Substance Use Disorders Practice Questions

Q: Which of the following drugs is used for alcohol abstinence?

Disulfiram. **Explanation:** The management of Alcohol Use Disorder is divided into two phases: management of acute withdrawal and maintenance of abstinence (relapse prevention). **Correct Option: A. Disulfiram** Disulfiram is a classic **aversive agent** used to maintain abstinence. It works by irreversibly inhibiting the enzyme **Aldehyde Dehydrogenase**. When a patient consumes alcohol while on Disulfiram, acetaldehyde accumulates in the body, leading to the highly unpleasant **Disulfiram-Ethanol Reaction (DER)**, characterized by flushing, tachycardia, nausea, and palpitations. This psychological deterrent discourages the patient from drinking. **Incorrect Options:** * **B. Naltrexone:** While Naltrexone is used in alcohol dependence, its primary role is to **reduce craving** and the "reward" of drinking by blocking opioid receptors. While it helps maintain abstinence, Disulfiram is the classic textbook answer specifically categorized as an abstinence-promoting aversive agent. * **C. Chlordiazepoxide:** This is a long-acting benzodiazepine. It is the **drug of choice for acute alcohol withdrawal** and prevention of Delirium Tremens, but it is not used for long-term abstinence due to its own addictive potential. * **D. Morphine:** This is an opioid agonist and has no role in the treatment of alcohol use disorder; it would potentially lead to poly-substance abuse. **High-Yield Clinical Pearls for NEET-PG:** * **Acamprosate:** Another drug for abstinence; it reduces glutamate activity and is the drug of choice in patients with **liver disease** (unlike Disulfiram/Naltrexone). * **Disulfiram-like reaction:** Can be caused by other drugs like Metronidazole, Griseofulvin, and Cefotetan. * **Topiramate & Baclofen:** Emerging second-line agents for reducing alcohol consumption.

Q: Excessive desire for substance abuse in a drug addict is called:

Craving. ### Explanation **Correct Option: A. Craving** In the context of substance use disorders, **craving** is defined as a strong, subjective desire or an overwhelming urge to consume a particular drug. It is a core clinical feature of addiction and is often triggered by environmental cues associated with previous drug use (e.g., seeing a needle or visiting a specific location). In the DSM-5 criteria, craving is specifically highlighted as a diagnostic criterion for Substance Use Disorders. **Analysis of Incorrect Options:** * **B. Impulse:** This refers to a sudden, unpremeditated urge to act without considering the consequences. While addiction involves impulsivity (especially in early stages), "impulse" is a general behavioral term and not the specific clinical term for the "desire" for a drug. * **C. Dependence:** This is a broader physiological or psychological state where the body requires the substance to function normally. It is characterized by **tolerance** (needing more for the same effect) and **withdrawal** (physical symptoms upon cessation). Dependence is the *state*, whereas craving is the *subjective desire*. * **D. Compulsion:** This refers to repetitive behaviors that an individual feels driven to perform, often to reduce anxiety. In addiction, drug-seeking becomes "compulsive" when the user continues despite clear negative consequences, but the "desire" itself is the craving. **High-Yield Clinical Pearls for NEET-PG:** * **Neurobiology:** Craving is primarily mediated by the **Mesolimbic Dopaminergic Pathway** (the "Reward Pathway"), specifically involving the Nucleus Accumbens and the Ventral Tegmental Area (VTA). * **Anti-craving agents:** * **Alcohol:** Naltrexone, Acamprosate. * **Opioids:** Methadone, Buprenorphine. * **Nicotine:** Varenicline, Bupropion. * **Cue-induced craving** is a major cause of relapse even after long periods of abstinence.

Q: Which of the following is FALSE regarding Alcoholics Anonymous?

