Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 271: The drug acamprosate is therapeutically used for:

A. Cough
B. Rickets
C. Thrombolysis
D. Maintenance therapy of alcohol abstinence (Correct Answer)

Explanation: **Explanation:** **Acamprosate** is a pharmacological agent used primarily in the management of **Alcohol Use Disorder**. Its primary role is the **maintenance of abstinence** in patients who are already alcohol-free; it is not used for active withdrawal. **Mechanism of Action:** Chronic alcohol consumption leads to a neurochemical imbalance: inhibition of excitatory NMDA (glutamate) receptors and overstimulation of inhibitory GABA receptors. When alcohol is stopped, a "hyper-excitable" state occurs. Acamprosate acts as a **structural analogue of GABA** and a **weak NMDA receptor antagonist**. It helps "re-balance" these systems, reducing the post-withdrawal glutamate surge and decreasing the "protracted abstinence syndrome" (cravings and negative emotional states). **Analysis of Incorrect Options:** * **A. Cough:** Antitussives like Codeine or Dextromethorphan are used here. * **B. Rickets:** Treated with Vitamin D and Calcium supplementation. * **C. Thrombolysis:** Managed with agents like Alteplase, Streptokinase, or Tenecteplase. **High-Yield Clinical Pearls for NEET-PG:** * **Excretion:** Acamprosate is **excreted unchanged by the kidneys**. Therefore, it is the drug of choice for patients with **liver disease** but is **contraindicated in renal failure** (CrCl < 30 mL/min). * **Timing:** Treatment should be started as soon as possible following the period of alcohol withdrawal. * **Comparison:** Unlike Disulfiram (which causes an aversive reaction) or Naltrexone (which reduces the "reward" or "high"), Acamprosate specifically targets the **craving** associated with chronic abstinence. * **Side Effects:** The most common side effect is **diarrhea**.

Question 272: Which of the following are psychiatric complications of alcohol dependence?

A. Anxiety
B. Suicide
C. Depression
D. Schizophrenia (Correct Answer)

Explanation: **Explanation:** The question asks to identify which of the listed options is **not** typically considered a direct psychiatric complication of alcohol dependence. While alcohol use can mimic or exacerbate many conditions, **Schizophrenia (Option D)** is a primary psychotic disorder with a distinct genetic and neurodevelopmental etiology; it is not caused by alcohol dependence. **Why Schizophrenia is the Correct Choice:** Alcohol dependence can lead to "Alcohol-Induced Psychotic Disorder" (characterized by hallucinations in a clear sensorium), but it does not cause Schizophrenia. While patients with schizophrenia often have high rates of substance use (dual diagnosis), the alcohol itself is not the causative complication. **Analysis of Incorrect Options (Actual Complications):** * **Depression (Option C):** Alcohol is a potent CNS depressant. "Alcohol-induced depressive disorder" is highly common, and chronic use depletes neurotransmitters like serotonin and dopamine. * **Anxiety (Option A):** Anxiety is a hallmark of both acute intoxication and, more significantly, the withdrawal phase. Chronic use alters GABAergic and NMDA receptors, leading to rebound hyperexcitability. * **Suicide (Option B):** Alcohol dependence is one of the strongest predictors of completed suicide. It increases impulsivity, worsens underlying depression, and leads to social depletion (loss of job/family). **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Encephalopathy Triad:** Confusion, Ataxia, and Ophthalmoplegia (due to Thiamine/B1 deficiency). * **Korsakoff Psychosis:** Characterized by anterograde amnesia and **confabulation**. * **Alcoholic Hallucinosis:** Auditory hallucinations occurring in a **clear sensorium** (unlike Delirium Tremens) within 12–24 hours of abstinence. * **Marchiafava-Bignami Disease:** Rare demyelination of the corpus callosum seen in chronic alcoholics.

Question 273: Which of the following is not a derivative of cannabis?

A. Heroin (Correct Answer)
B. Charas
C. Ganja
D. Bhang

Explanation: **Explanation:** The correct answer is **Heroin (Option A)**. **1. Why Heroin is the correct answer:** Heroin (Diacetylmorphine) is a semi-synthetic **opioid**, not a cannabis derivative. It is synthesized from morphine, which is derived from the opium poppy (*Papaver somniferum*). It acts primarily on mu-opioid receptors in the central nervous system, leading to analgesia, euphoria, and respiratory depression. **2. Why the other options are incorrect:** All other options are derivatives of the plant ***Cannabis sativa*** (Indian Hemp), containing the primary psychoactive compound **Delta-9-tetrahydrocannabinol (THC)**: * **Charas (Hashish):** The resinous exudate collected from the leaves and flowering tops of the plant. It is the most potent form. * **Ganja:** Prepared from the flowering or fruiting tops of the female plant. It has intermediate potency. * **Bhang:** Prepared from the dried leaves and stems. It is the least potent form and is often consumed orally in India. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Action:** Cannabis acts on **CB1** (CNS) and **CB2** (Peripheral/Immune) receptors. * **Clinical Signs:** Conjunctival injection (red eyes), increased appetite ("munchies"), tachycardia, and dry mouth. * **Amotivational Syndrome:** A chronic effect of cannabis use characterized by apathy, lack of energy, and social withdrawal. * **Flashbacks:** Also known as Hallucinogen Persisting Perception Disorder (HPPD), these can occur with cannabis use. * **Drug Testing:** THC metabolites can be detected in the urine of chronic users for up to **30 days** due to high lipid solubility.

