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DSST Substance Abuse study materials
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DSST Substance Abuse practice questions

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Question 1Substances (e.g., anabolic steroids, over-the-counter medications)

Which anabolic-androgenic steroid effect is most consistently linked to the development of gynecomastia in males?

  1. Inhibition of luteinizing hormone release
  2. Direct blockade of androgen receptors
  3. Aromatization into estradiol Correct answer.
  4. Conversion into dihydrotestosterone

Explanation

Aromatase converts exogenous androgens such as testosterone into estradiol, and rising estrogen stimulates breast tissue in men. This aromatization pathway is the classic mechanism behind steroid-related gynecomastia, which is why aromatase inhibitors are sometimes misused alongside these drugs.

Question 2Substances (e.g., anabolic steroids, over-the-counter medications)

A 24-year-old bodybuilder using intramuscular testosterone suddenly develops jaundice and markedly elevated transaminases. Which additional class of drug is the most likely contributor to this hepatic injury?

  1. Oral 17-alpha-alkylated steroids Correct answer.
  2. Selective estrogen receptor modulators
  3. Injectable testosterone enanthate
  4. Human chorionic gonadotropin

Explanation

Oral anabolic steroids alkylated at the 17-alpha position resist first-pass metabolism but are hepatotoxic and are associated with cholestatic jaundice and peliosis hepatis. Injectable esters largely bypass this hepatic stress, so the oral component is the likely culprit.

Question 3Substances (e.g., anabolic steroids, over-the-counter medications)

Which finding on a blood panel is most characteristic of chronic anabolic steroid use in a male?

  1. Elevated LH with elevated testosterone
  2. Elevated FSH with normal testosterone
  3. Normal gonadotropins with elevated SHBG
  4. Suppressed LH and FSH with low endogenous testosterone Correct answer.

Explanation

Exogenous androgens feed back on the hypothalamus and pituitary, suppressing gonadotropin release and shutting down endogenous testosterone production. This axis suppression explains testicular atrophy and post-cycle hypogonadism.

Question 4Substances (e.g., anabolic steroids, over-the-counter medications)

Which adverse effect is most strongly associated with chronic anabolic steroid use in women?

  1. Hyperkalemia with cardiac arrhythmia
  2. Hemolytic anemia
  3. Virilization with clitoromegaly and voice deepening Correct answer.
  4. Osteoporosis with fracture

Explanation

Androgenic effects in women include hirsutism, acne, clitoromegaly, and irreversible voice deepening. Some virilizing changes persist after the drug is stopped, which makes them clinically important counseling points.

Question 5Substances (e.g., anabolic steroids, over-the-counter medications)

Which statement best describes the legal status of anabolic steroids in the United States?

  1. They are Schedule I drugs with no accepted medical use
  2. They are unscheduled and sold freely as dietary supplements
  3. They are available only through hospital pharmacies
  4. They are Schedule III controlled substances requiring a prescription Correct answer.

Explanation

Anabolic steroids are Schedule III controlled substances under federal law, and possession without a valid prescription is illegal. They do have legitimate medical uses, which is why they are not Schedule I.

Question 6Substances (e.g., anabolic steroids, over-the-counter medications)

A patient using a prohormone supplement reports fatigue and dark urine. Which supplement ingredient is most concerning for hepatotoxicity?

  1. Branched-chain amino acids
  2. Whey protein isolate
  3. Creatine monohydrate
  4. Methylated anabolic prohormones Correct answer.

Explanation

Methylated prohormones are structurally related to oral anabolic steroids and carry similar hepatotoxic risk. Creatine, whey, and BCAAs are not associated with cholestatic liver injury.

Question 7Substances (e.g., anabolic steroids, over-the-counter medications)

Which over-the-counter analgesic is most often implicated in intentional overdose and acute hepatic failure?

  1. Ibuprofen
  2. Acetaminophen Correct answer.
  3. Diphenhydramine
  4. Aspirin

Explanation

Acetaminophen overdose depletes glutathione, allowing the toxic metabolite NAPQI to accumulate and cause centrilobular hepatic necrosis. N-acetylcysteine replenishes glutathione and is the antidote.

Question 8Substances (e.g., anabolic steroids, over-the-counter medications)

A patient taking high-dose acetaminophen for chronic pain also drinks alcohol heavily. Why is this combination especially dangerous?

