuntary eye movements or nerve palsies). 2. **Ataxia:** (Gross in-coordination of gait). 3. **Global Confusion:** (Disorientation, inability to state name/place). The patient in the question exhibits all three components of this triad, making WE the most probable diagnosis. **Why other options are incorrect:** * **B. Korsakoff’s Psychosis:** This is the chronic, often irreversible stage following WE. It is characterized by **anterograde amnesia** and **confabulation** (filling memory gaps with false information) without the acute triad of ataxia and ophthalmoplegia. * **C. Alcoholic Hallucinosis:** This occurs within 12–24 hours of alcohol withdrawal. It is characterized by vivid auditory hallucinations in a state of **clear sensorium** (the patient is oriented), unlike the confusion seen here. * **D. Delirium Tremens:** A severe withdrawal state (48–96 hours after the last drink) featuring autonomic hyperactivity (tachycardia, hypertension), tremors, and clouded consciousness with visual hallucinations. **NEET-PG High-Yield Pearls:** * **Pathology:** Hemorrhagic lesions in the **mammillary bodies** (most common) and periaqueductal gray matter. * **Treatment Rule:** Always administer **Thiamine before Glucose**. Giving glucose first can precipitate or worsen WE by consuming the remaining thiamine stores during glycolysis. * **Reversibility:** Ataxia and confusion improve with treatment, but nystagmus is often the first sign to resolve.

Question 105: All of the following drugs can be used for the treatment for cessation of smoking except:

A. Nicotine gum
B. Amitriptyline (Correct Answer)
C. Bupropion
D. Varenicline

Explanation: The treatment of smoking cessation involves both behavioral therapy and pharmacotherapy. The goal is to manage nicotine withdrawal symptoms and reduce the reinforcing effects of smoking. **Why Amitriptyline is the Correct Answer:** Amitriptyline is a **Tricyclic Antidepressant (TCA)** primarily used for major depression, neuropathic pain, and migraine prophylaxis. While another TCA, **Nortriptyline**, is considered a second-line agent for smoking cessation, Amitriptyline has no proven clinical efficacy for this indication and is not recommended in standard treatment guidelines. **Explanation of Incorrect Options:** * **Nicotine Gum (Option A):** This is a form of **Nicotine Replacement Therapy (NRT)**. It provides a low dose of nicotine to reduce withdrawal cravings without the harmful toxins found in tobacco smoke. * **Bupropion (Option C):** An atypical antidepressant that inhibits the reuptake of dopamine and norepinephrine. It is an FDA-approved first-line non-nicotine therapy that reduces the urge to smoke and minimizes weight gain post-cessation. * **Varenicline (Option D):** A **selective α4β2 nicotinic acetylcholine receptor partial agonist**. It is currently considered the most effective monotherapy for smoking cessation as it reduces withdrawal symptoms (agonist effect) and blocks the "reward" of smoking (antagonist effect). **High-Yield Clinical Pearls for NEET-PG:** * **First-line agents:** Varenicline, Bupropion, and NRTs. * **Varenicline Side Effects:** Most common is nausea; historically linked to neuropsychiatric symptoms (though recent data suggests safety). * **Bupropion Contraindication:** Must be avoided in patients with a **history of seizures** or eating disorders (Bulimia/Anorexia) as it lowers the seizure threshold. * **Second-line agents:** Nortriptyline and Clonidine.

Question 106: Which of the following conditions is associated with salience?

A. Catatonia
B. Depression
C. Substance use disorder (Correct Answer)
D. ADHD

Explanation: **Explanation:** **Salience** (specifically **Incentive Salience**) is a core psychological concept in **Substance Use Disorders (SUD)**. It refers to the process where a previously neutral stimulus (like a syringe, a bar, or a specific smell) becomes associated with drug use and acquires the ability to grab the user's attention and drive "wanting" or craving. 1. **Why Substance Use Disorder is correct:** In addiction, the brain’s mesolimbic dopamine system (the reward pathway) becomes hypersensitized. This leads to **Salience Attribution**, where the drug and its associated cues become the most important focus of the individual's life, overriding natural rewards like food or social interaction. This explains why patients continue drug-seeking behavior despite severe negative consequences. 2. **Why other options are incorrect:** * **Catatonia:** A neuropsychiatric syndrome characterized by motor abnormalities (stupor, waxy flexibility, mutism). It is related to GABA and dopamine dysregulation but not primarily driven by incentive salience. * **Depression:** Typically involves **anhedonia** (loss of interest/pleasure), which is essentially the opposite of salience—a state where previously rewarding stimuli no longer grab attention or provide joy. * **ADHD:** Characterized by executive dysfunction and inattention. While dopamine is involved, the core pathology is a deficit in sustained attention and impulse control, rather than the pathological narrowing of focus onto a specific rewarding cue seen in SUD. **High-Yield Clinical Pearls for NEET-PG:** * **Mesolimbic Pathway:** The primary circuit involved in salience (Ventral Tegmental Area to Nucleus Accumbens). * **Aberrant Salience:** A term often used in **Schizophrenia** to describe how patients attribute significance to neutral external stimuli, leading to delusions. * **ICD-11/DSM-5:** Increased salience is a diagnostic hallmark of dependence, often manifesting as "neglect of alternative pleasures or interests."

