Substance Use Disorders Practice Questions

Q: Which drug is useful in the long-term treatment of alcohol dependence?

Acamprosate. **Explanation:** The management of Alcohol Use Disorder is divided into two phases: **Acute Withdrawal** and **Relapse Prevention (Maintenance)**. **Why Acamprosate is correct:** Acamprosate is a first-line FDA-approved drug for the **long-term maintenance** of abstinence in alcohol-dependent patients. It acts as a GABA agonist and an NMDA antagonist, effectively stabilizing the chemical imbalance in the brain caused by chronic alcohol use (the "post-withdrawal" hyper-excitability). It is particularly useful in patients with liver disease as it is primarily excreted by the kidneys. **Why the other options are incorrect:** * **Chlordiazepoxide:** This is a long-acting benzodiazepine used as the drug of choice for **acute alcohol withdrawal** to prevent seizures and delirium tremens. It is not used for long-term maintenance due to its high potential for dependence. * **Flumazenil:** This is a competitive GABA-A receptor antagonist used specifically for the reversal of **Benzodiazepine overdose**. It has no role in treating alcohol dependence. * **Imipramine:** This is a Tricyclic Antidepressant (TCA). While it may treat comorbid depression, it is not a specific treatment for alcohol dependence. **High-Yield Clinical Pearls for NEET-PG:** * **Disulfiram:** An aversive agent that inhibits *Aldehyde Dehydrogenase*, causing a buildup of acetaldehyde (Disulfiram-like reaction). It requires high patient motivation. * **Naltrexone:** An opioid antagonist that reduces the "craving" and "reward" associated with drinking. It is contraindicated in acute hepatitis or liver failure. * **Acamprosate:** The preferred drug for patients with **liver impairment** but must be avoided in **renal failure** (CrCl < 30 ml/min). * **Wernicke’s Encephalopathy:** Always remember to supplement **Thiamine (B1)** before glucose in alcoholics to prevent neurological complications.

Q: Which of the following is NOT a symptom of cocaine withdrawal?

Hallucinations of insects under the skin. **Explanation:** The correct answer is **D. Hallucinations of insects under the skin.** **Why it is the correct answer:** Hallucinations of insects crawling under the skin (known as **Formication** or **"Cocaine Bugs"**) are a classic symptom of **Cocaine Intoxication**, not withdrawal. This tactile hallucination occurs due to the potent dopaminergic surge in the CNS during acute use. In contrast, cocaine withdrawal (the "crash") is characterized by a state of physiological and psychological depletion. **Why the other options are incorrect:** Cocaine withdrawal typically presents with symptoms that are the polar opposite of the drug’s stimulant effects: * **A. Dysphoria:** As dopamine levels plummet after a binge, patients experience profound "anhedonia" (inability to feel pleasure) and a depressed mood (dysphoria). * **B. Fatigue:** The intense stimulation of the sympathetic nervous system is followed by "crashing," leading to extreme exhaustion and psychomotor retardation. * **C. Disturbed sleep:** Withdrawal is characterized by sleep disturbances, specifically **insomnia followed by hypersomnia** (excessive sleeping) and vivid, unpleasant dreams. **High-Yield NEET-PG Clinical Pearls:** * **Cocaine Withdrawal:** Unlike alcohol or opioid withdrawal, cocaine withdrawal is rarely life-threatening and does not typically require pharmacological intervention. The primary risk is **suicidal ideation** due to severe dysphoria. * **Formication:** Also called **Magnan’s Sign**. It is a key diagnostic clue for stimulant psychosis (Cocaine or Amphetamines). * **Physical Signs of Intoxication:** Look for mydriasis (dilated pupils), tachycardia, hypertension, and potential chest pain (due to coronary vasospasm). * **Treatment:** For acute intoxication/agitation, **Benzodiazepines** are the first-line treatment. Avoid Beta-blockers due to the risk of unopposed alpha-adrenergic stimulation.

Q: Xylene and toluene are types of which of the following?

