NU 641 Advanced Clinical Pharmacology
Midterm Exam Questions and Answers| Updated| Pass
Guaranteed| Regis
1. Which route of administration has a bioavailability of 100%?
A. Oral
B. Intravenous
C. Rectal
D. Transdermal
Answer: B. Intravenous
Rationale: IV administration delivers the entire dose directly into the systemic
circulation, bypassing absorption and first-pass metabolism. All other routes
have incomplete or variable bioavailability.
2. Sublingual nitroglycerin is used for acute angina primarily because it:
A. Is more highly protein bound
B. Is excreted unchanged in the urine
C. Has a longer half-life when swallowed
D. Avoids extensive hepatic first-pass metabolism
Answer: D. Avoids extensive hepatic first-pass metabolism
Rationale: Oral nitroglycerin is almost entirely metabolized by the liver on first
pass. Sublingual absorption drains into the systemic venous circulation,
bypassing the portal system and giving rapid onset.
Page 1
,3. A drug with a very large volume of distribution (Vd) most likely:
A. Is extensively distributed into tissues
B. Remains confined to plasma
C. Is completely bound to albumin in blood
D. Is rapidly eliminated by the kidneys only
Answer: A. Is extensively distributed into tissues
Rationale: A large Vd means the drug leaves plasma and sits in tissues (e.g.,
lipophilic drugs such as amiodarone). Drugs confined to plasma have a Vd near
3-5 L.
4. Approximately how many half-lives are required to reach steady state with
repeated dosing?
A. 1 to 2
B. 7 to 10
C. 4 to 5
D. 12 to 14
Answer: C. 4 to 5
Rationale: Steady state is reached after about 4-5 half-lives regardless of dose
size. About 94-97% of steady-state concentration is achieved by then. The
dose changes the level, not the time to reach it.
5. Which drug classically exhibits zero-order (saturable) kinetics at therapeutic
doses?
A. Amoxicillin
B. Lisinopril
C. Phenytoin
D. Metoprolol
Answer: C. Phenytoin
Rationale: Phenytoin metabolism saturates within the therapeutic range, so a
small dose increase can cause a disproportionate rise in serum concentration
and toxicity. A constant amount (not a constant fraction) is eliminated per unit
time.
Page 2
,6. The loading dose of a drug is determined primarily by its:
A. Volume of distribution
B. Clearance
C. Half-life
D. Renal excretion rate
Answer: A. Volume of distribution
Rationale: Loading dose = target concentration x Vd (divided by bioavailability
if not IV). Clearance determines the maintenance dose.
7. The maintenance dose rate needed to sustain a target plasma concentration
is determined primarily by:
A. Volume of distribution
B. Peak concentration
C. Time to maximum concentration
D. Clearance
Answer: D. Clearance
Rationale: At steady state, dosing rate = clearance x target concentration.
Reduced clearance (e.g., renal or hepatic impairment) requires dose reduction.
8. A patient taking oral contraceptives starts rifampin. What is the expected
effect?
A. Increased contraceptive levels and toxicity
B. Decreased contraceptive effectiveness due to CYP3A4 induction
C. No interaction
D. Increased renal excretion of rifampin
Answer: B. Decreased contraceptive effectiveness due to CYP3A4 induction
Rationale: Rifampin is a potent inducer of CYP3A4 and other enzymes,
accelerating metabolism of estrogen/progestins and risking contraceptive
failure. Counsel on backup contraception.
Page 3
, 9. A patient on simvastatin 40 mg is prescribed clarithromycin. The greatest
concern is:
A. Loss of statin efficacy
B. Rhabdomyolysis from CYP3A4 inhibition
C. Hypoglycemia
D. Hypokalemia
Answer: B. Rhabdomyolysis from CYP3A4 inhibition
Rationale: Clarithromycin inhibits CYP3A4, raising simvastatin levels and the
risk of myopathy and rhabdomyolysis. Hold the statin during the antibiotic
course or choose azithromycin.
10. Which of the following drugs has a narrow therapeutic index?
A. Amoxicillin
B. Famotidine
C. Acetaminophen at 650 mg
D. Digoxin
Answer: D. Digoxin
Rationale: Digoxin has a small margin between therapeutic and toxic
concentrations, necessitating level monitoring. Warfarin, lithium, and
phenytoin are other examples.
11. In a dose-response relationship, the maximal effect a drug can produce is
termed:
A. Efficacy
B. Potency
C. Affinity
D. Therapeutic index
Answer: A. Efficacy
Rationale: Efficacy is the maximum response (Emax). Potency refers to the
dose needed to produce a given effect (EC50) and is not a measure of how
large the maximum can be.
