Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 171: Which of the following is NOT a symptom of opioid withdrawal?

A. Insomnia
B. Piloerection
C. Rhinorrhea
D. Constipation (Correct Answer)

Explanation: **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 When the drug is withdrawn, the body enters a state of autonomic hyperactivity.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.

Question 172: Which of the following is NOT a feature of caffeine withdrawal?

A. Depression
B. Headache
C. Tachycardia (Correct Answer)
D. Anxiety

Explanation: **Explanation:** Caffeine is a central nervous system (CNS) stimulant that acts primarily as an **adenosine receptor antagonist**. Regular consumption leads to up-regulation of adenosine receptors. When caffeine intake is abruptly stopped, the increased sensitivity to adenosine results in CNS depression and peripheral vasodilation. **Why Tachycardia is the Correct Answer:** Tachycardia (increased heart rate) is a feature of **caffeine intoxication**, not withdrawal. During withdrawal, the body experiences a "rebound" effect characterized by **bradycardia** (decreased heart rate) and peripheral vasodilation. Therefore, tachycardia is the odd one out. **Analysis of Incorrect Options:** * **Headache:** This is the **most common** and hallmark symptom of caffeine withdrawal. It is caused by rebound cerebral vasodilation after the vasoconstrictive effects of caffeine wear off. * **Depression & Anxiety:** Caffeine withdrawal typically presents with dysphoric mood changes. Patients often experience irritability, anxiety, and a depressed mood (depressive symptoms) as the stimulant effect is removed. **NEET-PG High-Yield Pearls:** 1. **Timeline:** Withdrawal symptoms typically begin 12–24 hours after the last dose, peak at 1–2 days, and can last up to a week. 2. **Diagnostic Criteria:** According to DSM-5, caffeine withdrawal requires the abrupt cessation of daily use followed by 3 or more symptoms (Headache, Fatigue, Depressed mood/Irritability, Difficulty concentrating, and Flu-like symptoms). 3. **Mechanism:** Caffeine inhibits the enzyme **phosphodiesterase**, leading to increased levels of cAMP, which mediates its stimulant effects.

Question 173: What is the primary pharmacological treatment for opiate withdrawal?

A. Chlorpromazine
B. Nalorphine
C. Pethidine
D. Methadone (Correct Answer)

Explanation: **Explanation:** The primary goal in managing opiate withdrawal is to alleviate distressing symptoms and prevent relapse by using a long-acting opioid agonist. **Why Methadone is Correct:** **Methadone** is a long-acting synthetic **mu-opioid receptor agonist**. In the context of withdrawal, it is used for "substitution therapy." Because it has a long half-life (24–36 hours), it provides a stable blood level that prevents withdrawal symptoms and reduces drug craving without producing the intense euphoria associated with shorter-acting opioids like heroin. This allows for a controlled, gradual tapering of the dose. **Analysis of Incorrect Options:** * **Chlorpromazine (A):** This is a typical antipsychotic. While it may provide sedation, it does not address the underlying neurochemical deficiency of the opioid receptors and is not a standard treatment for withdrawal. * **Nalorphine (B):** This is a mixed agonist-antagonist. Administering an antagonist to a person dependent on opioids will **precipitate** acute, severe withdrawal rather than treat it. * **Pethidine (C):** This is a short-acting synthetic opioid. Using a short-acting opioid to treat withdrawal is counterproductive as it maintains the cycle of rapid "highs" and "crashes," leading to poor stabilization. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** Methadone and **Buprenorphine** (a partial mu-agonist) are the first-line agents for detoxification and maintenance. * **Clonidine:** An alpha-2 agonist used to treat the *autonomic* symptoms of withdrawal (tachycardia, hypertension, sweating) but does not help with cravings. * **Objective Sign:** **Mydriasis** (pupillary dilation) is a hallmark sign of opioid withdrawal (opposite of the "pinpoint pupils" seen in intoxication). * **Severity Scale:** The **COWS** (Clinical Opiate Withdrawal Scale) is used to monitor the severity of symptoms.

Question 174: Which of the following is an anti-smoking drug?

A. Theophylline
B. Biclutamide
C. Salmeterol
D. Bupropion (Correct Answer)

Explanation: **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.

Question 175: Which of the following drugs is recently used in patients with alcohol dependence?

A. Tiagabine
B. Naltrexone (Correct Answer)
C. Gabapentin
D. Lamotrigine

Explanation: **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.

Question 176: Which of the following is true regarding Korsakoff syndrome?