It provides incentives for quitting alcohol.. **Explanation:** Alcoholics Anonymous (AA) is a worldwide, non-professional organization founded in 1935 by Bill Wilson and Dr. Bob Smith. It operates on the principle of **mutual aid** and spiritual growth rather than material or financial rewards. **Why Option D is the correct (False) statement:** AA does **not provide incentives** (such as money, vouchers, or material rewards) for quitting alcohol. The motivation for sobriety in AA is rooted in the "12-step program," peer support, and spiritual awakening. Providing incentives is a feature of **Contingency Management**, a different behavioral therapy technique used in addiction treatment, but it is not a part of the AA model. **Analysis of Incorrect Options:** * **Option A (True):** AA is the prototype of a **self-help group**. It is run by members for members, without professional leadership or government funding. * **Option B (True):** The core philosophy of AA is the **12-step program**, which includes admitting powerlessness over alcohol, making amends, and helping others. * **Option C (True):** The group consists of **recovered alcoholics** who act as "sponsors" and volunteers who share their experiences to help new members achieve sobriety. **High-Yield Clinical Pearls for NEET-PG:** * **Al-Anon:** A support group specifically for the **families and friends** of alcoholics. * **Alateen:** A support group for **teenagers** affected by someone else's alcoholism. * **Anonymity:** The "Anonymous" part of the name signifies that members' identities and shared stories remain confidential, reducing the stigma of seeking help. * **Goal:** The primary goal of AA is **total abstinence**, not controlled drinking.

Q: Delirium tremens is characterized by confusion associated with which of the following?

Autonomic hyperactivity and tremors. **Explanation:** **Delirium Tremens (DT)** is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. It is a medical emergency characterized by a "clouding of consciousness" (delirium) and significant **autonomic hyperactivity**. 1. **Why Option A is Correct:** The pathophysiology involves the sudden removal of alcohol’s inhibitory effect on GABA receptors and a compensatory overactivity of NMDA (glutamate) receptors. This neuro-excitation manifests as profound autonomic instability (tachycardia, hypertension, fever, diaphoresis) and coarse tremors. Visual and tactile hallucinations (e.g., formication) are also hallmark features. 2. **Why Other Options are Incorrect:** * **Option B:** DT is a **withdrawal** phenomenon, not an intoxication state. Intoxication presents with slurred speech, ataxia, and CNS depression. * **Option C:** Sixth nerve palsy (Abducens nerve) is a classic sign of **Wernicke’s Encephalopathy**, caused by Thiamine (B1) deficiency, not DT. * **Option D:** **Korsakoff Psychosis** is a chronic sequela of Thiamine deficiency characterized by anterograde amnesia and confabulation; it lacks the acute autonomic storm seen in DT. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** Minor withdrawal (6–12h) → Seizures (12–48h) → Hallucinosis (12–48h) → **DT (48–96h)**. * **Mortality:** If untreated, DT has a mortality rate of up to 20% (usually due to arrhythmia or hyperthermia). * **Drug of Choice:** **Benzodiazepines** (e.g., Diazepam or Lorazepam) are the gold standard for management. * **Risk Factor:** A history of prior withdrawal seizures or DT increases the risk of recurrence.

Q: A patient reports a sensation of insects crawling on or under the skin. This phenomenon is known as a specific type of hallucination. Which of the following conditions is most commonly associated with this sensory experience?

Cocaine abuse. ### Explanation **Correct Option: D. Cocaine abuse** The sensation of insects crawling on or under the skin is known as **Formication**. When specifically associated with cocaine use, it is termed **"Cocaine Bugs"** or **Magnan’s sign**. This is a type of tactile hallucination (haptic hallucination). It occurs due to the stimulant effect of cocaine on the central nervous system, which can lead to sensory distortions and paranoid psychosis. Patients often present with "excoriation disorder" (skin picking) or "pocked" skin as they attempt to dig out the non-existent insects. **Analysis of Incorrect Options:** * **A. Alcohol withdrawal:** While alcohol withdrawal can cause tactile hallucinations (and more commonly visual hallucinations like *Lilliputian hallucinations*), formication is the classic hallmark of stimulant abuse (Cocaine/Amphetamines). * **B. Lead poisoning:** Lead toxicity typically presents with neurological symptoms like encephalopathy, peripheral neuropathy (wrist drop/foot drop), and abdominal colic, but not typically formication. * **C. Schizophrenia:** While tactile hallucinations can occur in schizophrenia, they are much less common than auditory hallucinations. Formication is more characteristically associated with organic/substance-induced states. **High-Yield Clinical Pearls for NEET-PG:** * **Magnan’s Sign:** Specifically refers to the tactile hallucination of crawling insects in chronic cocaine users. * **Tactile Hallucinations:** Also seen in **Ekbom’s Syndrome** (Delusional Parasitosis), where the patient has a fixed false belief of infestation. * **Formication vs. Lilliputian:** Formication is tactile (crawling insects); Lilliputian is visual (seeing tiny people/objects), often seen in Delirium Tremens. * **Other Stimulants:** Amphetamines and Methamphetamines can also cause similar formication ("Meth bugs").

