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NR 566 Midterm Exam (2026) | Chamberlain
Advanced Pharmacology Practice Questions
And Well Graded Solutions With Rationales
Updated 2026-2027
Comprehensive Review Covering All Topics
ANTIMICROBIAL THERAPY & ANTIBIOTICS (Questions 1-
60)
Question 1: A 24-year-old female presents with dysuria, frequency, and urgency.
Urinalysis reveals positive nitrites and leukocyte esterase. What is the most common
pathogen responsible for her infection?
Answer: A. Escherichia coli
Rationale: E. coli is responsible for approximately 80% of uncomplicated
community-acquired urinary tract infections. Other pathogens include
Klebsiella, Proteus, Enterococcus, and Staphylococcus saprophyticus, but E. coli
remains the predominant organism.
Question 2: Which first-line antibiotic regimen is recommended for an
uncomplicated UTI in a non-pregnant female?
Answer: B. Nitrofurantoin 100 mg BID for 5 days
Rationale: Nitrofurantoin and trimethoprim-sulfamethoxazole are first-line
agents for uncomplicated UTIs. Nitrofurantoin is preferred due to increasing E.
coli resistance to TMP-SMX. The typical duration is 5 days for nitrofurantoin
and 3 days for TMP-SMX.
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Question 3: A patient with a UTI reports a penicillin allergy. Which antibiotic should
be avoided due to cross-reactivity?
Answer: C. Cephalexin
Rationale: Cephalosporins have a 1-10% cross-reactivity risk in patients with
documented penicillin allergy. First-generation cephalosporins like cephalexin
carry a higher risk compared to later generations. Alternative options include
nitrofurantoin or fluoroquinolones.
Question 4: Which antibiotic class is associated with a black box warning for tendon
rupture?
Answer: D. Fluoroquinolones
Rationale: Fluoroquinolones (ciprofloxacin, levofloxacin, moxifloxacin) carry an
FDA black box warning for increased risk of tendinitis and tendon rupture,
particularly affecting the Achilles tendon. Risk is higher in patients over 60,
those on corticosteroids, and organ transplant recipients.
Question 5: A 45-year-old male is prescribed ciprofloxacin for a UTI. What important
medication interaction should be discussed?
Answer: B. Avoid antacids containing calcium, magnesium, or aluminum
Rationale: Fluoroquinolones chelate with divalent and trivalent cations
(calcium, magnesium, aluminum, iron, zinc), significantly reducing oral
absorption and bioavailability. Patients should separate dosing by at least 2-4
hours from these products.
Question 6: Which macrolide antibiotic is preferred for atypical pneumonia due to
its shorter half-life and better tolerability?
Answer: C. Azithromycin
Rationale: Azithromycin is preferred over erythromycin and clarithromycin for
atypical pneumonia due to its once-daily dosing, shorter treatment course (5
days), better GI tolerability, and fewer drug interactions. It is effective against
Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Legionella.
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Question 7: A patient on azithromycin develops QT prolongation on ECG. Which
class of medications increases this risk when combined with macrolides?
Answer: A. Class III antiarrhythmics (amiodarone, sotalol)
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, antipsychotics, and
certain antidepressants. Azithromycin has a lower but still present risk.
Question 8: Which penicillinase-resistant penicillin is used for methicillin-susceptible
Staphylococcus aureus (MSSA) infections?
Answer: D. Nafcillin
Rationale: Nafcillin, oxacillin, and dicloxacillin are penicillinase-resistant
penicillins effective against MSSA. They resist degradation by staphylococcal
beta-lactamases. Vancomycin is reserved for MRSA, while ampicillin and
amoxicillin are broader spectrum but not penicillinase-resistant.
Question 9: A patient with a severe penicillin allergy (anaphylaxis) requires
antibiotics. Which cephalosporin has the LOWEST cross-reactivity risk?
Answer: C. Cefepime
Rationale: Cross-reactivity between penicillins and cephalosporins is highest
with first-generation cephalosporins (cefalexin, cefazolin) and lowest with
third- and fourth-generation agents (ceftriaxone, cefepime). However, any
cephalosporin should be used with extreme caution in patients with severe IgE-
mediated penicillin allergy.
Question 10: What is the mechanism of action of sulfonamides?
