Substance Use Disorders Practice Questions

Q: A patient presents with conjunctival congestion, increased appetite, dry mouth, tachycardia, and synesthesia. Which substance is most likely responsible for these effects?

Cannabis. ### Explanation The clinical presentation described is classic for **Cannabis (Marijuana)** intoxication. **1. Why Cannabis is correct:** Cannabis acts on CB1 and CB2 receptors. The hallmark signs include: * **Conjunctival Congestion:** Dilation of conjunctival blood vessels (red eyes) is a highly specific physical sign. * **Increased Appetite:** Often referred to as "the munchies." * **Dry Mouth (Xerostomia):** Due to the inhibition of parasympathetic signaling to salivary glands. * **Tachycardia:** A common cardiovascular response to THC. * **Synesthesia:** A perceptual phenomenon where senses "blend" (e.g., "hearing colors" or "seeing sounds"). While common in LSD, it is a high-yield feature of cannabis intoxication in psychiatric exams. **2. Why the other options are incorrect:** * **Caffeine:** Causes tachycardia and anxiety, but leads to insomnia and decreased appetite, not conjunctival congestion or synesthesia. * **Cocaine:** A potent stimulant causing pupillary **dilation (mydriasis)**, hypertension, and agitation. It typically suppresses appetite. * **Codeine:** An opioid that causes pupillary **constriction (miosis)**, respiratory depression, and constipation. It does not cause conjunctival congestion or synesthesia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Amotivational Syndrome:** A chronic effect of cannabis use characterized by apathy, lack of energy, and social withdrawal. * **Flashbacks:** Spontaneous recurrences of sensory distortions (more common with LSD, but can occur with cannabis). * **Therapeutic Use:** Cannabinoids (e.g., Dronabinol) are used for chemotherapy-induced nausea and appetite stimulation in AIDS-related wasting. * **Psychosis:** Cannabis is a known risk factor for precipitating schizophrenia in genetically predisposed individuals.

Q: "Bad-trip" is associated with which of the following substances?

LSD. **Explanation:** The term **"Bad-trip"** refers to a **Panic Reaction** or an acute adverse psychological reaction characterized by intense anxiety, terrifying hallucinations, loss of control, and a fear of impending doom. This phenomenon is most classically and frequently associated with **LSD (Lysergic Acid Diethylamide)**, a potent hallucinogen. **Why LSD is the correct answer:** LSD acts primarily as a partial agonist at **5-HT2A receptors**. The "bad trip" occurs when the psychedelic experience becomes overwhelming. Patients may experience "horrific" visual hallucinations (e.g., seeing themselves decomposing) or "synesthesia" (hearing colors/seeing sounds). Management typically involves a "talk-down" approach in a quiet room or the use of benzodiazepines. **Analysis of Incorrect Options:** * **Bhang & Ganja (Cannabis):** While high doses of cannabis can cause "Cannabis Psychosis" or acute panic, the specific nomenclature "bad-trip" is the hallmark of hallucinogens like LSD. Cannabis is more commonly associated with "Amotivational Syndrome" and "Run-Amok." * **Cocaine:** As a potent sympathomimetic stimulant, cocaine toxicity presents with tachycardia, hypertension, and "Cocaine Bugs" (Formication/Magnan’s sign). It does not typically cause the classic hallucinogenic "bad trip." **High-Yield Clinical Pearls for NEET-PG:** * **Flashbacks (Hallucinogen Persisting Perception Disorder):** Recurrence of the LSD experience weeks or months after the last dose. * **LSD Source:** Derived from the fungus *Claviceps purpurea* (Ergot). * **Pupillary Sign:** LSD causes marked **Mydriasis** (dilated pupils), whereas Opioids cause Miosis (pinpoint pupils). * **Tolerance:** LSD shows rapid tolerance but **no physical dependence** or withdrawal symptoms.

Q: Amotivational syndrome is seen with which substance?

Cannabis. **Explanation:** **Amotivational Syndrome** is a controversial but clinically recognized chronic psychiatric condition characterized by a loss of ambition, apathy, diminished ability to carry out complex plans, and a lack of interest in future goals. **1. Why Cannabis is correct:** Amotivational syndrome is classically associated with **chronic, heavy use of Cannabis**. The underlying medical concept involves the downregulation of dopamine receptors in the reward circuitry and frontal lobe dysfunction. Patients typically present with "flattened affect," poor personal hygiene, social withdrawal, and a marked decline in academic or occupational performance, even when not acutely intoxicated. **2. Why other options are incorrect:** * **Heroin (Opioids):** Chronic use leads to physical dependence, tolerance, and withdrawal symptoms (lacrimation, rhinorrhea, yawning). While it causes sedation, it does not typically manifest as the specific "amotivational" cluster. * **Cocaine (Stimulants):** Cocaine use is associated with euphoria, increased energy, and hypervigilance. Chronic use or withdrawal leads to "crashing" (depression and hypersomnia), but not the distinct amotivational syndrome. * **Clonidine:** This is an alpha-2 agonist used to manage opioid withdrawal symptoms (autonomic hyperactivity). It is not a drug of abuse associated with this syndrome. **Clinical Pearls for NEET-PG:** * **Cannabis and Psychosis:** Cannabis is a known risk factor for precipitating **Schizophrenia** in genetically predisposed individuals. * **Flashbacks:** Also known as Hallucinogen Persisting Perception Disorder (HPPD), these are common with LSD but can also occur with Cannabis. * **Run Amok:** A culture-bound syndrome traditionally associated with cannabis use (though now considered more broadly) involving a sudden outburst of violent or homicidal behavior. * **Active Ingredient:** Delta-9-tetrahydrocannabinol (THC).