  1. Alcohol competitively blocks acetaminophen absorption
  2. Alcohol induces CYP2E1, increasing toxic NAPQI formation Correct answer.
  3. Alcohol increases renal clearance of acetaminophen
  4. Alcohol inhibits glucuronidation of acetaminophen

Explanation

Chronic alcohol use induces CYP2E1, which shunts more acetaminophen toward the toxic NAPQI pathway while also depleting glutathione stores. This raises the risk of liver injury even at doses that would otherwise be safe.

Question 9Substances (e.g., anabolic steroids, over-the-counter medications)

Which over-the-counter medication is most appropriate to flag for a patient with a history of peptic ulcer disease?

  1. Ibuprofen Correct answer.
  2. Acetaminophen
  3. Oral rehydration salts
  4. Topical lidocaine

Explanation

NSAIDs such as ibuprofen inhibit cyclooxygenase and reduce protective prostaglandins in the gastric mucosa, increasing ulcer risk and bleeding. Acetaminophen lacks this gastric effect and is generally preferred in ulcer history.

Question 10Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC cough preparation carries risk of serotonin syndrome when combined with an SSRI antidepressant?

  1. Saline nasal spray
  2. Dextromethorphan Correct answer.
  3. Benzocaine lozenges
  4. Guaifenesin

Explanation

Dextromethorphan inhibits serotonin reuptake and can precipitate serotonin syndrome when combined with SSRIs or MAOIs. This interaction is a key reason to screen OTC cough products in patients on antidepressants.

Question 11Substances (e.g., anabolic steroids, over-the-counter medications)

Pseudoephedrine is regulated behind the pharmacy counter primarily because it can be used to synthesize which substance?

  1. Methamphetamine Correct answer.
  2. Cocaine
  3. LSD
  4. Heroin

Explanation

Pseudoephedrine is a precursor that can be reduced to methamphetamine, which led to federal sales restrictions and log requirements. This is why many cold products now use phenylephrine instead.

Question 12Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC antihistamine is most associated with anticholinergic delirium in older adults?

  1. Diphenhydramine Correct answer.
  2. Fluticasone nasal spray
  3. Cetirizine
  4. Loratadine

Explanation

First-generation antihistamines such as diphenhydramine cross the blood-brain barrier and have strong anticholinergic effects, causing confusion, urinary retention, and falls in older adults. Second-generation agents are preferred for this reason.

Question 13Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC product is most likely to cause rebound congestion with prolonged use?

  1. Petroleum jelly nasal ointment
  2. Intranasal cromolyn
  3. Saline nasal spray
  4. Oxymetazoline nasal spray Correct answer.

Explanation

Topical decongestants such as oxymetazoline cause vasoconstriction followed by rebound vasodilation, leading to rhinitis medicamentosa when used beyond a few days. Limiting use to about three days prevents this cycle.

Question 14Substances (e.g., anabolic steroids, over-the-counter medications)

A patient presents with hypertension and asks about an OTC cold remedy. Which ingredient should be avoided?

  1. Acetaminophen
  2. Guaifenesin
  3. Phenylephrine Correct answer.
  4. Dextromethorphan

Explanation

Phenylephrine is an alpha-adrenergic agonist that raises blood pressure and can worsen hypertension. Decongestants as a class warrant caution in patients with cardiovascular disease.

Question 15Substances (e.g., anabolic steroids, over-the-counter medications)

Which supplement is a common adulterant in weight-loss products and has been associated with cardiovascular events?

  1. Sibutramine Correct answer.
  2. Folic acid
  3. Vitamin D
  4. Calcium carbonate

Explanation

Sibutramine was withdrawn from the market because of cardiovascular risks but continues to appear as an adulterant in some weight-loss supplements. Its presence is a signature of contaminated or fraudulent products.

Question 16Substances (e.g., anabolic steroids, over-the-counter medications)

Which anabolic steroid is commonly used therapeutically to treat hereditary angioedema?

  1. Nandrolone decanoate
  2. Oxandrolone
  3. Danazol Correct answer.
  4. Stanozolol

Explanation

Danazol is an attenuated androgen that increases C1 esterase inhibitor levels and is used for prophylaxis of hereditary angioedema attacks. Its androgenic side effects reflect the class.

