Substance Use Disorders Practice Questions

Q: The intense craving experienced by individuals recovering from chronic alcoholism can be treated by a drug that acts as an antagonist of opioid receptors?

Antagonist of opioid receptors. **Explanation:** The correct answer is **D. Antagonist of opioid receptors**. **Mechanism of Action:** The drug referred to in the question is **Naltrexone**. Alcohol consumption triggers the release of endogenous opioids (endorphins) in the brain, which bind to $\mu$-opioid receptors. This process stimulates the mesolimbic dopaminergic pathway (the "reward system"), leading to the pleasurable effects and reinforcement of drinking. Naltrexone, a long-acting **opioid receptor antagonist**, blocks these receptors. By doing so, it reduces the "high" associated with alcohol and significantly diminishes the **intense craving** for it, helping to prevent relapse in chronic alcoholics. **Analysis of Incorrect Options:** * **A. Agonist of serotonin receptors:** While SSRIs (Selective Serotonin Reuptake Inhibitors) are used to treat comorbid depression in alcoholics, they are not the primary treatment for alcohol craving. * **B. Agonist of alpha adrenoceptors:** Drugs like **Clonidine** (alpha-2 agonist) are used to manage autonomic hyperactivity during **acute alcohol withdrawal** (e.g., hypertension, tachycardia) but do not treat long-term craving. * **C. Agonist of beta adrenoceptors:** Beta-blockers (antagonists) are sometimes used for withdrawal tremors, but beta-agonists have no role in treating alcoholism and may worsen anxiety/tachycardia. **High-Yield Clinical Pearls for NEET-PG:** * **Naltrexone:** First-line for craving reduction. Contraindicated in patients with acute hepatitis, liver failure, or those currently using opioids. * **Acamprosate:** Another first-line agent for maintaining abstinence; it acts as an NMDA receptor antagonist and GABA-A enhancer. It is preferred in patients with liver disease but contraindicated in renal failure. * **Disulfiram:** An aldehyde dehydrogenase inhibitor used for **aversion therapy**. It does not reduce craving but causes a toxic reaction (DDR) if alcohol is consumed.

Q: A 34-year-old man is admitted to a psychiatric observation unit complaining of depression and suicidal ideation following a cocaine binge. During his stay, he starts feeling as if insects are crawling under his skin. This is most typical of which of the following phenomena?

Formication. **Explanation:** The correct answer is **Formication** (Option C). **Why it is correct:** Formication is a specific type of **tactile hallucination** where a patient experiences the sensation of insects crawling on or under the skin. It is a classic symptom associated with high-dose stimulant use, particularly **cocaine** (where it is famously known as **"Cocaine Bugs"** or Magnan’s sign) and amphetamines. In this clinical scenario, the patient’s recent cocaine binge followed by the sensation of crawling insects is a pathognomonic presentation of cocaine-induced tactile hallucinations. **Why the other options are incorrect:** * **Depersonalization (A):** This is a dissociative symptom where an individual feels detached from their own body or mental processes, as if they are an outside observer. It does not involve tactile sensations. * **Dyskinesia (B):** This refers to involuntary, erratic, or writhing muscle movements (e.g., tardive dyskinesia). It is a motor abnormality, not a sensory perception. * **Illusion (D):** An illusion is a misinterpretation of a **real** external stimulus (e.g., mistaking a rope for a snake). In formication, there is no external stimulus present, making it a hallucination rather than an illusion. **High-Yield Clinical Pearls for NEET-PG:** * **Cocaine Bugs (Magnan’s Sign):** Always associate tactile hallucinations + cocaine use. * **Delirium Tremens:** Tactile hallucinations can also occur during alcohol withdrawal, but the context of a "cocaine binge" makes formication the most specific answer here. * **Ekbom Syndrome:** Also known as Delusional Parasitosis, where the patient has a fixed false belief (delusion) of being infested with parasites, often leading to "matchbox sign" (bringing skin debris in a box to show the doctor). * **Visual Hallucinations:** These are the most common type of hallucinations in organic brain syndromes and substance withdrawal.