Q: All of the following are psychedelic drugs except?

Cocaine. **Explanation:** The question asks to identify the drug that is **not** a psychedelic. **1. Why Cocaine is the correct answer:** Cocaine is classified as a **Psychostimulant**, not a psychedelic. Its primary mechanism involves blocking the reuptake of monoamines (Dopamine, Norepinephrine, and Serotonin) in the synaptic cleft, leading to increased sympathetic activity. Clinically, it produces euphoria, increased alertness, and sympathomimetic effects (tachycardia, mydriasis), rather than the primary sensory distortions and "mind-manifesting" experiences characteristic of psychedelics. **2. Why the other options are incorrect:** * **Lysergic acid diethylamide (LSD):** The prototype **Serotonergic Hallucinogen**. It acts as a partial agonist at 5-HT2A receptors, causing profound alterations in perception, mood, and cognitive processes (e.g., synesthesia). * **Mescaline:** A naturally occurring psychedelic alkaloid derived from the **Peyote cactus**. Like LSD, it acts primarily on serotonin receptors to produce hallucinogenic effects. * **Phencyclidine (PCP):** Known as a **Dissociative Anesthetic/Hallucinogen**. It acts as an NMDA receptor antagonist. While its mechanism differs from LSD, it is traditionally categorized under the broad umbrella of psychedelic/hallucinogenic substances due to the detachment and sensory distortions it induces. **Clinical Pearls for NEET-PG:** * **Hallucinogen Persisting Perception Disorder (HPPD):** Re-experiencing perceptual symptoms ("flashbacks") long after stopping LSD. * **PCP Toxicity:** Look for **vertical/rotary nystagmus** and extreme agitation/belligerence in clinical vignettes. * **Cocaine Complication:** Formication (sensation of insects crawling under the skin, known as "Cocaine bugs"). * **Antidote:** There is no specific antidote for Cocaine; management is supportive (Benzodiazepines for agitation/seizures). Avoid Beta-blockers due to risk of unopposed alpha-stimulation.

Q: All are symptoms of opiate withdrawal except:

Excessive speech. **Explanation:** Opiate withdrawal is characterized by a "rebound" of the autonomic nervous system. Since opioids are central nervous system (CNS) depressants that cause constipation, miosis (pupillary constriction), and sedation, their withdrawal results in the polar opposite effects: **CNS hyperexcitability and autonomic hyperactivity.** **Why "Excessive Speech" is the correct answer:** Excessive speech (logorrhea) or pressured speech is a hallmark of **stimulant intoxication** (e.g., cocaine, amphetamines) or manic episodes. In opiate withdrawal, while the patient may be anxious or irritable, they do not typically exhibit the increased talkativeness associated with dopamine-driven stimulant use. **Analysis of Incorrect Options:** * **Diarrhea:** Opioids cause constipation by slowing GI motility. Withdrawal leads to intestinal hypermotility, resulting in abdominal cramps and diarrhea. * **Lacrimation:** This is a classic "wet" symptom of opiate withdrawal, alongside rhinorrhea (runny nose) and sweating (diaphoresis). * **Mydriasis:** While opioid intoxication causes "pinpoint pupils" (miosis), withdrawal causes pupillary dilation (mydriasis) due to sympathetic overactivity. **High-Yield Clinical Pearls for NEET-PG:** * **Objective Signs:** Look for **piloerection** (goosebumps), which gives rise to the term "cold turkey." * **Yawning:** A highly specific early sign of opioid withdrawal often tested in exams. * **Timeline:** Symptoms usually peak at 48–72 hours for heroin. * **Management:** Clonidine (alpha-2 agonist) is used to treat autonomic symptoms; Methadone or Buprenorphine is used for detoxification/maintenance. * **Crucial Fact:** Unlike alcohol or benzodiazepine withdrawal, pure opioid withdrawal is extremely uncomfortable but **rarely life-threatening.**

Q: Methadone is used in the treatment of overdose of which of the following substances?

