NUR 641E FINAL EXAM (GCU) NEWEST 2026 ACTUAL
EXAM TEST BANK| NUR641E ADVANCED
PATHOPHYSIOLOGY AND PHARMACOLOGY FOR
NURSE EDUCATORS FINAL EXAM REVIEW WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+
A 74-year-old with albumin 2.1 g/dL becomes confused after a usual
total daily dose of phenytoin. The total phenytoin level is reported as
therapeutic. What explains the toxicity?
a) Autoinduction of hepatic metabolism
b) Competitive antagonism at GABA receptors
c) Reduced renal tubular secretion of phenytoin
d) Increased free fraction of a highly protein-bound drug - Correct
Answer - d) Increased free fraction of a highly protein-bound drug
Phenytoin is highly albumin bound. Low albumin can make the
measured total level look acceptable while the active free level is toxic.
A patient taking warfarin starts trimethoprim-sulfamethoxazole for a
urinary infection. Three days later the INR is 5.8. Which concept best
explains this result?
a) Enzyme induction
b) Additive beta blockade
c) Inhibition of warfarin metabolism and vitamin K-producing flora
d) Reduced renal filtration of warfarin - Correct Answer - c) Inhibition
of warfarin metabolism and vitamin K-producing flora
pg. 1
,TMP-SMX can inhibit warfarin metabolism and reduce intestinal
vitamin K contribution. The combined effect increases anticoagulation
and bleeding risk.
A 62-year-old is prescribed clopidogrel after coronary stenting but has
recurrent thrombosis. Genetic testing shows a CYP2C19 loss-of-
function allele. What is the most likely pharmacologic problem?
a) Accelerated renal clearance
b) Poor prodrug activation
c) Irreversible platelet activation
d) Excess active metabolite -Correct Answer- b) Poor prodrug activation
Clopidogrel requires CYP2C19 activation. Loss-of-function variants can
produce inadequate platelet inhibition despite adherence.
A patient with chronic grapefruit intake develops profound bradycardia
and hypotension after a dose increase of a calcium channel blocker.
Which interaction is most likely?
a) Renal alkalinization delaying excretion
b) CYP2D6 induction decreasing drug exposure
c) P-glycoprotein induction in the gut
d) CYP3A4 inhibition increasing drug exposure - Correct Answer - d)
Grapefruit can inhibit intestinal CYP3A4, increasing exposure to
susceptible drugs such as some calcium channel blockers. Higher
exposure increases dose-related toxicity.
An older adult taking zolpidem has two falls and new daytime
confusion. The nurse educator uses this case to teach which
pharmacodynamic principle?
pg. 2
,a) Increased central nervous system sensitivity
b) Reduced receptor sensitivity to sedatives
c) Increased blood-brain barrier exclusion
d) Decreased drug half-life with aging - Correct answer - a) Increased
central nervous system sensitivity
Older adults often have greater CNS sensitivity to sedative-hypnotics,
even at usual doses. Falls, delirium, and impaired psychomotor function
are key safety concerns.
A pregnant patient with rheumatoid arthritis asks about continuing
methotrexate. Which response is most appropriate?
a) Continue if folic acid is added
b) Switch to live vaccine prophylaxis
c) Stop; it is teratogenic
d) Continue; fetal exposure is minimal - Correct answer - c) Stop; it is
teratogenic
Methotrexate is a folate antagonist and is teratogenic. It should not be
used in pregnancy, and contraception counseling is essential when it is
prescribed.
A patient on chronic prednisone abruptly stops the drug and presents
with weakness, abdominal pain, hypotension, and hyponatremia. What is
the priority medication concept?
a) Beta receptor upregulation
b) Adrenal suppression
c) Rebound thyrotoxicosis
d) Cholinergic crisis - Correct answer - b) Adrenal suppression
pg. 3
, Chronic glucocorticoids suppress the hypothalamic-pituitary-adrenal
axis. Abrupt withdrawal can cause adrenal crisis, requiring steroid
replacement and supportive care.
A patient treated with linezolid while taking sertraline develops
agitation, diaphoresis, diarrhea, hyperreflexia, and clonus. Which
diagnosis is most likely?
a) Neuroleptic malignant syndrome
b) Malignant hyperthermia
c) Acute dystonia
d) Serotonin syndrome - Correct answer - d) Serotonin syndrome
Serotonin syndrome causes neuromuscular hyperactivity, autonomic
instability, and mental status changes. Linezolid has monoamine oxidase
inhibitor activity and can interact with SSRIs.
A patient exposed to an organophosphate pesticide has salivation,
lacrimation, bronchorrhea, bradycardia, and pinpoint pupils. Which
medication directly treats the muscarinic excess?
a) Atropine
b) Flumazenil
c) Dantrolene
d) Naloxone - Correct Answer - a) Atropine
Atropine blocks muscarinic receptors and treats life-threatening
secretions and bradycardia. Pralidoxime may also be used to reactivate
acetylcholinesterase before aging occurs.
