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NR 566 Advanced Pharmacology
Midterm | 2026 Updated Exam Bank –
Antibiotics, HIV, Antifungals & More
Questions And Well Graded Solutions
With Rationales Updated 2026-2027
Multiple Choice Questions Covering All Topics
ANTIMICROBIAL THERAPY & ANTIBIOTICS (Questions 1-
35)
Question 1: A 28-year-old female presents with dysuria, frequency, and suprapubic
pain. Urinalysis shows positive nitrites and leukocyte esterase. Which pathogen is
responsible for approximately 80% of uncomplicated UTIs?
A. Klebsiella pneumoniae
B. Staphylococcus saprophyticus
C. Escherichia coli
D. Proteus mirabilis
Answer: C. Escherichia coli
Rationale: E. coli is responsible for approximately 80% of uncomplicated
community-acquired UTIs. Other pathogens include Klebsiella (5-10%), Proteus
(5%), Enterococcus, and Staphylococcus saprophyticus (5-10% in young women).
E. coli's virulence factors include P fimbriae that facilitate adherence to
uroepithelial cells.
Question 2: Which of the following is the recommended first-line antibiotic for an
uncomplicated UTI in a non-pregnant female?
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A. Ciprofloxacin 250 mg BID for 3 days
B. Nitrofurantoin 100 mg BID for 5 days
C. Amoxicillin 500 mg TID for 7 days
D. Cephalexin 500 mg BID for 7 days
Answer: B. Nitrofurantoin 100 mg BID for 5 days
Rationale: Nitrofurantoin and trimethoprim-sulfamethoxazole (TMP-SMX) are
first-line agents for uncomplicated UTI, with nitrofurantoin preferred due to
increasing E. coli resistance to TMP-SMX (approaching 20-30%). The
recommended duration is 5 days for nitrofurantoin and 3 days for TMP-SMX.
Fluoroquinolones are reserved for complicated UTIs or when resistance is
documented.
Question 3: A 32-year-old patient with a history of penicillin-induced anaphylaxis is
diagnosed with a UTI. Which antibiotic should be AVOIDED due to cross-reactivity
risk?
A. Trimethoprim-sulfamethoxazole
B. Nitrofurantoin
C. Cephalexin
D. Fosfomycin
Answer: C. Cephalexin
Rationale: Cephalosporins, particularly first-generation agents like cephalexin,
have a 1-10% cross-reactivity risk in patients with documented IgE-mediated
penicillin allergy. Cephalexin shares the beta-lactam ring structure with
penicillins, increasing cross-reactivity. Nitrofurantoin, TMP-SMX, and
fosfomycin are safe alternatives with no cross-reactivity risk.
Question 4: A 65-year-old male is prescribed levofloxacin for pneumonia. What
black box warning should the provider discuss with the patient?
A. Hepatotoxicity
B. Tendon rupture
C. Nephrotoxicity
D. Cardiotoxicity
Answer: B. Tendon rupture
Rationale: Fluoroquinolones (levofloxacin, ciprofloxacin, moxifloxacin) carry an
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FDA black box warning for increased risk of tendinitis and tendon rupture,
particularly affecting the Achilles tendon. Risk factors include age >60,
corticosteroid use, organ transplantation, and renal impairment. Patients
should be advised to report tendon pain, swelling, or inflammation
immediately.
Question 5: A patient on azithromycin develops a prolonged QT interval on ECG.
Which medication class, when combined with macrolides, increases this risk?
A. Beta-blockers
B. Class III antiarrhythmics (amiodarone)
C. ACE inhibitors
D. Calcium channel blockers
Answer: B. Class III antiarrhythmics (amiodarone)
Rationale: Macrolides, particularly erythromycin and clarithromycin, can
prolong the QT interval. This risk is amplified when combined with other QT-
prolonging drugs including Class IA and III antiarrhythmics (amiodarone,
sotalol), antipsychotics, and certain antidepressants. Azithromycin has a lower
but still present risk. ECG monitoring is recommended in patients with risk
factors.
Question 6: Which penicillinase-resistant penicillin is the drug of choice for
methicillin-susceptible Staphylococcus aureus (MSSA) infections?
A. Ampicillin
B. Amoxicillin
C. Nafcillin
D. Penicillin G
Answer: C. Nafcillin
Rationale: Nafcillin, oxacillin, and dicloxacillin are penicillinase-resistant
penicillins effective against MSSA. They resist degradation by staphylococcal
beta-lactamases. Ampicillin and amoxicillin are broader spectrum but are
susceptible to penicillinase. Vancomycin is reserved for MRSA. Nafcillin is
administered IV for serious MSSA infections; dicloxacillin is the oral equivalent.
