NUR 615 Module 2 Advanced Antibiotic Pharmacology: Second Comprehensive 150-Question
Practice Examination with 2026 Evidence-Based Rationales, Clinical Pearls, and Board-Style Multiple
Choice Answers for Graduate Nursing Success.
Questions 1–150 (Second Set — Complete)
1. A 55-year-old with E. coli pyelonephritis is allergic to penicillin (anaphylaxis). Which outpatient
oral antibiotic is most appropriate after initial IV therapy?
A) Cephalexin
B) Ciprofloxacin
C) Amoxicillin-clavulanate
D) Doxycycline
Correct Answer: B) Ciprofloxacin
Explanation: For pyelonephritis in a patient with severe penicillin allergy, a fluoroquinolone
(ciprofloxacin or levofloxacin) is appropriate if local resistance <10%. Doxycycline does not reliably
cover E. coli.
2. A 40-year-old with Clostridioides difficile infection has a white blood cell count of 8,000 and
creatinine 0.9 mg/dL. What is first-line therapy?
A) Oral metronidazole
B) Oral vancomycin 125 mg QID
C) Oral vancomycin 500 mg QID
D) Fidaxomicin
Correct Answer: B) Oral vancomycin 125 mg QID
Explanation: For non-severe C. diff, oral vancomycin 125 mg QID is first-line (2026 guidelines).
Fidaxomicin is also effective but costlier. Metronidazole is no longer first-line.
3. A 30-year-old with Neisseria gonorrhoeae is treated with ceftriaxone 500 mg IM. What is the
most common ceftriaxone adverse effect?
A) Diarrhea
B) Injection site pain
C) Nephrotoxicity
D) Seizures
,Correct Answer: B) Injection site pain
Explanation: Intramuscular ceftriaxone commonly causes injection site pain (10-15%). Diarrhea is less
common with single dose.
4. A 68-year-old with Pseudomonas aeruginosa pneumonia is on tobramycin. What is the goal peak
level for once-daily dosing?
A) 5-10 mcg/mL
B) 10-15 mcg/mL
C) 16-24 mcg/mL
D) 25-35 mcg/mL
Correct Answer: C) 16-24 mcg/mL
Explanation: For once-daily aminoglycoside dosing, peak levels of 16-24 mcg/mL are therapeutic.
Trough should be <1 mcg/mL to avoid toxicity.
5. A 45-year-old with Staphylococcus aureus bacteremia is on cefazolin. The MIC is 2 mcg/mL. What
does this indicate?
A) Susceptible
B) Resistant
C) Intermediate
D) Needs susceptibility testing
Correct Answer: A) Susceptible
Explanation: For S. aureus, cefazolin susceptibility breakpoint is ≤2 mcg/mL (CLSI). MIC 2 is
susceptible.
6. A 25-year-old with Chlamydia trachomatis is pregnant and allergic to azithromycin (hives). What
is first-line alternative?
A) Doxycycline
B) Erythromycin base
C) Amoxicillin
D) Levofloxacin
Correct Answer: C) Amoxicillin
Explanation: In pregnancy with azithromycin allergy, amoxicillin 500 mg TID x7 days is recommended
(CDC). Erythromycin causes GI intolerance.
,7. A 70-year-old with Klebsiella pneumoniae bacteremia is on meropenem. After 48 hours, she
develops red-orange urine. What is the likely cause?
A) Meropenem side effect
B) Rifampin if added
C) Hematuria
D) Bilirubin
Correct Answer: B) Rifampin if added
Explanation: Red-orange urine is classic for rifampin (not meropenem). Check if rifampin was added
for synergy.
8. A 50-year-old with Mycoplasma pneumoniae pneumonia is treated with doxycycline. What is the
mechanism of doxycycline?
A) 50S ribosome inhibition
B) 30S ribosome inhibition
C) Cell wall inhibition
D) DNA gyrase inhibition
Correct Answer: B) 30S ribosome inhibition
Explanation: Tetracyclines (doxycycline) bind the 30S ribosomal subunit, blocking tRNA entry. They are
bacteriostatic.