Inhalants. ### Explanation **Correct Option: A. Inhalants** Xylene and toluene are volatile organic solvents found in common household and industrial products like glue, spray paints, paint thinners, and gasoline. These substances are classified as **Inhalants**. When inhaled, they rapidly cross the blood-brain barrier due to their high lipid solubility, acting as CNS depressants. Toluene is the most common solvent found in inhalants and is known to enhance GABAergic transmission while inhibiting NMDA receptors. **Why other options are incorrect:** * **B. Hallucinogens:** These include substances like LSD, Psilocybin, and Phencyclidine (PCP). While inhalants can cause distortions in perception, they do not belong to the pharmacological class of classic hallucinogens. * **C. Stimulants:** These include drugs like Cocaine and Amphetamines, which increase CNS activity by raising levels of dopamine and norepinephrine. Inhalants generally produce a "high" followed by CNS depression, similar to alcohol. * **D. Anabolic androgenic steroids:** These are synthetic derivatives of testosterone used to increase muscle mass and athletic performance; they have no volatile properties. **High-Yield Clinical Pearls for NEET-PG:** * **Sudden Sniffing Death Syndrome:** The most feared acute complication of inhalant abuse, caused by fatal cardiac arrhythmias due to myocardial sensitization to catecholamines. * **Chronic Toxicity:** Long-term toluene abuse is associated with **leukoencephalopathy** (white matter damage) and peripheral neuropathy. * **Glue Sniffer’s Rash:** An eczematous dermatitis found around the nose and mouth. * **Common User Profile:** Typically seen in adolescents from low socioeconomic backgrounds due to easy accessibility and low cost.

Q: What is the most commonly abused substance that causes dependence?

Heroin. ### Explanation **Correct Answer: B. Heroin** The core concept behind this question is the **addictive potential** (reinforcement strength) of a substance. Heroin, a semi-synthetic opioid, is considered the most addictive substance among the options provided. It has an extremely high potential for dependence because it is highly lipid-soluble, allowing it to cross the blood-brain barrier rapidly. This results in an intense, immediate "rush" by activating the brain's reward system (mu-opioid receptors and dopamine release in the nucleus accumbens), leading to rapid neuroadaptation and severe physical and psychological dependence. **Analysis of Incorrect Options:** * **A. Cocaine:** While cocaine is a potent stimulant with high psychological dependence, its physical withdrawal syndrome is generally less severe than that of opioids like heroin. * **C. Amphetamine:** These stimulants increase synaptic dopamine and have significant abuse potential, but they typically rank lower than heroin in terms of the speed and intensity of dependence formation. * **D. Cannabis:** Although it is one of the most *frequently used* illicit drugs globally, its dependence potential is significantly lower than that of opioids or stimulants. **NEET-PG High-Yield Pearls:** * **Most common substance abuse (General Population):** Caffeine (Global), Tobacco/Alcohol (India). * **Most common illicit drug used:** Cannabis. * **Highest dependence potential:** Heroin (Opioids) > Cocaine > Nicotine. * **Drug of Choice for Opioid Overdose:** Naloxone (Opioid antagonist). * **Drug of Choice for Opioid Withdrawal/Maintenance:** Methadone or Buprenorphine. * **Clinical Sign:** Pinpoint pupils (miosis) is a classic sign of opioid overdose (except for Pethidine).

Q: Which defense mechanism is commonly used by substance abusers?

Denial. **Explanation:** **Denial** is the most characteristic defense mechanism associated with substance use disorders. It is a primitive (narcissistic) defense mechanism where the individual refuses to acknowledge the reality of their addiction or the negative consequences it has on their life, health, and relationships. By using denial, the patient protects themselves from the anxiety and guilt associated with their substance use, often stating, "I can stop whenever I want" or "I don't have a problem." **Analysis of Incorrect Options:** * **Dissociation (A):** This involves a temporary, drastic modification of one’s character or sense of identity to avoid emotional distress (common in PTSD or Dissociative Identity Disorder). * **Introjection (B):** This is the internalizing of the qualities of another person. While it can be a part of normal development, in pathology, it is often seen in depression (turning anger inward). * **Projection (D):** This involves attributing one’s own unacknowledged feelings or impulses to others. While substance abusers may use projection (e.g., "My boss is the one with the temper"), **Denial** is the primary and most pervasive defense mechanism identified in clinical psychiatry for this population. **Clinical Pearls for NEET-PG:** * **The "Big Three" in Addiction:** Denial, Rationalization (justifying use), and Projection are often seen together, but **Denial** is the hallmark. * **Treatment Implication:** Breaking through denial is the primary goal of **Motivational Interviewing (MI)** and the first step in the 12-step program of Alcoholics Anonymous (AA). * **Defense Mechanism Hierarchy:** Denial is classified as a **Level I (Pathological/Narcissistic)** defense mechanism.

Q: A patient with a history of alcohol dependence, 3 days after their last drink, develops behavioral changes. They report seeing 5 cm people throwing stones at them and acting as if they are working in their workshop. They are frightened and pace in and out of the house, with symptoms worsening at night. What is the most likely diagnosis?

