1|Page
ADVANCED PHARMACOLOGY FINAL EXAM ACTUAL EXAM
2026 | COMPLETE QUESTIONS AND CORRECT ANSWERS |
VERIFIED ANSWERS | 100% CORRECT ALREADY GRADED A+
Q1. A 68-year-old patient on chronic warfarin therapy (stable INR) is started
on trimethoprim-sulfamethoxazole (TMP-SMX) for a urinary tract infection.
Three days later the patient reports bruising; INR is found to be
supratherapeutic. Which pharmacologic mechanism most likely explains the
interaction?
A) TMP-SMX induces hepatic CYP enzymes increasing warfarin
metabolism
B) TMP-SMX displaces warfarin from albumin and inhibits warfarin
metabolism, increasing free warfarin
C) TMP-SMX chelates vitamin K in the gut, reducing warfarin effectiveness
D) TMP-SMX increases gut flora producing more vitamin K, lowering INR
Correct Answer: B) TMP-SMX displaces warfarin from albumin and
inhibits warfarin metabolism, increasing free warfarin.
Rationale: Warfarin is highly protein-bound and metabolized primarily by
CYP2C9 (and other CYPs). TMP-SMX both inhibits CYP enzymes and can
displace warfarin from albumin, increasing the free fraction and reducing
clearance — causing an elevated INR and bleeding risk. Nursing actions:
immediately assess bleeding, hold/adjust warfarin per protocol, check INR
frequently, consider vitamin K if clinically indicated, and notify prescriber.
Why others are wrong: (A) is the opposite (induction would lower warfarin
levels). (C) TMP-SMX does not chelate vitamin K. (D) Antibiotics more
commonly reduce vitamin-K producing flora, which could raise INR — but
TMP-SMX’s dominant mechanisms are CYP inhibition and displacement.
,2|Page
Q2. A hospitalized patient on unfractionated heparin develops a platelet
count drop from 250,000/µL to 80,000/µL on day 6 of therapy and has a
new DVT. What is the correct immediate pharmacologic response?
A) Continue heparin and observe platelets for recovery
B) Stop all heparin products and start a non-heparin parenteral anticoagulant
(e.g., argatroban)
C) Switch to low-molecular-weight heparin (enoxaparin) to avoid HIT
D) Give high-dose intravenous vitamin K
Correct Answer: B) Stop all heparin products and start a non-heparin
parenteral anticoagulant (e.g., argatroban).
Rationale: This presentation is classic heparin-induced thrombocytopenia
(HIT) — >50% platelet drop, timing 5–10 days, and new thrombosis.
Immediate discontinuation of all heparins is required and alternative
anticoagulation with a direct thrombin inhibitor (argatroban, bivalirudin) or
fondaparinux should be started because HIT is prothrombotic. Obtain HIT
antibody (PF4) testing but do not wait for results. Why others are wrong: (A)
would put patient at high thrombotic risk. (C) LMWH still cross-reacts in
HIT and is contraindicated. (D) Vitamin K reverses warfarin, not heparin or
HIT.
Q3. A patient stabilized on lithium for bipolar disorder presents after their
primary care doctor added hydrochlorothiazide (HCTZ) for HTN. Two
weeks later the patient has tremor, confusion, and measured lithium level is
high. What explains this change and the best immediate action?
A) HCTZ increases renal sodium excretion → increased proximal tubule
lithium reabsorption → lithium toxicity; stop HCTZ and check lithium
level/renal function
B) HCTZ reduces lithium absorption in the gut → lowers lithium level;
increase lithium dose
C) HCTZ increases hepatic metabolism of lithium → reduces lithium levels
D) HCTZ causes hypernatremia and dilutional lithium toxicity; give IV free
water
,3|Page
Correct Answer: A) HCTZ increases renal sodium excretion → increased
proximal tubule lithium reabsorption → lithium toxicity; stop HCTZ and
check lithium level/renal function.
Rationale: Lithium is handled like sodium by the kidney. Thiazide diuretics
reduce sodium reabsorption distal to the proximal tubule, triggering
compensatory proximal reabsorption of sodium — and lithium follows
sodium, increasing lithium retention and toxicity. Nursing steps: stop HCTZ
(or hold lithium per prescriber), check lithium level, BMP (renal function,
electrolytes), monitor neuro signs, ensure hydration, and consider activated
charcoal/dialysis for severe toxicity. Why others wrong: (B) and (C) are
false (lithium isn’t hepatically metabolized). (D) describes a wrong
mechanism.
Q4. A patient taking phenelzine (MAOI) eats aged cheese and develops
severe headache, neck stiffness, diaphoresis, and systolic BP 210 mmHg.
Which physiologic process explains this reaction?
A) MAOI prevents breakdown of tyramine → tyramine causes massive
release of norepinephrine → hypertensive crisis
B) MAOI increases serotonin only; this is serotonin syndrome from SSRI
interaction
C) Cheese contains high tyramine which competes with MAOI for renal
excretion causing hypotension
D) MAOI causes anticholinergic effects leading to hyperthermia and
hypertension
Correct Answer: A) MAOI prevents breakdown of tyramine → tyramine
causes massive release of norepinephrine → hypertensive crisis.
