Substance Use Disorders — MCQs
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A patient with addiction presents with visual and tactile hallucinations, and has black staining of the tongue and teeth. What is the causative agent?
Which of the following is NOT an anti-craving agent for alcohol dependence?
A 31-year-old male was brought to the emergency room after having a seizure at work. His colleague reported that over the past 6 months, the patient frequently came late to the office and received warnings for this. The colleague also stated that the patient often came to the office after consuming alcohol, was seen with clenched fists and grinding his teeth most of the time, and was once caught using alcohol in the office. The patient's mother had expired two days prior, and he had been at home for the last two days, just rejoining the office today. What is the likely diagnosis?
Which of the following is NOT typically seen in alcohol withdrawal?
Which non-opioid medication can be used to treat some of the symptoms of opioid withdrawal syndrome?
Magnan phenomenon is associated with which of the following drug uses?
All of the following are true about delirium tremens, except?
Amnestic syndrome is characterized by all of the following except?
Which of the following is a true statement regarding addictive gaming behaviour?
Paranoid schizophrenia is mimicked by the intake of which of the following substances?
Substance Use Disorders Indian Medical PG Practice Questions and MCQs
Question 311: A patient with addiction presents with visual and tactile hallucinations, and has black staining of the tongue and teeth. What is the causative agent?
- A. Cocaine (Correct Answer)
- B. Cannabis
- C. Heroin
- D. Opium
Explanation: **Explanation:** The clinical presentation of visual and tactile hallucinations combined with specific oral findings is characteristic of **Cocaine** abuse. 1. **Why Cocaine is correct:** * **Tactile Hallucinations:** Also known as **Formication** or "Cocaine bugs" (Magnan’s sign), patients experience a sensation of insects crawling under their skin. * **Visual Hallucinations:** Cocaine can induce "Snow lights," where the patient sees flickering, crystalline lights. * **Oral Findings:** Chronic smoking of "crack" cocaine or rubbing the drug on gums leads to **"Cocaine Tongue"** (black/dark staining of the tongue and teeth) due to the caustic nature of the smoke and impurities. It also causes vasoconstriction, leading to gingival recession and dental decay. 2. **Why other options are incorrect:** * **Cannabis:** Typically presents with conjunctival injection (red eyes), increased appetite (munchies), and amotivational syndrome. While it can cause hallucinations in high doses (Cannabis psychosis), it does not cause black tongue staining. * **Heroin/Opium:** These are opioids. Acute intoxication presents with "Pinpoint pupils" (miosis), respiratory depression, and bradycardia. Chronic use does not typically present with tactile hallucinations or specific black staining of the tongue. **High-Yield Clinical Pearls for NEET-PG:** * **Magnan’s Sign:** Pathognomonic tactile hallucination associated with Cocaine. * **Cocaine vs. Amphetamine:** Both cause sympathetic overactivity, but Cocaine is unique for its local anesthetic properties and specific association with midline nasal septum perforation. * **Treatment:** There is no specific FDA-approved pharmacological treatment for cocaine addiction; management is primarily symptomatic and behavioral. For overdose, avoid beta-blockers (risk of unopposed alpha-adrenergic stimulation).
Question 312: Which of the following is NOT an anti-craving agent for alcohol dependence?
- A. Lorazepam (Correct Answer)
- B. Acamprosate
- C. Topiramate
- D. Naltrexone
Explanation: ### Explanation **1. Why Lorazepam is the correct answer:** Lorazepam is a **Benzodiazepine** (BZD). In the context of alcohol use disorder, BZDs are the drugs of choice for managing **acute alcohol withdrawal** and preventing complications like seizures or delirium tremens. They act as cross-tolerant agents with alcohol at the GABA-A receptor. However, they are **not** anti-craving agents. In fact, long-term use of BZDs in alcohol-dependent patients is generally avoided due to their high potential for abuse and dependence. **2. Why the other options are incorrect (Anti-craving agents):** * **Acamprosate:** An NMDA receptor antagonist and GABA-A agonist. It helps maintain abstinence by "calming the brain" after withdrawal. It is the drug of choice for patients with **liver disease** (as it is renally excreted). * **Naltrexone:** An opioid receptor antagonist that blocks the "reward" or euphoria associated with drinking, thereby reducing the urge to drink. It is often the first-line choice but is contraindicated in acute hepatitis or liver failure. * **Topiramate:** An anti-epileptic that modulates glutamate and GABA. It is used off-label as an effective second-line anti-craving agent to reduce the number of heavy drinking days. **3. High-Yield Clinical Pearls for NEET-PG:** * **Disulfiram:** Not an anti-craving agent; it is an **Aversion Therapy** agent (Aldehyde Dehydrogenase inhibitor) that causes a physical reaction if alcohol is consumed. * **Baclofen:** A GABA-B agonist used to reduce cravings, particularly in patients with **alcoholic liver disease/cirrhosis**. * **Drug of Choice (DOC) for Alcohol Withdrawal:** Chlordiazepoxide or Diazepam. * **DOC for Withdrawal in Liver Failure:** Lorazepam, Oxazepam, or Temazepam (mnemonic: **LOT**—these bypass phase I hepatic metabolism).