Question 274: Cocaine abuse is most similar to which other substance abuse?

A. Cannabis
B. Nicotine
C. Heroin
D. Amphetamine (Correct Answer)

Explanation: **Explanation:** The correct answer is **Amphetamine** because both cocaine and amphetamines belong to the class of **Psychostimulants**. They share a common mechanism of action: increasing the concentration of monoamines (primarily dopamine, norepinephrine, and serotonin) in the synaptic cleft. * **Mechanism:** While cocaine acts primarily as a **reuptake inhibitor** (blocking the dopamine transporter), amphetamines act as **releasing agents** (displacing dopamine from vesicles into the synapse). Despite this slight difference, both drugs produce nearly identical clinical effects: euphoria, increased alertness, tachycardia, pupillary dilation (mydriasis), and decreased appetite. * **Withdrawal/Toxicity:** Both substances lead to a "crash" (depression, hypersomnia, hyperphagia) during withdrawal and can cause stimulant-induced psychosis characterized by paranoid delusions and tactile hallucinations (e.g., Formication/Cocaine bugs). **Why other options are incorrect:** * **Cannabis:** A hallucinogen/depressant that typically causes conjunctival injection (red eyes), increased appetite (munchies), and relaxation, which is the opposite of the stimulant effect. * **Nicotine:** While a mild stimulant, its potency, legal status, and clinical presentation do not mirror the intense sympathomimetic surge seen with cocaine. * **Heroin:** An opioid (depressant) that causes CNS depression, respiratory depression, and **pinpoint pupils (miosis)**, directly contrasting with cocaine’s effects. **High-Yield Clinical Pearls for NEET-PG:** 1. **Formication (Magnan’s Symptom):** The sensation of insects crawling under the skin; classic in cocaine/amphetamine use. 2. **Pupillary signs:** Stimulants (Cocaine/Amphetamine) cause **Mydriasis**; Opioids (Heroin) cause **Miosis**. 3. **Treatment:** There is no specific FDA-approved pharmacological "antidote" for cocaine/amphetamine dependence; management is primarily symptomatic (e.g., Benzodiazepines for agitation).

Question 275: Which of the following is not a feature of drug dependence?

A. Tolerance
B. Persistent desire to quit the drug
C. Consumption of large amount of drug over prolonged period
D. Use of illegal substances (Correct Answer)

Explanation: The diagnosis of **Drug Dependence** (as per ICD-10) or **Substance Use Disorder** (as per DSM-5) is based on a cluster of physiological, behavioral, and cognitive phenomena. It is defined by the pattern of use and its effects on the body, not by the legal status of the substance. ### Why "Use of illegal substances" is the correct answer: The legality of a substance is a judicial classification, not a clinical one. A person can be severely dependent on **legal substances** (e.g., alcohol, tobacco, or prescribed benzodiazepines). Conversely, someone may use an illegal substance (e.g., recreational cannabis) without meeting the clinical criteria for dependence. Therefore, the legal status is irrelevant to the medical diagnosis. ### Explanation of other options (Features of Dependence): * **Tolerance (Option A):** A hallmark of dependence where increased doses are required to achieve the same effect, or there is a diminished effect with the continued use of the same amount. * **Persistent desire to quit (Option B):** This reflects the "loss of control." Patients often have a subjective awareness of the harm and make unsuccessful efforts to cut down or control substance use. * **Consumption of large amounts (Option C):** This indicates a pattern of use where the substance is taken in larger amounts or over a longer period than was originally intended. ### High-Yield Clinical Pearls for NEET-PG: * **ICD-10 Criteria:** Diagnosis of dependence requires **3 or more** of the following features present together at some time during the previous year: 1. Strong desire/compulsion (Craving). 2. Difficulties in controlling onset, termination, or levels of use. 3. Physiological withdrawal state. 4. Evidence of tolerance. 5. Progressive neglect of alternative pleasures or interests. 6. Persisting with use despite clear evidence of harmful consequences. * **DSM-5 Update:** The DSM-5 has combined "Abuse" and "Dependence" into a single spectrum called **Substance Use Disorder (SUD)**. * **Craving** is the most important subjective feature of dependence.