Q: Disulfiram is used to treat which of the following conditions?

Alcohol dependence. **Explanation:** **Disulfiram** is a classic pharmacological intervention used as an **aversion therapy** for **Alcohol Dependence**. **Mechanism of Action:** Under normal conditions, alcohol is metabolized into acetaldehyde by alcohol dehydrogenase, which is then converted into acetic acid by the enzyme **Aldehyde Dehydrogenase (ALDH)**. Disulfiram irreversibly inhibits ALDH. When a patient consumes alcohol while on Disulfiram, acetaldehyde accumulates in the blood, leading to the **Disulfiram-Ethanol Reaction (DER)**. This reaction is characterized by flushing, tachycardia, nausea, vomiting, headache, and hypotension, serving as a powerful psychological deterrent against drinking. **Analysis of Incorrect Options:** * **Opioid Dependence:** Managed with agonists (Methadone), partial agonists (Buprenorphine), or antagonists (Naltrexone). Disulfiram has no role in opioid receptor modulation. * **Cocaine & Amphetamine Dependence:** These stimulant use disorders are primarily managed through behavioral therapies (Contingency Management). While some studies have explored Disulfiram for cocaine (due to its effect on dopamine beta-hydroxylase), it is not the standard or FDA-approved treatment. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Disulfiram should never be administered until the patient has abstained from alcohol for at least **12 hours**. * **Duration:** The effects can last up to **1–2 weeks** after the last dose because the body must synthesize new ALDH enzymes. * **Contraindications:** Severe cardiac disease, psychosis, and pregnancy. * **Acamprosate vs. Naltrexone:** Remember that while Disulfiram is for aversion, **Naltrexone** reduces cravings/reward, and **Acamprosate** is best for maintaining abstinence by stabilizing glutamate/GABA neurochemistry.

Q: Which substance, if used for a prolonged period, is associated with memory loss?

Alcohol. **Explanation:** **Alcohol** is the correct answer because its chronic use is classically associated with severe memory impairment through both direct neurotoxicity and nutritional deficiency. The most high-yield mechanism is **Thiamine (Vitamin B1) deficiency**, which leads to **Wernicke-Korsakoff Syndrome**. While Wernicke’s is an acute neurological emergency, **Korsakoff Psychosis** is the chronic phase characterized by profound **anterograde amnesia** (inability to form new memories) and **confabulation** (filling memory gaps with fabricated stories). **Analysis of Incorrect Options:** * **Marijuana:** While acute intoxication causes transient short-term memory impairment and "amotivational syndrome" with chronic use, it does not typically cause the profound, permanent memory loss seen with alcohol. * **Cocaine:** As a stimulant, its chronic use is more closely linked to mood disturbances, paranoia, and cardiovascular complications rather than primary memory loss. * **LSD:** A hallucinogen that primarily causes perceptual distortions (hallucinations) and "flashbacks" (Hallucinogen Persisting Perception Disorder). It is not associated with organic memory deficits. **Clinical Pearls for NEET-PG:** * **Korsakoff’s Triad:** Amnesia, Confabulation, and Lack of Insight. * **Wernicke’s Triad:** Ataxia, Global Confusion, and Ophthalmoplegia (6th nerve palsy). * **Pathology:** Look for **Mammillary body atrophy** on MRI in chronic alcoholics with memory loss. * **Management:** Always administer Thiamine *before* Glucose in suspected cases to prevent precipitating Wernicke’s encephalopathy.

Q: Suboxone is a combination of which medications?