Question 107: A patient with a known history of alcohol dependence, 3 days after their last drink, develops behavioral changes including visual hallucinations (seeing 5 cm people throwing stones) and perceived activities (acting as if working in a workshop). The patient is also experiencing fear, pacing, and worsening symptoms at night. What is the most appropriate initial management for this patient?

A. Phenytoin
B. IV Thiamine
C. Lorazepam (Correct Answer)
D. Clobazam

Explanation: ### Explanation The patient is presenting with **Delirium Tremens (DT)**, the most severe form of alcohol withdrawal. Key diagnostic features in this scenario include the onset (72 hours after the last drink), **visual hallucinations** (specifically *micropsia* or "Lilliputian hallucinations"), **occupational delirium** (acting as if at work), and autonomic hyperactivity (fear, pacing, and nocturnal worsening). **1. Why Lorazepam is the Correct Answer:** Benzodiazepines (BZDs) are the gold standard for managing alcohol withdrawal. They act as cross-tolerant agents with alcohol by enhancing GABAergic neurotransmission, which counteracts the CNS hyperexcitability caused by withdrawal. **Lorazepam** is preferred in many clinical settings because it has no active metabolites and is not solely dependent on oxidative metabolism in the liver, making it safer if the patient has underlying alcoholic liver disease (common in chronic alcoholics). **2. Why Other Options are Incorrect:** * **Phenytoin (A):** It is ineffective for alcohol withdrawal seizures. BZDs are the treatment of choice for both withdrawal seizures and delirium. * **IV Thiamine (B):** While essential to prevent Wernicke’s Encephalopathy, it does not treat the acute behavioral or autonomic symptoms of Delirium Tremens. It is a supportive treatment, not the primary management for the delirium itself. * **Clobazam (D):** While a BZD, it is typically used as an adjunctive treatment for epilepsy or mild anxiety. In acute Delirium Tremens, potent, rapid-acting BZDs like Diazepam or Lorazepam are required to achieve rapid sedation. **Clinical Pearls for NEET-PG:** * **Timeline of Withdrawal:** Tremors (6–12h) → Seizures (12–48h) → Hallucinosis (12–24h) → **Delirium Tremens (48–96h).** * **Lilliputian Hallucinations:** Seeing small people or animals; highly characteristic of DT. * **Chlordiazepoxide:** Often the drug of choice for *uncomplicated* withdrawal due to its long half-life, but **Lorazepam/Oxazepam** are preferred in liver failure (Mnemonic: **O**ut **L**ive **T**he liver – **O**xazepam, **L**orazepam, **T**emazepam).

Question 108: Tactile hallucinations are noticed in which of the following conditions?

A. Parkinsonism
B. Chronic depression
C. Chronic cocaine poisoning (Correct Answer)
D. Acute barbiturate poisoning

Explanation: **Explanation:** **Tactile hallucinations** (the false perception of touch or surface sensation) are a hallmark feature of **Chronic Cocaine Poisoning**. In this condition, patients often experience a specific type of tactile hallucination known as **Formication**. This is the sensation of insects crawling under or over the skin, colloquially referred to as **"Cocaine bugs"** or **Magnan’s symptom**. This occurs due to the drug's effect on dopamine levels and peripheral nerve stimulation. **Analysis of Options:** * **A. Parkinsonism:** Typically associated with **visual hallucinations**, often as a side effect of dopaminergic medications (like L-Dopa) or in the context of Lewy Body Dementia. * **B. Chronic Depression:** Hallucinations are rare in depression unless it reaches a **psychotic level**. Even then, they are usually auditory and "mood-congruent" (e.g., voices criticizing the patient). * **D. Acute Barbiturate Poisoning:** This typically presents with CNS depression, respiratory distress, and coma. While *withdrawal* from sedatives can cause hallucinations, acute poisoning does not characteristically present with tactile hallucinations. **High-Yield Pearls for NEET-PG:** * **Formication** is also seen in **Alcohol Withdrawal (Delirium Tremens)** and **Ekbom’s Syndrome** (Delusional Parasitosis). * **Cocaine** acts by inhibiting the reuptake of Dopamine, Norepinephrine, and Serotonin. * **Other Cocaine signs:** Mydriasis (dilated pupils), perforated nasal septum (in chronic snorters), and cardiovascular complications (MI/Arrhythmias). * **Visual hallucinations** are the most common type in organic brain syndromes; **Auditory hallucinations** are most common in Schizophrenia.

