Final Exam Practice Test Bank for NR565
with 300+ Latest Practice Questions and
Correct Answers Graded A+
Chamberlain/ NR 565 Final Practice Test
/ NR565 Final
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS
Question 1
A patient is prescribed a drug that is a weak base with a pKa of 8.4. In which part of the body
will this drug be most highly ionized?
A) Small intestine (pH 7.4)
B) Stomach (pH 1.5-3.5)
C) Blood (pH 7.35-7.45)
D) Urine (pH 5.0-8.0)
Answer: B
Rationale: Weak bases are more ionized in acidic environments (low pH). Ionized drugs are
poorly absorbed across lipid membranes. Weak acids are better absorbed in the stomach; weak
bases are better absorbed in the small intestine .
Question 2
Which pharmacokinetic process is most affected by first-pass metabolism?
,A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Answer: C
Rationale: First-pass metabolism occurs when a drug is metabolized in the liver before reaching
systemic circulation. This primarily affects metabolism and significantly reduces the
bioavailability of orally administered drugs .
Question 3
A drug with a narrow therapeutic index (e.g., lithium, warfarin) requires:
A) Less frequent monitoring
B) More frequent monitoring of serum drug levels
C) Administration with food only
D) Use only in pediatric patients
Answer: B
Rationale: Drugs with a narrow therapeutic index have a small margin between therapeutic and
toxic doses. Frequent monitoring of serum levels is required to ensure the dose remains within
the safe and effective window .
Question 4
The time required for half of a drug concentration to be eliminated from the body is called:
A) Peak level
B) Bioavailability
C) Half-life
D) Potency
Answer: C
Rationale: Half-life determines dosing intervals and duration of action. It is the time required for
the drug concentration in the body to be reduced by 50% .
,Question 5
What does bioavailability refer to?
A) The amount of drug that reaches systemic circulation unchanged
B) The rate at which drug is metabolized
C) The time it takes for drug to be eliminated
D) The volume of distribution
Answer: A
Rationale: Bioavailability (F) is the fraction of the administered dose that reaches systemic
circulation unchanged. IV drugs have 100% bioavailability; oral drugs have variable
bioavailability due to incomplete absorption and first-pass metabolism .
Question 6
What is the CYP450 (cytochrome P450) system?
A) Kidney enzyme system where medications are excreted
B) Liver enzyme system where medications are metabolized
C) GI tract system where medications are absorbed
D) Blood system where medications are distributed
Answer: B
Rationale: The CYP450 system is a liver enzyme system where medications are metabolized.
Enzymes can either be inducers or inhibitors and create drug-drug interactions .
Question 7
Which statement about CYP450 inducers is correct?
A) They slow down metabolism of drugs
B) They speed up metabolism, decreasing blood levels of medications
C) They have no effect on drug metabolism
D) They only affect topical medications
Answer: B
Rationale: CYP450 inducers speed up metabolism, which decreases blood levels of medications.
This can lead to subtherapeutic drug levels and treatment failure if doses are not adjusted .
, Question 8
Which of the following are CYP450 inducers? (Select all that apply)
A) Valproate and isoniazid
B) Barbiturates, St. John's Wort, and carbamazepine
C) Ketoconazole and grapefruit juice
D) Amiodarone and chloramphenicol
Answer: B
Rationale: CYP450 inducers include barbiturates, St. John's Wort, carbamazepine, rifampin,
phenytoin, griseofulvin, and sulfonylureas. Inhibitors include valproate, isoniazid, amiodarone,
ketoconazole, and grapefruit juice .
Question 9
Which statement about CYP450 inhibitors is correct?
A) They speed up metabolism of drugs
B) They inhibit metabolism, increasing blood levels of medications
C) They have no effect on drug metabolism
D) They only affect topical medications
Answer: B
Rationale: CYP450 inhibitors inhibit metabolism, which increases blood levels of medications.
This can lead to drug toxicity if not monitored .