Delirium tremens. ### Explanation **Correct Option: A. Delirium Tremens (DT)** The clinical presentation is classic for Delirium Tremens, the most severe form of alcohol withdrawal. * **Timeline:** DT typically occurs **48–96 hours (2–4 days)** after the last drink, matching the "3 days" mentioned. * **Visual Hallucinations:** "Seeing 5 cm people" refers to **Lilliputian hallucinations** (micropsia), which are pathognomonic for DT. * **Occupational Delirium:** Acting as if working in a workshop is a specific sign where patients perform habitual professional tasks in a state of confusion. * **Diurnal Variation:** Symptoms characteristically **worsen at night** (sundowning). The patient’s fear and pacing indicate autonomic hyperactivity and agitation. **Why Incorrect Options are Wrong:** * **B & C. Seizure disorder / Rum fits:** Alcohol withdrawal seizures (Rum fits) typically occur **6–48 hours** after cessation. They are usually generalized tonic-clonic seizures and do not present with prolonged hallucinations or occupational delirium. * **D. Wernicke's encephalopathy:** This is caused by Thiamine (B1) deficiency. While it involves confusion, it is characterized by the triad of **Ophthalmoplegia/Nystagmus, Ataxia, and Confusion**. It does not typically present with vivid Lilliputian hallucinations or the specific timeline of withdrawal delirium. **High-Yield NEET-PG Pearls:** * **Drug of Choice (DOC):** Benzodiazepines (e.g., **Chlordiazepoxide** or Diazepam). If liver failure is present, use **LOT** (Lorazepam, Oxazepam, Temazepam). * **Mortality:** If untreated, DT has a mortality rate of up to 20% (usually due to cardiovascular collapse or hyperthermia). * **Order of Withdrawal:** Tremors (6-12h) → Seizures (6-48h) → Hallucinosis (12-48h) → Delirium Tremens (48-96h). * **Alcoholic Hallucinosis vs. DT:** In hallucinosis, the sensorium is clear (patient is oriented); in DT, there is clouded consciousness/disorientation.

Q: A 55-year-old man presents with a 10-day history of confusion. His friend mentions that he drinks 15 units of alcohol per day. Which of the following strongly suggests a diagnosis of Korsakoff's psychosis?

Confabulation. **Explanation:** **Korsakoff’s Psychosis** is a chronic neuropsychiatric condition resulting from a deficiency of **Thiamine (Vitamin B1)**, typically following untreated or inadequately treated Wernicke’s Encephalopathy in chronic alcoholics. **Why Confabulation is the Correct Answer:** The hallmark of Korsakoff’s syndrome is **anterograde amnesia** (inability to form new memories). To compensate for these gaps in memory, patients unconsciously fill them with fabricated, distorted, or misinterpreted stories. This phenomenon is known as **confabulation**. While the patient is not intentionally lying, they provide these false accounts with full conviction. **Analysis of Incorrect Options:** * **A & C (Delusional beliefs and Auditory hallucinations):** These are psychotic symptoms more characteristic of Alcohol-Induced Psychotic Disorder or Delirium Tremens. They are not core features of Korsakoff’s syndrome. * **B (Poor long-term memory):** In Korsakoff’s, **retrograde amnesia** (loss of past memories) is usually limited. Remote (long-term) memories are often relatively preserved compared to the profound deficit in forming new memories (short-term/anterograde memory). **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Encephalopathy (Acute):** Characterized by the triad of **Ophthalmoplegia** (most common: Abducens nerve palsy), **Ataxia**, and **Confusion**. * **Korsakoff’s Psychosis (Chronic):** Characterized by profound anterograde amnesia and confabulation. * **Neuroanatomy:** The primary lesions are found in the **mammillary bodies** and the dorsomedial nucleus of the thalamus. * **Management:** Always administer **Thiamine before Glucose** in a suspected alcoholic to prevent precipitating Wernicke’s Encephalopathy.

Q: Which of the following drugs is used for alcohol abstinence?

Disulfiram. **Explanation:** The management of Alcohol Use Disorder is divided into two phases: management of acute withdrawal and maintenance of abstinence (relapse prevention). **Correct Option: A. Disulfiram** Disulfiram is a classic **aversive agent** used to maintain abstinence. It works by irreversibly inhibiting the enzyme **Aldehyde Dehydrogenase**. When a patient consumes alcohol while on Disulfiram, acetaldehyde accumulates in the body, leading to the highly unpleasant **Disulfiram-Ethanol Reaction (DER)**, characterized by flushing, tachycardia, nausea, and palpitations. This psychological deterrent discourages the patient from drinking. **Incorrect Options:** * **B. Naltrexone:** While Naltrexone is used in alcohol dependence, its primary role is to **reduce craving** and the "reward" of drinking by blocking opioid receptors. While it helps maintain abstinence, Disulfiram is the classic textbook answer specifically categorized as an abstinence-promoting aversive agent. * **C. Chlordiazepoxide:** This is a long-acting benzodiazepine. It is the **drug of choice for acute alcohol withdrawal** and prevention of Delirium Tremens, but it is not used for long-term abstinence due to its own addictive potential. * **D. Morphine:** This is an opioid agonist and has no role in the treatment of alcohol use disorder; it would potentially lead to poly-substance abuse. **High-Yield Clinical Pearls for NEET-PG:** * **Acamprosate:** Another drug for abstinence; it reduces glutamate activity and is the drug of choice in patients with **liver disease** (unlike Disulfiram/Naltrexone). * **Disulfiram-like reaction:** Can be caused by other drugs like Metronidazole, Griseofulvin, and Cefotetan. * **Topiramate & Baclofen:** Emerging second-line agents for reducing alcohol consumption.