,2|Page
NR 566 Advanced Pharmacology
Midterm | 2026 Updated Exam Bank –
Antibiotics, HIV, Antifungals & More
Questions And Well Graded Solutions
With Rationales Updated 2026-2027
Multiple Choice Questions Covering All Topics
ANTIMICROBIAL THERAPY & ANTIBIOTICS (Questions 1-
35)
Question 1: A 28-year-old female presents with dysuria, frequency, and suprapubic
pain. Urinalysis shows positive nitrites and leukocyte esterase. Which pathogen is
responsible for approximately 80% of uncomplicated UTIs?
A. Klebsiella pneumoniae
B. Staphylococcus saprophyticus
C. Escherichia coli
D. Proteus mirabilis
Answer: C. Escherichia coli
Rationale: E. coli is responsible for approximately 80% of uncomplicated
community-acquired UTIs. Other pathogens include Klebsiella (5-10%), Proteus
(5%), Enterococcus, and Staphylococcus saprophyticus (5-10% in young women).
E. coli's virulence factors include P fimbriae that facilitate adherence to
uroepithelial cells.
Question 2: Which of the following is the recommended first-line antibiotic for an
uncomplicated UTI in a non-pregnant female?
,3|Page
A. Ciprofloxacin 250 mg BID for 3 days
B. Nitrofurantoin 100 mg BID for 5 days
C. Amoxicillin 500 mg TID for 7 days
D. Cephalexin 500 mg BID for 7 days
Answer: B. Nitrofurantoin 100 mg BID for 5 days
Rationale: Nitrofurantoin and trimethoprim-sulfamethoxazole (TMP-SMX) are
first-line agents for uncomplicated UTI, with nitrofurantoin preferred due to
increasing E. coli resistance to TMP-SMX (approaching 20-30%). The
recommended duration is 5 days for nitrofurantoin and 3 days for TMP-SMX.
Fluoroquinolones are reserved for complicated UTIs or when resistance is
documented.
Question 3: A 32-year-old patient with a history of penicillin-induced anaphylaxis is
diagnosed with a UTI. Which antibiotic should be AVOIDED due to cross-reactivity
risk?
A. Trimethoprim-sulfamethoxazole
B. Nitrofurantoin
C. Cephalexin
D. Fosfomycin
Answer: C. Cephalexin
Rationale: Cephalosporins, particularly first-generation agents like cephalexin,
have a 1-10% cross-reactivity risk in patients with documented IgE-mediated
penicillin allergy. Cephalexin shares the beta-lactam ring structure with
penicillins, increasing cross-reactivity. Nitrofurantoin, TMP-SMX, and
fosfomycin are safe alternatives with no cross-reactivity risk.
Question 4: A 65-year-old male is prescribed levofloxacin for pneumonia. What
black box warning should the provider discuss with the patient?
A. Hepatotoxicity
B. Tendon rupture
C. Nephrotoxicity
D. Cardiotoxicity
Answer: B. Tendon rupture
Rationale: Fluoroquinolones (levofloxacin, ciprofloxacin, moxifloxacin) carry an
, 4|Page
FDA black box warning for increased risk of tendinitis and tendon rupture,
particularly affecting the Achilles tendon. Risk factors include age >60,
corticosteroid use, organ transplantation, and renal impairment. Patients
should be advised to report tendon pain, swelling, or inflammation
immediately.
Question 5: A patient on azithromycin develops a prolonged QT interval on ECG.
Which medication class, when combined with macrolides, increases this risk?
A. Beta-blockers
B. Class III antiarrhythmics (amiodarone)
C. ACE inhibitors
D. Calcium channel blockers
Answer: B. Class III antiarrhythmics (amiodarone)
Rationale: Macrolides, particularly erythromycin and clarithromycin, can
prolong the QT interval. This risk is amplified when combined with other QT-
prolonging drugs including Class IA and III antiarrhythmics (amiodarone,
sotalol), antipsychotics, and certain antidepressants. Azithromycin has a lower
but still present risk. ECG monitoring is recommended in patients with risk
factors.
Question 6: Which penicillinase-resistant penicillin is the drug of choice for
methicillin-susceptible Staphylococcus aureus (MSSA) infections?
A. Ampicillin
B. Amoxicillin
C. Nafcillin
D. Penicillin G
Answer: C. Nafcillin
Rationale: Nafcillin, oxacillin, and dicloxacillin are penicillinase-resistant
penicillins effective against MSSA. They resist degradation by staphylococcal
beta-lactamases. Ampicillin and amoxicillin are broader spectrum but are
susceptible to penicillinase. Vancomycin is reserved for MRSA. Nafcillin is
administered IV for serious MSSA infections; dicloxacillin is the oral equivalent.
