Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 391: What is the primary characteristic of acute alcohol intoxication?

A. Euphoria (Correct Answer)
B. Hypertension
C. Hyperglycemia
D. Dry mouth

Explanation: ***Euphoria*** - **Euphoria** is a common and primary characteristic of acute alcohol intoxication, particularly in the early stages, due to its effects on the **central nervous system** and neurotransmitter release. - Alcohol initially acts as a **central nervous system depressant**, but its effects on inhibitory neural pathways first lead to feelings of **disinhibition** and well-being. *Hypertension* - While acute alcohol consumption can initially cause a **transient increase in blood pressure**, sustained **hypertension** is more commonly associated with chronic, heavy alcohol use rather than acute intoxication itself. - The immediate effects of acute intoxication often include **vasodilation**, which can lead to a *decrease* in blood pressure, especially with higher doses. *Hyperglycemia* - Acute alcohol intoxication is more commonly associated with **hypoglycemia** rather than hyperglycemia, especially in individuals with poor nutritional status or after prolonged drinking. - Alcohol inhibits **gluconeogenesis** in the liver, which can lead to a dangerous drop in blood glucose levels. *Dry mouth* - **Dry mouth** (xerostomia) is not a primary characteristic of acute alcohol intoxication. Alcohol is a diuretic, which can lead to **dehydration**, but the immediate effects on salivary glands do not typically manifest as significant dry mouth compared to other substances or conditions. - In fact, alcohol can sometimes stimulate saliva production in small amounts, though the overall diuretic effect promotes fluid loss.

Question 392: In the context of substance use disorders, which of the following is a key criterion for diagnosing substance dependence?

A. Infrequent use of the substance
B. No tolerance or withdrawal symptoms
C. Continued use despite harmful consequences (Correct Answer)
D. Absence of craving or strong desire to use

Explanation: ***Continued use despite harmful consequences*** - This criterion highlights the **compulsive nature** of substance dependence, where the individual persists in substance use even when it leads to significant negative impacts on their physical health, psychological well-being, or social functioning. - It reflects a loss of control over substance use, indicative of a **pathological pattern** of behavior central to diagnosis. *Infrequent use of the substance* - Infrequent use generally suggests a low probability of developing **substance dependence**, which is characterized by a pattern of recurrent and often escalating use. - While occasional use can still lead to problems (substance abuse), it does not meet the established criteria for **dependence**, which require a persistent and problematic pattern. *No tolerance or withdrawal symptoms* - The presence of **tolerance** (requiring more of the substance to achieve the same effect) and **withdrawal symptoms** (unpleasant physical and psychological effects when the substance is stopped) are key diagnostic criteria for substance dependence in many diagnostic systems (e.g., DSM-5 Substance Use Disorders). - Their absence would argue against a diagnosis of dependence, although they are not universally required for all substances or individuals. *Absence of craving or strong desire to use* - **Craving** (a strong desire or urge to use the substance) is a central feature and a diagnostic criterion for substance dependence (and substance use disorder in DSM-5) because it reflects the powerful psychological drive to seek and use the substance. - The absence of craving would make a diagnosis of substance dependence much less likely, as it indicates a lower level of psychological dependence.

Question 393: A 28-year-old male with a history of heroin use presents with agitation, sweating, yawning, and diarrhea. What is the most appropriate treatment?

A. Naloxone
B. Clonidine
C. Buprenorphine (Correct Answer)
D. Methadone

Explanation: ***Buprenorphine*** - The patient's symptoms (agitation, sweating, yawning, diarrhea) are classic for **opioid withdrawal**. **Buprenorphine** is a partial opioid agonist that helps alleviate withdrawal symptoms and cravings without producing the same euphoric effects as full agonists. - It can be initiated when a patient is in **mild to moderate withdrawal** to prevent overdose and reduce the severity of symptoms, making it an appropriate choice in this scenario. *Naloxone* - **Naloxone** is an **opioid antagonist** used to **reverse opioid overdose** by rapidly displacing opioids from their receptors. - While it can precipitate acute withdrawal in opioid-dependent individuals, it is not used to treat withdrawal symptoms; rather, it is life-saving in overdose situations. *Clonidine* - **Clonidine** is an **alpha-2 adrenergic agonist** that can help reduce some **autonomic symptoms of opioid withdrawal**, such as sweating, tremors, and anxiety. - However, it does not address the opioid cravings or severe pain associated with withdrawal and is typically used as an adjunct rather than a primary treatment for full withdrawal. *Methadone* - **Methadone** is a **full opioid agonist** used for **opioid maintenance therapy** and severe withdrawal. It has a long half-life, allowing for once-daily dosing. - While effective, initiating methadone often requires specialized clinics and careful titration due to its potential for respiratory depression and overdose, making buprenorphine a more straightforward option for managing acute withdrawal in many settings.

Question 394: A 50-year-old man is experiencing withdrawal symptoms, including agitation, anxiety, and seizures, after stopping alcohol. Which of the following is the most appropriate initial treatment?