Rationale: MAO-A normally deaminates dietary tyramine. MAOI
(phenelzine) blocks MAO, allowing tyramine to accumulate and trigger
massive catecholamine release → hypertensive crisis. Immediate care: lower
BP (IV agents), admit, discontinue MAOI, monitor for intracranial
hemorrhage. Patient education: avoid tyramine-rich foods (aged cheeses,
cured meats, certain beers). Why others wrong: (B) describes serotonin
, 4|Page
syndrome (different features, hyperreflexia, clonus). (C) is incorrect
pharmacology. (D) anticholinergic effects are not the main mechanism here.
Q5. An elderly ICU patient receiving gentamicin develops rising serum
creatinine and tinnitus. What monitoring and prevention strategies should
have been prioritized?
A) Monitor peak levels only; nephrotoxicity is unrelated to trough levels
B) Monitor trough levels and renal function; adjust dosing interval if
creatinine rises; avoid concurrent nephrotoxins (e.g., vancomycin, NSAIDs)
C) Monitor liver function tests; gentamicin causes hepatic injury first
D) No monitoring is required for short courses
Correct Answer: B) Monitor trough levels and renal function; adjust dosing
interval if creatinine rises; avoid concurrent nephrotoxins (e.g., vancomycin,
NSAIDs).
Rationale: Aminoglycosides are nephrotoxic and ototoxic; trough levels
correlate with toxicity risk. Monitoring: baseline and serial creatinine, trough
(and peak for efficacy), and auditory function when indicated. Prolonged
high troughs increase nephrotoxicity. Avoid additive nephrotoxins, use
extended-interval dosing when appropriate, and discontinue on early signs of
toxicity. Why others wrong: (A) troughs are critical. (C) gentamicin affects
kidneys and ears, not liver primarily. (D) even short courses can harm
vulnerable patients.
Q6. A patient receiving high-dose methotrexate for osteosarcoma develops
mucositis and pancytopenia. Why is leucovorin (folinic acid) rescue given
after methotrexate and how does timing matter?
A) Leucovorin enhances methotrexate cytotoxicity and should be given
concurrently
B) Leucovorin bypasses DHFR to rescue normal cells; delayed/leucovorin
omission increases toxicity — timing and levels guide rescue
C) Leucovorin is an antidote that chelates methotrexate and must be given
ADVANCED PHARMACOLOGY FINAL EXAM ACTUAL EXAM
2026 | COMPLETE QUESTIONS AND CORRECT ANSWERS |
VERIFIED ANSWERS | 100% CORRECT ALREADY GRADED A+
Q1. A 68-year-old patient on chronic warfarin therapy (stable INR) is started
on trimethoprim-sulfamethoxazole (TMP-SMX) for a urinary tract infection.
Three days later the patient reports bruising; INR is found to be
supratherapeutic. Which pharmacologic mechanism most likely explains the
interaction?
A) TMP-SMX induces hepatic CYP enzymes increasing warfarin
metabolism
B) TMP-SMX displaces warfarin from albumin and inhibits warfarin
metabolism, increasing free warfarin
C) TMP-SMX chelates vitamin K in the gut, reducing warfarin effectiveness
D) TMP-SMX increases gut flora producing more vitamin K, lowering INR
Correct Answer: B) TMP-SMX displaces warfarin from albumin and
inhibits warfarin metabolism, increasing free warfarin.
Rationale: Warfarin is highly protein-bound and metabolized primarily by
CYP2C9 (and other CYPs). TMP-SMX both inhibits CYP enzymes and can
displace warfarin from albumin, increasing the free fraction and reducing
clearance — causing an elevated INR and bleeding risk. Nursing actions:
immediately assess bleeding, hold/adjust warfarin per protocol, check INR
frequently, consider vitamin K if clinically indicated, and notify prescriber.
Why others are wrong: (A) is the opposite (induction would lower warfarin
levels). (C) TMP-SMX does not chelate vitamin K. (D) Antibiotics more
commonly reduce vitamin-K producing flora, which could raise INR — but
TMP-SMX’s dominant mechanisms are CYP inhibition and displacement.
,2|Page
Q2. A hospitalized patient on unfractionated heparin develops a platelet
count drop from 250,000/µL to 80,000/µL on day 6 of therapy and has a
new DVT. What is the correct immediate pharmacologic response?
A) Continue heparin and observe platelets for recovery
B) Stop all heparin products and start a non-heparin parenteral anticoagulant
(e.g., argatroban)
C) Switch to low-molecular-weight heparin (enoxaparin) to avoid HIT
D) Give high-dose intravenous vitamin K
Correct Answer: B) Stop all heparin products and start a non-heparin
parenteral anticoagulant (e.g., argatroban).
Rationale: This presentation is classic heparin-induced thrombocytopenia
(HIT) — >50% platelet drop, timing 5–10 days, and new thrombosis.
