Substance Use Disorders Practice Questions

Q: At what dose of alcohol intoxication are alcoholic blackouts typically observed?

200-300 mg/dl. **Explanation:** **Alcoholic blackouts** are episodes of anterograde amnesia where an individual remains conscious and functional but cannot form new long-term memories. This occurs due to the acute inhibition of the **hippocampus**, specifically interfering with long-term potentiation (LTP). **Why Option D is Correct:** Blackouts typically occur when Blood Alcohol Concentration (BAC) rises rapidly, usually reaching levels of **200–300 mg/dl**. At this high concentration, the neurochemical disruption in the brain is severe enough to "switch off" the recording of memories while sparing basic motor functions and consciousness. **Analysis of Incorrect Options:** * **A (20-30 mg/dl):** This is a very low level. At this stage, an individual might experience mild relaxation or slight changes in mood, but cognitive functions remain intact. * **B (30-80 mg/dl):** This level causes mild impairment in coordination and reaction time. In many countries, 80 mg/dl is the legal limit for driving. * **C (80-200 mg/dl):** This range is associated with significant intoxication, slurred speech, and ataxia (drunkenness), but it is generally below the threshold for complete memory "blackouts." **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Alcohol antagonizes **NMDA receptors** and enhances **GABA receptors** in the hippocampus, blocking memory consolidation. * **Types of Blackouts:** 1. **En bloc:** Total permanent amnesia for a period. 2. **Fragmentary (Brownouts):** Partial memory loss where cues can help recall. * **Lethal Dose:** Respiratory depression and death typically occur at BAC levels >400–500 mg/dl. * **Wernicke-Korsakoff Syndrome:** While blackouts are acute, chronic memory loss in alcoholics is due to Thiamine (B1) deficiency.

Q: All of the following are relatively normal in Korsakoff's psychosis except:

Learning. **Explanation:** Korsakoff’s Psychosis (often part of the Wernicke-Korsakoff syndrome) is characterized by a profound **anterograde amnesia** caused by thiamine (Vitamin B1) deficiency, typically due to chronic alcohol abuse. **Why "Learning" is the correct answer:** The hallmark of Korsakoff’s syndrome is the inability to form new memories (anterograde amnesia). **Learning** is essentially the process of acquiring and encoding new information into long-term memory. Because the damage occurs in the diencephalon (mammillary bodies and dorsomedial nucleus of the thalamus), patients cannot "learn" or retain new facts or events, making this the most abnormal function among the choices. **Analysis of incorrect options:** * **A. Implicit memory:** This remains relatively **preserved**. Patients can often learn new motor skills or procedural tasks (e.g., mirror drawing) even if they have no conscious (explicit) memory of having practiced them. * **B. Intelligence:** General cognitive functions, reasoning, and IQ scores often remain within the **normal** range. The deficit is specific to memory rather than global intellectual decline (unlike Dementia). * **C. Language:** Basic linguistic abilities, vocabulary, and syntax are typically **spared**. Patients can converse normally, although they may use **confabulation** (filling memory gaps with fabricated stories) to hide their memory deficits. **High-Yield Clinical Pearls for NEET-PG:** * **Neuroanatomy:** Most common site of lesion is the **Mammillary bodies**. * **Clinical Tetrad:** Amnesia (Anterograde > Retrograde), Confabulation, Lack of insight, and Apathy. * **Confabulation:** A characteristic feature where the patient provides false information without the intent to deceive. * **Treatment:** High-dose parenteral **Thiamine**. Always give thiamine *before* glucose to avoid precipitating Wernicke’s encephalopathy.

Q: All of the following are seen in nicotine withdrawal except?

Hyperhidrosis. **Explanation:** Nicotine is a potent stimulant that acts on nicotinic acetylcholine receptors, leading to the release of dopamine, norepinephrine, and acetylcholine. When a chronic user stops smoking, the central nervous system undergoes a "rebound" effect. **Why Hyperhidrosis is the correct answer:** Hyperhidrosis (excessive sweating) is a sign of **sympathetic overactivity**, which is characteristic of withdrawal from CNS depressants like alcohol or opioids. In contrast, nicotine withdrawal is primarily characterized by irritability, decreased heart rate, and increased appetite. Hyperhidrosis is **not** a diagnostic criterion for nicotine withdrawal according to the DSM-5 or ICD-11. **Analysis of incorrect options:** * **Anxiety (B):** This is one of the most common psychological symptoms of nicotine withdrawal, often accompanied by irritability, frustration, and restlessness. * **Bradycardia (C):** Nicotine is a stimulant that increases heart rate. Upon cessation, there is a physiological "crash," leading to a **decrease in heart rate** (bradycardia). This is a high-yield distinction from most other withdrawal syndromes. * **Insomnia (D):** Sleep disturbances, including difficulty falling asleep and fragmented sleep, are classic features of the withdrawal syndrome. **Clinical Pearls for NEET-PG:** * **Weight Gain:** Nicotine withdrawal typically causes increased appetite and weight gain (due to decreased metabolic rate and oral substitution). * **Timeline:** Symptoms peak within 24–48 hours and usually subside within 3–4 weeks. * **First-line Treatment:** Nicotine Replacement Therapy (NRT), Varenicline (partial agonist), and Bupropion (atypical antidepressant). * **Key Distinguisher:** Unlike alcohol or opioid withdrawal, nicotine withdrawal is **not** life-threatening.

