Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 261: Use of which drugs may induce symptoms with a close differential diagnosis of paranoid schizophrenia?

A. Benzodiazepine
B. Amphetamines (Correct Answer)
C. Caffeine
D. Heroin

Explanation: **Explanation:** The correct answer is **Amphetamines**. **1. Why Amphetamines are correct:** Amphetamines are potent CNS stimulants that increase the release and inhibit the reuptake of dopamine in the brain (specifically in the mesolimbic pathway). This "dopaminergic surge" can induce **Amphetamine-Induced Psychosis**, which is clinically indistinguishable from the positive symptoms of **Paranoid Schizophrenia**. Patients typically present with clear consciousness but exhibit persecutory delusions, auditory and visual hallucinations, and extreme agitation. The "Dopamine Hypothesis" of schizophrenia is, in fact, partly based on the observation that amphetamines can mimic these psychotic states. **2. Why other options are incorrect:** * **Benzodiazepines:** These are CNS depressants (GABA-A agonists). Withdrawal can cause delirium or seizures, but acute use typically causes sedation and anxiolysis, not paranoid psychosis. * **Caffeine:** While high doses can cause anxiety, restlessness, and tachycardia (caffeinism), it rarely mimics the structured delusional system of paranoid schizophrenia. * **Heroin:** As an opioid, it causes euphoria, respiratory depression, and "pinpoint" pupils. Withdrawal causes autonomic hyperactivity, but not primary paranoid psychosis. **High-Yield Clinical Pearls for NEET-PG:** * **Formication (Magnan’s Sign/Cocaine Bugs):** The sensation of insects crawling under the skin is a classic tactile hallucination associated with stimulant use (Cocaine/Amphetamines). * **Differential Diagnosis:** Unlike schizophrenia, stimulant-induced psychosis often features a higher prevalence of **visual hallucinations** and symptoms usually resolve within days to weeks of abstinence. * **Other Mimics:** Phencyclidine (PCP) and Cocaine are other high-yield substances that can present with similar paranoid features.

Question 262: What is true about alcoholic hallucinosis?

A. Recovery typically requires a time period of 1 year.
B. Visual hallucinations are the most common type.
C. It occurs in clear consciousness. (Correct Answer)
D. It occurs in approximately 10% of patients.

Explanation: **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 263: Which of the following drugs is used in the management of heroin withdrawal symptoms?

A. Buprenorphine
B. Clonidine
C. Dextropropoxyphene
D. Haloperidol (Correct Answer)

Explanation: **Explanation** In the management of opioid withdrawal (such as heroin), the primary goal is to alleviate autonomic hyperactivity and distressing psychological symptoms. While several agents are used, the choice depends on whether the goal is substitution therapy or symptomatic relief. **Why Haloperidol is the Correct Answer (in this context):** Haloperidol is a high-potency typical antipsychotic. In the clinical management of heroin withdrawal, it is specifically used to manage **severe agitation, aggression, or psychotic symptoms** that may emerge during the withdrawal phase. While not a first-line treatment for the physiological symptoms of withdrawal, it is a standard pharmacological intervention for the behavioral disturbances associated with the syndrome. **Analysis of Other Options:** * **Buprenorphine:** A partial mu-opioid agonist. It is a gold-standard treatment for opioid substitution and detoxification, used to prevent withdrawal symptoms by stabilizing opioid receptors. * **Clonidine:** An alpha-2 adrenergic agonist. It is used to treat the **autonomic symptoms** of withdrawal (tachycardia, hypertension, sweating, and lacrimation) by reducing sympathetic outflow. * **Dextropropoxyphene:** An opioid analgesic previously used for detoxification; however, it has been largely banned or phased out in many regions due to its high abuse potential and cardiotoxicity. **NEET-PG High-Yield Pearls:** * **Drug of Choice for Opioid Overdose:** Naloxone (Opioid antagonist). * **Maintenance Therapy:** Methadone (Long-acting agonist) or Buprenorphine. * **Clonidine** does not help with "craving" but is excellent for physical symptoms. * **Objective sign of withdrawal:** Mydriasis (dilated pupils), whereas overdose presents with "pinpoint pupils" (miosis).

Question 264: A pregnant patient with a history of multiple substance abuses reports that her 2-year-old son exhibits developmental delays and difficulty concentrating. Which of the following substances is associated with behavioral and developmental abnormalities in children?