Q: A 19-year-old woman is brought to a psychiatry outpatient clinic by her boyfriend for depression and suicidal thoughts. The boyfriend reports that the patient yesterday expressed extreme sadness and a desire to die. He further reveals that they, along with a couple of friends, were celebrating for the last three days as exams had ended and on further prodding, it was discovered that they had consumed alcohol and 'other things' as well. He also reported that the patient was in great spirits and enjoying herself until yesterday, but subsequently slept for 20 hours, missed college, and was looking very tired. The patient herself reports feeling very low, feeling hungry, and seeing vivid and upsetting dreams during her sleep. Which of the following is the most likely diagnosis in this patient?

Cocaine withdrawal. The clinical presentation described is a classic case of **Cocaine Withdrawal**, often referred to as a "crash." [1] ### **Why Cocaine Withdrawal is Correct** The patient exhibits the characteristic **triad of cocaine withdrawal**: [1] 1. **Mood disturbances:** Dysphoria, irritability, and suicidal ideation. 2. **Sleep disturbances:** Hypersomnolence (sleeping for 20 hours) and vivid, unpleasant dreams (REM rebound). 3. **Physical symptoms:** Increased appetite (hyperphagia) and profound fatigue/exhaustion. The history of "celebrating" for three days with "other things" suggests a binge of stimulants (Cocaine or Amphetamines). Once the drug is discontinued, dopamine levels plummet, leading to the "crash" symptoms described. [1] ### **Why Other Options are Incorrect** * **Alcohol Withdrawal:** Typically presents with autonomic hyperactivity (tachycardia, tremors, sweating, hypertension) and insomnia, rather than hypersomnolence and increased appetite. * **Bipolar Disorder:** While the "great spirits" followed by depression might mimic Bipolar I (Manic episode), the acute onset following a 3-day party and the specific symptoms of hyperphagia and hypersomnolence point strongly toward substance withdrawal. * **Major Depressive Disorder (MDD):** MDD requires symptoms to persist for at least 2 weeks. The acute onset and the context of substance use make withdrawal a more likely primary diagnosis. ### **Clinical Pearls for NEET-PG** * **Stimulant Withdrawal (Cocaine/Amphetamines):** Think of it as the "opposite" of the high. High = euphoria, insomnia, anorexia. Withdrawal = dysphoria, hypersomnia, hyperphagia. * **Suicide Risk:** Cocaine withdrawal is high-yield because it is associated with a significant, albeit transient, risk of **suicidal ideation**. [1] * **Treatment:** Usually supportive. Symptoms are self-limiting, though severe depression may require observation. [1]

Q: What is the drug of choice for managing alcohol withdrawal?

Chlordiazepoxide. **Explanation** The management of alcohol withdrawal focuses on counteracting the CNS hyperexcitability caused by the sudden cessation of alcohol's GABAergic effects. **Why Chlordiazepoxide is Correct:** Benzodiazepines (BZDs) are the **gold standard** and drug of choice for alcohol withdrawal. They act as cross-tolerant agents with alcohol, enhancing GABA-A receptor activity to prevent seizures, delirium tremens, and autonomic instability. **Chlordiazepoxide** is preferred due to its long half-life and active metabolites, which provide a "built-in" tapering effect, ensuring a smoother withdrawal process with a lower risk of rebound symptoms. **Analysis of Incorrect Options:** * **TEP (Tetraethylthiuram disulfide / Disulfiram):** This is an alcohol deterrent used for **relapse prevention** (maintenance), not withdrawal. It inhibits aldehyde dehydrogenase; using it during active withdrawal can cause a life-threatening Disulfiram-Ethanol Reaction (DER). * **Chlormethiazole:** While historically used for withdrawal due to its sedative properties, it is rarely used today because of its high addictive potential and risk of fatal respiratory depression, especially if combined with alcohol. * **Buspirone:** An anxiolytic used for Generalised Anxiety Disorder. It has no cross-tolerance with alcohol and does not prevent withdrawal seizures or delirium. **High-Yield Clinical Pearls for NEET-PG:** 1. **Liver Disease Exception:** If a patient has significant liver cirrhosis, use **LOT** (Lorazepam, Oxazepam, Temazepam) as they undergo direct glucuronidation and do not have active metabolites. 2. **Wernicke’s Encephalopathy:** Always administer **Thiamine (B1)** before glucose to prevent precipitating Wernicke’s. 3. **Delirium Tremens:** Occurs 48–72 hours after the last drink; characterized by clouded consciousness and autonomic hyperactivity.