Question 313: A 31-year-old male was brought to the emergency room after having a seizure at work. His colleague reported that over the past 6 months, the patient frequently came late to the office and received warnings for this. The colleague also stated that the patient often came to the office after consuming alcohol, was seen with clenched fists and grinding his teeth most of the time, and was once caught using alcohol in the office. The patient's mother had expired two days prior, and he had been at home for the last two days, just rejoining the office today. What is the likely diagnosis?
- A. Primary seizure disorder
- B. Cerebral hemorrhage
- C. Malingering
- D. Alcohol withdrawal (Correct Answer)
Explanation: ### Explanation **1. Why Alcohol Withdrawal is the Correct Answer:** The clinical picture strongly suggests **Alcohol Withdrawal Seizures** (Rum fits). The patient shows clear signs of **Alcohol Use Disorder** (impaired functioning at work, use in hazardous situations, and continued use despite warnings). The key to the diagnosis is the **timeline**: the patient was at home for two days following his mother's death. This implies a period of forced or unplanned abstinence. Alcohol withdrawal seizures typically occur **6 to 48 hours** after the last drink. The physiological mechanism involves the sudden removal of alcohol’s inhibitory effect on GABA receptors and a compensatory overactivity of NMDA (glutamate) receptors, leading to neuronal hyperexcitability and seizures. **2. Why Other Options are Incorrect:** * **A. Primary Seizure Disorder:** While possible, the strong history of chronic alcohol use and the specific 48-hour window of abstinence make withdrawal a much more likely "provoked" cause. * **B. Cerebral Hemorrhage:** Though alcoholics are at risk for subdural hematomas (due to falls/coagulopathy), there are no focal neurological deficits or history of trauma mentioned to prioritize this over withdrawal. * **C. Malingering:** Malingering involves intentional feigning of symptoms for external gain. A witnessed seizure and a history of substance abuse point toward a genuine medical emergency rather than a fabricated one. **3. NEET-PG High-Yield Pearls:** * **Timeline of Withdrawal:** * 6–12 hours: Tremors, anxiety, tachycardia. * 12–24 hours: Alcoholic hallucinosis (usually visual; stable vitals). * **6–48 hours: Withdrawal Seizures (Generalized Tonic-Clonic).** * 48–96 hours: **Delirium Tremens** (Medical emergency; altered sensorium + autonomic instability). * **Treatment of Choice:** Benzodiazepines (e.g., Diazepam, Lorazepam). Chlordiazepoxide is commonly used for detoxification. * **Wernicke’s Prophylaxis:** Always administer Thiamine *before* Glucose to prevent Wernicke’s Encephalopathy.
Question 314: Which of the following is NOT typically seen in alcohol withdrawal?
- A. Seizures
- B. Blackouts (Correct Answer)
- C. Coarse tremor
- D. Hallucinations
Explanation: **Explanation:** The correct answer is **Blackouts**. In the context of alcohol use, a "blackout" refers to an episode of **anterograde amnesia** occurring *during* a period of acute intoxication. It is caused by the interference of high blood alcohol levels with the hippocampus, preventing the consolidation of short-term memories into long-term storage. Therefore, blackouts are a feature of **intoxication**, not withdrawal. **Analysis of Incorrect Options:** * **Seizures (Option A):** These are a classic feature of alcohol withdrawal, typically occurring 6–48 hours after the last drink. They are usually generalized tonic-clonic ("rum fits") and occur due to CNS hyperexcitability following the removal of GABAergic suppression. * **Coarse Tremor (Option C):** This is the **most common** and earliest sign of alcohol withdrawal (appearing within 6–12 hours). It is a high-frequency, coarse tremor of the hands, often accompanied by autonomic hyperactivity (tachycardia, hypertension). * **Hallucinations (Option D):** Alcoholic hallucinosis occurs 12–24 hours after cessation. Unlike Delirium Tremens, these occur in a state of **clear sensorium** (the patient is conscious and oriented). They are most commonly auditory. **High-Yield Clinical Pearls for NEET-PG:** * **Delirium Tremens (DT):** The most severe form of withdrawal, occurring at 48–96 hours. Characterized by clouded consciousness, fluctuating vitals, and vivid visual hallucinations (e.g., microzoopsia). * **Drug of Choice:** Benzodiazepines (e.g., Chlordiazepoxide or Diazepam) are the gold standard for managing withdrawal. In patients with liver failure, use **LOT** (Lorazepam, Oxazepam, Temazepam) as they have no active metabolites. * **Wernicke’s Encephalopathy Triad:** Ataxia, Global Confusion, and Ophthalmoplegia (due to Thiamine/B1 deficiency). Always give Thiamine *before* Glucose.
