Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 321: What is the most commonly abused substance?

A. Datura
B. Marijuana (Correct Answer)
C. Cocaine
D. Heroin

Explanation: **Explanation:** The correct answer is **Marijuana (Cannabis)**. According to global epidemiological data (WHO) and the National Survey on Extent and Pattern of Substance Use in India, **Cannabis** is the most commonly used illicit drug worldwide and in India. While alcohol and tobacco are the most commonly abused *legal* substances, among the illicit substances listed, Marijuana holds the highest prevalence due to its high availability, perceived low risk, and cultural factors. **Analysis of Options:** * **A. Datura:** This is a potent deliriant and anticholinergic. While it grows wild and is used in forensic/toxicological contexts or occasional ritualistic use, it is not a drug of "choice" for chronic abuse due to its highly unpleasant and dangerous side effects (the "Mad as a hatter" profile). * **C. Cocaine:** A powerful stimulant. While prevalent in specific urban demographics or Western countries, its high cost and lower availability make its overall prevalence much lower than Marijuana. * **D. Heroin:** An opioid with high addiction potential. Although opioid use is a significant public health concern in India (especially in the North-East and Punjab), the absolute number of users is lower than those using Cannabis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common illicit substance:** Marijuana. * **Most common substance of abuse (overall):** Alcohol (followed by Tobacco). * **Active Ingredient:** Delta-9-tetrahydrocannabinol (THC). * **Clinical Sign:** Conjunctival injection (red eyes) and increased appetite ("munchies") are classic signs of intoxication. * **Psychiatric Link:** Chronic use is strongly associated with **Amotivational Syndrome** and can precipitate schizophrenia in genetically vulnerable individuals.

Question 322: Which of the following are true about delirium tremens?

A. Clouding of consciousness, coarse tremors, and hallucination
B. Coarse tremors, hallucination, and autonomic dysfunction
C. Clouding of consciousness, coarse tremors, and autonomic dysfunction (Correct Answer)
D. Clouding of consciousness, hallucination, and autonomic dysfunction

Explanation: **Explanation:** Delirium Tremens (DT) is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. It is characterized by a **classic triad**: 1. **Clouding of Consciousness:** Disorientation to time, place, and person (delirium). 2. **Coarse Tremors:** Marked physical agitation and gross tremors. 3. **Autonomic Hyperactivity:** Tachycardia, hypertension, fever, and diaphoresis. **Why Option C is Correct:** Option C captures all three pillars of the diagnosis. While hallucinations are common in DT, they are not a defining requirement for the diagnosis in the same way that global confusion (clouding of consciousness) and autonomic instability are. **Analysis of Incorrect Options:** * **Options A, B, and D:** These options include **hallucinations**. While visual hallucinations (often of small animals or insects—"micropsia") occur in about 80% of cases, they are also the hallmark of "Alcoholic Hallucinosis." The distinguishing factor of DT is the presence of **clouding of consciousness** and **autonomic dysfunction**, which are absent in simple hallucinosis. **High-Yield Clinical Pearls for NEET-PG:** * **Mortality:** Untreated DT has a mortality rate of up to 20% (usually due to cardiovascular collapse or hyperthermia). * **Drug of Choice:** Benzodiazepines (e.g., Diazepam or Lorazepam) are the gold standard for management. * **Risk Factors:** History of prior DT, age >30, concurrent illness, and heavy daily intake. * **Electrolytes:** Hypomagnesemia and hypokalemia are frequently associated and must be corrected to prevent seizures and arrhythmias.

Question 323: Morbid jealousy is associated with which substance?

