Substance Use Disorders Practice Questions

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

Cannabis. ### 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).

Q: Which of the following is a symptom of opioid withdrawal?

Piloerection. 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.

Q: A patient consuming 120 ml of alcohol daily for the past 12 years is diagnosed with alcohol-dependent syndrome. Which of the following drugs should be avoided in its management?

Disulfiram. **Explanation:** The correct answer is **Disulfiram**. In the management of Alcohol Dependence Syndrome (ADS), the primary goal is to achieve abstinence or reduce craving. However, **Disulfiram** is an aversive agent that works by inhibiting the enzyme **aldehyde dehydrogenase**. This leads to the accumulation of acetaldehyde if alcohol is consumed, causing a distressing "Disulfiram-Ethanol Reaction" (nausea, tachycardia, flushing). The key clinical contraindication for Disulfiram is its use in patients who are **actively consuming alcohol** or have consumed it within the last 12–24 hours. Since the patient in the vignette is currently consuming 120 ml of alcohol daily, initiating Disulfiram would trigger a severe, potentially life-threatening reaction. It should only be started after at least 24 hours of abstinence. **Analysis of Incorrect Options:** * **Phenytoin:** While not a primary treatment for dependence, it is often used to manage alcohol-withdrawal seizures (rum fits). It is not contraindicated. * **Naltrexone:** An opioid antagonist that reduces the "reward" or euphoria associated with drinking. It can be started while the patient is still drinking to help reduce consumption. * **Acamprosate:** A NMDA antagonist/GABA agonist used to maintain abstinence. It is safe and does not cause a reaction with alcohol. **High-Yield Clinical Pearls for NEET-PG:** * **First-line for Craving:** Naltrexone (especially if there is a family history or heavy craving). * **Safe in Liver Disease:** Acamprosate (excreted renally) is preferred over Naltrexone/Disulfiram if transaminases are >3x normal. * **Disulfiram-like reaction:** Also seen with Metronidazole, Griseofulvin, and Cefotetan. * **Wernicke’s Encephalopathy:** Always give Thiamine *before* Glucose in alcoholic patients to prevent precipitating acute neurological symptoms.

Q: All of the following are used for the treatment of morphine dependence except?

Disulfiram. **Explanation:** The treatment of morphine (opioid) dependence involves managing acute withdrawal symptoms and long-term maintenance therapy to prevent relapse. **Why Disulfiram is the correct answer:** **Disulfiram** is an aldehyde dehydrogenase inhibitor used exclusively in the treatment of **Alcohol Dependence**. It creates an aversive reaction (Disulfiram-like reaction) by causing acetaldehyde accumulation if alcohol is consumed. It has no pharmacological role in the management of opioid withdrawal or dependence. **Analysis of Incorrect Options:** * **Methadone (Option A):** A long-acting μ-opioid agonist used for **opioid substitution therapy (OST)**. It prevents withdrawal symptoms and reduces "drug-seeking" behavior due to its long half-life and cross-tolerance with morphine. * **Clonidine (Option B):** An $\alpha_2$ agonist used to manage the **autonomic symptoms** of opioid withdrawal (e.g., hypertension, tachycardia, sweating, and tremors). It reduces the sympathetic overactivity caused by the locus coeruleus during detoxification. * **Naltrexone (Option C):** A long-acting **opioid antagonist** used for relapse prevention. It blocks the reinforcing effects (euphoria) of opioids. It is only started after the patient is completely detoxified to avoid precipitating acute withdrawal. **High-Yield Clinical Pearls for NEET-PG:** * **Buprenorphine:** A partial μ-agonist and κ-antagonist; it is the preferred drug for office-based opioid substitution due to its "ceiling effect" on respiratory depression. * **Naloxone:** The drug of choice for **acute opioid poisoning** (short-acting antagonist). * **Lofexidine:** An $\alpha_{2A}$ agonist recently approved specifically for managing opioid withdrawal symptoms, often preferred over clonidine due to less hypotension.

Q: Which of the following is NOT a feature of caffeine withdrawal?

Hallucinations. Caffeine is a central nervous system (CNS) stimulant that acts primarily as an **adenosine receptor antagonist**. When caffeine intake is abruptly stopped or significantly reduced in a regular user, it leads to a characteristic withdrawal syndrome. **Explanation of the Correct Answer:** * **B. Hallucinations:** Hallucinations are **not** a feature of caffeine withdrawal. Hallucinations are typically associated with withdrawal from CNS depressants (like Alcohol or Benzodiazepines) or intoxication with stimulants/hallucinogens. Caffeine withdrawal symptoms are generally non-psychotic and focus on autonomic and mood disturbances. **Explanation of Incorrect Options:** * **A. Headache:** This is the **most common** and hallmark symptom of caffeine withdrawal. It is caused by cerebral vasodilation following the removal of caffeine’s vasoconstrictive effects. * **C. Depression:** Caffeine withdrawal often manifests as dysphoric mood, irritability, or mild depressive symptoms due to the sudden drop in dopamine and norepinephrine stimulation. * **D. Weight gain:** While not the most prominent symptom, increased appetite and subsequent weight gain are recognized features of caffeine withdrawal (similar to nicotine withdrawal). **High-Yield Clinical Pearls for NEET-PG:** * **Onset:** Symptoms usually begin **12–24 hours** after the last dose. * **Peak Intensity:** Occurs at **1–2 days**. * **Duration:** Symptoms can last for **2–9 days**. * **DSM-5 Criteria:** Requires at least three of the following: Headache, fatigue/drowsiness, dysphoric mood/irritability, difficulty concentrating, and flu-like symptoms (nausea/muscle pain). * **Treatment:** Gradual tapering of caffeine intake is the preferred management strategy.