Question 109: A patient with alcohol dependence is prescribed a drug that necessitates strict avoidance of alcohol due to the risk of a severe adverse drug reaction. Which of the following drugs is commonly used for alcohol aversion therapy?

A. Disulfiram (Correct Answer)
B. Acamprosate
C. Naloxone
D. Naltrexone

Explanation: **Explanation:** **1. Why Disulfiram is Correct:** Disulfiram is the classic agent used for **Aversion Therapy** in alcohol dependence. It acts as an irreversible inhibitor of the enzyme **Aldehyde Dehydrogenase (ALDH)**. When a patient consumes alcohol while on Disulfiram, the metabolism of ethanol is arrested at the stage of **Acetaldehyde**, leading to its toxic accumulation. This results in the **Disulfiram-Ethanol Reaction (DER)**, characterized by intense flushing, tachycardia, palpitations, nausea, vomiting, and hypotension. The fear of this unpleasant physical reaction serves as a psychological deterrent against drinking. **2. Why Other Options are Incorrect:** * **Acamprosate:** Used for maintaining abstinence. It is a glutamate antagonist and GABA agonist that reduces "protracted withdrawal" symptoms (insomnia, anxiety). It does not cause a reaction with alcohol. * **Naltrexone:** An opioid antagonist that reduces the "reward" or euphoria associated with drinking by blocking endogenous opioid pathways. It reduces cravings and the likelihood of heavy drinking but is not an aversion agent. * **Naloxone:** An intravenous opioid antagonist used primarily for the emergency reversal of acute opioid overdose, not for the long-term management of alcohol dependence. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Disulfiram-like Reaction"** is a common side effect of other drugs like Metronidazole, Griseofulvin, and Cefotetan. * **Contraindications:** Disulfiram should never be given to patients with severe liver disease, heart disease, or psychosis. * **Patient Education:** Patients must be warned to avoid "hidden" alcohol in mouthwashes, perfumes, and cough syrups. * **First-line for Cravings:** Naltrexone and Acamprosate are generally preferred over Disulfiram in modern guidelines due to better safety profiles and compliance.

Question 110: Which drug is used for cocaine withdrawal symptoms?

A. Fluoxetine
B. Lorazepam
C. Phenobarbital
D. No specific drug (Correct Answer)

Explanation: **Explanation:** The management of cocaine withdrawal is primarily supportive. Unlike opioid or alcohol withdrawal, cocaine withdrawal does not typically present with life-threatening physiological symptoms. **1. Why "No specific drug" is correct:** Cocaine withdrawal is characterized by a "crash" involving dysphoria, fatigue, increased appetite, and vivid dreams. While these symptoms are distressing, there is currently **no FDA-approved pharmacological treatment** specifically indicated for cocaine withdrawal. Management focuses on psychological support, a safe environment, and monitoring for suicidal ideation, which is the most significant clinical risk during the withdrawal phase. **2. Analysis of Incorrect Options:** * **Fluoxetine (A):** While SSRIs may be used to treat comorbid depression in long-term recovery, they have no proven efficacy in treating acute cocaine withdrawal symptoms. * **Lorazepam (B):** Benzodiazepines are the treatment of choice for **cocaine toxicity/intoxication** (to manage tachycardia, hypertension, and agitation), but they are not used for withdrawal, which is characterized by lethargy rather than CNS overstimulation. * **Phenobarbital (C):** This is used in the management of alcohol or sedative-hypnotic withdrawal to prevent seizures; it has no role in cocaine withdrawal. **3. High-Yield Clinical Pearls for NEET-PG:** * **Cocaine Intoxication:** Treat with **Benzodiazepines**. Avoid Beta-blockers (due to risk of unopposed alpha-adrenergic stimulation causing hypertensive crisis). * **Cocaine Withdrawal:** Characterized by "the crash," hypersomnia, and hyperphagia. Suicidal ideation is the most dangerous complication. * **Pharmacotherapy for Cocaine Use Disorder (CUD):** While no drug is "specific" for withdrawal, **Topiramate** and **Modafinil** are sometimes used off-label to reduce cravings during maintenance.

Practice by Chapter

Neurobiology of Addiction

Practice Questions

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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