Question 17Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC medication should be avoided in a patient taking warfarin because of increased bleeding risk?

  1. Saline nasal spray
  2. Acetaminophen at low doses
  3. Aspirin Correct answer.
  4. Topical hydrocortisone

Explanation

Aspirin inhibits platelet aggregation and also displaces warfarin from protein binding, increasing bleeding risk. Patients on warfarin are generally advised to avoid aspirin-containing OTC products unless specifically directed.

Question 18Substances (e.g., anabolic steroids, over-the-counter medications)

Which substance is classified as a Schedule II stimulant with a high potential for abuse but accepted medical use?

  1. Nicotine
  2. Methylphenidate Correct answer.
  3. Caffeine
  4. Pseudoephedrine

Explanation

Methylphenidate is a Schedule II controlled substance because of its high abuse potential, yet it has accepted medical use for ADHD and narcolepsy. Caffeine, nicotine, and pseudoephedrine are not Schedule II.

Question 19Substances (e.g., anabolic steroids, over-the-counter medications)

A bodybuilder stops a long course of injectable testosterone and reports profound fatigue and low libido. Which explanation best fits this presentation?

  1. Acute estrogen withdrawal from aromatase inhibition
  2. Suppressed endogenous testosterone from prolonged feedback inhibition Correct answer.
  3. Allergic reaction to the injection vehicle
  4. Permanent destruction of Leydig cells from the injections

Explanation

Prolonged exogenous androgen exposure suppresses the hypothalamic-pituitary-gonadal axis, so endogenous testosterone production lags after cessation. Recovery can take months and is the basis of post-cycle hypogonadism.

Question 20Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC laxative is most associated with electrolyte disturbance and dependence with chronic use?

  1. Stool softeners such as docusate
  2. Bulk-forming laxatives such as psyllium
  3. Stimulant laxatives such as bisacodyl Correct answer.
  4. Osmotic laxatives such as polyethylene glycol

Explanation

Chronic stimulant laxative use can lead to hypokalemia, metabolic alkalosis, and a dependency in which the bowel becomes reliant on the drug. Bulk-forming and osmotic agents are safer for long-term use.

Question 21Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC product is a recognized cause of serotonin syndrome when combined with a monoamine oxidase inhibitor?

  1. Artificial sweeteners
  2. Loperamide at label doses
  3. Calcium carbonate
  4. Dextromethorphan Correct answer.

Explanation

Dextromethorphan has serotonergic activity, and MAOIs block its metabolism, leading to dangerous serotonin accumulation. This combination is a well-documented cause of serotonin syndrome.

Question 22Substances (e.g., anabolic steroids, over-the-counter medications)

Which ingredient in an OTC sleep aid is an antihistamine that can cause next-day sedation and anticholinergic effects?

  1. Magnesium citrate
  2. Melatonin
  3. Doxylamine Correct answer.
  4. Valerian root

Explanation

Doxylamine is a first-generation antihistamine used as a sleep aid and can cause residual sedation, dry mouth, and confusion. Its anticholinergic profile makes it problematic in older adults.

Question 23Substances (e.g., anabolic steroids, over-the-counter medications)

Which statement about anabolic steroid use and cardiovascular risk is most accurate?

  1. They can lower HDL and raise blood pressure, increasing cardiac risk Correct answer.
  2. They reliably lower blood pressure and improve lipid profiles
  3. They reduce the risk of cardiomyopathy
  4. They have no measurable effect on lipids

Explanation

Anabolic steroids reduce HDL cholesterol, raise blood pressure, and promote left ventricular hypertrophy, all of which increase cardiovascular risk. These effects can occur even in young athletes.

Question 24Substances (e.g., anabolic steroids, over-the-counter medications)

A patient reports using a 'natural' bodybuilding supplement that was later found to contain a synthetic steroid. Which regulatory issue does this illustrate?

  1. Supplements are tested for adulteration before sale
  2. Dietary supplements are not pre-approved for safety before marketing Correct answer.
  3. Supplements are classified as Schedule III drugs
  4. The FDA approves each supplement's ingredients in advance

Explanation

Under current U.S. law, dietary supplements do not require premarket safety approval, so adulteration with undeclared steroids can reach consumers. Post-market surveillance is the main safeguard.