A. Tobacco (Correct Answer)
B. Cocaine
C. Caffeine
D. Marijuana

Explanation: **Explanation:** **Correct Option: A (Tobacco)** Maternal tobacco use during pregnancy is a well-documented risk factor for long-term neurodevelopmental and behavioral issues in offspring. Nicotine crosses the placenta and causes fetal hypoxia by increasing carbon monoxide levels and reducing uterine blood flow. This leads to structural changes in the developing brain. Clinically, children exposed to prenatal tobacco are at a significantly higher risk for **Attention-Deficit/Hyperactivity Disorder (ADHD)**, conduct disorders, and cognitive impairments (lower IQ and developmental delays). **Incorrect Options:** * **B. Cocaine:** While prenatal cocaine exposure is associated with "Crack Baby Syndrome" (low birth weight, irritability, and tremors), long-term studies have shown that its specific impact on cognitive development is less definitive than tobacco when confounding environmental factors are controlled. * **C. Caffeine:** Moderate caffeine consumption (less than 200mg/day) is generally considered safe. While excessive intake is linked to low birth weight, it is not a primary cause of significant developmental or behavioral syndromes. * **D. Marijuana:** Prenatal exposure may lead to subtle executive functioning deficits later in life, but the evidence linking it to gross developmental delays and concentration issues is less robust compared to the established link with tobacco and ADHD. **High-Yield Clinical Pearls for NEET-PG:** * **Tobacco:** Most common cause of **Low Birth Weight (LBW)** and a major risk factor for **SIDS** (Sudden Infant Death Syndrome). * **Alcohol:** The most common *preventable* cause of intellectual disability (Fetal Alcohol Syndrome). Look for smooth philtrum and short palpebral fissures. * **Phenytoin:** Causes Fetal Hydantoin Syndrome (digit hypoplasia, cleft lip/palate). * **Valproate:** Highest risk for Neural Tube Defects (NTDs).

Question 265: Which of the following drugs can be used in opioid de-addiction?

A. Clonidine
B. Diazepam
C. Methadone
D. All of the above (Correct Answer)

Explanation: **Explanation:** Opioid de-addiction involves two distinct phases: **Detoxification** (management of acute withdrawal symptoms) and **Maintenance therapy** (prevention of relapse). The correct answer is "All of the above" because each drug targets a specific component of the withdrawal or recovery process. 1. **Methadone (Option C):** This is a long-acting **mu-opioid receptor agonist**. It is the gold standard for both detoxification and long-term maintenance. It prevents withdrawal symptoms and reduces "craving" by maintaining a steady state of opioid stimulation without the euphoria associated with heroin. 2. **Clonidine (Option A):** An **alpha-2 adrenergic agonist**. Opioid withdrawal causes a "sympathetic storm" (tachycardia, hypertension, sweating, lacrimation, and rhinorrhea) due to hyperactivity of the Locus Coeruleus. Clonidine suppresses this autonomic overactivity, making it a vital non-opioid treatment for acute withdrawal. 3. **Diazepam (Option B):** While not a primary treatment for the addiction itself, benzodiazepines like Diazepam are used as **adjunctive therapy** to manage the intense anxiety, muscle cramps, and insomnia that characterize the withdrawal phase. **High-Yield Clinical Pearls for NEET-PG:** * **Buprenorphine:** A partial mu-agonist and kappa-antagonist; often preferred over methadone due to a lower risk of respiratory depression (ceiling effect). * **Naltrexone:** An opioid antagonist used only *after* detoxification to prevent relapse (patient must be opioid-free for 7–10 days). * **Lofexidine:** A newer alpha-2 agonist, similar to clonidine but with less hypotension, specifically FDA-approved for opioid withdrawal. * **Naloxone:** The drug of choice for acute opioid **overdose** (not de-addiction).

Question 266: A 50-year-old chronic smoker presents with a history of major depressive disorder and ischemic heart disease. He has not received any psychiatric treatment. Which of the following medications is the best option to help him to quit smoking?