Q: Which of the following is NOT a symptom of opioid withdrawal?

Constipation. **Explanation:** The clinical presentation of opioid withdrawal is essentially the "physiological opposite" of opioid intoxication. Opioids are CNS depressants that slow down bodily functions, leading to miosis, sedation, and decreased gastrointestinal motility. When the drug is withdrawn, the body enters a state of autonomic hyperactivity. **Why Constipation is the Correct Answer:** Constipation is a classic side effect of **opioid use/intoxication** (due to the activation of mu-receptors in the myenteric plexus). During **withdrawal**, the rebound effect leads to increased gastrointestinal motility, resulting in **diarrhea** and abdominal cramps, not constipation. **Analysis of Incorrect Options:** * **Insomnia:** Withdrawal causes CNS hyperarousal, leading to significant restlessness and inability to sleep. * **Piloerection:** This is a pathognomonic sign of severe opioid withdrawal (often called "cold turkey"). It occurs due to autonomic instability. * **Rhinorrhea:** Increased lacrimation (tearing) and rhinorrhea (runny nose) are early signs of the flu-like syndrome characteristic of opioid withdrawal. **High-Yield Clinical Pearls for NEET-PG:** * **The "Wet" Withdrawal:** Remember that opioid withdrawal is "wet"—expect diarrhea, rhinorrhea, lacrimation, and sweating (diaphoresis). * **Pupils:** While intoxication causes "pinpoint pupils" (miosis), withdrawal causes **mydriasis** (dilation). * **Yawning:** Frequent yawning is a highly specific early sign of opioid withdrawal often tested in exams. * **Severity:** Although extremely distressing ("bone-breaking" pain), opioid withdrawal is generally **not life-threatening**, unlike alcohol or benzodiazepine withdrawal. * **Treatment:** Clonidine (alpha-2 agonist) is used to manage autonomic symptoms; Methadone or Buprenorphine are used for long-term detoxification.

Q: Which of the following is an anti-smoking drug?

Bupropion. **Explanation:** **Bupropion** (specifically the sustained-release formulation) is an atypical antidepressant that is FDA-approved as a first-line pharmacological treatment for smoking cessation. **Mechanism of Action:** It acts as a selective **Norepinephrine and Dopamine Reuptake Inhibitor (NDRI)**. By increasing dopamine levels in the nucleus accumbens (the brain's reward center), it mimics the rewarding effect of nicotine, thereby reducing withdrawal symptoms and the urge to smoke. It also acts as a non-competitive antagonist at nicotinic acetylcholine receptors. **Analysis of Incorrect Options:** * **A. Theophylline:** A methylxanthine bronchodilator used in asthma and COPD. It has a narrow therapeutic index and is not used for addiction. * **B. Bicalutamide:** An oral non-steroidal anti-androgen used primarily in the treatment of prostate cancer. * **C. Salmeterol:** A Long-Acting Beta-2 Agonist (LABA) used for the maintenance treatment of asthma and COPD; it has no role in nicotine addiction. **High-Yield Clinical Pearls for NEET-PG:** * **Varenicline** (a partial agonist at $\alpha4\beta2$ nicotinic receptors) is considered the most effective monotherapy for smoking cessation. * **Contraindication:** Bupropion is strictly contraindicated in patients with a **history of seizures** or **eating disorders** (bulimia/anorexia), as it lowers the seizure threshold. * **Weight Gain:** Bupropion is often preferred for smokers concerned about post-cessation weight gain, as it tends to delay this effect. * **Clonidine and Nortriptyline** are considered second-line agents for smoking cessation.

Q: Which of the following drugs is recently used in patients with alcohol dependence?