9. A 35-year-old with Salmonella enteritidis gastroenteritis has fever and bloody diarrhea. He is
immunocompromised. What antibiotic is indicated?
A) No antibiotic (self-limited)
B) Azithromycin
C) Amoxicillin
D) Metronidazole
Correct Answer: B) Azithromycin
Explanation: Immunocompromised patients with Salmonella gastroenteritis require antibiotics.
Azithromycin or ciprofloxacin (if susceptible) is used.
, 10. A 60-year-old with C. difficile infection is on oral vancomycin. Day 4, creatinine rises from 1.0 to
2.2 mg/dL. What is the most appropriate action?
A) Stop vancomycin
B) Continue vancomycin; add IV metronidazole
C) Switch to fidaxomicin
D) Add bezlotoxumab
Correct Answer: B) Continue vancomycin; add IV metronidazole
Explanation: Rising creatinine with C. diff indicates severe, complicated infection (creatinine >1.5
mg/dL). Add IV metronidazole to oral vancomycin.
11. A 45-year-old with Listeria monocytogenes meningitis is on ampicillin plus gentamicin. The
patient develops tinnitus. Which drug is most likely responsible?
A) Ampicillin
B) Gentamicin
C) Both
D) Meningitis itself
Correct Answer: B) Gentamicin
Explanation: Aminoglycosides (gentamicin) cause ototoxicity (tinnitus, hearing loss). Ampicillin does
not.
12. A 28-year-old with Ureaplasma urealyticum urethritis is treated with doxycycline. What is the
duration?
A) Single dose
B) 7 days
C) 14 days
D) 21 days
Correct Answer: B) 7 days
Explanation: Doxycycline 100 mg BID x7 days is standard for Ureaplasma urethritis. Azithromycin is
alternative.
13. A 55-year-old with Enterococcus faecium VRE bacteremia is on linezolid. What is the most
serious adverse effect of linezolid with prolonged use (>14 days)?
Practice Examination with 2026 Evidence-Based Rationales, Clinical Pearls, and Board-Style Multiple
Choice Answers for Graduate Nursing Success.
Questions 1–150 (Second Set — Complete)
1. A 55-year-old with E. coli pyelonephritis is allergic to penicillin (anaphylaxis). Which outpatient
oral antibiotic is most appropriate after initial IV therapy?
A) Cephalexin
B) Ciprofloxacin
C) Amoxicillin-clavulanate
D) Doxycycline
Correct Answer: B) Ciprofloxacin
Explanation: For pyelonephritis in a patient with severe penicillin allergy, a fluoroquinolone
(ciprofloxacin or levofloxacin) is appropriate if local resistance <10%. Doxycycline does not reliably
cover E. coli.
2. A 40-year-old with Clostridioides difficile infection has a white blood cell count of 8,000 and
creatinine 0.9 mg/dL. What is first-line therapy?
A) Oral metronidazole
B) Oral vancomycin 125 mg QID
C) Oral vancomycin 500 mg QID
D) Fidaxomicin
Correct Answer: B) Oral vancomycin 125 mg QID
Explanation: For non-severe C. diff, oral vancomycin 125 mg QID is first-line (2026 guidelines).
Fidaxomicin is also effective but costlier. Metronidazole is no longer first-line.
3. A 30-year-old with Neisseria gonorrhoeae is treated with ceftriaxone 500 mg IM. What is the
most common ceftriaxone adverse effect?
A) Diarrhea
B) Injection site pain
C) Nephrotoxicity
D) Seizures
,Correct Answer: B) Injection site pain
Explanation: Intramuscular ceftriaxone commonly causes injection site pain (10-15%). Diarrhea is less
common with single dose.
4. A 68-year-old with Pseudomonas aeruginosa pneumonia is on tobramycin. What is the goal peak
level for once-daily dosing?