Question 10
A medication that inhibits the metabolic activity of one or more CYP450 enzymes will:
A) Decrease levels of medications dependent on those enzymes
B) Increase levels of medications dependent on those enzymes
C) Have no effect on other medications
D) Only affect medications taken at the same time
Answer: B
with 300+ Latest Practice Questions and
Correct Answers Graded A+
Chamberlain/ NR 565 Final Practice Test
/ NR565 Final
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS
Question 1
A patient is prescribed a drug that is a weak base with a pKa of 8.4. In which part of the body
will this drug be most highly ionized?
A) Small intestine (pH 7.4)
B) Stomach (pH 1.5-3.5)
C) Blood (pH 7.35-7.45)
D) Urine (pH 5.0-8.0)
Answer: B
Rationale: Weak bases are more ionized in acidic environments (low pH). Ionized drugs are
poorly absorbed across lipid membranes. Weak acids are better absorbed in the stomach; weak
bases are better absorbed in the small intestine .
Question 2
Which pharmacokinetic process is most affected by first-pass metabolism?
,A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Answer: C
Rationale: First-pass metabolism occurs when a drug is metabolized in the liver before reaching
systemic circulation. This primarily affects metabolism and significantly reduces the
bioavailability of orally administered drugs .
Question 3
A drug with a narrow therapeutic index (e.g., lithium, warfarin) requires:
A) Less frequent monitoring
B) More frequent monitoring of serum drug levels
C) Administration with food only
D) Use only in pediatric patients
Answer: B
Rationale: Drugs with a narrow therapeutic index have a small margin between therapeutic and
toxic doses. Frequent monitoring of serum levels is required to ensure the dose remains within
the safe and effective window .
Question 4
The time required for half of a drug concentration to be eliminated from the body is called:
A) Peak level
B) Bioavailability
C) Half-life
D) Potency
Answer: C
Rationale: Half-life determines dosing intervals and duration of action. It is the time required for
the drug concentration in the body to be reduced by 50% .
,Question 5
What does bioavailability refer to?
A) The amount of drug that reaches systemic circulation unchanged
B) The rate at which drug is metabolized
C) The time it takes for drug to be eliminated
D) The volume of distribution
Answer: A
Rationale: Bioavailability (F) is the fraction of the administered dose that reaches systemic
circulation unchanged. IV drugs have 100% bioavailability; oral drugs have variable
bioavailability due to incomplete absorption and first-pass metabolism .
Question 6
What is the CYP450 (cytochrome P450) system?
A) Kidney enzyme system where medications are excreted
B) Liver enzyme system where medications are metabolized
C) GI tract system where medications are absorbed
D) Blood system where medications are distributed
Answer: B
Rationale: The CYP450 system is a liver enzyme system where medications are metabolized.
Enzymes can either be inducers or inhibitors and create drug-drug interactions .
Question 7
Which statement about CYP450 inducers is correct?
A) They slow down metabolism of drugs
B) They speed up metabolism, decreasing blood levels of medications
C) They have no effect on drug metabolism
D) They only affect topical medications
Answer: B
Rationale: CYP450 inducers speed up metabolism, which decreases blood levels of medications.
This can lead to subtherapeutic drug levels and treatment failure if doses are not adjusted .
, Question 8
Which of the following are CYP450 inducers? (Select all that apply)
A) Valproate and isoniazid
B) Barbiturates, St. John's Wort, and carbamazepine
C) Ketoconazole and grapefruit juice
D) Amiodarone and chloramphenicol
Answer: B
Rationale: CYP450 inducers include barbiturates, St. John's Wort, carbamazepine, rifampin,
phenytoin, griseofulvin, and sulfonylureas. Inhibitors include valproate, isoniazid, amiodarone,
ketoconazole, and grapefruit juice .
Question 9
Which statement about CYP450 inhibitors is correct?
A) They speed up metabolism of drugs
B) They inhibit metabolism, increasing blood levels of medications
C) They have no effect on drug metabolism
D) They only affect topical medications
Answer: B
Rationale: CYP450 inhibitors inhibit metabolism, which increases blood levels of medications.
This can lead to drug toxicity if not monitored .
Question 10
A medication that inhibits the metabolic activity of one or more CYP450 enzymes will:
A) Decrease levels of medications dependent on those enzymes
B) Increase levels of medications dependent on those enzymes
C) Have no effect on other medications
D) Only affect medications taken at the same time
Answer: B