Heroin. **Explanation:** The correct answer is **Heroin**. **Why Heroin is Correct:** Methadone is a **long-acting synthetic opioid agonist** that binds to the $\mu$-opioid receptors. In the context of opioid use disorder (specifically Heroin), Methadone is used for **Maintenance Therapy** and detoxification. It works by preventing withdrawal symptoms and reducing "craving" without producing the intense euphoria associated with shorter-acting opioids like heroin. This is due to its long half-life (24–36 hours) and slow onset of action. *Note on the Question Wording:* While the question uses the term "overdose," clinically, Methadone is the gold standard for **Opioid Substitution Therapy (OST)**. For acute life-threatening respiratory depression in an opioid overdose, the drug of choice is **Naloxone** (an antagonist). **Why Other Options are Incorrect:** * **Cocaine & Amphetamines:** These are CNS stimulants. There is no specific pharmacological replacement therapy like methadone for stimulants; management is primarily supportive (e.g., benzodiazepines for agitation). * **Barbiturates:** These are sedative-hypnotics. Overdose is managed with supportive care (airway protection) and alkalization of urine (for phenobarbital). There is no role for methadone here. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice for Acute Opioid Overdose:** Naloxone (IV/Intranasal). * **Drug of Choice for Opioid Withdrawal in Pregnancy:** Methadone. * **Buprenorphine:** A partial $\mu$-agonist and $\kappa$-antagonist; also used for maintenance but has a "ceiling effect" on respiratory depression, making it safer than methadone. * **Naltrexone:** An oral opioid antagonist used for relapse prevention *after* detoxification is complete.

Question 1

Which of the following drugs is used for alcohol abstinence?

Accepted Answer

Disulfiram

Answer

Naltrexone

Answer

Chlordiazepoxide

Answer

Morphine

Question 2

Excessive desire for substance abuse in a drug addict is called:

Accepted Answer

Craving

Answer

Impulse

Answer

Dependence

Answer

Compulsion

Question 3

Which of the following is FALSE regarding Alcoholics Anonymous?

Accepted Answer

It provides incentives for quitting alcohol.

Answer

It is a self-help group.

Answer

It follows 12 steps to quit alcohol.

Answer

It includes recovered patients and volunteers.

Question 4

Delirium tremens is characterized by confusion associated with which of the following?

Accepted Answer

Autonomic hyperactivity and tremors

Answer

Features of intoxication due to alcohol

Answer

Sixth nerve palsy

Answer

Korsakoff psychosis

Question 5

A patient reports a sensation of insects crawling on or under the skin. This phenomenon is known as a specific type of hallucination. Which of the following conditions is most commonly associated with this sensory experience?

Accepted Answer

Cocaine abuse

Answer

Alcohol withdrawal

Answer

Lead poisoning

Answer

Schizophrenia

Question 6

All of the following are psychedelic drugs except?

Accepted Answer

Cocaine

Answer

Lysergic acid diethylamide

Answer

Phencyclidine

Answer

Mescaline

Question 7

A person consumes large quantities of alcohol daily for 20 years and is physically dependent on alcohol. Which drug should be given to this person?

Accepted Answer

Disulfiram

Answer

Acamprosate

Answer

Naltrexone

Answer

Chlordiazepoxide

Question 8

Physical dependence is not seen with which of the following?

Accepted Answer

Raw opium

Answer

Alcohol

Answer

Benzodiazepines

Question 9

All are symptoms of opiate withdrawal except:

Accepted Answer

Excessive speech

Answer

Diarrhea

Answer

Lacrimation

Answer

Mydriasis

Question 10

Methadone is used in the treatment of overdose of which of the following substances?

Accepted Answer

Heroin

Answer

Cocaine

Answer

Amphetamine

Answer

Barbiturate

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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