Q: A 45-year-old alcoholic male presents for deaddiction treatment. He has alcohol-induced hepatitis with other blood parameters within normal limits. Which drug should NOT be chosen for relapse prevention?

Naltrexone. **Explanation:** The core clinical challenge in this question is managing alcohol deaddiction in the presence of **liver pathology (Alcoholic Hepatitis)**. **Why Naltrexone is the correct answer:** Naltrexone is an opioid antagonist used to reduce cravings and the "reward" of drinking. However, it is primarily metabolized by the liver and is known to be **hepatotoxic**. It is strictly contraindicated in patients with acute hepatitis or liver failure. Since the patient has alcohol-induced hepatitis, Naltrexone should NOT be chosen. **Analysis of Incorrect Options:** * **Disulfiram (Option A):** While Disulfiram can be hepatotoxic in rare cases, it is not an absolute contraindication in stable hepatitis compared to Naltrexone. However, in clinical practice, it is used with caution. * **Chlordiazepoxide (Option B):** This is a long-acting benzodiazepine used for managing **acute withdrawal**, not typically for long-term relapse prevention. While it requires hepatic metabolism, it is not the primary drug for "relapse prevention" in this context. * **Acamprosate (Option D):** This is the **drug of choice** for this patient. Acamprosate is excreted unchanged by the kidneys and does not undergo hepatic metabolism, making it safe for patients with liver disease. **High-Yield Clinical Pearls for NEET-PG:** * **Safe in Liver Disease:** Acamprosate (Relapse prevention) and Lorazepam/Oxazepam (Withdrawal management—"**L**iver **O**kay"). * **Safe in Renal Failure:** Naltrexone (Avoid Acamprosate if CrCl <30 ml/min). * **Disulfiram Mechanism:** Inhibits Aldehyde Dehydrogenase, leading to accumulation of Acetaldehyde (causing the Disulfiram-Ethanol Reaction). * **Naltrexone Mechanism:** Blocks $\mu$-opioid receptors; best for reducing "heavy drinking" days.

Q: A patient with a known history of alcohol dependence develops seizures for the first time 12 to 18 hours after their last drink. The LFTs are within normal limits. What is the most appropriate pharmacological treatment for this patient?

Chlordiazepoxide. **Explanation:** The patient is presenting with **Alcohol Withdrawal Seizures** (Rum fits), which typically occur 6–48 hours after the last drink. These are usually generalized tonic-clonic seizures and occur as a result of CNS hyperexcitability due to the sudden removal of alcohol’s GABAergic inhibitory effect. **Why Chlordiazepoxide is correct:** Benzodiazepines (BZDs) are the gold standard for managing alcohol withdrawal. They show cross-tolerance with alcohol, acting on GABA-A receptors to provide a "pharmacological bridge" that prevents withdrawal symptoms and seizures. **Chlordiazepoxide** is a long-acting BZD and is the drug of choice in patients with **normal liver function** (as indicated by normal LFTs in this case) because its long half-life provides a smoother "self-tapering" effect, reducing the risk of breakthrough seizures. **Why other options are incorrect:** * **Phenytoin:** It is **ineffective** for alcohol withdrawal seizures. These seizures are metabolic/withdrawal-related, not epileptic. * **Thiamine:** While essential to prevent Wernicke’s Encephalopathy, it has no anticonvulsant properties and will not stop or prevent withdrawal seizures. * **Lorazepam:** Although a BZD, it is short-acting. It is preferred only if the patient has **liver failure** (since it undergoes direct glucuronidation) or is elderly. Since LFTs are normal here, a long-acting agent is superior. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (General):** Chlordiazepoxide or Diazepam. * **Drug of Choice (Liver Failure/Elderly):** **L**orazepam, **O**xazepam, **T**emazepam (Mnemonic: **LOT**). * **Delirium Tremens:** Occurs 48–96 hours after the last drink; characterized by autonomic instability and clouded consciousness. * **Kindling Effect:** Repeated withdrawal episodes increase the risk and severity of future seizures.

Q: Which one of the following drugs of abuse is most typically associated with the illustrated complication?