A. SSRIs
B. Benzodiazepines (Correct Answer)
C. Antipsychotics
D. Beta-blockers

Explanation: ***Benzodiazepines*** - **Benzodiazepines** are the first-line treatment for **alcohol withdrawal syndrome** due to their GABAergic effects, which counteract the CNS hyperexcitability. - They effectively reduce **agitation**, **anxiety**, and prevent potentially life-threatening **seizures** and **delirium tremens**. *SSRIs* - **SSRIs (Selective Serotonin Reuptake Inhibitors)** are primarily used to treat depression and anxiety disorders. - They do not address the acute neurochemical imbalances or prevent seizures associated with **alcohol withdrawal**. *Antipsychotics* - **Antipsychotics** are primarily used to treat psychotic symptoms such as hallucinations and delusions. - While they might address some agitation, they can lower the **seizure threshold**, making them inappropriate for acute alcohol withdrawal with seizure risk. *Beta-blockers* - **Beta-blockers** help manage some autonomic symptoms of withdrawal like **tachycardia** and **hypertension**. - However, they do not prevent **seizures** or adequately manage the severe anxiety and agitation of alcohol withdrawal.

Question 395: A 25-year-old male with a history of substance abuse presents with symptoms of tremors, agitation, and visual hallucinations. Which substance withdrawal is most likely responsible for these symptoms?

A. Alcohol (Correct Answer)
B. Opioids
C. Cannabis
D. Cocaine

Explanation: ***Alcohol*** - **Alcohol withdrawal** commonly presents with a constellation of symptoms including **tremors**, **agitation**, and potentially life-threatening **visual or auditory hallucinations** (characteristic of **delirium tremens**). - These symptoms typically develop 48-96 hours after cessation or reduction of heavy, prolonged alcohol use due to the rebound hyperactivity of the central nervous system. - The triad of tremors, agitation, and visual hallucinations is highly specific for severe alcohol withdrawal. *Opioids* - Opioid withdrawal symptoms are primarily characterized by **flu-like symptoms** such as muscle aches, rhinorrhea, lacrimation, pupillary dilation, piloerection, and gastrointestinal distress (nausea, vomiting, diarrhea). - While agitation can occur, **hallucinations and severe tremors are uncommon** in opioid withdrawal. - Opioid withdrawal is uncomfortable but not life-threatening. *Cannabis* - Cannabis withdrawal symptoms are generally mild and include **irritability**, anxiety, sleep disturbances, decreased appetite, and cravings. - **Hallucinations and significant tremors are not typical** features of cannabis withdrawal. *Cocaine* - Cocaine withdrawal (usually referred to as "cocaine crash") is characterized by **fatigue**, dysphoria, increased appetite, and psychomotor retardation or agitation. - While agitation can be present, **profuse tremors and visual hallucinations are not primary symptoms**; rather, severe depression and suicidal ideation are more concerning features.

Question 396: A 50-year-old male presents with tremors, confusion, and visual hallucinations after abruptly stopping alcohol consumption. What is the most likely diagnosis?

A. Alcohol withdrawal (Correct Answer)
B. Opioid withdrawal
C. Cannabis withdrawal
D. Cocaine withdrawal

Explanation: ***Alcohol withdrawal*** - The combination of **tremors, confusion, and visual hallucinations** following abrupt cessation of alcohol consumption is highly characteristic of **delirium tremens**, a severe form of alcohol withdrawal. - Symptoms typically begin 48-96 hours after the last drink and can be life-threatening if untreated. *Opioid withdrawal* - Opioid withdrawal symptoms commonly include **flu-like symptoms** such as muscle aches, nausea, vomiting, and diarrhea. - **Hallucinations and severe confusion** are not typical features of opioid withdrawal. *Cannabis withdrawal* - Cannabis withdrawal symptoms are generally milder and include **irritability, anxiety, sleep disturbances, and cravings**. - **Tremors, confusion, and visual hallucinations** are not associated with cannabis withdrawal. *Cocaine withdrawal* - Cocaine withdrawal often presents with **dysphoria, fatigue, increased appetite, and psychomotor retardation or agitation**. - **Hallucinations** can occur in severe cases (cocaine-induced psychosis), but the pattern of **tremors and confusion** with recent cessation is not typical for primary cocaine withdrawal.

Question 397: Which drug has the highest rate of substance dependence among its users?