A. Bupropion (Correct Answer)
B. Naltrexone
C. Sertraline
D. Nicotine replacement therapy

Explanation: **Explanation:** The patient is a chronic smoker with comorbid **Major Depressive Disorder (MDD)** and **Ischemic Heart Disease (IHD)**. The best choice here is **Bupropion**, as it addresses both smoking cessation and the underlying depression simultaneously. **1. Why Bupropion is correct:** Bupropion is an atypical antidepressant that acts as a **Norepinephrine-Dopamine Reuptake Inhibitor (NDRI)**. It is FDA-approved for both MDD and smoking cessation. It reduces the severity of nicotine withdrawal symptoms and the "reward" associated with smoking. In this clinical scenario, it is preferred because it treats the patient's untreated depression while helping him quit smoking. **2. Why other options are incorrect:** * **Naltrexone:** This is an opioid antagonist primarily used in the management of **Alcohol Use Disorder** and Opioid Use Disorder. It has no established role in smoking cessation. * **Sertraline:** While an effective SSRI for depression, Sertraline is **not** indicated for smoking cessation. It does not significantly reduce nicotine cravings. * **Nicotine Replacement Therapy (NRT):** While NRT is a first-line aid for quitting, it must be used with **extreme caution** in patients with recent myocardial infarction, unstable angina, or severe arrhythmias due to its sympathomimetic effects. Given the patient's IHD and untreated MDD, Bupropion is a more comprehensive therapeutic choice. **High-Yield Clinical Pearls for NEET-PG:** * **Varenicline** (a partial α4β2 nicotinic agonist) is generally the most effective monotherapy for smoking cessation but was not an option here. * **Contraindication for Bupropion:** It is strictly contraindicated in patients with **Seizure Disorders** or **Eating Disorders** (Bulimia/Anorexia) as it lowers the seizure threshold. * **Weight Gain:** Bupropion is often preferred for smokers concerned about post-cessation weight gain.

Question 267: Which of the following questionnaires is used for screening?

A. Alcoholism (Correct Answer)
B. Tobacco use
C. IV drug abuse
D. All of the above

Explanation: **Explanation:** The correct answer is **Alcoholism**. In the context of medical screening, the question refers to the **CAGE questionnaire**, which is the most widely recognized and high-yield screening tool specifically validated for alcohol use disorders. **1. Why Alcoholism is Correct:** The CAGE questionnaire is a 4-item screening tool used in primary care to identify potential alcohol abuse or dependence. The acronym stands for: * **C:** Have you ever felt you should **Cut** down on your drinking? * **A:** Have people **Annoyed** you by criticizing your drinking? * **G:** Have you ever felt bad or **Guilty** about your drinking? * **E:** **Eye-opener**: Have you ever had a drink first thing in the morning to steady your nerves or get rid of a hangover? A score of **2 or more** is considered clinically significant. **2. Why Other Options are Incorrect:** * **Tobacco use:** Screening for tobacco is typically done via direct history taking (pack-years) or the **Fagerström Test** for Nicotine Dependence, which assesses the intensity of physical addiction rather than being a general "CAGE-style" screening. * **IV drug abuse:** While the **DAST-10** (Drug Abuse Screening Test) exists, the CAGE questionnaire was specifically designed for alcohol. Modified versions (CAGE-AID) exist for drugs, but the standard CAGE refers to alcohol. **High-Yield Clinical Pearls for NEET-PG:** * **AUDIT (Alcohol Use Disorders Identification Test):** Developed by the WHO; it is more comprehensive than CAGE and can detect hazardous/harmful drinking. * **CIWA-Ar scale:** Used for monitoring and managing **Alcohol Withdrawal**, not for screening. * **T-ACE:** A variation of CAGE used specifically to screen for alcohol use in **pregnant women**. * **MAST (Michigan Alcoholism Screening Test):** One of the oldest and most accurate, but longer (24 questions) than CAGE.

Question 268: What is the common term used for a heavy user of LSD?

A. Acid head (Correct Answer)
B. Guide
C. Main liner
D. Tripper

Explanation: **Explanation:** **LSD (Lysergic Acid Diethylamide)** is a potent hallucinogen derived from the ergot fungus. In psychiatric and substance use terminology, a chronic or heavy user of LSD is colloquially referred to as an **"Acid head."** This term stems from the common street name for LSD, which is "Acid." **Analysis of Options:** * **Acid head (Correct):** Refers to a frequent user of LSD. These individuals often exhibit a high degree of psychological dependence and may experience long-term perceptual changes. * **Guide:** In the context of hallucinogen use, a "guide" (or "sitter") is an experienced person who remains sober to supervise and support an individual during an LSD "trip" to prevent "bad trips" or self-harm. * **Main liner:** This term refers to a drug user who injects substances (typically opioids like heroin) directly into a vein. LSD is almost exclusively taken orally (via blotter paper). * **Tripper:** This is a general term for someone currently under the influence of a hallucinogen (experiencing a "trip"), but it does not specifically denote a chronic or heavy user. **Clinical Pearls for NEET-PG:** * **Mechanism of Action:** LSD acts as a partial agonist at **5-HT2A receptors**. * **Hallucinogen Persisting Perception Disorder (HPPD):** Also known as **"Flashbacks,"** where the user re-experiences the drug's effects weeks or months after the last dose. * **Physical Signs:** Marked **mydriasis** (dilated pupils), tachycardia, and tremors. * **Tolerance:** Develops very rapidly (tachyphylaxis) but there is no physical withdrawal syndrome.