A) 5-10 mcg/mL
B) 10-15 mcg/mL
C) 16-24 mcg/mL
D) 25-35 mcg/mL
Correct Answer: C) 16-24 mcg/mL
Explanation: For once-daily aminoglycoside dosing, peak levels of 16-24 mcg/mL are therapeutic.
Trough should be <1 mcg/mL to avoid toxicity.
5. A 45-year-old with Staphylococcus aureus bacteremia is on cefazolin. The MIC is 2 mcg/mL. What
does this indicate?
A) Susceptible
B) Resistant
C) Intermediate
D) Needs susceptibility testing
Correct Answer: A) Susceptible
Explanation: For S. aureus, cefazolin susceptibility breakpoint is ≤2 mcg/mL (CLSI). MIC 2 is
susceptible.
6. A 25-year-old with Chlamydia trachomatis is pregnant and allergic to azithromycin (hives). What
is first-line alternative?
A) Doxycycline
B) Erythromycin base
C) Amoxicillin
D) Levofloxacin
Correct Answer: C) Amoxicillin
Explanation: In pregnancy with azithromycin allergy, amoxicillin 500 mg TID x7 days is recommended
(CDC). Erythromycin causes GI intolerance.
,7. A 70-year-old with Klebsiella pneumoniae bacteremia is on meropenem. After 48 hours, she
develops red-orange urine. What is the likely cause?
A) Meropenem side effect
B) Rifampin if added
C) Hematuria
D) Bilirubin
Correct Answer: B) Rifampin if added
Explanation: Red-orange urine is classic for rifampin (not meropenem). Check if rifampin was added
for synergy.
8. A 50-year-old with Mycoplasma pneumoniae pneumonia is treated with doxycycline. What is the
mechanism of doxycycline?
A) 50S ribosome inhibition
B) 30S ribosome inhibition
C) Cell wall inhibition
D) DNA gyrase inhibition
Correct Answer: B) 30S ribosome inhibition
Explanation: Tetracyclines (doxycycline) bind the 30S ribosomal subunit, blocking tRNA entry. They are
bacteriostatic.
9. A 35-year-old with Salmonella enteritidis gastroenteritis has fever and bloody diarrhea. He is
immunocompromised. What antibiotic is indicated?
A) No antibiotic (self-limited)
B) Azithromycin
C) Amoxicillin
D) Metronidazole
Correct Answer: B) Azithromycin
Explanation: Immunocompromised patients with Salmonella gastroenteritis require antibiotics.
Azithromycin or ciprofloxacin (if susceptible) is used.
, 10. A 60-year-old with C. difficile infection is on oral vancomycin. Day 4, creatinine rises from 1.0 to
2.2 mg/dL. What is the most appropriate action?
A) Stop vancomycin
B) Continue vancomycin; add IV metronidazole
C) Switch to fidaxomicin
D) Add bezlotoxumab
Correct Answer: B) Continue vancomycin; add IV metronidazole
Explanation: Rising creatinine with C. diff indicates severe, complicated infection (creatinine >1.5
mg/dL). Add IV metronidazole to oral vancomycin.
11. A 45-year-old with Listeria monocytogenes meningitis is on ampicillin plus gentamicin. The
patient develops tinnitus. Which drug is most likely responsible?
A) Ampicillin
B) Gentamicin
C) Both
D) Meningitis itself
Correct Answer: B) Gentamicin
Explanation: Aminoglycosides (gentamicin) cause ototoxicity (tinnitus, hearing loss). Ampicillin does
not.
12. A 28-year-old with Ureaplasma urealyticum urethritis is treated with doxycycline. What is the
duration?
A) Single dose
B) 7 days
C) 14 days
D) 21 days
Correct Answer: B) 7 days
Explanation: Doxycycline 100 mg BID x7 days is standard for Ureaplasma urethritis. Azithromycin is
alternative.
13. A 55-year-old with Enterococcus faecium VRE bacteremia is on linezolid. What is the most
serious adverse effect of linezolid with prolonged use (>14 days)?