Immediate discontinuation of all heparins is required and alternative
anticoagulation with a direct thrombin inhibitor (argatroban, bivalirudin) or
fondaparinux should be started because HIT is prothrombotic. Obtain HIT
antibody (PF4) testing but do not wait for results. Why others are wrong: (A)
would put patient at high thrombotic risk. (C) LMWH still cross-reacts in
HIT and is contraindicated. (D) Vitamin K reverses warfarin, not heparin or
HIT.
Q3. A patient stabilized on lithium for bipolar disorder presents after their
primary care doctor added hydrochlorothiazide (HCTZ) for HTN. Two
weeks later the patient has tremor, confusion, and measured lithium level is
high. What explains this change and the best immediate action?
A) HCTZ increases renal sodium excretion → increased proximal tubule
lithium reabsorption → lithium toxicity; stop HCTZ and check lithium
level/renal function
B) HCTZ reduces lithium absorption in the gut → lowers lithium level;
increase lithium dose
C) HCTZ increases hepatic metabolism of lithium → reduces lithium levels
D) HCTZ causes hypernatremia and dilutional lithium toxicity; give IV free
water
,3|Page
Correct Answer: A) HCTZ increases renal sodium excretion → increased
proximal tubule lithium reabsorption → lithium toxicity; stop HCTZ and
check lithium level/renal function.
Rationale: Lithium is handled like sodium by the kidney. Thiazide diuretics
reduce sodium reabsorption distal to the proximal tubule, triggering
compensatory proximal reabsorption of sodium — and lithium follows
sodium, increasing lithium retention and toxicity. Nursing steps: stop HCTZ
(or hold lithium per prescriber), check lithium level, BMP (renal function,
electrolytes), monitor neuro signs, ensure hydration, and consider activated
charcoal/dialysis for severe toxicity. Why others wrong: (B) and (C) are
false (lithium isn’t hepatically metabolized). (D) describes a wrong
mechanism.
Q4. A patient taking phenelzine (MAOI) eats aged cheese and develops
severe headache, neck stiffness, diaphoresis, and systolic BP 210 mmHg.
Which physiologic process explains this reaction?
A) MAOI prevents breakdown of tyramine → tyramine causes massive
release of norepinephrine → hypertensive crisis
B) MAOI increases serotonin only; this is serotonin syndrome from SSRI
interaction
C) Cheese contains high tyramine which competes with MAOI for renal
excretion causing hypotension
D) MAOI causes anticholinergic effects leading to hyperthermia and
hypertension
Correct Answer: A) MAOI prevents breakdown of tyramine → tyramine
causes massive release of norepinephrine → hypertensive crisis.
Rationale: MAO-A normally deaminates dietary tyramine. MAOI
(phenelzine) blocks MAO, allowing tyramine to accumulate and trigger
massive catecholamine release → hypertensive crisis. Immediate care: lower
BP (IV agents), admit, discontinue MAOI, monitor for intracranial
hemorrhage. Patient education: avoid tyramine-rich foods (aged cheeses,
cured meats, certain beers). Why others wrong: (B) describes serotonin
, 4|Page
syndrome (different features, hyperreflexia, clonus). (C) is incorrect
pharmacology. (D) anticholinergic effects are not the main mechanism here.
Q5. An elderly ICU patient receiving gentamicin develops rising serum
creatinine and tinnitus. What monitoring and prevention strategies should
have been prioritized?
A) Monitor peak levels only; nephrotoxicity is unrelated to trough levels
B) Monitor trough levels and renal function; adjust dosing interval if
creatinine rises; avoid concurrent nephrotoxins (e.g., vancomycin, NSAIDs)
C) Monitor liver function tests; gentamicin causes hepatic injury first
D) No monitoring is required for short courses
Correct Answer: B) Monitor trough levels and renal function; adjust dosing
interval if creatinine rises; avoid concurrent nephrotoxins (e.g., vancomycin,
NSAIDs).
Rationale: Aminoglycosides are nephrotoxic and ototoxic; trough levels
correlate with toxicity risk. Monitoring: baseline and serial creatinine, trough
(and peak for efficacy), and auditory function when indicated. Prolonged
high troughs increase nephrotoxicity. Avoid additive nephrotoxins, use
extended-interval dosing when appropriate, and discontinue on early signs of
toxicity. Why others wrong: (A) troughs are critical. (C) gentamicin affects
kidneys and ears, not liver primarily. (D) even short courses can harm
vulnerable patients.
Q6. A patient receiving high-dose methotrexate for osteosarcoma develops
mucositis and pancytopenia. Why is leucovorin (folinic acid) rescue given
after methotrexate and how does timing matter?
A) Leucovorin enhances methotrexate cytotoxicity and should be given
concurrently
B) Leucovorin bypasses DHFR to rescue normal cells; delayed/leucovorin
omission increases toxicity — timing and levels guide rescue
C) Leucovorin is an antidote that chelates methotrexate and must be given