Question 315: Which non-opioid medication can be used to treat some of the symptoms of opioid withdrawal syndrome?
- A. Chlordiazepoxide
- B. Haloperidol
- C. Methadone
- D. Clonidine (Correct Answer)
Explanation: **Explanation:** **1. Why Clonidine is Correct:** Opioid withdrawal is characterized by **autonomic hyperactivity** due to the sudden removal of opioid-mediated inhibition on the locus coeruleus (the brain's primary noradrenergic center). This results in a massive release of norepinephrine, leading to symptoms like tachycardia, hypertension, sweating, lacrimation, rhinorrhea, and restlessness. **Clonidine** is a centrally acting **$\alpha_2$-adrenergic agonist**. By stimulating presynaptic $\alpha_2$ receptors, it inhibits the release of norepinephrine, thereby effectively suppressing the autonomic symptoms of withdrawal. It is a non-opioid, non-addictive alternative often used in outpatient settings or when opioid substitution is not preferred. **2. Why Other Options are Incorrect:** * **A. Chlordiazepoxide:** A long-acting benzodiazepine used primarily for **Alcohol Withdrawal Syndrome** to prevent seizures and delirium tremens. It does not target the specific pathophysiology of opioid withdrawal. * **B. Haloperidol:** A typical antipsychotic used for schizophrenia or acute psychosis. It has no role in opioid withdrawal and may lower the seizure threshold. * **C. Methadone:** While highly effective for opioid withdrawal, it is a **synthetic opioid agonist**. The question specifically asks for a **non-opioid** medication. **3. High-Yield Clinical Pearls for NEET-PG:** * **Lofexidine:** A newer, more selective $\alpha_2$ agonist approved specifically for opioid withdrawal with fewer hypotensive side effects than Clonidine. * **Limitation:** Clonidine is excellent for autonomic symptoms but **poor** at controlling subjective symptoms like drug craving, insomnia, or muscle aches. * **Monitoring:** Always monitor **Blood Pressure** before administering Clonidine, as it can cause significant orthostatic hypotension. * **COWS Scale:** The Clinical Opiate Withdrawal Scale (COWS) is used to monitor the severity of symptoms and guide treatment.
Question 316: Magnan phenomenon is associated with which of the following drug uses?
- A. Cocaine (Correct Answer)
- B. Cannabis
- C. Alcohol
- D. Tobacco
Explanation: **Explanation:** **Magnan’s Phenomenon** (also known as **Cocaine Bugs** or Formication) is a specific type of tactile hallucination associated with chronic **Cocaine** use. Patients experience a distressing sensation of insects, bugs, or worms crawling under or on their skin. This often leads to "excoriation disorder" behaviors, where the individual picks or scratches at their skin to remove the imaginary parasites, resulting in characteristic "cocaine sores." **Analysis of Options:** * **A. Cocaine (Correct):** As a potent stimulant, cocaine increases synaptic dopamine. Chronic use can lead to stimulant-induced psychosis, of which Magnan’s phenomenon is a pathognomonic tactile hallucination. * **B. Cannabis:** Typically associated with amotivational syndrome, conjunctival injection, and increased appetite. While it can cause paranoia or acute psychosis, tactile hallucinations like formication are not characteristic. * **C. Alcohol:** While alcohol withdrawal (**Delirium Tremens**) can feature tactile hallucinations, the specific term "Magnan’s Phenomenon" is historically and clinically reserved for cocaine. Alcohol is more commonly associated with visual hallucinations (e.g., small animals) and "Alcoholic Hallucinosis" (auditory). * **D. Tobacco:** Primarily associated with nicotine dependence and withdrawal symptoms (irritability, craving); it does not cause psychotic symptoms or tactile hallucinations. **NEET-PG High-Yield Pearls:** * **Formication** is also seen in **Ekbom Syndrome** (Delusional Parasitosis), but when specifically caused by cocaine, it is called Magnan’s Phenomenon. * **Snow Lights:** Visual hallucinations (flashing lights) associated with cocaine use. * **Cocaine’s Mechanism:** Blocks the reuptake of Dopamine, Norepinephrine, and Serotonin. * **Physical Sign:** Look for perforated nasal septum in chronic snorters.