A. Can be seen in chronic alcoholics
B. Absence of intellectual decline
C. Chronic amnestic syndrome
D. All of the above (Correct Answer)

Explanation: **Explanation:** Korsakoff Syndrome is a chronic neuropsychiatric disorder caused by a severe deficiency of **Thiamine (Vitamin B1)**, most commonly secondary to **chronic alcohol consumption**. It often follows an untreated or inadequately treated episode of Wernicke Encephalopathy (together known as Wernicke-Korsakoff Syndrome). **Breakdown of Options:** * **Option A (Chronic Alcoholics):** Alcoholism is the leading cause of thiamine deficiency due to poor dietary intake, impaired gastrointestinal absorption, and reduced hepatic storage of the vitamin. * **Option B (Absence of intellectual decline):** A hallmark of Korsakoff syndrome is that while memory is profoundly impaired, other cognitive functions (such as IQ, language, and sensorimotor skills) remain relatively **preserved**. This distinguishes it from global dementia. * **Option C (Chronic amnestic syndrome):** It is characterized by a "disproportionate" memory loss. Specifically, patients exhibit **anterograde amnesia** (inability to form new memories) and **retrograde amnesia**, often accompanied by **confabulation** (filling memory gaps with fabricated stories). **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by lesions in the **mammillary bodies**, dorsomedial nucleus of the thalamus, and periaqueductal gray matter. * **Confabulation:** This is a classic feature where the patient provides false information without the intent to deceive. * **Treatment:** While Wernicke Encephalopathy is reversible with Thiamine, Korsakoff Syndrome is often **irreversible** or only partially reversible. * **Rule of Thumb:** Always administer Thiamine **before** Glucose in a malnourished patient to prevent precipitating Wernicke’s.

Question 177: What is the drug of choice for managing alcohol withdrawal?

A. Benzodiazepine
B. Chlordiazepoxide (Correct Answer)
C. Lithium
D. Haloperidol

Explanation: **Explanation:** The management of alcohol withdrawal focuses on preventing life-threatening complications like seizures and delirium tremens. **Why Chlordiazepoxide is the Correct Answer:** Alcohol acts as a CNS depressant by enhancing GABAergic tone. Chronic use leads to downregulation of GABA receptors; sudden cessation results in CNS hyperexcitability. **Benzodiazepines (BZDs)** are the gold standard for treatment because they show **cross-tolerance** with alcohol, substituting for its effects and tapering the withdrawal symptoms safely. While "Benzodiazepine" is a class (Option A), **Chlordiazepoxide** (Option B) is the specific drug of choice (DOC) because it is a long-acting BZD. Its long half-life ensures a "self-tapering" effect, providing a smoother detoxification process with a lower risk of breakthrough seizures. **Analysis of Other Options:** * **A. Benzodiazepine:** While correct as a class, Chlordiazepoxide is the more specific and preferred clinical answer in this context. * **C. Lithium:** Used for Bipolar Disorder; it has no role in alcohol withdrawal and can lower the seizure threshold. * **D. Haloperidol:** An antipsychotic used only as an adjunct for severe agitation or hallucinations. It should never be used alone as it lowers the seizure threshold. **High-Yield Clinical Pearls for NEET-PG:** * **Liver Disease:** If the patient has cirrhosis or liver failure, use **LOT** (Lorazepam, Oxazepam, Temazepam) as they undergo extrahepatic metabolism. * **Delirium Tremens:** Occurs 48–96 hours after the last drink; characterized by autonomic instability and clouded consciousness. * **Wernicke’s Encephalopathy:** Always give **Thiamine before Glucose** to prevent precipitating this condition.

Question 178: The AUDIT questionnaire is used for the detection of which condition?

A. Schizophrenia
B. Opioid addiction
C. Depression
D. Alcoholism (Correct Answer)

Explanation: **Explanation:** The **AUDIT (Alcohol Use Disorders Identification Test)** is a 10-item screening tool developed by the World Health Organization (WHO) to detect excessive drinking and help identify individuals with alcohol use disorders (alcoholism). It assesses three domains: alcohol consumption, drinking behaviors/dependence, and alcohol-related problems. A score of **8 or more** is generally considered indicative of hazardous or harmful alcohol use. **Analysis of Options:** * **Alcoholism (Correct):** AUDIT is the gold standard screening tool for identifying hazardous alcohol use in primary care settings. * **Schizophrenia (Incorrect):** Screening for psychosis typically involves tools like the PANSS (Positive and Negative Syndrome Scale) or BPRS (Brief Psychiatric Rating Scale). * **Opioid Addiction (Incorrect):** Opioid use is screened using tools like the **DAST-10** (Drug Abuse Screening Test) or the **COWS** (Clinical Opiate Withdrawal Scale) for withdrawal severity. * **Depression (Incorrect):** The most common screening tools for depression are the **PHQ-9** (Patient Health Questionnaire-9) and the **Beck Depression Inventory (BDI)**. **High-Yield Clinical Pearls for NEET-PG:** * **CAGE Questionnaire:** Another high-yield screening tool for alcoholism (**C**ut down, **A**nnoyed, **G**uilty, **E**ye-opener). A score of $\geq$ 2 is significant. * **Gold Standard for Alcohol Withdrawal:** CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol). * **Biomarkers:** **GGT** (Gamma-glutamyl transferase) is the most sensitive marker for chronic alcohol use, while **MCV** (Mean Corpuscular Volume) is often elevated. **Carbohydrate Deficient Transferrin (CDT)** is the most specific marker for long-term heavy drinking.