A patient with myasthenia gravis becomes weaker after receiving
gentamicin. Which explanation should the educator emphasize?
pg. 4
EXAM TEST BANK| NUR641E ADVANCED
PATHOPHYSIOLOGY AND PHARMACOLOGY FOR
NURSE EDUCATORS FINAL EXAM REVIEW WITH
COMPLETE REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS/ ALREADY GRADED A+
A 74-year-old with albumin 2.1 g/dL becomes confused after a usual
total daily dose of phenytoin. The total phenytoin level is reported as
therapeutic. What explains the toxicity?
a) Autoinduction of hepatic metabolism
b) Competitive antagonism at GABA receptors
c) Reduced renal tubular secretion of phenytoin
d) Increased free fraction of a highly protein-bound drug - Correct
Answer - d) Increased free fraction of a highly protein-bound drug
Phenytoin is highly albumin bound. Low albumin can make the
measured total level look acceptable while the active free level is toxic.
A patient taking warfarin starts trimethoprim-sulfamethoxazole for a
urinary infection. Three days later the INR is 5.8. Which concept best
explains this result?
a) Enzyme induction
b) Additive beta blockade
c) Inhibition of warfarin metabolism and vitamin K-producing flora
d) Reduced renal filtration of warfarin - Correct Answer - c) Inhibition
of warfarin metabolism and vitamin K-producing flora
pg. 1
,TMP-SMX can inhibit warfarin metabolism and reduce intestinal
vitamin K contribution. The combined effect increases anticoagulation
and bleeding risk.
A 62-year-old is prescribed clopidogrel after coronary stenting but has
recurrent thrombosis. Genetic testing shows a CYP2C19 loss-of-
function allele. What is the most likely pharmacologic problem?
a) Accelerated renal clearance
b) Poor prodrug activation
c) Irreversible platelet activation
d) Excess active metabolite -Correct Answer- b) Poor prodrug activation
Clopidogrel requires CYP2C19 activation. Loss-of-function variants can
produce inadequate platelet inhibition despite adherence.
A patient with chronic grapefruit intake develops profound bradycardia
and hypotension after a dose increase of a calcium channel blocker.
Which interaction is most likely?
a) Renal alkalinization delaying excretion
b) CYP2D6 induction decreasing drug exposure
c) P-glycoprotein induction in the gut
d) CYP3A4 inhibition increasing drug exposure - Correct Answer - d)
Grapefruit can inhibit intestinal CYP3A4, increasing exposure to
susceptible drugs such as some calcium channel blockers. Higher
exposure increases dose-related toxicity.
An older adult taking zolpidem has two falls and new daytime
confusion. The nurse educator uses this case to teach which
pharmacodynamic principle?
pg. 2
,a) Increased central nervous system sensitivity
b) Reduced receptor sensitivity to sedatives
c) Increased blood-brain barrier exclusion
d) Decreased drug half-life with aging - Correct answer - a) Increased
central nervous system sensitivity
Older adults often have greater CNS sensitivity to sedative-hypnotics,
even at usual doses. Falls, delirium, and impaired psychomotor function
are key safety concerns.
A pregnant patient with rheumatoid arthritis asks about continuing
methotrexate. Which response is most appropriate?
a) Continue if folic acid is added
b) Switch to live vaccine prophylaxis
c) Stop; it is teratogenic
d) Continue; fetal exposure is minimal - Correct answer - c) Stop; it is
teratogenic
Methotrexate is a folate antagonist and is teratogenic. It should not be
used in pregnancy, and contraception counseling is essential when it is
prescribed.
A patient on chronic prednisone abruptly stops the drug and presents
with weakness, abdominal pain, hypotension, and hyponatremia. What is
the priority medication concept?
a) Beta receptor upregulation
b) Adrenal suppression
c) Rebound thyrotoxicosis
d) Cholinergic crisis - Correct answer - b) Adrenal suppression
pg. 3
, Chronic glucocorticoids suppress the hypothalamic-pituitary-adrenal
axis. Abrupt withdrawal can cause adrenal crisis, requiring steroid
replacement and supportive care.
A patient treated with linezolid while taking sertraline develops
agitation, diaphoresis, diarrhea, hyperreflexia, and clonus. Which
diagnosis is most likely?
a) Neuroleptic malignant syndrome
b) Malignant hyperthermia
c) Acute dystonia
d) Serotonin syndrome - Correct answer - d) Serotonin syndrome
Serotonin syndrome causes neuromuscular hyperactivity, autonomic
instability, and mental status changes. Linezolid has monoamine oxidase
inhibitor activity and can interact with SSRIs.
A patient exposed to an organophosphate pesticide has salivation,
lacrimation, bronchorrhea, bradycardia, and pinpoint pupils. Which
medication directly treats the muscarinic excess?
a) Atropine
b) Flumazenil
c) Dantrolene
d) Naloxone - Correct Answer - a) Atropine
Atropine blocks muscarinic receptors and treats life-threatening
secretions and bradycardia. Pralidoxime may also be used to reactivate
acetylcholinesterase before aging occurs.
A patient with myasthenia gravis becomes weaker after receiving
gentamicin. Which explanation should the educator emphasize?
pg. 4