A. Alcohol (Correct Answer)
B. Heroin
C. Cannabis
D. LSD

Explanation: **Explanation:** **Morbid Jealousy** (also known as **Othello Syndrome**) is a psychotic disorder characterized by the delusional belief that one's partner is being unfaithful. In the context of psychiatry, it is most strongly and classically associated with **Chronic Alcoholism**. 1. **Why Alcohol is Correct:** Chronic alcohol use can lead to **Alcohol-Induced Psychotic Disorder**. The mechanism involves alcohol-related erectile dysfunction and decreased libido, which leads to feelings of inadequacy and insecurity. The patient projects these insecurities onto their partner, manifesting as persistent, unfounded delusions of infidelity. It is a high-yield association often tested in the context of "delusional disorders." 2. **Why Incorrect Options are Wrong:** * **Heroin (Opioids):** Typically causes euphoria, sedation, and miosis. While withdrawal can cause agitation, it does not characteristically present with specific delusional themes like morbid jealousy. * **Cannabis:** Associated with "Amotivational Syndrome" and acute cannabis-induced psychosis (often paranoid or persecutory), but not specifically linked to Othello syndrome. * **LSD (Hallucinogens):** Primarily causes perceptual distortions (hallucinations, synesthesia) and "bad trips." It does not typically result in structured delusions of jealousy. **Clinical Pearls for NEET-PG:** * **Othello Syndrome** is a form of **Monodelusional Disorder**. * It is a significant risk factor for **domestic violence and homicide**; safety assessment of the partner is a priority. * **Other Alcohol-related Psychotic Symptoms:** * **Alcoholic Hallucinosis:** Auditory hallucinations occurring in a clear sensorium (unlike Delirium Tremens). * **Wernicke-Korsakoff Syndrome:** Due to Thiamine (B1) deficiency. * **Management:** The primary treatment involves abstinence from alcohol and the use of antipsychotics (e.g., Risperidone).

Question 324: Physical withdrawal symptoms are not marked in patients abusing which of the following substances?

A. Pethidine
B. Cannabis (Correct Answer)
C. Opium
D. Alcohol

Explanation: ### Explanation The correct answer is **Cannabis**. **1. Why Cannabis is the correct answer:** Withdrawal symptoms are primarily driven by the rapid clearance of a substance from the body, leading to neurochemical rebound. **Cannabis (THC)** is highly lipophilic and is stored in the body's adipose tissue. It has a very long half-life (approx. 5–7 days). When a user stops consumption, THC is released slowly from the fat stores into the bloodstream, creating a "self-tapering" effect. Consequently, while psychological symptoms (irritability, insomnia, anxiety) occur, **marked physical withdrawal symptoms** (like those seen in opioids or alcohol) are typically absent or very mild. **2. Why the other options are incorrect:** * **Pethidine & Opium (Opioids):** Opioid withdrawal is characterized by intense physical symptoms due to autonomic hyperactivity. Symptoms include lacrimation, rhinorrhea, piloerection (cold turkey), dilated pupils, and severe muscle/abdominal cramps. * **Alcohol:** Alcohol withdrawal is medically significant and potentially life-threatening. It involves marked physical symptoms such as tremors, tachycardia, sweating, and in severe cases, seizures or delirium tremens. **3. High-Yield Clinical Pearls for NEET-PG:** * **Cannabis:** Most commonly used illicit drug worldwide. Long-term use is associated with **Amotivational Syndrome**. * **Flashbacks:** Spontaneous recurrence of the drug experience in the absence of the drug; most common with **LSD**, but can occur with Cannabis. * **Opioid Withdrawal:** Though extremely painful and distressing ("flu-like" symptoms), it is usually **not life-threatening**, unlike Alcohol or Benzodiazepine withdrawal. * **Cocaine:** Another substance where physical withdrawal is not marked; it primarily presents with a "crash" (dysphoria and exhaustion).

Question 325: Which of the following are pharmacologically approved treatments for tobacco addiction?