Naltrexone. **Explanation:** **Naltrexone** is an opioid receptor antagonist (primarily acting on $\mu$-receptors) that has become a cornerstone in the pharmacological management of alcohol dependence. The underlying medical concept is the **blockade of the endogenous opioid system**. When alcohol is consumed, it triggers the release of endogenous opioids in the ventral tegmental area, which mediates the "reward" or "high." By blocking these receptors, Naltrexone reduces the reinforcing effects of alcohol and significantly decreases **craving**, helping to prevent relapse. **Analysis of Incorrect Options:** * **Gabapentin (Option C):** While some recent studies suggest Gabapentin may help maintain abstinence or reduce heavy drinking, it is considered a second-line or "off-label" treatment. It is not the primary "gold standard" recently emphasized in standard textbooks compared to Naltrexone. * **Tiagabine (Option A) and Lamotrigine (Option D):** These are anticonvulsants. While they modulate GABA and Glutamate respectively, they do not have established clinical efficacy or FDA approval for treating alcohol dependence. **High-Yield Clinical Pearls for NEET-PG:** * **Naltrexone Requirement:** The patient must be opioid-free for at least 7–10 days before starting Naltrexone to avoid precipitating acute withdrawal. * **Acamprosate:** Another first-line agent (NMDA antagonist); it is preferred in patients with **liver disease**, whereas Naltrexone is preferred in patients still drinking (to reduce heavy drinking days). * **Disulfiram:** An aldehyde dehydrogenase inhibitor; it works via **aversion therapy** (causing a toxic reaction if alcohol is consumed) rather than reducing craving. * **Varenicline:** Primarily for smoking cessation, but also shows promise in reducing alcohol consumption.

Q: A male started consuming alcohol at 20 years of age and has been taking 3 quarters daily for the past 30 years. He now reports that he experiences the desired effect with only 1 quarter. What is the diagnosis?

Reverse tolerance. ### Explanation **Correct Answer: C. Reverse tolerance** **Why it is correct:** Tolerance is defined as the need for increased amounts of a substance to achieve intoxication or the desired effect. However, in chronic, heavy alcohol users (like this patient with a 30-year history), the liver eventually suffers significant damage (cirrhosis or alcoholic hepatitis). This leads to a **decline in the liver's metabolic capacity** to break down alcohol. Consequently, even small amounts of alcohol remain in the bloodstream for longer periods, producing the desired effect or intoxication. This phenomenon, where a lower dose is required to produce the same effect previously achieved with higher doses, is known as **Reverse Tolerance**. **Why other options are incorrect:** * **Withdrawal:** Refers to the physical and psychological symptoms (e.g., tremors, seizures, delirium tremens) that occur when a person stops or reduces heavy alcohol intake. * **Mellanby Phenomenon:** This describes the observation that the effects of alcohol are more pronounced when blood alcohol levels are **rising** than when they are falling, even if the concentration is the same at both points. * **Cross Tolerance:** This occurs when tolerance to one drug (e.g., alcohol) leads to tolerance to another drug in the same class (e.g., benzodiazepines or barbiturates) due to similar mechanisms of action. **Clinical Pearls for NEET-PG:** * **Tolerance** is a hallmark of the "Dependence Syndrome" (ICD-10). * **Reverse tolerance** is specifically associated with **end-stage liver disease** in chronic alcoholics. * Remember the **CAGE questionnaire** for screening: **C**ut down, **A**nnoyed, **G**uilty, **E**ye-opener. * Alcohol metabolism follows **Zero-order kinetics** (a constant amount is eliminated per unit time, regardless of concentration).

Q: Which of the following drugs is NOT used in the management of opioid dependence?

Disulfiram. **Explanation:** The management of opioid dependence involves two phases: **detoxification** (managing withdrawal) and **maintenance/relapse prevention**. **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-ethanol reaction) by causing acetaldehyde accumulation. It has no pharmacological role in modulating opioid receptors or managing opioid withdrawal symptoms. **Analysis of other options:** * **Clonidine:** An alpha-2 adrenergic agonist used to manage the **autonomic symptoms** of opioid withdrawal (e.g., tachycardia, hypertension, sweating, and restlessness). It is a non-opioid alternative for detoxification. * **Lorazepam:** A benzodiazepine used as supportive therapy during opioid withdrawal to manage **insomnia, anxiety, and muscle cramps**. * **Naltrexone:** A long-acting **opioid antagonist** used for **relapse prevention** (maintenance phase). It blocks the euphoric effects of opioids if the patient slips. It must only be started after the patient is opioid-free for 7–10 days to avoid precipitating acute withdrawal. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Maintenance:** Methadone (Full agonist) or Buprenorphine (Partial agonist). * **Acute Opioid Overdose:** Naloxone (Short-acting antagonist) is the drug of choice. * **Precipitated Withdrawal:** Occurs if Naltrexone or Naloxone is given while opioids are still in the system. * **Disulfiram-like reaction:** Can be caused by drugs like Metronidazole, Cefotetan, and Sulfonylureas when taken with alcohol.