Question 269: Physical and psychological dependence with tolerance and withdrawal symptoms, and an inability to control drinking is termed as:

A. Alpha alcoholism
B. Beta alcoholism
C. Gamma alcoholism (Correct Answer)
D. Delta alcoholism

Explanation: ### Explanation This question refers to **Jellinek’s Classification of Alcoholism**, a high-yield framework used to categorize patterns of alcohol consumption based on psychological and physiological impact. **1. Why Gamma Alcoholism is Correct:** **Gamma Alcoholism** is considered the most severe and clinically significant form. It is characterized by: * **Acquired tissue tolerance:** The body requires increasing amounts to achieve the same effect. * **Physical dependence:** Manifested by withdrawal symptoms upon cessation. * **Loss of control:** The individual cannot stop once they start drinking. * **Progression:** It typically leads to significant social, physical, and psychological deterioration. **2. Analysis of Incorrect Options:** * **Alpha Alcoholism:** Represents purely **psychological dependence**. Alcohol is used as a "crutch" to relieve emotional or physical pain. There is no loss of control or withdrawal symptoms. * **Beta Alcoholism:** Involves **physical complications** (e.g., cirrhosis, gastritis) due to heavy drinking, but notably lacks both physical and psychological dependence. * **Delta Alcoholism:** Similar to Gamma, but characterized by the **inability to abstain** rather than a loss of control. The individual drinks constantly but rarely gets "drunk" or loses control; however, they cannot go a day without alcohol without experiencing withdrawal. **3. Clinical Pearls for NEET-PG:** * **Epsilon Alcoholism:** Also known as **Dipsomania** or periodic drinking (binge drinking). * **Crucial Distinction:** Remember **Gamma = Loss of Control** (cannot stop once started) vs. **Delta = Inability to Abstain** (cannot stop for a day). * Jellinek’s classification is a classic "old-school" psychiatry topic that frequently appears in competitive exams to test the distinction between psychological and physiological dependence.

Question 270: Which of the following parts of the brain is commonly involved in the pathology of Wernicke's encephalopathy?

A. Mamillary body (Correct Answer)
B. Frontal cortex
C. Pituitary gland
D. Temporal lobe

Explanation: **Explanation:** **Wernicke’s Encephalopathy (WE)** is an acute neuropsychiatric emergency caused by a deficiency of **Thiamine (Vitamin B1)**, most commonly seen in chronic alcohol use disorder. Thiamine is a critical cofactor for glucose metabolism; its deficiency leads to mitochondrial dysfunction and selective neuronal death in specific brain regions. **Why Mamillary Body is Correct:** The **Mamillary bodies** (part of the posterior hypothalamus) are the most characteristic and frequently involved structures in WE. They are highly sensitive to thiamine deficiency, showing petechial hemorrhages, gliosis, and atrophy. On MRI, T2-weighted images often show hyperintensities in the mamillary bodies, periaqueductal gray matter, and the walls of the third ventricle. **Why Other Options are Incorrect:** * **Frontal Cortex:** While chronic alcohol use can lead to generalized cortical atrophy, the frontal cortex is not the primary or diagnostic site for the acute pathology of Wernicke’s. * **Pituitary Gland:** This is an endocrine gland and is not involved in the pathophysiology of thiamine deficiency. * **Temporal Lobe:** While the hippocampus (medial temporal lobe) is involved in memory, the specific lesions of WE are localized to the diencephalon and brainstem rather than the temporal neocortex. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** 1. Global Confusion (Encephalopathy), 2. Ophthalmoplegia/Nystagmus, 3. Ataxia (**Mnemonic: CAN** – Confusion, Ataxia, Nystagmus). * **Korsakoff Syndrome:** If untreated, WE progresses to Korsakoff's, characterized by **anterograde amnesia** and **confabulation**. * **Management Rule:** Always administer **Thiamine before Glucose**. Giving glucose first can precipitate or worsen WE by consuming the remaining thiamine stores. * **Pathology:** Look for "petechial hemorrhages" in the mamillary bodies on autopsy.

Practice by Chapter

Neurobiology of Addiction

Practice Questions

Alcohol Use Disorder

Practice Questions

Opioid Use Disorder

Practice Questions

Cannabis Use Disorder

Practice Questions

Stimulant Use Disorders

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Sedative, Hypnotic, and Anxiolytic Use Disorders

Practice Questions

Tobacco Use Disorder

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Hallucinogen-Related Disorders

Practice Questions

Substance Withdrawal Syndromes

Practice Questions

Pharmacotherapy for Substance Use Disorders

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Psychosocial Interventions

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Dual Diagnosis Management

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