Naloxone and buprenorphine. **Explanation:** **Suboxone** is a fixed-dose combination of **Buprenorphine and Naloxone**, typically in a **4:1 ratio**. It is primarily used in the maintenance treatment of Opioid Use Disorder (OUD). * **Buprenorphine:** A high-affinity **partial opioid μ-receptor agonist** and κ-receptor antagonist. It relieves withdrawal symptoms and cravings due to its long half-life and "ceiling effect," which reduces the risk of respiratory depression. * **Naloxone:** A pure **opioid antagonist**. It is added to Suboxone specifically to **prevent intravenous abuse**. When taken sublingually (as intended), naloxone has poor bioavailability and exerts no effect. However, if a user attempts to crush and inject the tablet, the naloxone enters the bloodstream, triggering immediate precipitated withdrawal. **Analysis of Incorrect Options:** * **A. Naloxone and Naltrexone:** Both are antagonists; combining them serves no therapeutic purpose in OUD maintenance. * **B. Methadone and Buprenorphine:** Both are used for OUD, but methadone is a full agonist and buprenorphine is a partial agonist. Combining them can lead to precipitated withdrawal or reduced efficacy. * **D. LAAM and Heroin:** LAAM (Levo-alpha-acetylmethadol) is a long-acting opioid agonist (now largely discontinued); heroin is an illicit drug of abuse. **High-Yield Clinical Pearls for NEET-PG:** 1. **Ceiling Effect:** Buprenorphine has a "ceiling" on respiratory depression, making it safer than methadone in overdose. 2. **Precipitated Withdrawal:** Buprenorphine should only be started when the patient is in **mild-to-moderate withdrawal** (COWS score >12) to avoid displacing full agonists from receptors too abruptly. 3. **Drug of Choice:** While Methadone is often preferred for severe dependence, Suboxone is preferred for office-based treatment due to its lower abuse potential.

Q: Psychosis resulting from chronic amphetamine intake most commonly resembles which of the following conditions?

Paranoid schizophrenia. **Explanation:** **Why Paranoid Schizophrenia is Correct:** Chronic amphetamine use leads to an increase in synaptic dopamine levels, particularly in the mesolimbic pathway. This neurochemical state closely mimics the pathophysiology of schizophrenia. The resulting **Amphetamine-Induced Psychotic Disorder** is characterized by prominent **persecutory delusions**, auditory and visual hallucinations, and ideas of reference. Unlike other drug-induced states, the sensorium remains clear, and the clinical presentation is often indistinguishable from the positive symptoms of **Paranoid Schizophrenia**. **Why Other Options are Incorrect:** * **Delirium:** While acute intoxication can cause confusion, chronic amphetamine psychosis occurs in a state of **clear consciousness** (no clouding of sensorium), which is the hallmark that differentiates it from delirium. * **Mania:** Amphetamines can cause euphoria and hyperactivity, but the specific chronic psychotic state is defined by structured delusions and hallucinations rather than the primary mood disturbance and pressured speech seen in Mania. * **Dissociative Disorder:** This involves a breakdown of memory, identity, or perception (e.g., amnesia, fugue) and is not characterized by the dopamine-driven psychotic symptoms seen in stimulant abuse. **High-Yield Clinical Pearls for NEET-PG:** * **Formication (Cocaine Bugs/Magnan’s Symptom):** A specific tactile hallucination (feeling of insects crawling under the skin) common in both cocaine and amphetamine use. * **Treatment:** The primary treatment for amphetamine psychosis is **Antipsychotics** (D2 receptor antagonists) like Haloperidol, along with acidification of urine to hasten excretion. * **Key Differentiator:** The presence of **visual hallucinations** is more common in drug-induced psychosis than in idiopathic schizophrenia.

Question 1

All of the following are true about alcohol abuse except?

Accepted Answer

MCV is decreased in chronic alcoholics.

Answer

Alcoholic hallucinosis is seen after 12-24 hours of alcohol withdrawal.

Answer

Widmark formula is used to calculate blood alcohol concentration.

Answer

CAGE questionnaire is used as a screening test for alcohol abuse.

Question 2

A patient presents with conjunctival congestion, increased appetite, dry mouth, tachycardia, and synesthesia. Which substance is most likely responsible for these effects?

Accepted Answer

Cannabis

Answer

Caffeine

Answer

Cocaine

Answer

Codeine

Question 3

An alcoholic patient feels like insects are running over his skin. This is known as:

Accepted Answer

Formication

Answer

Delusion

Answer

Dementia

Answer

Delirium

Question 4

"Bad-trip" is associated with which of the following substances?

Accepted Answer

LSD

Answer

Bhang

Answer

Ganja

Answer

Cocaine

Question 5

Amotivational syndrome is seen with which substance?

Accepted Answer

Cannabis

Answer

Heroin

Answer

Cocaine

Answer

Clonidine

Question 6

Disulfiram is used to treat which of the following conditions?

Accepted Answer

Alcohol dependence

Answer

Opioid dependence

Answer

Cocaine dependence

Answer

Amphetamine dependence

Question 7

Which substance, if used for a prolonged period, is associated with memory loss?

Accepted Answer

Alcohol

Answer

Marijuana

Answer

Cocaine

Answer

LSD

Question 8

Suboxone is a combination of which medications?

Accepted Answer

Naloxone and buprenorphine

Answer

Naloxone and naltrexone

Answer

Methadone and buprenorphine

Answer

LAAM and heroin

Question 9

What is the mechanism of action of clonidine in opioid withdrawal syndrome?

Accepted Answer

Action on alpha-2 presynaptic nerve endings

Answer

Beta-blocking effect

Answer

Inhibition of opioid receptor

Answer

Postsynaptic action

Question 10

Psychosis resulting from chronic amphetamine intake most commonly resembles which of the following conditions?

Accepted Answer

Paranoid schizophrenia

Answer

Delirium

Answer

Mania

Answer

Dissociative disorder

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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