Question 25Substances (e.g., anabolic steroids, over-the-counter medications)

Which OTC antacid ingredient can cause constipation and is also used as a calcium supplement?

  1. Aluminum hydroxide
  2. Sodium bicarbonate
  3. Calcium carbonate Correct answer.
  4. Magnesium hydroxide

Explanation

Calcium carbonate neutralizes acid and is used as a calcium supplement, but it commonly causes constipation and can cause hypercalcemia with excessive use. Magnesium-containing antacids tend to have the opposite effect.

Question 26Substances (e.g., anabolic steroids, over-the-counter medications)

A patient asks about using an over-the-counter product containing the decongestant pseudoephedrine to manage nasal congestion. Which risk is most relevant to counsel about in a patient with uncontrolled hypertension?

  1. Anticholinergic urinary retention and dry mouth
  2. Reduction of the international normalized ratio with chronic use
  3. Profound central nervous system depression with respiratory slowing
  4. Sympathomimetic vasoconstriction that can raise blood pressure and heart rate Correct answer.

Explanation

Pseudoephedrine is a sympathomimetic amine that causes vasoconstriction and can elevate blood pressure and heart rate, so it is generally avoided in uncontrolled hypertension. The other listed effects belong to different drug classes and are not characteristic of pseudoephedrine.

Question 27Substances (e.g., anabolic steroids, over-the-counter medications)

Which over-the-counter agent is a recognized cause of hepatotoxicity because it depletes glutathione and forms a toxic metabolite when taken in excessive amounts?

  1. Loperamide
  2. Calcium carbonate
  3. Acetaminophen Correct answer.
  4. Diphenhydramine

Explanation

Acetaminophen overdose overwhelms normal conjugation pathways, shunting the drug to a reactive metabolite that depletes hepatic glutathione and causes centrilobular necrosis. N-acetylcysteine replenishes glutathione and is the antidote. The other agents listed do not share this mechanism.

Question 28Substances (e.g., anabolic steroids, over-the-counter medications)

A patient taking a monoamine oxidase inhibitor asks which over-the-counter cough remedy must be avoided because of the risk of hypertensive crisis.

  1. Saline nasal spray
  2. Dextromethorphan-containing cough syrup Correct answer.
  3. Guaifenesin-containing expectorant
  4. Honey-based throat lozenge

Explanation

Dextromethorphan inhibits serotonin reuptake and, combined with a monoamine oxidase inhibitor, can precipitate serotonin syndrome; sympathomimetic cough preparations can also trigger hypertensive crisis. Guaifenesin, honey lozenges, and saline spray lack this interaction.

Question 29Substances (e.g., anabolic steroids, over-the-counter medications)

Which over-the-counter ingredient is an antihistamine that is included in many sleep aids and can cause next-day sedation, dry mouth, and confusion in older adults?

  1. Diphenhydramine Correct answer.
  2. Bismuth subsalicylate
  3. Pseudoephedrine
  4. Guaifenesin

Explanation

Diphenhydramine is a first-generation antihistamine with strong central and anticholinergic effects, making it a common sleep-aid ingredient that causes next-day sedation and confusion, especially in older adults. The other listed ingredients are a decongestant, an expectorant, and a gastrointestinal agent.

Question 30Substances (e.g., anabolic steroids, over-the-counter medications)

An adolescent presents with severe acne, gynecomastia, and stunted linear growth, and admits to using an anabolic steroid obtained from a gym acquaintance. Which explanation best accounts for the growth finding?

  1. Exogenous androgen directly suppresses pituitary growth hormone secretion
  2. Exogenous androgen increases thyroid hormone clearance
  3. Exogenous androgen prematurely closes the epiphyseal growth plates Correct answer.
  4. Exogenous androgen causes renal wasting of calcium and phosphate

Explanation

Exogenous androgens accelerate skeletal maturation and premature epiphyseal closure, which limits final adult height even though they may initially increase growth velocity. The other mechanisms do not explain the stunting observed with anabolic steroid use in adolescents.

Question 31Substances (e.g., anabolic steroids, over-the-counter medications)

A weightlifter using intramuscular testosterone reports new-onset hypertension and lower extremity edema. Which mechanism most directly explains the fluid retention associated with anabolic steroid use?

