Substance Use Disorders Practice Questions

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.

Q: Synesthesia is commonly seen with which of the following substances?

LSD. **Explanation:** **LSD (Lysergic Acid Diethylamide)** is the correct answer because it is a potent hallucinogen that acts primarily as a partial agonist at **5-HT2A receptors**. **Synesthesia** is a hallmark clinical feature of LSD intoxication, characterized by a "blending of senses" or "cross-sensory perception." Patients often describe "hearing colors" or "seeing sounds." This occurs due to increased functional connectivity between sensory regions of the brain that are normally segregated. **Analysis of Incorrect Options:** * **Cocaine:** A stimulant that inhibits the reuptake of dopamine, norepinephrine, and serotonin. It typically causes euphoria, tachycardia, and pupillary dilation, but not synesthesia. * **Opioids (e.g., Morphine, Heroin):** These are CNS depressants that act on mu-opioid receptors. They cause miosis (pinpoint pupils), respiratory depression, and sedation. * **Methadone:** A long-acting synthetic opioid used in detoxification and maintenance therapy for opioid dependence. Like other opioids, it does not induce hallucinogenic sensory blending. **High-Yield Clinical Pearls for NEET-PG:** * **LSD:** Does **not** cause physical dependence or withdrawal symptoms. It is associated with "Bad Trips" (panic reactions) and "Flashbacks" (Hallucinogen Persisting Perception Disorder). * **Pupillary Signs:** LSD causes **Mydriasis** (dilated pupils), whereas Opioids cause **Miosis** (constricted pupils). * **Other Hallucinogens:** Psilocybin (magic mushrooms) and Mescaline (peyote) can also cause similar sensory distortions. * **Management:** Acute LSD intoxication is generally managed with reassurance ("talking down") and benzodiazepines if the patient is severely agitated.

Q: Which of the following is FALSE regarding opiate withdrawal syndrome?

Treated with naltrexone. The correct answer is **C. Treated with naltrexone**. ### **Explanation** Opioid withdrawal syndrome occurs when a person dependent on opioids abruptly stops or reduces intake. It is characterized by autonomic hyperactivity and intense physical discomfort. * **Why Option C is False:** **Naltrexone** is a long-acting **opioid antagonist**. If administered during active withdrawal, it will displace any remaining opioids from the receptors and **precipitate/worsen** a severe withdrawal syndrome. Naltrexone is used for **relapse prevention** (maintenance) only after the patient has been detoxified and is opioid-free for 7–10 days. * **Why Option A is Correct:** Body aches, myalgia, and arthralgia are hallmark symptoms of opioid withdrawal, often described by patients as "pain in the bones." * **Why Option B is Correct:** Mydriasis (pupillary dilatation) is a classic sign of withdrawal (sympathetic overactivity), contrasting with the "pinpoint pupils" (miosis) seen in acute opioid intoxication. * **Why Option D is Correct:** **Methadone** (a long-acting agonist) and **Buprenorphine** (a partial agonist) are the gold-standard pharmacological treatments used to manage withdrawal symptoms by tapering the dose gradually. ### **High-Yield Clinical Pearls for NEET-PG** * **Clinical Features:** Rhinorrhea, lacrimation, yawning, piloerection ("cold turkey"), and diarrhea. * **Severity Assessment:** The **COWS (Clinical Opiate Withdrawal Scale)** is used to monitor symptoms. * **Non-Opioid Management:** **Clonidine** (alpha-2 agonist) can be used to treat autonomic symptoms like tachycardia and hypertension during withdrawal. * **Key Distinction:** Opioid withdrawal is extremely distressing but **rarely life-threatening**, unlike alcohol or benzodiazepine withdrawal, which can cause seizures and death.

Question 1

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 2

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 3

Which of the following conditions is associated with salience?

Accepted Answer

Substance use disorder

Answer

Catatonia

Answer

Depression

Answer

ADHD

Question 4

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 5

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 6

Which drug is used for cocaine withdrawal symptoms?

Accepted Answer

No specific drug

Answer

Fluoxetine

Answer

Lorazepam

Answer

Phenobarbital

Question 7

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 8

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

Accepted Answer

Alcohol

Answer

Cannabis

Answer

Opiates

Answer

Amphetamines

Question 9

Synesthesia is commonly seen with which of the following substances?

Accepted Answer

LSD

Answer

Cocaine

Answer

Opioids

Answer

Methadone

Question 10

Which of the following is FALSE regarding opiate withdrawal syndrome?

Accepted Answer

Treated with naltrexone

Answer

Characterized by body pain

Answer

Characterized by dilatation of pupils

Answer

Treated with methadone

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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