Drug addiction and substance abuse present complex social and health challenges that B. Pharm students must understand. This topic covers neurobiology of dependence, pharmacology of commonly abused substances, clinical features of intoxication and withdrawal, evidence-based treatments (agonists, antagonists, detoxification), harm reduction, rehabilitation strategies, public health implications, and legal/ethical issues. Knowledge of screening tools, pharmacotherapy (methadone, buprenorphine, naltrexone, disulfiram, acamprosate, naloxone), comorbidities (HIV, hepatitis, mental illness), and prevention policies is essential for future pharmacists involved in patient counseling, medication management, and community programs. These MCQs emphasize clinical decision-making, adverse drug interactions, dosing, monitoring, and public health interventions to prepare you for examinations and pharmacy practice. Now let’s test your knowledge with 30 MCQs on this topic.
Q1. Which term does the DSM-5 use to describe the spectrum of problematic substance use?
- Substance dependence
- Substance abuse
- Substance use disorder
- Substance intoxication
Correct Answer: Substance use disorder
Q2. Which neurotransmitter is most closely associated with the brain reward pathway involved in addiction?
- Serotonin
- Dopamine
- GABA
- Acetylcholine
Correct Answer: Dopamine
Q3. What is the immediate antidote for opioid overdose used in emergency settings?
- Naltrexone
- Flumazenil
- Naloxone
- Atropine
Correct Answer: Naloxone
Q4. Methadone used in opioid substitution therapy acts primarily as:
- A competitive opioid antagonist
- A partial μ-opioid receptor agonist
- A long-acting full μ-opioid receptor agonist
- A monoamine oxidase inhibitor
Correct Answer: A long-acting full μ-opioid receptor agonist
Q5. Buprenorphine’s pharmacologic profile is best described as:
- Full μ-opioid receptor agonist and κ-agonist
- Partial μ-opioid receptor agonist and κ-opioid receptor antagonist
- Pure opioid antagonist
- NMDA receptor antagonist
Correct Answer: Partial μ-opioid receptor agonist and κ-opioid receptor antagonist
Q6. Naltrexone is indicated in the management of which conditions?
- Opioid dependence only
- Alcohol dependence only
- Both opioid and alcohol dependence as an opioid receptor antagonist
- Benzodiazepine overdose
Correct Answer: Both opioid and alcohol dependence as an opioid receptor antagonist
Q7. The most serious acute complication of alcohol withdrawal, characterized by confusion, autonomic instability, and hallucinations, is:
- Wernicke’s encephalopathy
- Korsakoff’s syndrome
- Delirium tremens
- Hepatic encephalopathy
Correct Answer: Delirium tremens
Q8. Which medication has the strongest evidence to reduce heavy drinking days in alcohol use disorder?
- Disulfiram
- Acamprosate
- Naltrexone
- Benzodiazepines
Correct Answer: Naltrexone
Q9. Disulfiram reduces alcohol consumption by inhibiting which enzyme?
- Alcohol dehydrogenase
- Aldehyde dehydrogenase
- Monoamine oxidase
- Cytochrome P450 2E1
Correct Answer: Aldehyde dehydrogenase
Q10. The AUDIT screening tool is designed to detect which condition?
- Depression severity
- Alcohol Use Disorders Identification Test
- Drug dependence screening
- Hepatitis risk assessment
Correct Answer: Alcohol Use Disorders Identification Test
Q11. Tolerance in substance use is best defined as:
- A persistent craving despite abstinence
- A decreased effect from the same dose over time
- An immediate allergic reaction to a drug
- A cognitive impairment caused by intoxication
Correct Answer: A decreased effect from the same dose over time
Q12. Pharmacological dependence differs from addiction in that dependence primarily reflects:
- Compulsive drug-seeking behavior
- Physiological adaptation and withdrawal on cessation
- Criminal activity related to drug use
- Social isolation due to substance use
Correct Answer: Physiological adaptation and withdrawal on cessation
Q13. Which harm reduction intervention most directly reduces blood-borne infection transmission among people who inject drugs?
- Criminalizing drug possession
- Needle and syringe exchange programs
- Compulsory inpatient treatment
- Public awareness posters
Correct Answer: Needle and syringe exchange programs
Q14. Which psychiatric disorder commonly co-occurs with substance use disorders and complicates treatment?