Q: The 'flash-back' phenomenon is most commonly associated with the use of which of the following substances?

All of the above. **Explanation:** The **'flash-back' phenomenon**, clinically known as **Hallucinogen Persisting Perception Disorder (HPPD)**, refers to the spontaneous recurrence of sensory distortions (visual trails, intensified colors, or geometric patterns) that were experienced during previous intoxication, occurring long after the substance has left the body. **Why "All of the above" is correct:** While **LSD (Lysergic acid diethylamide)** is the classic substance most frequently associated with flashbacks in medical literature, the phenomenon is not exclusive to it. Flashbacks are a characteristic feature of the entire class of hallucinogens. * **LSD (Option C):** The most potent hallucinogen; flashbacks can occur in up to 15-30% of chronic users. * **Psilocybin (Option B):** Found in "magic mushrooms," it acts on 5-HT2A receptors and can induce similar lingering perceptual disturbances. * **Cannabis (Option A):** Though classified as a cannabinoid, at high doses it possesses hallucinogenic properties and is a well-documented trigger for flashbacks, especially in heavy users or those who have previously used LSD. **Clinical Pearls for NEET-PG:** * **Mechanism:** Flashbacks are often triggered by stress, fatigue, or entering a dark environment. They are generally brief (seconds to minutes). * **Diagnostic Distinction:** Unlike a psychotic break, during a flashback, **reality testing remains intact** (the patient knows the sensations are not real). * **Treatment:** Most cases are self-limiting. If distressing, **Benzodiazepines** are the first-line pharmacological treatment to reduce anxiety and intensity. * **High-Yield Fact:** LSD does not cause physical dependence or withdrawal symptoms, but it produces rapid **tolerance** (tachyphylaxis).

Q: The primary site of lesion in Korsakoff's psychosis is?

Hippocampus. **Explanation:** **Korsakoff’s Psychosis** is a chronic neuropsychiatric condition resulting from a severe deficiency of **Thiamine (Vitamin B1)**, usually following untreated Wernicke’s Encephalopathy in chronic alcoholics. **Why Hippocampus is the correct answer:** The hallmark of Korsakoff’s psychosis is **anterograde amnesia** (inability to form new memories) and **confabulation**. The **hippocampus**, along with the **mammillary bodies** and the **dorsomedial nucleus of the thalamus**, forms the core of the Papez circuit, which is essential for memory consolidation. While the mammillary bodies are the most classic site of atrophy, the **hippocampus** is a primary site of functional and structural lesions that explains the profound memory deficits seen in these patients. **Analysis of Incorrect Options:** * **A. Frontal lobe:** While frontal lobe atrophy can occur in chronic alcoholism (leading to executive dysfunction), it is not the primary site responsible for the amnestic syndrome of Korsakoff’s. * **B. Corpus striatum:** This area is primarily involved in motor control (Basal Ganglia). Lesions here lead to movement disorders (e.g., Parkinsonism or Chorea), not primary memory loss. * **D. Cingulate gyrus:** Although part of the limbic system, it is more involved in emotional processing and attention rather than the primary formation of new memories. **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Encephalopathy Triad:** Confusion, Ataxia, and Ophthalmoplegia (reversible). * **Korsakoff’s Psychosis Tetrad:** Anterograde amnesia, Retrograde amnesia, Confabulation, and Lack of insight (largely irreversible). * **Pathological Hallmark:** Hemorrhagic lesions in the **Mammillary bodies** (most specific) and Thalamus. * **Treatment Rule:** Always administer **Thiamine before Glucose** to prevent precipitating Wernicke’s crisis.

Q: Which of the following is NOT an anti-craving agent used in the management of alcohol withdrawal symptoms?

