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NURS 5334 Pharmacology Quiz 1 2025
– Actual Exam Questions with 100%
Verified Correct Answers | A+ Graded
Study Guide | Expert-Tested
Pharmacology Principles, Prescribing Basics,
Pharmacogenomics, Drugs Across the Lifespan, and
Antibiotics
1. What is the primary focus of pharmacodynamics in pharmacology?
A) Drug absorption rates
B) Effect of drugs on the body
C) Drug metabolism pathways
D) Drug distribution in tissues
B) Effect of drugs on the body
Rationale: Pharmacodynamics studies how drugs interact with receptors, enzymes, or
other targets to produce therapeutic or adverse effects. It focuses on mechanisms of
action, dose-response relationships, and receptor binding, distinguishing it from
pharmacokinetics, which covers absorption, distribution, metabolism, and excretion.
2. Which phase of drug development involves testing on healthy volunteers to assess
safety?
A) Phase I
B) Phase II
C) Phase III
D) Phase IV
A) Phase I
Rationale: Phase I trials evaluate a drug’s safety, tolerability, and pharmacokinetics in a
small group of healthy volunteers, typically focusing on dose-ranging and side effects.
Phases II and III assess efficacy, while Phase IV involves post-marketing surveillance.
3. What does a drug’s half-life indicate?
A) Time to reach peak plasma concentration
B) Time for 50% of the drug to be eliminated
C) Duration of therapeutic effect
D) Time for complete drug absorption
B) Time for 50% of the drug to be eliminated
Rationale: Half-life is the time required for the plasma concentration of a drug to
decrease by 50%, reflecting its elimination rate. It influences dosing frequency and
steady-state concentration but is distinct from absorption or therapeutic duration.
, 2
4. Which route of administration bypasses first-pass metabolism?
A) Oral
B) Intravenous
C) Rectal
D) Sublingual
B) Intravenous
Rationale: Intravenous administration delivers drugs directly into systemic circulation,
bypassing the liver’s first-pass metabolism, which reduces bioavailability for drugs given
orally, rectally, or sublingually.
5. What is the role of cytochrome P450 enzymes in drug metabolism?
A) Facilitate drug absorption
B) Catalyze drug biotransformation
C) Enhance drug excretion
D) Bind drugs to plasma proteins
B) Catalyze drug biotransformation
Rationale: Cytochrome P450 enzymes, primarily in the liver, metabolize drugs by
catalyzing oxidation, reduction, or hydrolysis, converting them into active or inactive
metabolites for excretion.
6. A patient with renal impairment requires a dose adjustment for which drug?
A) Amoxicillin
B) Lisinopril
C) Atorvastatin
D) Albuterol
B) Lisinopril
Rationale: Lisinopril, an ACE inhibitor, is primarily excreted renally, requiring dose
adjustments in renal impairment to prevent accumulation and toxicity. Amoxicillin,
atorvastatin, and albuterol have less renal dependence.
7. Which factor most affects drug absorption in the elderly?
A) Increased gastric pH
B) Enhanced liver metabolism
C) Increased cardiac output
D) Decreased renal clearance
A) Increased gastric pH
Rationale: Aging increases gastric pH due to reduced acid production, altering the
absorption of pH-dependent drugs. Liver metabolism and renal clearance typically
decrease, and cardiac output may not directly impact absorption.
8. What is the primary purpose of a DEA number on a prescription?
A) Identify the prescribing provider for controlled substances
B) Track patient medication history
C) Verify drug dosage accuracy
D) Ensure insurance coverage
A) Identify the prescribing provider for controlled substances
Rationale: A DEA number is required on prescriptions for controlled substances to
identify and regulate prescribers, ensuring accountability in their distribution.
9. Which pharmacogenomic factor affects warfarin dosing?
A) CYP2D6 polymorphism
, 3
B) CYP2C9 polymorphism
C) CYP3A4 polymorphism
D) CYP1A2 polymorphism
B) CYP2C9 polymorphism
Rationale: CYP2C9 polymorphisms influence warfarin metabolism, affecting its
anticoagulant effect and requiring dose adjustments to prevent bleeding or inefficacy.
