Substance Use Disorders Practice Questions

Q: The drug acamprosate is therapeutically used for:

Maintenance therapy of alcohol abstinence. **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**.

Q: Which of the following are psychiatric complications of alcohol dependence?

Schizophrenia. **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.

Q: Which of the following is not a derivative of cannabis?

Heroin. **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.

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

Normal sensorium. ### 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.

Q: Varenicline is used in the treatment of which condition?

Nicotine addiction. **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.

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

LSD. **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).

Q: All are true about Delirium tremens except?

Severe depression. **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).

Q: Which of the following is a date rape drug?

Flunitrazepam. **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).

Question 1

The drug acamprosate is therapeutically used for:

Accepted Answer

Maintenance therapy of alcohol abstinence

Answer

Cough

Answer

Rickets

Answer

Thrombolysis

Question 2

Which of the following are psychiatric complications of alcohol dependence?

Accepted Answer

Schizophrenia

Answer

Anxiety

Answer

Suicide

Answer

Depression

Question 3

Which of the following is not a derivative of cannabis?

Accepted Answer

Heroin

Answer

Charas

Answer

Ganja

Answer

Bhang

Question 4

Cocaine abuse is most similar to which other substance abuse?

Accepted Answer

Amphetamine

Answer

Cannabis

Answer

Nicotine

Answer

Heroin

Question 5

Which of the following is not a feature of drug dependence?

Accepted Answer

Use of illegal substances

Answer

Tolerance

Answer

Persistent desire to quit the drug

Answer

Consumption of large amount of drug over prolonged period

Question 6

Which of the following is NOT a feature of Korsakoff Psychosis?

Accepted Answer

Normal sensorium

Answer

Loss of recent memory

Answer

Loss of long-term memory

Answer

Confabulation

Question 7

Varenicline is used in the treatment of which condition?

Accepted Answer

Nicotine addiction

Answer

Alcohol addiction

Answer

Heroin addiction

Answer

LSD intoxication

Question 8

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

Accepted Answer

LSD

Answer

Cannabis

Answer

Alcohol

Answer

Amphetamine

Question 9

All are true about Delirium tremens except?

Accepted Answer

Severe depression

Answer

Hallucination

Answer

Extreme anxiety

Answer

Delusion

Question 10

Which of the following is a date rape drug?

Accepted Answer

Flunitrazepam

Answer

Buprenorphine

Answer

Clonidine

Answer

Methadone

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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