A. Cocaine
B. Amphetamine
C. Heroin (Correct Answer)
D. Cannabis

Explanation: ***Correct Answer: Heroin*** - Heroin has the **highest rate of substance dependence** among users, with approximately **23-25% of users developing dependence** (some studies report up to 30%). - As an **opioid**, it binds to mu-opioid receptors in the brain, producing intense euphoria and pain relief that powerfully reinforces continued use. - Its **rapid onset**, intense effects, and severe **physical dependence** with distressing withdrawal symptoms (muscle pain, nausea, anxiety, insomnia) make it extremely difficult to quit. - Both **psychological and physical dependence** develop quickly, often after just a few uses. *Incorrect: Cocaine* - Cocaine has a lower dependence rate of approximately **15-20% of users**. - While it's a potent **stimulant** that blocks dopamine reuptake causing intense euphoria, its dependence is primarily **psychological**. - Withdrawal symptoms (depression, fatigue, increased appetite) are less physically severe than opioid withdrawal. *Incorrect: Amphetamine* - Amphetamine has a dependence rate of approximately **10-15% of users**. - As a CNS stimulant increasing dopamine and norepinephrine, it causes alertness and euphoria. - Dependence is largely **psychological**, though chronic use can cause significant health problems. *Incorrect: Cannabis* - Cannabis has the **lowest dependence rate** among these options at approximately **9-10% of users**. - THC acts on cannabinoid receptors producing relaxation and altered perception. - While **psychological dependence** can occur, physical dependence and withdrawal symptoms are significantly milder compared to opioids and stimulants.

Question 398: What term describes an irresistible urge to drink alcohol?

A. Kleptomania
B. Pyromania
C. Trichotillomania
D. Dipsomania (Correct Answer)

Explanation: ***Dipsomania*** - **Dipsomania** is a historical term used to describe an **irresistible or uncontrollable craving for alcoholic beverages**, often occurring in intermittent bouts. - While not a formal diagnosis in modern psychiatric classifications like the DSM-5, it captures the essence of an overwhelming urge to drink. *Kleptomania* - **Kleptomania** is a recurrent **impulse to steal objects** that are not needed for personal use or monetary value. - It involves a mounting sense of tension before the theft, followed by pleasure or relief during the act. *Pyromania* - **Pyromania** is an impulse control disorder characterized by an **irresistible urge to set fires** and a fascination with fire and its context. - Individuals with pyromania feel tension or affective arousal before setting a fire, and experience pleasure or relief afterward. *Trichotillomania* - **Trichotillomania** is a disorder characterized by the recurrent, irresistible urge to **pull out one's hair**, leading to noticeable hair loss. - The individual typically experiences a sense of tension before pulling the hair, and gratification or relief after.

Question 399: Which substance use disorder is MOST commonly associated with the development of marked tolerance requiring progressively larger amounts to achieve intoxication?

A. Cannabis use disorder
B. Alcohol use disorder (Correct Answer)
C. Obsessive-Compulsive Disorder (OCD)
D. None of the options

Explanation: ***Alcohol use disorder*** - **Tolerance** is one of the core diagnostic criteria for alcohol use disorder in DSM-5, manifesting as either: - A need for markedly increased amounts of alcohol to achieve intoxication or desired effect, OR - Markedly diminished effect with continued use of the same amount - Alcohol demonstrates **pronounced and clinically significant tolerance** development, often requiring substantially higher doses over time - Tolerance to alcohol is a key indicator of physiological adaptation and is strongly associated with withdrawal symptoms *Cannabis use disorder* - While cannabis use disorder **can involve tolerance**, it tends to develop more slowly and is less pronounced compared to alcohol - Cannabis tolerance is recognized in DSM-5 but is not as universally present or as dramatic in magnitude as with alcohol or opioids - Many individuals with cannabis use disorder may not develop significant tolerance *Obsessive-Compulsive Disorder (OCD)* - **OCD** is an anxiety-related disorder characterized by intrusive thoughts (obsessions) and repetitive behaviors (compulsions) - OCD is **not a substance use disorder** and does not involve the pharmacological concept of tolerance - The compulsions in OCD are driven by anxiety reduction, not substance effects *None of the options* - This is incorrect because alcohol use disorder clearly demonstrates marked tolerance development - Tolerance is a well-established diagnostic criterion for substance use disorders, particularly alcohol

Question 400: Which of the following is not typically associated with alcohol withdrawal?

A. Bradycardia (Correct Answer)
B. Tremors
C. Seizure
D. Delirium

Explanation: ***Bradycardia*** - Alcohol withdrawal is primarily associated with **autonomic hyperactivity**, leading to an *increase* in heart rate (**tachycardia**), blood pressure, and body temperature. - Therefore, **bradycardia** (abnormally slow heart rate) is not a typical symptom of alcohol withdrawal; it would suggest an alternative or co-occurring medical condition. *Seizure* - **Generalized tonic-clonic seizures** can occur 24-48 hours after the last drink in chronic alcohol users, known as **alcohol withdrawal seizures** or "rum fits." - These seizures are a result of the central nervous system's hyperexcitability after the depressant effects of alcohol are removed. *Tremors* - **Tremors** are an early and very common symptom of alcohol withdrawal, appearing within 6-12 hours after the last drink. - They are typically coarse and involve the hands, tongue, and eyelids, often exacerbated by anxiety or activity. *Delirium* - **Delirium tremens (DTs)** is a severe form of alcohol withdrawal, characterized by profound confusion, disorientation, hallucinations (often visual), and marked autonomic arousal. - DTs typically manifest 48-96 hours after cessation and are a medical emergency due to high mortality if untreated.

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