  1. Direct inhibition of antidiuretic hormone release
  2. Reduced renal perfusion from androgen-induced nephrotoxicity
  3. Primary aldosterone deficiency induced by androgens
  4. Androgen-mediated sodium and water retention with increased erythropoiesis Correct answer.

Explanation

Anabolic steroids promote sodium and water retention and stimulate erythropoiesis, both of which can raise blood pressure and cause edema. The other mechanisms are not established effects of androgens and would not explain the presentation.

Question 32Substances (e.g., anabolic steroids, over-the-counter medications)

A patient who has been using a bodybuilding supplement develops jaundice and markedly elevated transaminases. The product was later found to contain a synthetic anabolic steroid. Which finding best supports a hepatotoxic mechanism of this class?

  1. Cholestatic hepatitis with elevated bilirubin and alkaline phosphatase Correct answer.
  2. Acute pancreatitis with elevated lipase
  3. Interstitial nephritis with eosinophiluria
  4. Hemolytic anemia with low haptoglobin

Explanation

Anabolic steroids, particularly orally active 17-alpha-alkylated agents, are associated with cholestatic hepatitis and peliosis hepatis. The pattern of elevated bilirubin and alkaline phosphatase with jaundice fits this class effect. The other findings reflect different organ toxicities.

Question 33Substances (e.g., anabolic steroids, over-the-counter medications)

A patient taking a prescribed stimulant for attention-deficit/hyperactivity disorder asks whether an over-the-counter cold product containing pseudoephedrine is safe to add. Which concern is most appropriate to discuss?

  1. Reduced stimulant absorption from gastric alkalinization
  2. Induction of cytochrome P450 enzymes that lowers stimulant levels
  3. Additive sedation that may impair driving
  4. Additive sympathomimetic effects that may increase blood pressure and heart rate Correct answer.

Explanation

Both prescription stimulants and pseudoephedrine have sympathomimetic activity, so combining them can produce additive cardiovascular stimulation. The other options describe effects that are not characteristic of this combination.

Question 34Substances (e.g., anabolic steroids, over-the-counter medications)

A patient with chronic constipation has used an over-the-counter stimulant laxative daily for years and now reports muscle weakness and palpitations. Which electrolyte disturbance is most likely?

  1. Hypocalcemia from binding of dietary calcium
  2. Hypokalemia from chronic laxative-induced diarrhea Correct answer.
  3. Hypernatremia from osmotic water loss
  4. Hyperkalemia from potassium-sparing laxative effects

Explanation

Chronic stimulant laxative use causes fluid and potassium loss through diarrhea, leading to hypokalemia that can produce weakness and dysrhythmias. Laxatives do not spare potassium, load sodium, or bind calcium in a way that explains this presentation.

Question 35Substances (e.g., anabolic steroids, over-the-counter medications)

A patient using a 'natural' bodybuilding supplement develops gynecomastia, testicular atrophy, and suppressed luteinizing hormone. The product is suspected to contain an undeclared synthetic androgen. Which interpretation is most accurate?

  1. Suppressed luteinizing hormone confirms primary testicular failure rather than exogenous androgen use
  2. Exogenous androgen suppresses the hypothalamic-pituitary-gonadal axis, lowering endogenous testosterone production Correct answer.
  3. The supplement directly stimulates luteinizing hormone secretion, causing testicular enlargement
  4. Gynecomastia indicates excess estrogen replacement rather than androgen exposure

Explanation

Exogenous androgens provide negative feedback that suppresses gonadotropin-releasing hormone and luteinizing hormone, reducing endogenous testosterone production and causing testicular atrophy; some androgen is aromatized to estrogen, contributing to gynecomastia. This pattern points to exogenous androgen exposure rather than primary testicular failure.

Question 36Substances (e.g., anabolic steroids, over-the-counter medications)

Which over-the-counter analgesic is most strongly associated with Reye syndrome when given to children during a viral illness?

  1. Acetaminophen
  2. Aspirin Correct answer.
  3. Ibuprofen
  4. Naproxen

Explanation

Aspirin use during viral illnesses such as influenza or varicella in children is associated with Reye syndrome, a rare but serious encephalopathy with hepatic dysfunction. Acetaminophen and nonsteroidal anti-inflammatory drugs are preferred alternatives in this setting.