A. Nicotine and Bupropion (Correct Answer)
B. Bupropion and Mecanylate
C. Nicotine and Mecanylate
D. Nicotine and Dopamine

Explanation: ### Explanation **Correct Answer: A. Nicotine and Bupropion** Tobacco cessation involves targeting the neurobiological pathways of nicotine addiction, specifically the dopaminergic reward system and nicotinic acetylcholine receptors (nAChRs). 1. **Nicotine Replacement Therapy (NRT):** This is a first-line treatment that provides nicotine in a controlled manner (gums, patches, lozenges) to reduce withdrawal symptoms and cravings without the harmful toxins found in tobacco smoke. 2. **Bupropion (Sustained Release):** Originally an atypical antidepressant, it acts as a norepinephrine-dopamine reuptake inhibitor (NDRI) and a weak nicotinic antagonist. It reduces the urge to smoke and minimizes weight gain associated with cessation. **Analysis of Incorrect Options:** * **Mecanylate (Mecamylamine):** While it is a non-selective nicotinic antagonist, it is primarily an antihypertensive agent. It is not FDA-approved as a standalone treatment for tobacco addiction due to its significant side-effect profile. * **Dopamine:** While nicotine increases dopamine levels in the nucleus accumbens, exogenous dopamine administration is not a treatment for addiction. It does not cross the blood-brain barrier effectively and has no role in smoking cessation. **High-Yield Clinical Pearls for NEET-PG:** * **Varenicline:** A **partial agonist** at the $\alpha4\beta2$ nicotinic acetylcholine receptor. It is currently considered the **most effective** monotherapy for smoking cessation. * **Bupropion Contraindications:** Avoid in patients with a history of **seizures** or **eating disorders** (bulimia/anorexia), as it lowers the seizure threshold. * **NRT Precaution:** Should be used with caution in the immediate post-myocardial infarction period. * **The 5 A’s Strategy:** Ask, Advise, Assess, Assist, and Arrange.

Question 326: Korsakoff's psychosis is seen in which of the following conditions?

A. Chronic renal failure (CRF)
B. Alcohol withdrawal (Correct Answer)
C. Marasmus
D. Cirrhosis

Explanation: **Explanation:** **Korsakoff’s Psychosis** is a late-stage manifestation of **Wernicke-Korsakoff Syndrome (WKS)**, primarily caused by a severe deficiency of **Thiamine (Vitamin B1)**. 1. **Why Alcohol Withdrawal is the correct answer:** While Korsakoff’s is technically a result of chronic alcohol *dependence* rather than the acute withdrawal phase itself, it is classically associated with the spectrum of alcohol-related neurological disorders. Chronic alcohol consumption leads to thiamine deficiency through poor dietary intake, impaired gastrointestinal absorption, and reduced hepatic storage. In the context of NEET-PG, "Alcohol withdrawal" is the most relevant clinical setting among the choices where this nutritional deficiency and its neuropsychiatric consequences are encountered. 2. **Why other options are incorrect:** * **CRF & Cirrhosis:** While these involve systemic metabolic derangements, they do not inherently cause the specific thiamine-related neuronal destruction in the mammillary bodies seen in Korsakoff’s. * **Marasmus:** This is a form of severe protein-energy malnutrition. While it involves global nutrient deficiencies, it is not the classic clinical association for Korsakoff’s psychosis. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad of Wernicke’s Encephalopathy:** Confusion, Ataxia, and Ophthalmoplegia (reversible). * **Korsakoff’s Pentad:** Amnesia (Retrograde & Anterograde), Disorientation, Hallucinations, and **Confabulation** (filling memory gaps with imaginary stories). * **Pathology:** Characterized by atrophy of the **mammillary bodies** and dorsomedial nucleus of the thalamus. * **Management:** Always administer **Thiamine before Glucose** to prevent precipitating Wernicke’s Encephalopathy in a malnourished patient.

Question 327: Which of the following is a symptom of opioid withdrawal?