Q: The following symptoms may be seen in opium withdrawal:

Constipation. **Explanation:** Opioid withdrawal syndrome is characterized by a "rebound" effect of the sympathetic nervous system and the gastrointestinal tract, essentially presenting as the physiological opposite of acute opioid effects. **1. Why the Correct Answer is Right:** Opioids are notorious for causing **constipation** by decreasing intestinal motility and increasing sphincter tone. During withdrawal, the body experiences a rebound increase in peristalsis, leading to **diarrhea**, abdominal cramps, and hyperactive bowel sounds. Therefore, constipation is a feature of opioid *use/intoxication*, not withdrawal. *(Note: In the provided options, "Constipation" is marked as the correct answer, likely implying it is the "except" or "not seen" feature in a typical "all are seen except" question format common in NEET-PG.)* **2. Analysis of Other Options:** * **Lacrimation (Option B):** This is a classic early sign of opioid withdrawal. It occurs due to autonomic hyperactivity. * **Dry nose and mouth (Option C):** This is incorrect in the context of withdrawal. Withdrawal actually causes **rhinorrhea** (runny nose) and excessive salivation/sweating (wet symptoms). * **Option D:** Repeated as constipation. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Wet" Syndrome:** Remember opioid withdrawal as a "leaky" state—Lacrimation, Rhinorrhea, Diarrhea, Sweating (Diaphoresis), and Salivation. * **Mydriasis:** While opioids cause "pinpoint pupils" (Miosis), withdrawal causes **Mydriasis** (dilated pupils). * **Piloerection:** The appearance of "goosebumps" (cold turkey) is a highly specific sign of severe opioid withdrawal. * **Management:** **Clonidine** (alpha-2 agonist) is used to suppress autonomic overactivity; **Methadone** or **Buprenorphine** are used for substitution therapy. * **Vital Signs:** Look for tachycardia, hypertension, and insomnia in clinical vignettes.

Question 1

At what dose of alcohol intoxication are alcoholic blackouts typically observed?

Accepted Answer

200-300 mg/dl

Answer

20-30 mg/dl

Answer

30-80 mg/dl

Answer

80-200 mg/dl

Question 2

All of the following are relatively normal in Korsakoff's psychosis except:

Accepted Answer

Learning

Answer

Implicit memory

Answer

Intelligence

Answer

Language

Question 3

All of the following are seen in nicotine withdrawal except?

Accepted Answer

Hyperhidrosis

Answer

Anxiety

Answer

Bradycardia

Answer

Insomnia

Question 4

Which of the following is NOT a symptom of opioid withdrawal?

Accepted Answer

Constipation

Answer

Insomnia

Answer

Piloerection

Answer

Rhinorrhea

Question 5

Which of the following is an anti-smoking drug?

Accepted Answer

Bupropion

Answer

Theophylline

Answer

Biclutamide

Answer

Salmeterol

Question 6

Which of the following drugs is recently used in patients with alcohol dependence?

Accepted Answer

Naltrexone

Answer

Tiagabine

Answer

Gabapentin

Answer

Lamotrigine

Question 7

A male started consuming alcohol at 20 years of age and has been taking 3 quarters daily for the past 30 years. He now reports that he experiences the desired effect with only 1 quarter. What is the diagnosis?

Accepted Answer

Reverse tolerance

Answer

Withdrawal

Answer

Mellanby phenomenon

Answer

Cross tolerance

Question 8

Diagnosis of Alcohol Dependence includes all of the following, EXCEPT?

Accepted Answer

Lack of tolerance for alcohol

Answer

Impaired occupational and social functioning

Answer

The need for daily drinking to function adequately

Answer

Inability to cut down or stop drinking

Question 9

Which of the following drugs is NOT used in the management of opioid dependence?

Accepted Answer

Disulfiram

Answer

Clonidine

Answer

Lorazepam

Answer

Naltrexone

Question 10

The following symptoms may be seen in opium withdrawal:

Accepted Answer

Constipation

Answer

Lacrimation

Answer

Dry nose and mouth

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

On this page

Practice by Chapter

Want unlimited practice?