Question 179: All of the following may be used for detoxification therapy of chronic alcoholism except?

A. Naltrexone
B. Disulfiram
C. Flumazenil (Correct Answer)
D. Acamprostate

Explanation: ### Explanation The question asks for the drug **not** used in the detoxification or management of chronic alcoholism. **Why Flumazenil is the correct answer:** Flumazenil is a competitive **GABA-A receptor antagonist**. It is specifically used as an antidote for **Benzodiazepine (BZD) overdose**. It has no role in the management of alcohol withdrawal or maintenance therapy. In fact, using Flumazenil in a patient with chronic alcoholism (who may have co-dependence on BZDs) can precipitate seizures by lowering the seizure threshold. **Analysis of other options (Used in Alcoholism):** * **Disulfiram:** An **aldehyde dehydrogenase inhibitor**. It is used as **Aversion Therapy**. It causes the accumulation of acetaldehyde, leading to the unpleasant "Disulfiram-ethanol reaction" (flushing, tachycardia, nausea) if the patient consumes alcohol. * **Naltrexone:** An **opioid receptor antagonist**. It reduces the "reward" or euphoria associated with drinking and helps decrease alcohol cravings. It is a first-line agent for maintaining abstinence. * **Acamprosate:** A **NMDA receptor antagonist** and GABA-A agonist. It helps stabilize the chemical imbalance in the brain caused by chronic alcohol use and is particularly effective in maintaining abstinence by reducing "protracted withdrawal" symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC) for Alcohol Withdrawal:** Benzodiazepines (e.g., Chlordiazepoxide, Diazepam). * **DOC for Withdrawal in Liver Failure:** **L-O-T** (Lorazepam, Oxazepam, Temazepam) as they undergo extrahepatic metabolism. * **Wernicke’s Encephalopathy:** Always give **Thiamine (B1)** *before* Glucose to prevent precipitating acute neurological deterioration. * **Naltrexone Contraindication:** Should not be used in patients with acute hepatitis or liver failure.

Question 180: Which of the following is true about alcohol paranoia?

A. Tremors
B. Fixed hallucinations
C. Fixed delusions (Correct Answer)
D. Wrist and foot drop

Explanation: **Explanation:** **Alcohol Paranoia** (also known as Alcoholic Paranoia or Alcohol-Induced Psychotic Disorder) is a specific psychiatric complication of chronic alcohol use. The hallmark of this condition is the presence of **fixed delusions**, most commonly **delusions of infidelity** (Othello Syndrome), where the individual is unshakably convinced that their partner is being unfaithful. * **Why Option C is correct:** Unlike the transient hallucinations seen in alcohol withdrawal, alcohol paranoia involves stable, systematized, and **fixed delusions** that occur in a clear sensorium (the patient is conscious and oriented). * **Why Option A is incorrect:** Tremors are a classic sign of **Alcohol Withdrawal**, not a primary feature of the psychotic state of paranoia. * **Why Option B is incorrect:** While hallucinations can occur in "Alcoholic Hallucinosis," they are typically auditory and not "fixed." In alcohol paranoia, the primary pathology is a thought disorder (delusion), not a sensory perception disorder. * **Why Option D is incorrect:** Wrist and foot drop are signs of peripheral neuropathy, often due to **Vitamin B1 (Thiamine) deficiency** in chronic alcoholics, representing a neurological rather than a psychiatric complication. **High-Yield Clinical Pearls for NEET-PG:** * **Othello Syndrome:** A common manifestation of alcohol paranoia characterized by morbid jealousy. * **Alcoholic Hallucinosis:** Occurs in a clear sensorium (unlike Delirium Tremens) and is dominated by auditory hallucinations (threatening or derogatory voices). * **Delirium Tremens (DT):** The most severe withdrawal state, characterized by clouded consciousness, autonomic hyperactivity, and vivid visual hallucinations (e.g., Lilliputian hallucinations).

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

Practice Questions

Sedative, Hypnotic, and Anxiolytic Use Disorders

Practice Questions

Tobacco Use Disorder

Practice Questions

Hallucinogen-Related Disorders

Practice Questions

Substance Withdrawal Syndromes

Practice Questions

Pharmacotherapy for Substance Use Disorders

Practice Questions

Psychosocial Interventions

Practice Questions

Dual Diagnosis Management

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free