A. Piloerection (Correct Answer)
B. Dry skin
C. Bradycardia
D. Pupillary constriction

Explanation: Opioid withdrawal is a high-yield topic for NEET-PG, characterized by a state of **autonomic hyperactivity**. When chronic opioid use is ceased, the body experiences a "rebound" effect of the sympathetic nervous system. **Explanation of the Correct Answer:** **A. Piloerection:** This is a classic sign of opioid withdrawal. It occurs due to sympathetic overactivity affecting the arrector pili muscles. Historically, this gave rise to the term "cold turkey" because the skin resembles that of a plucked turkey. **Explanation of Incorrect Options:** * **B. Dry skin:** In withdrawal, patients experience **diaphoresis** (profuse sweating) rather than dry skin. * **C. Bradycardia:** Withdrawal causes **tachycardia** and hypertension. Bradycardia is typically seen in opioid intoxication. * **D. Pupillary constriction (Miosis):** This is a hallmark of opioid **intoxication**. In withdrawal, the pupils undergo **mydriasis** (dilation). **High-Yield Clinical Pearls for NEET-PG:** 1. **Symptoms Checklist:** Think of "flu-like" symptoms: Rhinorrhea, lacrimation, yawning, nausea, vomiting, diarrhea, and abdominal cramps. 2. **The "Gooseflesh" Sign:** Piloerection is one of the most specific objective signs of withdrawal. 3. **COWS Scale:** The Clinical Opiate Withdrawal Scale (COWS) is used to rate the severity of these symptoms. 4. **Management:** Clonidine (alpha-2 agonist) is used to treat autonomic symptoms, while Methadone or Buprenorphine are used for long-term detoxification. 5. **Life-threatening?** Unlike alcohol or benzodiazepine withdrawal, opioid withdrawal is extremely distressing but rarely life-threatening in adults.

Question 328: Which of the following is NOT a feature of nicotine withdrawal?

A. Depression
B. Headache
C. Tachycardia (Correct Answer)
D. Anxiety

Explanation: **Explanation:** The correct answer is **C. Tachycardia**. Nicotine is a potent stimulant that acts on nicotinic acetylcholine receptors, leading to the release of catecholamines (epinephrine and norepinephrine). This results in increased heart rate and blood pressure. When a chronic user stops intake, the body experiences a "rebound" effect of the autonomic nervous system. Therefore, **bradycardia** (decreased heart rate), not tachycardia, is a hallmark feature of nicotine withdrawal. **Analysis of Options:** * **A. Depression:** Dysphoric or depressed mood is a common psychological symptom of withdrawal as dopamine levels in the reward pathway (mesolimbic system) drop. * **B. Headache:** This is a frequent physical complaint during the first few days of smoking cessation due to changes in cerebral blood flow. * **D. Anxiety:** Irritability, frustration, and anxiety are core diagnostic criteria for nicotine withdrawal according to DSM-5. **High-Yield NEET-PG Pearls:** * **DSM-5 Criteria for Nicotine Withdrawal:** Includes irritability, anxiety, difficulty concentrating, increased appetite/weight gain, restlessness, depressed mood, and insomnia. * **Timeline:** Withdrawal symptoms typically peak within **24–48 hours** and can last for 2–4 weeks. * **Weight Gain:** This is a specific feature of nicotine withdrawal (due to increased appetite and metabolic changes), which often leads to relapse, especially in female patients. * **Pharmacotherapy:** First-line treatments include **Nicotine Replacement Therapy (NRT)**, **Varenicline** (partial agonist at α4β2 receptors—most effective), and **Bupropion** (atypical antidepressant).

Question 329: A 35-year-old man presented with agitation, global confusion, disorientation, hallucinations, and autonomic hyperactivity. He had his last alcohol drink 5 days ago. Which of the following can be used in the immediate treatment of the condition?