Question 37Substances (e.g., anabolic steroids, over-the-counter medications)

A patient with asthma asks about an over-the-counter nonsteroidal anti-inflammatory drug for headache. Which risk is most relevant to discuss?

  1. Rebound congestion from alpha-adrenergic stimulation
  2. Serotonin syndrome from monoamine oxidase inhibition
  3. Bronchoconstriction from aspirin-exacerbated respiratory disease Correct answer.
  4. Profound sedation from antihistamine content

Explanation

Some patients with asthma, particularly those with nasal polyps, have aspirin-exacerbated respiratory disease and can develop bronchospasm after nonsteroidal anti-inflammatory drugs. The other options describe effects of unrelated drug classes.

Question 38Substances (e.g., anabolic steroids, over-the-counter medications)

A patient with heart failure asks which over-the-counter product should be avoided because it promotes fluid retention and may worsen symptoms.

  1. Guaifenesin
  2. Saline nasal spray
  3. Acetaminophen
  4. Ibuprofen Correct answer.

Explanation

Nonsteroidal anti-inflammatory drugs such as ibuprofen cause sodium and water retention and can blunt diuretic effects, potentially worsening heart failure. Acetaminophen, guaifenesin, and saline spray do not carry this risk.

Question 39Substances (e.g., anabolic steroids, over-the-counter medications)

A patient reports taking high-dose vitamin A supplements for acne and now has headache, blurred vision, and elevated intracranial pressure. Which explanation best accounts for these findings?

  1. Vitamin A deficiency causing night blindness and corneal changes
  2. Vitamin A acting as a diuretic and causing hypovolemic shock
  3. Excess vitamin A causing acute hepatic necrosis with encephalopathy
  4. Hypervitaminosis A causing pseudotumor cerebri with increased intracranial pressure Correct answer.

Explanation

Chronic excessive vitamin A intake can produce pseudotumor cerebri with headache, papilledema, and blurred vision, along with other toxicity findings. The presentation reflects increased intracranial pressure rather than deficiency, hepatic necrosis, or hypovolemia.

Question 40Substances (e.g., anabolic steroids, over-the-counter medications)

A patient using a topical corticosteroid cream for eczema also applies an over-the-counter hydrocortisone product to the same area and develops thinning of the skin. Which principle best explains this finding?

  1. Corticosteroid creams cause contact dermatitis that mimics atrophy
  2. Additive topical glucocorticoid exposure suppresses collagen synthesis and causes skin atrophy Correct answer.
  3. Hydrocortisone increases sebum production and causes acneiform thickening
  4. Topical corticosteroids stimulate fibroblast proliferation and thicken the dermis

Explanation

Combining topical corticosteroid products increases local glucocorticoid exposure, which inhibits collagen synthesis and causes epidermal and dermal atrophy. The other options describe effects opposite to or different from the known actions of topical corticosteroids.

Question 41Dependency/addiction

Which term describes the physiological state in which stopping a drug produces a predictable, drug-specific set of symptoms?

  1. Tolerance
  2. Physical dependence Correct answer.
  3. Drug craving
  4. Psychological dependence

Explanation

Physical dependence is defined by the emergence of a characteristic withdrawal syndrome when a drug is stopped or an antagonist is given. It is distinct from craving and from tolerance, which involves reduced response at a given dose.

Question 42Dependency/addiction

A patient's seizures and autonomic instability after abrupt alcohol cessation are best explained by which neuroadaptive change?

  1. Selective loss of dopamine D2 receptors in the striatum
  2. Increased endogenous opioid release in the periaqueductal gray
  3. Enhanced serotonin reuptake during withdrawal
  4. Upregulation of excitatory NMDA signaling with reduced inhibitory GABA activity Correct answer.

Explanation

Chronic alcohol enhances inhibitory GABA-A activity and suppresses excitatory NMDA transmission. The brain compensates, so on withdrawal the unopposed excitation produces tremor, seizures, and autonomic hyperactivity.

Question 43Dependency/addiction

In the DSM-5-TR criteria for substance use disorder, which pair of features counts toward the diagnosis?