VKORC1 also plays a role, but CYP2C9 is more directly implicated.
10. What is the mechanism of action of penicillin antibiotics?
A) Inhibit protein synthesis
B) Disrupt cell wall synthesis
C) Inhibit DNA replication
D) Block folate synthesis
B) Disrupt cell wall synthesis
Rationale: Penicillins inhibit bacterial cell wall synthesis by binding to penicillin-binding
proteins, preventing peptidoglycan cross-linking, leading to cell lysis.
11. Which drug requires monitoring for blood dyscrasias in pediatric patients?
A) Ethosuximide
B) Amoxicillin
C) Albuterol
D) Ibuprofen
A) Ethosuximide
Rationale: Ethosuximide, used for seizures, can cause blood dyscrasias (e.g.,
leukopenia), requiring monitoring, especially in children. The others have lower risks for
this adverse effect.
12. What is the significance of a drug’s therapeutic index?
A) Ratio of effective dose to toxic dose
B) Time to reach steady state
C) Rate of drug absorption
D) Extent of protein binding
A) Ratio of effective dose to toxic dose
Rationale: The therapeutic index (TI = TD50/ED50) measures a drug’s safety margin,
with a higher TI indicating a safer drug due to a larger gap between effective and toxic
doses.
13. Which antibiotic is most likely to cause an allergic reaction?
A) Azithromycin
B) Amoxicillin
C) Doxycycline
D) Ciprofloxacin
B) Amoxicillin
Rationale: Amoxicillin, a penicillin, has a higher incidence of allergic reactions (e.g.,
rash, anaphylaxis) due to beta-lactam ring sensitization compared to macrolides,
tetracyclines, or fluoroquinolones.
14. What does “first-pass metabolism” refer to?
A) Drug metabolism in the kidneys
B) Drug breakdown in the liver before systemic circulation
C) Drug absorption in the stomach
NURS 5334 Pharmacology Quiz 1 2025
– Actual Exam Questions with 100%
Verified Correct Answers | A+ Graded
Study Guide | Expert-Tested
Pharmacology Principles, Prescribing Basics,
Pharmacogenomics, Drugs Across the Lifespan, and
Antibiotics
1. What is the primary focus of pharmacodynamics in pharmacology?
A) Drug absorption rates
B) Effect of drugs on the body
C) Drug metabolism pathways
D) Drug distribution in tissues
B) Effect of drugs on the body
Rationale: Pharmacodynamics studies how drugs interact with receptors, enzymes, or
other targets to produce therapeutic or adverse effects. It focuses on mechanisms of
action, dose-response relationships, and receptor binding, distinguishing it from
pharmacokinetics, which covers absorption, distribution, metabolism, and excretion.
2. Which phase of drug development involves testing on healthy volunteers to assess
safety?
A) Phase I
B) Phase II
C) Phase III
D) Phase IV
A) Phase I
Rationale: Phase I trials evaluate a drug’s safety, tolerability, and pharmacokinetics in a
small group of healthy volunteers, typically focusing on dose-ranging and side effects.
Phases II and III assess efficacy, while Phase IV involves post-marketing surveillance.
3. What does a drug’s half-life indicate?
A) Time to reach peak plasma concentration
B) Time for 50% of the drug to be eliminated
C) Duration of therapeutic effect
D) Time for complete drug absorption
B) Time for 50% of the drug to be eliminated
Rationale: Half-life is the time required for the plasma concentration of a drug to
decrease by 50%, reflecting its elimination rate. It influences dosing frequency and
steady-state concentration but is distinct from absorption or therapeutic duration.
, 2
4. Which route of administration bypasses first-pass metabolism?
A) Oral
B) Intravenous
C) Rectal
D) Sublingual
B) Intravenous
Rationale: Intravenous administration delivers drugs directly into systemic circulation,
bypassing the liver’s first-pass metabolism, which reduces bioavailability for drugs given
orally, rectally, or sublingually.
