**TEST BANK FOR ADVANCED
PHARMACOLOGY**
**WEEK 11 EXAM**100 MULTIPLE-CHOICE
QUESTIONS + ANSWERS & DETAILED
RATIONALES**HIGH-YIELD CONTENT •
GRADUATE-LEVEL • FIRST-TIME PASS** 2026–
2027 ACADEMIC YEAR**
# SECTION 1: ANTICOAGULATION & ANTIPLATELET THERAPY
(Questions 1–20)
**1. A 68-year-old patient with atrial fibrillation (CHA₂DS₂-VASc score
of 5) is started on warfarin. What is the target INR range for this
patient?**
A) 1.5–2.0
B) 2.0–3.0
C) 2.5–3.5
D) 3.0–4.0
**Answer: B**
*Rationale:* For non-valvular atrial fibrillation, target INR is 2.0–3.0
(range 2.5 is ideal). Mechanical heart valves require 2.5–3.5.
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**2. A patient on apixaban (Eliquis) for DVT prophylaxis presents with
acute gastrointestinal bleeding. Which reversal agent is most
appropriate?**
A) Vitamin K
B) Protamine sulfate
C) Andexanet alfa
D) Idarucizumab
**Answer: C**
*Rationale:* Andexanet alfa reverses Factor Xa inhibitors (apixaban,
rivaroxaban, edoxaban). Idarucizumab reverses dabigatran (direct
thrombin inhibitor).
**3. A 72-year-old patient with renal impairment (CrCl 25 mL/min)
requires anticoagulation for DVT. Which direct oral anticoagulant
(DOAC) requires dose adjustment and is safest?**
A) Rivaroxaban 20 mg daily
B) Apixaban 2.5 mg BID
C) Dabigatran 150 mg BID
D) Edoxaban 60 mg daily
**Answer: B**
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*Rationale:* Apixaban has lowest renal excretion (~25%). At CrCl <30
mL/min, apixaban dose is reduced to 2.5 mg BID. Dabigatran (80%
renal) contraindicated if CrCl <30.
**4. A patient on warfarin has an INR of 4.8 without bleeding. What is
the appropriate management?**
A) Hold warfarin and give oral vitamin K 2.5 mg
B) Administer fresh frozen plasma immediately
C) Give IV vitamin K 10 mg
D) Continue warfarin at same dose
**Answer: A**
*Rationale:* INR 4.5–10 without bleeding: hold warfarin, give low-dose
oral vitamin K (1–2.5 mg). IV vitamin K reserved for bleeding or very
high INR (>10).
**5. Which antiplatelet agent irreversibly inhibits the P2Y12
receptor?**
A) Aspirin
B) Clopidogrel
C) Ticagrelor
D) Cilostazol
**Answer: B**
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*Rationale:* Clopidogrel and prasugrel are irreversible P2Y12
inhibitors. Ticagrelor is reversible. Aspirin inhibits COX-1.
**6. A patient with heparin-induced thrombocytopenia (HIT) requires
anticoagulation. Which agent is contraindicated?**
A) Argatroban
B) Bivalirudin
C) Lepirudin
D) Enoxaparin
**Answer: D**
*Rationale:* All heparins (unfractionated and LMWH) are
contraindicated in HIT. Direct thrombin inhibitors (argatroban,
bivalirudin) are used.
**7. A patient on warfarin is started on rifampin for tuberculosis. What
change in INR is expected and why?**
A) Increased INR – rifampin inhibits warfarin metabolism
B) Decreased INR – rifampin induces CYP2C9
C) No change
D) Unpredictable
**Answer: B**