Nitrafezole. ### Explanation The management of Alcohol Use Disorder involves two distinct phases: management of acute withdrawal and prevention of relapse (anti-craving). **Why Nitrafezole is the correct answer:** **Nitrafezole** is an **aldehyde dehydrogenase inhibitor**, similar to Disulfiram. It is classified as an **Aversive Agent** (Deterrent therapy), not an anti-craving agent. It works by causing the accumulation of acetaldehyde if alcohol is consumed, leading to unpleasant symptoms (nausea, tachycardia, flushing). It does not reduce the physiological "urge" or craving to drink. **Analysis of Incorrect Options:** * **Naltrexone:** An opioid antagonist that blocks the mu-opioid receptors. It reduces the "reward" or euphoria associated with drinking and is a first-line **anti-craving** agent. * **Acamprosate:** A NMDA receptor antagonist and GABA-A agonist. It helps maintain abstinence by reducing the negative reinforcing effects (insomnia, anxiety) of protracted withdrawal. It is a gold-standard **anti-craving** agent. * **Fluoxetine:** While primarily an SSRI, it is used as an adjuvant anti-craving agent, particularly in patients with comorbid depression or Type B alcoholism (early onset, high impulsivity). **High-Yield Clinical Pearls for NEET-PG:** * **First-line anti-craving agents:** Naltrexone and Acamprosate. * **Acamprosate** is preferred in patients with liver disease (excreted renally). * **Naltrexone** is preferred in patients with renal failure (metabolized by the liver) but contraindicated in acute hepatitis or opioid users. * **Topiramate and Baclofen** are other emerging anti-craving agents. * **Disulfiram/Nitrafezole** require high motivation as they work on the principle of fear/punishment rather than craving reduction.

Q: Type B alcohol dependence is associated with all except?

Late onset. This question tests your knowledge of **Babor’s Classification of Alcoholism**, a high-yield topic for NEET-PG. Babor categorized alcoholics into two distinct groups (Type A and Type B) based on clinical characteristics and prognosis. ### **Explanation of the Correct Answer** **Option B (Late onset)** is the correct answer because it is a feature of **Type A**, not Type B alcoholism. * **Type B Alcoholism** is characterized by **early onset** (typically before age 25). These individuals often have a significant family history and a more severe clinical course. * **Type A Alcoholism** is characterized by **late onset** (after age 25), fewer childhood risk factors, and a better prognosis. ### **Analysis of Incorrect Options** * **A. Severe dependence:** Type B individuals show higher levels of alcohol dependence and more frequent physical consequences compared to Type A. * **C. Many childhood risk factors:** Type B is strongly associated with childhood conduct disorders, impulsivity, and a positive family history of alcoholism. * **D. Polysubstance abuse:** Type B alcoholics frequently use other substances (polysubstance abuse) and often have comorbid psychiatric conditions like Antisocial Personality Disorder. ### **High-Yield Clinical Pearls for NEET-PG** To differentiate between the two major classifications of alcoholism, remember this table: | Feature | Type A (Babor) / Type I (Cloninger) | Type B (Babor) / Type II (Cloninger) | | :--- | :--- | :--- | | **Onset** | Late (>25 years) | **Early (<25 years)** | | **Severity** | Mild/Moderate | **Severe** | | **Genetics** | Low genetic influence | **High genetic influence** | | **Personality** | Anxious/Harm-avoidant | **Impulsive/Novelty-seeking** | | **Gender** | Equal in Male/Female | **Predominantly Male** | | **Prognosis** | Good | Poor |

Q: What is true about alcoholic hallucinosis?