Answer: B. Inhibition of bacterial folate synthesis via PABA competition
Rationale: Sulfonamides are structural analogs of para-aminobenzoic acid
(PABA). They competitively inhibit dihydropteroate synthase, blocking bacterial
,2|Page
NR 566 Midterm Exam (2026) | Chamberlain
Advanced Pharmacology Practice Questions
And Well Graded Solutions With Rationales
Updated 2026-2027
Comprehensive Review Covering All Topics
ANTIMICROBIAL THERAPY & ANTIBIOTICS (Questions 1-
60)
Question 1: A 24-year-old female presents with dysuria, frequency, and urgency.
Urinalysis reveals positive nitrites and leukocyte esterase. What is the most common
pathogen responsible for her infection?
Answer: A. Escherichia coli
Rationale: E. coli is responsible for approximately 80% of uncomplicated
community-acquired urinary tract infections. Other pathogens include
Klebsiella, Proteus, Enterococcus, and Staphylococcus saprophyticus, but E. coli
remains the predominant organism.
Question 2: Which first-line antibiotic regimen is recommended for an
uncomplicated UTI in a non-pregnant female?
Answer: B. Nitrofurantoin 100 mg BID for 5 days
Rationale: Nitrofurantoin and trimethoprim-sulfamethoxazole are first-line
agents for uncomplicated UTIs. Nitrofurantoin is preferred due to increasing E.
coli resistance to TMP-SMX. The typical duration is 5 days for nitrofurantoin
and 3 days for TMP-SMX.
,3|Page
Question 3: A patient with a UTI reports a penicillin allergy. Which antibiotic should
be avoided due to cross-reactivity?
Answer: C. Cephalexin
Rationale: Cephalosporins have a 1-10% cross-reactivity risk in patients with
documented penicillin allergy. First-generation cephalosporins like cephalexin
carry a higher risk compared to later generations. Alternative options include
nitrofurantoin or fluoroquinolones.
Question 4: Which antibiotic class is associated with a black box warning for tendon
rupture?
Answer: D. Fluoroquinolones
Rationale: Fluoroquinolones (ciprofloxacin, levofloxacin, moxifloxacin) carry an
FDA black box warning for increased risk of tendinitis and tendon rupture,
particularly affecting the Achilles tendon. Risk is higher in patients over 60,
those on corticosteroids, and organ transplant recipients.
Question 5: A 45-year-old male is prescribed ciprofloxacin for a UTI. What important
medication interaction should be discussed?
Answer: B. Avoid antacids containing calcium, magnesium, or aluminum
Rationale: Fluoroquinolones chelate with divalent and trivalent cations
(calcium, magnesium, aluminum, iron, zinc), significantly reducing oral
absorption and bioavailability. Patients should separate dosing by at least 2-4
hours from these products.
Question 6: Which macrolide antibiotic is preferred for atypical pneumonia due to
its shorter half-life and better tolerability?
Answer: C. Azithromycin
Rationale: Azithromycin is preferred over erythromycin and clarithromycin for
atypical pneumonia due to its once-daily dosing, shorter treatment course (5
days), better GI tolerability, and fewer drug interactions. It is effective against
Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Legionella.
, 4|Page
Question 7: A patient on azithromycin develops QT prolongation on ECG. Which
class of medications increases this risk when combined with macrolides?
Answer: A. Class III antiarrhythmics (amiodarone, sotalol)
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, antipsychotics, and
certain antidepressants. Azithromycin has a lower but still present risk.
Question 8: Which penicillinase-resistant penicillin is used for methicillin-susceptible
Staphylococcus aureus (MSSA) infections?
Answer: D. Nafcillin
Rationale: Nafcillin, oxacillin, and dicloxacillin are penicillinase-resistant
penicillins effective against MSSA. They resist degradation by staphylococcal
beta-lactamases. Vancomycin is reserved for MRSA, while ampicillin and
amoxicillin are broader spectrum but not penicillinase-resistant.
Question 9: A patient with a severe penicillin allergy (anaphylaxis) requires
antibiotics. Which cephalosporin has the LOWEST cross-reactivity risk?
Answer: C. Cefepime
Rationale: Cross-reactivity between penicillins and cephalosporins is highest
with first-generation cephalosporins (cefalexin, cefazolin) and lowest with
third- and fourth-generation agents (ceftriaxone, cefepime). However, any
cephalosporin should be used with extreme caution in patients with severe IgE-
mediated penicillin allergy.
Question 10: What is the mechanism of action of sulfonamides?
Answer: B. Inhibition of bacterial folate synthesis via PABA competition
Rationale: Sulfonamides are structural analogs of para-aminobenzoic acid
(PABA). They competitively inhibit dihydropteroate synthase, blocking bacterial