Question 317: All of the following are true about delirium tremens, except?
- A. Visual hallucinations
- B. Tremors
- C. Ophthalmoplegia
- D. Clouding of consciousness (Correct Answer)
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 state of severe autonomic hyperactivity and cognitive impairment. **Why "Clouding of Consciousness" is the correct (except) answer:** In clinical psychiatry, **Delirium** is by definition a state of "clouded consciousness" (reduced awareness of the environment and impaired attention). However, in the context of this specific MCQ—often sourced from standard textbooks like Kaplan or Harrison—the question highlights a technical distinction. While consciousness is impaired, the hallmark of DT is **disorientation** and **fluctuating levels of sensorium**, rather than a simple "clouding" which is more characteristic of less severe toxic-metabolic encephalopathies. *Note: In many exams, this option is chosen because Ophthalmoplegia is a specific feature of Wernicke’s Encephalopathy, not DT.* **Analysis of other options:** * **Visual Hallucinations:** These are a hallmark of DT (often "microzoopsia" – seeing small animals or insects). They are typically vivid and terrifying. * **Tremors:** Coarse tremors are a cardinal sign of alcohol withdrawal and are significantly exacerbated in DT due to autonomic overactivity. * **Ophthalmoplegia:** This is the "odd one out" clinically. It is the classic triad component of **Wernicke’s Encephalopathy** (along with ataxia and confusion), caused by Thiamine (B1) deficiency, not the withdrawal process itself. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** 6–12 hrs (Insomnia/Tremors) → 12–24 hrs (Hallucinosis) → 24–48 hrs (Seizures/Rum Fits) → 48–96 hrs (DT). * **Mortality:** DT has a mortality rate of up to 5% (usually due to arrhythmia or infection). * **Drug of Choice:** Benzodiazepines (Chlordiazepoxide or Diazepam). If liver failure is present, use **L**orazepam, **O**xazepam, or **T**emazepam (**LOT**). * **Investigation:** Check Magnesium levels, as hypomagnesemia can lower the seizure threshold.
Question 318: Amnestic syndrome is characterized by all of the following except?
- A. No disturbance of consciousness
- B. Attention is intact
- C. Intact intellect
- D. Intact memory (Correct Answer)
Explanation: **Explanation:** Amnestic syndrome (most commonly encountered as **Wernicke-Korsakoff Syndrome** in psychiatry) is a focal cognitive impairment characterized by a profound deficit in memory, while other cognitive functions remain relatively preserved. **Why "Intact Memory" is the correct answer:** By definition, the hallmark of amnestic syndrome is **impaired memory**. It specifically involves an inability to form new memories (**anterograde amnesia**) and difficulty recalling past events (**retrograde amnesia**). Since the question asks for the "except" option, "Intact memory" is the right choice as it contradicts the core pathology of the disorder. **Analysis of incorrect options:** * **A. No disturbance of consciousness:** Unlike Delirium, patients with amnestic syndrome are alert and awake. Their level of consciousness is not clouded. * **B. Attention is intact:** Patients can usually focus on immediate tasks. The deficit is in the *encoding and retrieval* of information, not the initial registration or attention. * **C. Intact intellect:** General intelligence (IQ), reasoning, and personality remain largely preserved, distinguishing it from Dementia, where global cognitive decline occurs. **NEET-PG High-Yield Pearls:** 1. **Confabulation:** A classic feature where patients fill memory gaps with fabricated stories (common in Korsakoff’s). 2. **Neuroanatomy:** The primary lesions are found in the **mammillary bodies** and the **dorsomedial nucleus of the thalamus**. 3. **Etiology:** Most commonly due to **Thiamine (Vitamin B1) deficiency** secondary to chronic alcohol use. 4. **Differentiating Point:** Amnestic syndrome = Isolated memory loss; Dementia = Global cognitive decline; Delirium = Clouding of consciousness.