  1. Craving and family history
  2. Tolerance and denial
  3. Denial and craving
  4. Tolerance and withdrawal Correct answer.

Explanation

Tolerance and withdrawal are each recognized criteria among the eleven listed for substance use disorder. Denial and family history are clinically relevant but are not among the diagnostic criteria themselves.

Question 44Dependency/addiction

Which pattern of use most closely matches the DSM-5-TR descriptor 'in remission' for a substance use disorder?

  1. Occasional use without any criteria for one month
  2. Complete abstinence for at least five years
  3. No criteria met for at least three months but less than twelve months Correct answer.
  4. Continued use with fewer than two criteria for six months

Explanation

Early remission denotes meeting no criteria, apart from craving, for at least three but fewer than twelve months. Sustained remission requires twelve months or longer, so a five-year abstinence would be sustained remission.

Question 45Dependency/addiction

A person who needs progressively larger doses of a sedative to achieve the original effect is demonstrating which phenomenon?

  1. Physical withdrawal
  2. Sensitization
  3. Pharmacodynamic tolerance Correct answer.
  4. Drug antagonism

Explanation

Pharmacodynamic tolerance is a reduced response to the same concentration of drug at the receptor or cellular level, requiring higher doses for the same effect. It is distinct from withdrawal and from sensitization, which is an increased response.

Question 46Dependency/addiction

Which statement best distinguishes craving from compulsion in addiction?

  1. Craving occurs only during withdrawal, while compulsion occurs only during intoxication
  2. Craving is a physical sign, while compulsion is a legal concept
  3. Craving applies to alcohol, while compulsion applies to stimulants
  4. Craving is an intense desire to use, while compulsion is a diminished control over whether to use Correct answer.

Explanation

Craving refers to strong urges or desires to use a substance, whereas compulsion reflects impaired control or a sense of being driven to use. Both are separable constructs and neither is tied to a specific drug class.

Question 47Dependency/addiction

The mesolimbic dopamine pathway, which is central to drug reward, projects primarily from which structure to the nucleus accumbens?

  1. Substantia nigra pars compacta
  2. Ventral tegmental area Correct answer.
  3. Raphe nuclei
  4. Locus coeruleus

Explanation

Dopamine neurons in the ventral tegmental area project to the nucleus accumbens and other limbic targets, forming the reward pathway. The substantia nigra projects mainly to the striatum, whereas the locus coeruleus and raphe nuclei are noradrenergic and serotonergic.

Question 48Dependency/addiction

A patient on long-term high-dose opioids reports that the same dose no longer relieves pain and produces less euphoria. Which mechanism most likely explains this?

  1. Receptor downregulation and reduced coupling efficiency Correct answer.
  2. Increased hepatic first-pass metabolism of the drug
  3. Development of an autoimmune response to the drug
  4. Reduced absorption from the gastrointestinal tract

Explanation

Sustained opioid exposure desensitizes and downregulates mu-opioid receptors and reduces signal transduction, producing tolerance to analgesic and euphoric effects. Metabolic and absorption changes could alter levels but do not explain the pharmacodynamic loss of response.

Question 49Dependency/addiction

Which statement about cross-tolerance is accurate?

  1. Tolerance to one drug always confers immunity to all other drug classes
  2. Cross-tolerance means a drug becomes more potent after repeated use
  3. Cross-tolerance occurs only with illicit substances
  4. Tolerance to one drug can reduce responsiveness to another drug in the same class Correct answer.

Explanation

Cross-tolerance arises when drugs share a mechanism, so tolerance to one reduces the effect of another, as seen among alcohol, benzodiazepines, and barbiturates. It is mechanism-dependent and does not generalize to unrelated classes.

Question 50Dependency/addiction

The term 'kindling' in alcohol withdrawal refers to which observation?

  1. Each withdrawal episode becomes milder with repetition
  2. Repeated withdrawal episodes progressively worsen subsequent withdrawal severity Correct answer.
  3. Withdrawal occurs only after the first detoxification
  4. Withdrawal symptoms are unrelated to prior episodes

Explanation

Kindling describes the finding that repeated episodes of alcohol withdrawal are associated with increasingly severe symptoms, including heightened seizure risk. This supports careful, repeated medical management of withdrawal.