It occurs in clear consciousness.. **Explanation:** Alcoholic hallucinosis is a distinct clinical entity characterized by hallucinations (usually auditory) that develop within 12 to 24 hours after the cessation or reduction of heavy alcohol consumption. **Why Option C is Correct:** The hallmark feature of alcoholic hallucinosis is that it occurs in **clear consciousness**. Unlike Delirium Tremens (DT), where the patient is disoriented, confused, and has a clouded sensorium, a patient with alcoholic hallucinosis remains oriented to time, place, and person. Their vital signs are also typically stable. **Analysis of Incorrect Options:** * **Option A:** Recovery is usually rapid. Most cases resolve within **24 to 48 hours**, though some may persist for a few weeks. It rarely becomes chronic. * **Option B:** **Auditory hallucinations** (often threatening or derogatory voices) are the most common type. This contrasts with Delirium Tremens, where visual hallucinations (e.g., microzoopsia) predominate. * **Option D:** It is a relatively uncommon withdrawal symptom, occurring in approximately **2%** of patients with alcohol use disorder, not 10%. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis:** The primary differentiator from Delirium Tremens is the **sensorium**. (Hallucinosis = Clear sensorium; DT = Clouded sensorium). * **Nature of Voices:** The voices are typically in the third person and are often critical or insulting. * **Treatment:** While it often resolves spontaneously, benzodiazepines are used to manage underlying withdrawal, and high-potency antipsychotics (like Haloperidol) may be used if hallucinations are distressing. * **Timeline:** It appears earlier (12–24 hours) than Delirium Tremens (48–72 hours).

Question 1

The intense craving experienced by individuals recovering from chronic alcoholism can be treated by a drug that acts as an antagonist of opioid receptors?

Accepted Answer

Antagonist of opioid receptors

Answer

Agonist of serotonin receptors

Answer

Agonist of alpha adrenoceptors

Answer

Agonist of beta adrenoceptors

Question 2

A 34-year-old man is admitted to a psychiatric observation unit complaining of depression and suicidal ideation following a cocaine binge. During his stay, he starts feeling as if insects are crawling under his skin. This is most typical of which of the following phenomena?

Accepted Answer

Formication

Answer

Depersonalization

Answer

Dyskinesia

Answer

Illusion

Question 3

A 19-year-old woman is brought to a psychiatry outpatient clinic by her boyfriend for depression and suicidal thoughts. The boyfriend reports that the patient yesterday expressed extreme sadness and a desire to die. He further reveals that they, along with a couple of friends, were celebrating for the last three days as exams had ended and on further prodding, it was discovered that they had consumed alcohol and 'other things' as well. He also reported that the patient was in great spirits and enjoying herself until yesterday, but subsequently slept for 20 hours, missed college, and was looking very tired. The patient herself reports feeling very low, feeling hungry, and seeing vivid and upsetting dreams during her sleep. Which of the following is the most likely diagnosis in this patient?

Accepted Answer

Cocaine withdrawal

Answer

Alcohol withdrawal

Answer

Bipolar disorder

Answer

Major depressive disorder

Question 4

What is the drug of choice for managing alcohol withdrawal?

Accepted Answer

Chlordiazepoxide

Answer

TEP

Answer

Chlormethazole

Answer

Buspirone

Question 5

The 'flash-back' phenomenon is most commonly associated with the use of which of the following substances?

Accepted Answer

All of the above

Answer

Cannabis

Answer

Psilocybin

Answer

LSD

Question 6

The primary site of lesion in Korsakoff's psychosis is?

Accepted Answer

Hippocampus

Answer

Frontal lobe

Answer

Corpus striatum

Answer

Cingulate gyrus

Question 7

Which of the following is NOT an anti-craving agent used in the management of alcohol withdrawal symptoms?

Accepted Answer

Nitrafezole

Answer

Fluoxetine

Answer

Naltrexone

Answer

Acamprosate

Question 8

Type B alcohol dependence is associated with all except?

Accepted Answer

Late onset

Answer

Severe dependence

Answer

Many childhood risk factors

Answer

Polysubstance abuse

Question 9

What is true about confabulation?

Accepted Answer

A memory disorder

Answer

Synonymous with false memory syndrome

Answer

It is congenital

Answer

It is an age-related disease

Question 10

What is true about alcoholic hallucinosis?

Accepted Answer

It occurs in clear consciousness.

Answer

Recovery typically requires a time period of 1 year.

Answer

Visual hallucinations are the most common type.

Answer

It occurs in approximately 10% of patients.

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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