- Osteoporosis
- Major depressive disorder
- Rheumatoid arthritis
- Myopia
Correct Answer: Major depressive disorder
Q15. Clonidine can be used in opioid withdrawal because it:
- Is a full opioid agonist that replaces heroin
- Stimulates dopamine release in the nucleus accumbens
- Is an α2-adrenergic agonist that reduces noradrenergic hyperactivity
- Blocks NMDA receptors to reduce cravings
Correct Answer: Is an α2-adrenergic agonist that reduces noradrenergic hyperactivity
Q16. Which medication used in opioid maintenance therapy is associated with QT interval prolongation?
- Methadone
- Buprenorphine
- Naloxone
- Naltrexone
Correct Answer: Methadone
Q17. The specific antagonist used for benzodiazepine overdose in selected patients is:
- Naloxone
- Flumazenil
- Physostigmine
- Propranolol
Correct Answer: Flumazenil
Q18. A sensitive biomarker for chronic heavy alcohol consumption is:
- Carbohydrate-deficient transferrin (CDT)
- C-reactive protein (CRP)
- Serum creatinine
- Erythrocyte sedimentation rate (ESR)
Correct Answer: Carbohydrate-deficient transferrin (CDT)
Q19. Chronic heavy alcohol use most commonly causes long-term damage to which organ?
- Lungs
- Liver
- Pancreas only
- Skin
Correct Answer: Liver
Q20. Which vaccine is especially recommended for people who inject drugs to reduce long-term morbidity?
- HPV vaccine
- Influenza vaccine
- Hepatitis B vaccine
- Measles vaccine
Correct Answer: Hepatitis B vaccine
Q21. Naloxone reverses opioid effects by acting as a:
- Non-competitive opioid receptor agonist
- Uncompetitive NMDA antagonist
- Competitive opioid receptor antagonist
- GABA receptor agonist
Correct Answer: Competitive opioid receptor antagonist
Q22. Nicotine replacement therapy aids smoking cessation primarily by:
- Blocking nicotinic receptors permanently
- Providing controlled nicotine to reduce withdrawal
- Inhibiting dopamine reuptake
- Acting as a serotonin agonist
Correct Answer: Providing controlled nicotine to reduce withdrawal
Q23. Bupropion facilitates smoking cessation through which mechanism?
- Partial nicotinic receptor agonism
- Norepinephrine-dopamine reuptake inhibition (NDRI)
- Monoamine oxidase inhibition
- GABA potentiation
Correct Answer: Norepinephrine-dopamine reuptake inhibition (NDRI)
Q24. Varenicline’s action in smoking cessation is best described as:
- A full agonist at α4β2 nicotinic receptors
- A dopamine receptor antagonist
- A partial agonist at α4β2 nicotinic receptors
- A monoamine oxidase inhibitor
Correct Answer: A partial agonist at α4β2 nicotinic receptors
Q25. Which behavior in substance users most directly increases risk of HIV and hepatitis C transmission?
- Oral ingestion of alcohol
- Sharing injection equipment
- Smoking cannabis
- Using transdermal patches
Correct Answer: Sharing injection equipment
Q26. Chronic cocaine use is particularly associated with which cardiovascular risk?
- Coronary vasospasm leading to myocardial infarction
- Primary pulmonary fibrosis
- Progressive peripheral neuropathy only
- Hyperkalemia
Correct Answer: Coronary vasospasm leading to myocardial infarction
Q27. Motivational interviewing in addiction treatment is primarily intended to:
- Confront and shame the patient into abstinence
- Enhance intrinsic motivation by exploring ambivalence
- Provide medication directly without counseling
- Enforce mandatory treatment compliance
Correct Answer: Enhance intrinsic motivation by exploring ambivalence
Q28. Combining opioid substitution therapy with benzodiazepines increases risk of:
- Hypertension
- Respiratory depression and fatal overdose
- Seizure protection
- Improved cognitive function
Correct Answer: Respiratory depression and fatal overdose
Q29. Co-use of alcohol with which class of drugs most increases risk of fatal CNS depression?
- Benzodiazepines
- Stimulants
- Hallucinogens
- SSRIs
Correct Answer: Benzodiazepines
Q30. A proven public health intervention to reduce opioid overdose deaths in communities is:
- Distributing take-home naloxone and training bystanders
- Only increasing prison sentences for users
- Banning opioid substitution therapies
- Prohibiting all opioid prescriptions
Correct Answer: Distributing take-home naloxone and training bystanders