Page 4
Midterm Exam Questions and Answers| Updated| Pass
Guaranteed| Regis
1. Which route of administration has a bioavailability of 100%?
A. Oral
B. Intravenous
C. Rectal
D. Transdermal
Answer: B. Intravenous
Rationale: IV administration delivers the entire dose directly into the systemic
circulation, bypassing absorption and first-pass metabolism. All other routes
have incomplete or variable bioavailability.
2. Sublingual nitroglycerin is used for acute angina primarily because it:
A. Is more highly protein bound
B. Is excreted unchanged in the urine
C. Has a longer half-life when swallowed
D. Avoids extensive hepatic first-pass metabolism
Answer: D. Avoids extensive hepatic first-pass metabolism
Rationale: Oral nitroglycerin is almost entirely metabolized by the liver on first
pass. Sublingual absorption drains into the systemic venous circulation,
bypassing the portal system and giving rapid onset.
Page 1
,3. A drug with a very large volume of distribution (Vd) most likely:
A. Is extensively distributed into tissues
B. Remains confined to plasma
C. Is completely bound to albumin in blood
D. Is rapidly eliminated by the kidneys only
Answer: A. Is extensively distributed into tissues
Rationale: A large Vd means the drug leaves plasma and sits in tissues (e.g.,
lipophilic drugs such as amiodarone). Drugs confined to plasma have a Vd near
3-5 L.
4. Approximately how many half-lives are required to reach steady state with
repeated dosing?
A. 1 to 2
B. 7 to 10
C. 4 to 5
D. 12 to 14
Answer: C. 4 to 5
Rationale: Steady state is reached after about 4-5 half-lives regardless of dose
size. About 94-97% of steady-state concentration is achieved by then. The
dose changes the level, not the time to reach it.
5. Which drug classically exhibits zero-order (saturable) kinetics at therapeutic
doses?
A. Amoxicillin
B. Lisinopril
C. Phenytoin
D. Metoprolol
Answer: C. Phenytoin
Rationale: Phenytoin metabolism saturates within the therapeutic range, so a
small dose increase can cause a disproportionate rise in serum concentration
and toxicity. A constant amount (not a constant fraction) is eliminated per unit
time.
Page 2
,6. The loading dose of a drug is determined primarily by its:
A. Volume of distribution
B. Clearance
C. Half-life
D. Renal excretion rate
Answer: A. Volume of distribution
Rationale: Loading dose = target concentration x Vd (divided by bioavailability
if not IV). Clearance determines the maintenance dose.
7. The maintenance dose rate needed to sustain a target plasma concentration
is determined primarily by:
A. Volume of distribution
B. Peak concentration
C. Time to maximum concentration
D. Clearance
Answer: D. Clearance
Rationale: At steady state, dosing rate = clearance x target concentration.
Reduced clearance (e.g., renal or hepatic impairment) requires dose reduction.
8. A patient taking oral contraceptives starts rifampin. What is the expected
effect?
A. Increased contraceptive levels and toxicity
B. Decreased contraceptive effectiveness due to CYP3A4 induction
C. No interaction
D. Increased renal excretion of rifampin
Answer: B. Decreased contraceptive effectiveness due to CYP3A4 induction
Rationale: Rifampin is a potent inducer of CYP3A4 and other enzymes,
accelerating metabolism of estrogen/progestins and risking contraceptive
failure. Counsel on backup contraception.
Page 3
, 9. A patient on simvastatin 40 mg is prescribed clarithromycin. The greatest
concern is:
A. Loss of statin efficacy
B. Rhabdomyolysis from CYP3A4 inhibition
C. Hypoglycemia
D. Hypokalemia
Answer: B. Rhabdomyolysis from CYP3A4 inhibition
Rationale: Clarithromycin inhibits CYP3A4, raising simvastatin levels and the
risk of myopathy and rhabdomyolysis. Hold the statin during the antibiotic
course or choose azithromycin.
10. Which of the following drugs has a narrow therapeutic index?
A. Amoxicillin
B. Famotidine
C. Acetaminophen at 650 mg
D. Digoxin
Answer: D. Digoxin
Rationale: Digoxin has a small margin between therapeutic and toxic
concentrations, necessitating level monitoring. Warfarin, lithium, and
phenytoin are other examples.
11. In a dose-response relationship, the maximal effect a drug can produce is
termed:
A. Efficacy
B. Potency
C. Affinity
D. Therapeutic index
Answer: A. Efficacy
Rationale: Efficacy is the maximum response (Emax). Potency refers to the
dose needed to produce a given effect (EC50) and is not a measure of how
large the maximum can be.
Page 4
