Substance Use Disorders Practice Questions

Q: What is the most common cause of organic amnestic syndrome?

Vitamin deficiency. **Explanation:** The correct answer is **Vitamin deficiency**, specifically **Thiamine (Vitamin B1) deficiency**. **1. Why Vitamin Deficiency is Correct:** Organic amnestic syndrome is characterized by a selective impairment of memory (both anterograde and retrograde) in the absence of generalized cognitive decline (dementia) or clouding of consciousness (delirium). The most common clinical manifestation is **Wernicke-Korsakoff Syndrome**, caused by chronic thiamine deficiency, typically secondary to alcohol use disorder. Thiamine is a vital cofactor for glucose metabolism in the brain; its deficiency leads to bilateral lesions in the **mammillary bodies** and the **dorsomedial nucleus of the thalamus**, which are critical nodes in the memory circuit (Papez circuit). **2. Why Other Options are Incorrect:** * **Alzheimer’s Disease:** While memory loss is a hallmark, it is a **neurodegenerative dementia**. It involves global cognitive decline (aphasia, apraxia, agnosia) rather than a "pure" or "isolated" amnestic syndrome. * **Concussion:** Head trauma can cause transient amnesia (post-traumatic amnesia), but it is usually self-limiting and less common as a chronic cause compared to nutritional deficiencies in clinical practice. * **Hypoxia:** While severe hypoxia (e.g., cardiac arrest) can cause permanent damage to the hippocampus leading to amnesia, it is a less frequent cause than the chronic nutritional deficits seen in the population. **Clinical Pearls for NEET-PG:** * **Korsakoff’s Psychosis:** Characterized by the triad of **Amnesia, Confabulation** (filling memory gaps with imaginary stories), and **Lack of Insight**. * **Wernicke’s Encephalopathy:** The acute precursor; triad includes **Ataxia, Ophthalmoplegia (nystagmus), and Confusion**. * **Key Anatomy:** The **Mammillary bodies** are the most high-yield anatomical site associated with organic amnesia in exams.

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

Hypersomnia. **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).

Q: 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?

Wernicke's encephalopathy. ### 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.

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

Amitriptyline. 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.

Q: 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?

Disulfiram. **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.

Q: Which drug is used for cocaine withdrawal symptoms?

No specific drug. **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.

Q: Which of the following is the most common adverse effect of LSD and its related substances?

Bad trip. **Explanation:** LSD (Lysergic acid diethylamide) is a potent hallucinogen that primarily acts as a partial agonist at 5-HT2A receptors. **Why "Bad Trip" is correct:** A **"Bad Trip" (Acute Panic Reaction)** is clinically documented as the **most common adverse effect** of LSD. It is characterized by intense anxiety, fear of losing control, terrifying hallucinations, and a sense of impending doom. While the experience is subjective, it is the most frequent reason users seek emergency medical attention. Management is primarily supportive, often involving a "talking down" technique or benzodiazepines. **Analysis of Incorrect Options:** * **Flashbacks (Hallucinogen Persisting Perception Disorder):** This is a classic and unique long-term complication where the user re-experiences the drug's effects weeks or months later. While high-yield, it is less frequent than acute bad trips. * **Synaesthesia:** This is a **perceptual phenomenon** (e.g., "hearing colors" or "seeing sounds") rather than an adverse effect. It is a characteristic feature of the LSD experience itself. * **Pupillary dilatation (Mydriasis):** This is a common **physical sign** of LSD intoxication due to sympathomimetic stimulation, but it is considered a physiological effect rather than a clinical "adverse effect" or complication. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** 5-HT2A receptor agonism. * **Physical Signs:** Mydriasis, tachycardia, tremors, and hyperthermia. * **Tolerance:** Develops very rapidly (tachyphylaxis) but there is no physical dependence or withdrawal syndrome. * **Fatal Dose:** LSD has a high therapeutic index; deaths are usually due to behavioral accidents rather than direct toxicity.

