NURS 5334 PHARM EXAM 300 ACTUAL
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALE LATEST UPDATE ALREADY GRADED
A+|LATEST UPDATE!!!
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Questions 1-30)
1. A patient with end-stage renal disease has a significantly reduced glomerular
filtration rate. Which pharmacokinetic process is most directly impaired?
A) Absorption
B) Distribution
C) Metabolism
D) Elimination
Correct Answer: D
*Rationale:* Elimination (specifically renal excretion) is directly dependent on
GFR. Reduced GFR leads to drug accumulation. Absorption is primarily GI;
distribution depends on blood flow and protein binding; metabolism is hepatic.
2. A drug has a half-life of 4 hours. Approximately how long will it take for the
drug to reach a steady-state concentration if administered at a constant rate?
,A) 8 hours
B) 12 hours
C) 20 hours
D) 40 hours
Correct Answer: C
*Rationale:* Steady-state is achieved after approximately 5 half-lives. 5 x 4 hours
= 20 hours.
3. Which route of administration results in 100% systemic bioavailability,
bypassing first-pass hepatic metabolism entirely?
A) Oral
B) Sublingual
C) Intravenous
D) Rectal
Correct Answer: C
*Rationale:* IV administration places the drug directly into the systemic
circulation. Sublingual and rectal bypass the liver initially but are not 100%
bioavailable due to local barriers. Oral is subject to first-pass.
4. A highly protein-bound drug (98% bound) is displaced from its binding site by a
second drug. What is the immediate clinical effect?
A) Decreased free drug concentration
B) Increased pharmacologic effect
,C) Decreased volume of distribution
D) Prolonged half-life
Correct Answer: B
*Rationale:* Displacement increases the free (unbound) fraction of the drug,
which is the pharmacologically active form. This leads to an intensified effect until
the free drug is redistributed or eliminated.
5. The term "first-pass effect" refers to the metabolism of a drug by which organ
before it reaches the systemic circulation?
A) Kidney
B) Liver
C) Lung
D) Heart
Correct Answer: B
*Rationale:* The first-pass effect primarily occurs in the liver via the hepatic
portal system after oral absorption. It reduces the amount of active drug reaching
systemic circulation.
6. Cytochrome P450 (CYP) enzymes are crucial for phase I drug metabolism.
Which inhibitor of CYP3A4 is commonly associated with life-threatening drug
interactions?
A) Rifampin
B) Phenytoin
C) Grapefruit juice
, D) St. John's Wort
Correct Answer: C
*Rationale:* Grapefruit juice inhibits CYP3A4, leading to increased serum
concentrations of drugs like statins and calcium channel blockers. Rifampin,
Phenytoin, and St. John's Wort are inducers.
7. A patient is prescribed a drug that is a weak acid. In an acidic environment (e.g.,
stomach), the drug will be:
A) Highly ionized and water-soluble
B) Mostly non-ionized and lipid-soluble
C) Completely bound to plasma proteins
D) Rapidly excreted in the urine
Correct Answer: B
*Rationale:* Weak acids are non-ionized in acidic environments (pH lower than
pKa). Non-ionized forms are lipid-soluble, allowing for easy absorption across cell
membranes.
8. The volume of distribution (Vd) for digoxin is approximately 500 L. This large Vd
indicates that digoxin is:
A) Confined to the vascular space
B) Highly bound to plasma proteins
C) Widely distributed into tissues
D) Rapidly cleared by the kidneys
Correct Answer: C
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALE LATEST UPDATE ALREADY GRADED
A+|LATEST UPDATE!!!
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Questions 1-30)
1. A patient with end-stage renal disease has a significantly reduced glomerular
filtration rate. Which pharmacokinetic process is most directly impaired?
A) Absorption
B) Distribution
C) Metabolism
D) Elimination
Correct Answer: D
*Rationale:* Elimination (specifically renal excretion) is directly dependent on
GFR. Reduced GFR leads to drug accumulation. Absorption is primarily GI;
distribution depends on blood flow and protein binding; metabolism is hepatic.
2. A drug has a half-life of 4 hours. Approximately how long will it take for the
drug to reach a steady-state concentration if administered at a constant rate?
,A) 8 hours
B) 12 hours
C) 20 hours
D) 40 hours
Correct Answer: C
*Rationale:* Steady-state is achieved after approximately 5 half-lives. 5 x 4 hours
= 20 hours.
3. Which route of administration results in 100% systemic bioavailability,
bypassing first-pass hepatic metabolism entirely?
A) Oral
B) Sublingual
C) Intravenous
D) Rectal
Correct Answer: C
*Rationale:* IV administration places the drug directly into the systemic
circulation. Sublingual and rectal bypass the liver initially but are not 100%
bioavailable due to local barriers. Oral is subject to first-pass.
4. A highly protein-bound drug (98% bound) is displaced from its binding site by a
second drug. What is the immediate clinical effect?
A) Decreased free drug concentration
B) Increased pharmacologic effect
,C) Decreased volume of distribution
D) Prolonged half-life
Correct Answer: B
*Rationale:* Displacement increases the free (unbound) fraction of the drug,
which is the pharmacologically active form. This leads to an intensified effect until
the free drug is redistributed or eliminated.
5. The term "first-pass effect" refers to the metabolism of a drug by which organ
before it reaches the systemic circulation?
A) Kidney
B) Liver
C) Lung
D) Heart
Correct Answer: B
*Rationale:* The first-pass effect primarily occurs in the liver via the hepatic
portal system after oral absorption. It reduces the amount of active drug reaching
systemic circulation.
6. Cytochrome P450 (CYP) enzymes are crucial for phase I drug metabolism.
Which inhibitor of CYP3A4 is commonly associated with life-threatening drug
interactions?
A) Rifampin
B) Phenytoin
C) Grapefruit juice
, D) St. John's Wort
Correct Answer: C
*Rationale:* Grapefruit juice inhibits CYP3A4, leading to increased serum
concentrations of drugs like statins and calcium channel blockers. Rifampin,
Phenytoin, and St. John's Wort are inducers.
7. A patient is prescribed a drug that is a weak acid. In an acidic environment (e.g.,
stomach), the drug will be:
A) Highly ionized and water-soluble
B) Mostly non-ionized and lipid-soluble
C) Completely bound to plasma proteins
D) Rapidly excreted in the urine
Correct Answer: B
*Rationale:* Weak acids are non-ionized in acidic environments (pH lower than
pKa). Non-ionized forms are lipid-soluble, allowing for easy absorption across cell
membranes.
8. The volume of distribution (Vd) for digoxin is approximately 500 L. This large Vd
indicates that digoxin is:
A) Confined to the vascular space
B) Highly bound to plasma proteins
C) Widely distributed into tissues
D) Rapidly cleared by the kidneys
Correct Answer: C