Question 276: Which of the following is NOT a feature of Korsakoff Psychosis?

A. Normal sensorium (Correct Answer)
B. Loss of recent memory
C. Loss of long-term memory
D. Confabulation

Explanation: ### Explanation Korsakoff Psychosis (also known as Korsakoff Syndrome) is a chronic neuropsychiatric condition resulting from severe **Thiamine (Vitamin B1) deficiency**, most commonly seen in chronic alcoholics. It often follows an untreated episode of Wernicke’s Encephalopathy. **Why "Normal Sensorium" is the Correct Answer:** In Korsakoff Psychosis, the patient is **alert and conscious** with a clear sensorium. This is a hallmark feature that distinguishes it from Wernicke’s Encephalopathy (where consciousness is clouded) and Delirium. Because the sensorium is normal, the correct answer to "which is NOT a feature" is **Normal Sensorium** (as it is a characteristic, not a deficit). *Note: In many MCQ formats, this question is framed to highlight that consciousness is preserved despite profound memory deficits.* **Analysis of Other Options:** * **Loss of Recent Memory (Anterograde Amnesia):** This is the core feature. Patients cannot form new memories or retain information for more than a few minutes. * **Loss of Long-term Memory (Retrograde Amnesia):** While recent memory is more severely affected, there is often a significant loss of past memories (retrograde amnesia), though very remote memories may remain intact. * **Confabulation:** This is a classic compensatory mechanism where the patient "fills in" memory gaps with fabricated or distorted stories, believing them to be true. **Clinical Pearls for NEET-PG:** * **Wernicke-Korsakoff Syndrome:** Wernicke is the *acute* phase (Triad: Ataxia, Ophthalmoplegia, Confusion); Korsakoff is the *chronic* phase (Amnesia + Confabulation). * **Anatomical Site:** The **Mammillary bodies** and the **Dorsomedial nucleus of the Thalamus** are the primary areas of brain damage. * **Treatment:** High-dose Thiamine. Always give Thiamine **before** Glucose in a suspected alcoholic to prevent precipitating Wernicke’s.

Question 277: Varenicline is used in the treatment of which condition?

A. Nicotine addiction (Correct Answer)
B. Alcohol addiction
C. Heroin addiction
D. LSD intoxication

Explanation: **Explanation:** **Varenicline** is a first-line pharmacotherapy for smoking cessation. Its mechanism of action is as a **selective partial agonist at the $\alpha_4\beta_2$ nicotinic acetylcholine receptors (nAChR)** in the brain. * **Why it works:** As a *partial agonist*, it provides a dual benefit: 1. **Agonist effect:** It stimulates the receptor enough to release low levels of dopamine, which helps reduce nicotine cravings and withdrawal symptoms. 2. **Antagonist effect:** It competitively inhibits nicotine from binding to the receptor. If a patient smokes while on Varenicline, they do not experience the typical "reward" or "buzz," leading to extinction of the habit. **Analysis of Incorrect Options:** * **Alcohol addiction:** Managed with Disulfiram (aversion therapy), Acamprosate (NMDA modulator), or Naltrexone (opioid antagonist). * **Heroin addiction:** Acute overdose is treated with Naloxone; long-term maintenance involves Methadone (full agonist) or Buprenorphine (partial agonist). * **LSD intoxication:** Primarily managed with supportive care and benzodiazepines for agitation; there is no specific pharmacological "anti-LSD" agent like Varenicline. **High-Yield Clinical Pearls for NEET-PG:** * **Side Effects:** The most common side effect is **nausea**. However, the most high-yield psychiatric side effect is the potential for **neuropsychiatric symptoms** (suicidal ideation, depression, and vivid dreams/nightmares). * **Excretion:** It is primarily excreted by the kidneys; dose adjustment is required in renal failure. * **Comparison:** Unlike Bupropion (another smoking cessation aid), Varenicline does not significantly lower the seizure threshold.

Question 278: Treatment is not required in the withdrawal of which of the following substances?