Q: Withdrawal delirium, hallucinations, and amnestic disorder are typically seen with which substance?

Alcohol. **Explanation:** The correct answer is **Alcohol**. Alcohol is a central nervous system (CNS) depressant that acts primarily via GABA-A receptors. Chronic use leads to neuroadaptation, and its cessation results in a spectrum of withdrawal symptoms and associated neuropsychiatric syndromes. * **Withdrawal Delirium:** Also known as **Delirium Tremens (DTs)**, this is a medical emergency occurring 48–92 hours after the last drink. It is characterized by clouded consciousness, autonomic hyperactivity (tachycardia, hypertension), and tremors. * **Hallucinations:** Alcohol withdrawal can cause **Alcoholic Hallucinosis**, typically visual or auditory, occurring within 12–24 hours while the patient has a clear sensorium. * **Amnestic Disorder:** Chronic alcohol use leads to Thiamine (Vitamin B1) deficiency, resulting in **Wernicke-Korsakoff Syndrome**. The "Korsakoff" component is a chronic amnestic disorder characterized by anterograde amnesia and confabulation. **Why other options are incorrect:** * **Cannabis:** Withdrawal is mild (irritability, insomnia) and does not typically cause delirium or a specific amnestic disorder. * **Opiates:** Withdrawal is extremely painful ("flu-like" symptoms: rhinorrhea, lacrimation, yawning, dilated pupils) but is **not** life-threatening and does not cause delirium or amnesia. * **Amphetamines:** Intoxication causes psychosis/hallucinations, but withdrawal typically leads to a "crash" (dysphoria, hypersomnia, increased appetite) rather than delirium. **High-Yield Clinical Pearls for NEET-PG:** * **Delirium Tremens Treatment:** Benzodiazepines (Chlordiazepoxide or Diazepam) are the gold standard. * **Wernicke’s Triad:** Confusion, Ataxia, and Ophthalmoplegia (GOA). * **Confabulation:** A hallmark of Korsakoff psychosis where the patient fills memory gaps with fabricated stories. * **Formication:** The sensation of insects crawling on the skin (Cocaine bugs), also seen in alcohol withdrawal.

Question 1

What is the most common cause of organic amnestic syndrome?

Accepted Answer

Vitamin deficiency

Answer

Alzheimer's disease

Answer

Concussion

Answer

Hypoxia

Question 2

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

Accepted Answer

Hypersomnia

Answer

Yawning

Answer

Muscle cramps

Answer

Hypertension

Question 3

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?

Accepted Answer

Wernicke's encephalopathy

Answer

Korsakoff's psychosis

Answer

Alcoholic hallucinosis

Answer

Delirium tremens

Question 4

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

Accepted Answer

Amitriptyline

Answer

Nicotine gum

Answer

Bupropion

Answer

Varenicline

Question 5

Which of the following conditions is associated with salience?

Accepted Answer

Substance use disorder

Answer

Catatonia

Answer

Depression

Answer

ADHD

Question 6

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?

Accepted Answer

Lorazepam

Answer

Phenytoin

Answer

IV Thiamine

Answer

Clobazam

Question 7

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?

Accepted Answer

Disulfiram

Answer

Acamprosate

Answer

Naloxone

Answer

Naltrexone

Question 8

Which drug is used for cocaine withdrawal symptoms?

Accepted Answer

No specific drug

Answer

Fluoxetine

Answer

Lorazepam

Answer

Phenobarbital

Question 9

Which of the following is the most common adverse effect of LSD and its related substances?

Accepted Answer

Bad trip

Answer

Flashbacks

Answer

Synaesthesia

Answer

Papillary dilatation

Question 10

Withdrawal delirium, hallucinations, and amnestic disorder are typically seen with which substance?

Accepted Answer

Alcohol

Answer

Cannabis

Answer

Opiates

Answer

Amphetamines

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

On this page

Practice by Chapter

Want unlimited practice?