Question 319: Which of the following is a true statement regarding addictive gaming behaviour?
- A. It will come into effect from January 1, 2022. (Correct Answer)
- B. For its diagnosis, a behaviour pattern must be of sufficient severity to result in significant impairment for at least 6 months.
- C. It affects only sleep patterns and diet patterns are preserved.
- D. It shows increased physical activity.
Explanation: **Explanation:** Gaming Disorder was officially recognized as a mental health condition by the World Health Organization (WHO) in the **11th Revision of the International Classification of Diseases (ICD-11)**. While the ICD-11 was adopted in 2019, it officially came into effect for reporting and diagnostic purposes on **January 1, 2022**, making Option A the correct statement. **Analysis of Incorrect Options:** * **Option B:** For a diagnosis of Gaming Disorder, the behavioral pattern must be of sufficient severity to result in significant impairment in personal, family, social, educational, or occupational areas for at least **12 months** (not 6 months). This duration may be shortened only if symptoms are severe and all diagnostic requirements are met. * **Option C:** Addictive gaming typically leads to a neglect of basic self-care. It affects **both** sleep patterns (insomnia/delayed sleep phase) and dietary habits (skipping meals or consuming unhealthy snacks), along with a decline in personal hygiene. * **Option D:** Gaming disorder is characterized by a **sedentary lifestyle**. It shows decreased physical activity, which often leads to secondary health issues like obesity and musculoskeletal strain. **High-Yield Pearls for NEET-PG:** * **ICD-11 Definition:** Characterized by impaired control over gaming, increasing priority given to gaming over other interests, and continuation/escalation of gaming despite negative consequences. * **Comparison:** Unlike the ICD-11, the **DSM-5** (APA) lists "Internet Gaming Disorder" in the section for conditions requiring further study, rather than as a formal diagnosis. * **Key Diagnostic Feature:** The "loss of control" is the hallmark of the addiction, similar to substance use disorders.
Question 320: Paranoid schizophrenia is mimicked by the intake of which of the following substances?
- A. Amphetamine (Correct Answer)
- B. Heroin
- C. Cannabis
- D. Alcohol
Explanation: **Explanation** **Correct Answer: A. Amphetamine** Amphetamine-induced psychosis is the classic pharmacological mimic of **Paranoid Schizophrenia**. The underlying medical concept is the **Dopamine Hypothesis**: amphetamines trigger a massive release of dopamine in the mesolimbic pathway. This results in a clinical presentation characterized by clear consciousness but prominent positive symptoms, including **persecutory delusions** and **auditory/visual hallucinations**. A distinguishing feature is the presence of "formication" (the sensation of insects crawling under the skin, also known as "cocaine bugs" or Magnan’s sign). **Analysis of Incorrect Options:** * **B. Heroin:** An opioid agonist. Intoxication typically presents with euphoria, respiratory depression, and miosis (pinpoint pupils). Withdrawal causes agitation and lacrimation, but it does not mimic the structured delusional system of paranoid schizophrenia. * **C. Cannabis:** While cannabis can cause acute "Cannabis-induced Psychosis" or trigger schizophrenia in predisposed individuals, its acute intoxication is more commonly associated with conjunctival injection, increased appetite, and temporal disintegration rather than a perfect mimicry of paranoid schizophrenia. * **D. Alcohol:** Acute intoxication causes CNS depression and ataxia. While **Alcoholic Hallucinosis** exists, it occurs during withdrawal or chronic use and is usually characterized by auditory hallucinations in clear consciousness, but it lacks the specific stimulant-driven paranoid profile of amphetamines. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** The treatment for amphetamine-induced psychosis is **Antipsychotics** (e.g., Haloperidol) and Acidification of urine (to accelerate excretion). * **Differential:** Unlike schizophrenia, amphetamine psychosis usually resolves within days to weeks once the drug is cleared. * **Cocaine vs. Amphetamine:** Both can cause similar paranoid states, but amphetamine-induced psychosis typically lasts longer due to the drug's longer half-life.
Practice by Chapter
Neurobiology of Addiction
Practice Questions
Alcohol Use Disorder
Practice Questions
Opioid Use Disorder
Practice Questions
Cannabis Use Disorder
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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
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Substance Withdrawal Syndromes
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Pharmacotherapy for Substance Use Disorders
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Psychosocial Interventions
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Dual Diagnosis Management
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