A. Diazepam
B. Carbamazepine
C. Morphine
D. Chlordiazepoxide (Correct Answer)

Explanation: ### Explanation **Diagnosis: Delirium Tremens (DT)** The clinical presentation of agitation, global confusion, disorientation, hallucinations (visual/tactile), and autonomic hyperactivity (tachycardia, hypertension, sweating) occurring 48–96 hours after the last drink is characteristic of **Delirium Tremens**, the most severe form of alcohol withdrawal. **1. Why Chlordiazepoxide is Correct:** Benzodiazepines (BZDs) are the gold standard for managing alcohol withdrawal. They act as cross-tolerant agents with alcohol, enhancing GABAergic neurotransmission to counteract the CNS hyperexcitability caused by glutamate overactivity. **Chlordiazepoxide** is a long-acting BZD with a high therapeutic index, making it ideal for preventing further seizures and managing agitation in DTs. While Diazepam is also used, Chlordiazepoxide is often the preferred choice in standard protocols for its smoother tapering effect due to its long half-life. **2. Why Other Options are Incorrect:** * **A. Diazepam:** While Diazepam is a valid treatment for DTs (especially via IV for rapid control), in the context of this specific question and standard NEET-PG patterns, Chlordiazepoxide is frequently cited as the "drug of choice" for oral detoxification and management of withdrawal symptoms. * **B. Carbamazepine:** This is an anticonvulsant used in mild-to-moderate withdrawal but is **not** effective in preventing or treating Delirium Tremens or withdrawal seizures. * **C. Morphine:** This is an opioid agonist. It has no role in alcohol withdrawal and may worsen respiratory depression or cloud the sensorium further. **Clinical Pearls for NEET-PG:** * **Timeframe:** DTs typically occur **72–96 hours** after the last drink (Option says 5 days, which fits the window). * **Drug of Choice (DOC):** Chlordiazepoxide (Librium) is the DOC for alcohol withdrawal. * **Liver Disease Exception:** If the patient has cirrhosis or liver failure, use **LOT** (Lorazepam, Oxazepam, Temazepam) as they do not undergo hepatic oxidation. * **Wernicke’s Prevention:** Always administer **Thiamine** before Glucose to prevent Wernicke’s Encephalopathy.

Question 330: A person preoccupied with worries about falling ill is described as which of the following?

A. Maniac
B. Hypochondriac (Correct Answer)
C. Depressed
D. Delirium

Explanation: ### Explanation **Correct Answer: B. Hypochondriac** **Hypochondriasis** (now classified in DSM-5 as **Illness Anxiety Disorder**) is characterized by a persistent preoccupation with the fear of having or acquiring a serious, undiagnosed medical illness. This preoccupation is based on a misinterpretation of bodily symptoms (e.g., a minor headache being interpreted as a brain tumor) despite negative medical evaluations and reassurance. The core feature is high anxiety about health rather than the intensity of physical symptoms. **Analysis of Incorrect Options:** * **A. Maniac:** Refers to a person in a state of **Mania** (seen in Bipolar Disorder). It is characterized by an abnormally elevated, expansive, or irritable mood, decreased need for sleep, and pressured speech, rather than health-related worries. * **C. Depressed:** Refers to **Major Depressive Disorder**, characterized by persistent low mood, anhedonia (loss of interest), and feelings of worthlessness. While somatic complaints can occur in depression, the primary feature is not the preoccupation with falling ill. * **D. Delirium:** An acute, transient, and reversible state of confusion characterized by fluctuating consciousness and impaired attention, usually due to an underlying medical condition or substance toxicity. **High-Yield Clinical Pearls for NEET-PG:** * **DSM-5 Update:** Hypochondriasis is now largely replaced by **Illness Anxiety Disorder** (if symptoms are minimal) or **Somatic Symptom Disorder** (if significant physical symptoms are present). * **Duration:** For a diagnosis, the preoccupation must persist for at least **6 months**. * **Doctor Shopping:** These patients frequently undergo multiple investigations and visit various specialists, a behavior known as "doctor shopping." * **Management:** The treatment of choice is **Cognitive Behavioral Therapy (CBT)**. SSRIs may be used if there is comorbid anxiety or depression.

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

Practice Questions

Sedative, Hypnotic, and Anxiolytic Use Disorders

Practice Questions

Tobacco Use Disorder

Practice Questions

Hallucinogen-Related Disorders

Practice Questions

Substance Withdrawal Syndromes

Practice Questions

Pharmacotherapy for Substance Use Disorders

Practice Questions

Psychosocial Interventions

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Dual Diagnosis Management

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