Cocaine. ***Cocaine*** - **Chronic intranasal use** causes **vasoconstriction** and **ischemic necrosis** of the nasal septum, leading to **septal perforation**. - The **midline destructive lesion** is a pathognomonic finding of chronic cocaine snorting due to its potent **local anesthetic** and **vasoconstrictive** properties. *Ketamine* - Primarily associated with **ketamine cystitis** (chronic bladder inflammation) rather than nasal complications. - Causes **urinary frequency**, **dysuria**, and **hematuria** with chronic use, not septal perforation. *Heroin* - Characteristic complications include **track marks** from intravenous use and **infective endocarditis**. - Associated with **respiratory depression**, **constipation**, and **infectious complications** rather than nasal septal damage. *Phencyclidine* - Known for causing **dissociative episodes** and **violent behavior** during intoxication. - Complications include **hyperthermia**, **hypertension**, and **psychotic episodes**, not nasal septal perforation.

Q: Withdrawal of which of the following substances causes piloerection?

Morphine. **Explanation:** The correct answer is **Morphine (Option A)**. Morphine is an opioid agonist, and the presence of **piloerection** (goosebumps) is a classic, pathognomonic sign of **opioid withdrawal**. **1. Why Morphine is Correct:** Opioid withdrawal syndrome is characterized by a "rebound" hyperactivity of the central and autonomic nervous systems. When an opioid like morphine is discontinued, the body experiences an over-excitation of the sympathetic nervous system. This leads to symptoms such as: * **Piloerection:** Historically, this gave rise to the term "cold turkey" because the skin resembles that of a plucked turkey. * **Other Autonomic Signs:** Mydriasis (dilated pupils), rhinorrhea, lacrimation, yawning, and diaphoresis. * **Gastrointestinal Distress:** Nausea, vomiting, and diarrhea. **2. Why Other Options are Incorrect:** * **Cannabis (B):** Withdrawal is generally mild, involving irritability, insomnia, and decreased appetite, but does not typically feature autonomic signs like piloerection. * **Smoking/Nicotine (C):** Withdrawal involves cravings, anxiety, and increased appetite, but lacks the severe physical autonomic discharge seen in opioids. * **Alcohol (D):** Alcohol withdrawal is life-threatening and characterized by tremors, tachycardia, seizures, and *delirium tremens*. While it involves sympathetic overactivity, piloerection is not a hallmark sign. **Clinical Pearls for NEET-PG:** * **Mydriasis vs. Miosis:** Opioid **intoxication** causes "pinpoint pupils" (miosis), whereas opioid **withdrawal** causes "blown pupils" (mydriasis). * **Severity:** While opioid withdrawal is extremely painful and distressing ("flu-like" symptoms), it is rarely life-threatening, unlike alcohol or benzodiazepine withdrawal. * **Treatment:** Acute withdrawal is managed with **Clonidine** (alpha-2 agonist to reduce sympathetic flow) or opioid substitutes like **Methadone** and **Buprenorphine**.

Question 1

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

Accepted Answer

Cannabis

Answer

Pethidine

Answer

Opium

Answer

Alcohol

Question 2

Which of the following is a symptom of opioid withdrawal?

Accepted Answer

Piloerection

Answer

Dry skin

Answer

Bradycardia

Answer

Pupillary constriction

Question 3

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?

Accepted Answer

Chlordiazepoxide

Answer

Diazepam

Answer

Carbamazepine

Answer

Morphine

Question 4

A patient consuming 120 ml of alcohol daily for the past 12 years is diagnosed with alcohol-dependent syndrome. Which of the following drugs should be avoided in its management?

Accepted Answer

Disulfiram

Answer

Phenytoin

Answer

Naltrexone

Answer

Acamprosate

Question 5

All of the following are used for the treatment of morphine dependence except?

Accepted Answer

Disulfiram

Answer

Methadone

Answer

Clonidine

Answer

Naltrexone

Question 6

Which of the following is NOT a feature of caffeine withdrawal?

Accepted Answer

Hallucinations

Answer

Headache

Answer

Depression

Answer

Weight gain

Question 7

A 45-year-old alcoholic male presents for deaddiction treatment. He has alcohol-induced hepatitis with other blood parameters within normal limits. Which drug should NOT be chosen for relapse prevention?

Accepted Answer

Naltrexone

Answer

Disulfiram

Answer

Chlordiazepoxide

Answer

Acamprosate

Question 8

A patient with a known history of alcohol dependence develops seizures for the first time 12 to 18 hours after their last drink. The LFTs are within normal limits. What is the most appropriate pharmacological treatment for this patient?

Accepted Answer

Chlordiazepoxide

Answer

Phenytoin

Answer

Thiamine

Answer

Lorazepam

Question 9

Which one of the following drugs of abuse is most typically associated with the illustrated complication?

Accepted Answer

Cocaine

Answer

Ketamine

Answer

Heroin

Answer

Phencyclidine

Question 10

Withdrawal of which of the following substances causes piloerection?

Accepted Answer

Morphine

Answer

Cannabis

Answer

Smoking

Answer

Alcohol

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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