Q: Excessive desire for substance abuse in a drug addict is called:

Craving. ### Explanation **Correct Option: A. Craving** In the context of substance use disorders, **craving** is defined as a strong, subjective desire or an overwhelming urge to consume a particular drug. It is a core clinical feature of addiction and is often triggered by environmental cues associated with previous drug use (e.g., seeing a needle or visiting a specific location). In the DSM-5 criteria, craving is specifically highlighted as a diagnostic criterion for Substance Use Disorders. **Analysis of Incorrect Options:** * **B. Impulse:** This refers to a sudden, unpremeditated urge to act without considering the consequences. While addiction involves impulsivity (especially in early stages), "impulse" is a general behavioral term and not the specific clinical term for the "desire" for a drug. * **C. Dependence:** This is a broader physiological or psychological state where the body requires the substance to function normally. It is characterized by **tolerance** (needing more for the same effect) and **withdrawal** (physical symptoms upon cessation). Dependence is the *state*, whereas craving is the *subjective desire*. * **D. Compulsion:** This refers to repetitive behaviors that an individual feels driven to perform, often to reduce anxiety. In addiction, drug-seeking becomes "compulsive" when the user continues despite clear negative consequences, but the "desire" itself is the craving. **High-Yield Clinical Pearls for NEET-PG:** * **Neurobiology:** Craving is primarily mediated by the **Mesolimbic Dopaminergic Pathway** (the "Reward Pathway"), specifically involving the Nucleus Accumbens and the Ventral Tegmental Area (VTA). * **Anti-craving agents:** * **Alcohol:** Naltrexone, Acamprosate. * **Opioids:** Methadone, Buprenorphine. * **Nicotine:** Varenicline, Bupropion. * **Cue-induced craving** is a major cause of relapse even after long periods of abstinence.

Question 1

A patient with a known history of alcohol dependence experiences a seizure for the first time 12 to 18 hours after their last drink. What is the most appropriate treatment for this condition, often referred to as "rum fits"?

Accepted Answer

Lorazepam

Answer

Phenytoin

Answer

IV Thiamine

Answer

Clobazam

Question 2

Which drug is useful in the long-term treatment of alcohol dependence?

Accepted Answer

Acamprosate

Answer

Chlordiazepoxide

Answer

Flumazenil

Answer

Imipramine

Question 3

Which of the following is NOT a symptom of cocaine withdrawal?

Accepted Answer

Hallucinations of insects under the skin

Answer

Dysphoria

Answer

Fatigue

Answer

Disturbed sleep

Question 4

Xylene and toluene are types of which of the following?

Accepted Answer

Inhalants

Answer

Hallucinogens

Answer

Stimulants

Answer

Anabolic androgenic steroids

Question 5

What is the most commonly abused substance that causes dependence?

Accepted Answer

Heroin

Answer

Cocaine

Answer

Amphetamine

Answer

Cannabis

Question 6

Which defense mechanism is commonly used by substance abusers?

Accepted Answer

Denial

Answer

Dissociation

Answer

Introjection

Answer

Projection

Question 7

A patient with a history of alcohol dependence, 3 days after their last drink, develops behavioral changes. They report seeing 5 cm people throwing stones at them and acting as if they are working in their workshop. They are frightened and pace in and out of the house, with symptoms worsening at night. What is the most likely diagnosis?

Accepted Answer

Delirium tremens

Answer

Seizure disorder

Answer

Rum fits

Answer

Wernicke's encephalopathy

Question 8

A 55-year-old man presents with a 10-day history of confusion. His friend mentions that he drinks 15 units of alcohol per day. Which of the following strongly suggests a diagnosis of Korsakoff's psychosis?

Accepted Answer

Confabulation

Answer

Delusional beliefs

Answer

Poor long-term memory

Answer

Auditory hallucinations

Question 9

Which of the following drugs is used for alcohol abstinence?

Accepted Answer

Disulfiram

Answer

Naltrexone

Answer

Chlordiazepoxide

Answer

Morphine

Question 10

Excessive desire for substance abuse in a drug addict is called:

Accepted Answer

Craving

Answer

Impulse

Answer

Dependence

Answer

Compulsion

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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