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

Explanation: **Explanation:** The correct answer is **LSD (Lysergic acid diethylamide)**. The fundamental medical concept here is the distinction between substances that produce physical dependence versus those that do not. **LSD** is a potent hallucinogen that acts primarily on 5-HT2A receptors. While it produces significant psychological effects and rapid tolerance, it **does not cause physical dependence**. Consequently, there is no clinically recognized withdrawal syndrome associated with the cessation of LSD use. Therefore, no pharmacological treatment for withdrawal is required. **Analysis of Incorrect Options:** * **Cannabis:** Chronic use leads to a withdrawal syndrome characterized by irritability, insomnia, decreased appetite, and anxiety. While often mild, severe cases may require supportive care or symptomatic treatment (e.g., benzodiazepines for anxiety). * **Alcohol:** Alcohol withdrawal is a medical emergency. It can lead to life-threatening conditions like **Delirium Tremens** and seizures. Treatment with Benzodiazepines (Chlordiazepoxide or Diazepam) is mandatory to prevent mortality. * **Amphetamine:** Withdrawal (the "crash") involves profound depression, fatigue, and vivid unpleasant dreams. While not usually life-threatening, it often requires supportive care and monitoring for suicidal ideation. **Clinical Pearls for NEET-PG:** * **Hallucinogens (LSD, Psilocybin):** No withdrawal syndrome, but can cause **HPPD** (Hallucinogen Persisting Perception Disorder) or "flashbacks." * **Cocaine/Amphetamines:** Withdrawal is primarily psychological (dysphoria, cravings) rather than physical. * **Opioids/Alcohol/Benzodiazepines:** These have the most severe physical withdrawal symptoms. * **Phencyclidine (PCP):** Unlike LSD, PCP intoxication often requires aggressive management due to violent behavior and nystagmus (vertical/rotatory).

Question 279: All are true about Delirium tremens except?

A. Severe depression (Correct Answer)
B. Hallucination
C. Extreme anxiety
D. Delusion

Explanation: **Explanation:** **Delirium Tremens (DTs)** is the most severe form of alcohol withdrawal, typically occurring 48–92 hours after the last drink. It is characterized by a state of **clouded consciousness** and **autonomic hyperactivity**. **Why "Severe Depression" is the correct answer (The Exception):** While alcohol is a CNS depressant, the withdrawal syndrome is characterized by **CNS hyperexcitability** (due to GABA underactivity and NMDA overactivity). Patients in DTs present with agitation, tremors, and sympathetic overdrive (tachycardia, hypertension, diaphoresis), rather than the psychomotor retardation or low mood associated with clinical depression. While a patient may feel dysphoric, "Severe Depression" is not a diagnostic feature or a hallmark of DTs. **Analysis of Incorrect Options:** * **Hallucinations:** These are a hallmark of DTs, most commonly **visual** (e.g., seeing insects or small animals—microzoopsia) or tactile (formication). * **Extreme Anxiety:** Autonomic arousal leads to intense psychomotor agitation, panic, and severe anxiety. * **Delusion:** Patients often experience paranoid delusions, frequently secondary to their hallucinations or disorientation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Timeline:** DTs occur 2–4 days after cessation; Alcohol Hallucinosis occurs 12–24 hours (with clear sensorium). 2. **Mortality:** If untreated, DTs have a mortality rate of up to 5%–20% (usually due to arrhythmias or hyperthermia). 3. **Drug of Choice:** **Benzodiazepines** (Chlordiazepoxide or Diazepam) are the gold standard. In patients with liver failure, use **LOT** (Lorazepam, Oxazepam, Temazepam). 4. **Key Sign:** The most important diagnostic feature is **clouding of consciousness** (disorientation).

Question 280: Which of the following is a date rape drug?

A. Flunitrazepam (Correct Answer)
B. Buprenorphine
C. Clonidine
D. Methadone

Explanation: **Explanation:** **Flunitrazepam (Option A)** is a potent benzodiazepine commonly known by its trade name, **Rohypnol** (street name: "Roofies"). It is classified as a "date rape drug" because it is colorless, odorless, and tasteless when dissolved in beverages. Pharmacologically, it induces profound sedation, muscle relaxation, and **anterograde amnesia**. These properties render a victim incapacitated and unable to recall the events of an assault, making it a classic agent of drug-facilitated sexual assault (DFSA). **Why the other options are incorrect:** * **Buprenorphine (Option B):** A partial mu-opioid agonist used primarily in the treatment of opioid use disorder (maintenance therapy) and severe pain. It does not typically cause the rapid incapacitation associated with date rape. * **Clonidine (Option C):** An alpha-2 adrenergic agonist used for hypertension and managing opioid withdrawal symptoms. While it causes sedation, it is not used as a predatory agent. * **Methadone (Option D):** A long-acting full mu-opioid agonist used for opioid detoxification and maintenance. Its slow onset of action makes it unsuitable for immediate incapacitation. **High-Yield Clinical Pearls for NEET-PG:** * **Other Date Rape Drugs:** Apart from Flunitrazepam, other common agents include **GHB (Gamma-hydroxybutyrate)** and **Ketamine**. * **Mechanism:** Like other benzodiazepines, Flunitrazepam acts by enhancing the effect of **GABA** at the $GABA_A$ receptor, increasing chloride channel opening frequency. * **Detection:** Modern formulations of Rohypnol are manufactured with a **blue dye** that appears when dissolved in clear liquids to help prevent covert administration. * **Management:** In cases of acute benzodiazepine overdose, the specific antidote is **Flumazenil** (a competitive GABA antagonist).

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

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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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