5. What is the role of cytochrome P450 enzymes in drug metabolism?
A) Facilitate drug absorption
B) Catalyze drug biotransformation
C) Enhance drug excretion
D) Bind drugs to plasma proteins
B) Catalyze drug biotransformation
Rationale: Cytochrome P450 enzymes, primarily in the liver, metabolize drugs by
catalyzing oxidation, reduction, or hydrolysis, converting them into active or inactive
metabolites for excretion.
6. A patient with renal impairment requires a dose adjustment for which drug?
A) Amoxicillin
B) Lisinopril
C) Atorvastatin
D) Albuterol
B) Lisinopril
Rationale: Lisinopril, an ACE inhibitor, is primarily excreted renally, requiring dose
adjustments in renal impairment to prevent accumulation and toxicity. Amoxicillin,
atorvastatin, and albuterol have less renal dependence.
7. Which factor most affects drug absorption in the elderly?
A) Increased gastric pH
B) Enhanced liver metabolism
C) Increased cardiac output
D) Decreased renal clearance
A) Increased gastric pH
Rationale: Aging increases gastric pH due to reduced acid production, altering the
absorption of pH-dependent drugs. Liver metabolism and renal clearance typically
decrease, and cardiac output may not directly impact absorption.
8. What is the primary purpose of a DEA number on a prescription?
A) Identify the prescribing provider for controlled substances
B) Track patient medication history
C) Verify drug dosage accuracy
D) Ensure insurance coverage
A) Identify the prescribing provider for controlled substances
Rationale: A DEA number is required on prescriptions for controlled substances to
identify and regulate prescribers, ensuring accountability in their distribution.
9. Which pharmacogenomic factor affects warfarin dosing?
A) CYP2D6 polymorphism
, 3
B) CYP2C9 polymorphism
C) CYP3A4 polymorphism
D) CYP1A2 polymorphism
B) CYP2C9 polymorphism
Rationale: CYP2C9 polymorphisms influence warfarin metabolism, affecting its
anticoagulant effect and requiring dose adjustments to prevent bleeding or inefficacy.
VKORC1 also plays a role, but CYP2C9 is more directly implicated.
10. What is the mechanism of action of penicillin antibiotics?
A) Inhibit protein synthesis
B) Disrupt cell wall synthesis
C) Inhibit DNA replication
D) Block folate synthesis
B) Disrupt cell wall synthesis
Rationale: Penicillins inhibit bacterial cell wall synthesis by binding to penicillin-binding
proteins, preventing peptidoglycan cross-linking, leading to cell lysis.
11. Which drug requires monitoring for blood dyscrasias in pediatric patients?
A) Ethosuximide
B) Amoxicillin
C) Albuterol
D) Ibuprofen
A) Ethosuximide
Rationale: Ethosuximide, used for seizures, can cause blood dyscrasias (e.g.,
leukopenia), requiring monitoring, especially in children. The others have lower risks for
this adverse effect.
12. What is the significance of a drug’s therapeutic index?
A) Ratio of effective dose to toxic dose
B) Time to reach steady state
C) Rate of drug absorption
D) Extent of protein binding
A) Ratio of effective dose to toxic dose
Rationale: The therapeutic index (TI = TD50/ED50) measures a drug’s safety margin,
with a higher TI indicating a safer drug due to a larger gap between effective and toxic
doses.
13. Which antibiotic is most likely to cause an allergic reaction?
A) Azithromycin
B) Amoxicillin
C) Doxycycline
D) Ciprofloxacin
B) Amoxicillin
Rationale: Amoxicillin, a penicillin, has a higher incidence of allergic reactions (e.g.,
rash, anaphylaxis) due to beta-lactam ring sensitization compared to macrolides,
tetracyclines, or fluoroquinolones.
14. What does “first-pass metabolism” refer to?
A) Drug metabolism in the kidneys
B) Drug breakdown in the liver before systemic circulation
C) Drug absorption in the stomach
