ATI Pharmacology Exam 2: Pharmacokinetics Study Guide 2026
|Questions |Answers |Rationales
1. Which phase of pharmacokinetics involves the movement of a drug from its
site of administration into the blood?
A. Distribution
B. Metabolism
C. Excretion
D. Absorption
Answer: D
Rationale: Absorption is the process of moving a drug from its administration site into the
systemic circulation.
2. A nurse is administering an oral medication that undergoes a high first-pass
effect. Which statement is true regarding this medication?
A. The drug will have high bioavailability.
B. The drug bypasses the liver entirely.
C. The drug must be administered via the intravenous route to be effective.
D. A large portion of the drug is inactivated by the liver before reaching systemic circulation.
Answer: D
Rationale: The first-pass effect refers to the metabolism of a drug by the liver after being
absorbed from the GI tract and before reaching the rest of the body.
,3. Which route of administration provides 100% bioavailability?
A. Oral (PO)
B. Subcutaneous (SQ)
C. Intramuscular (IM)
D. Intravenous (IV)
Answer: D
Rationale: Intravenous administration puts the drug directly into the bloodstream,
resulting in 100% bioavailability.
4. A patient has low serum albumin levels. How does this affect the distribution
of a highly protein-bound drug?
A. The drug will be less effective.
B. Distribution will be delayed significantly.
C. The drug will be excreted faster.
D. There will be more free, active drug in the bloodstream, increasing the risk of toxicity.
Answer: D
Rationale: Low albumin means fewer binding sites, leading to an increase in free
(unbound) drug, which is the active form that can cause toxicity.
5. What is the primary site of drug metabolism in the human body?
A. Kidneys
B. Small Intestine
C. Liver
D. Lungs
Answer: C
Rationale: The liver is the primary organ responsible for the chemical alteration of drugs
(metabolism).
, 6. The nurse knows that ‘half-life’ refers to the time required for:
A. The amount of drug in the body to decrease by 50%.
B. The drug to be completely eliminated from the body.
C. The drug to reach peak concentration.
D. The drug to start working.
Answer: A
Rationale: Half-life is the time it takes for the concentration of a drug in the plasma to
reduce to half of its initial value.
7. If a drug has a half-life of 4 hours, how much of a 100mg dose will remain in
the body after 8 hours?
A. 50mg
B. 0mg
C. 12.5mg
D. 25mg
Answer: D
Rationale: After 4 hours (1 half-life), 50mg remains. After another 4 hours (2 half-lives),
50% of 50mg remains, which is 25mg.
8. Which laboratory value is the most important to monitor for a drug excreted
primarily by the kidneys?
A. ALT and AST
B. Serum Creatinine
C. White blood cell count
D. Serum Amylase
Answer: B
Rationale: Creatinine and BUN are primary indicators of renal function, which dictates
how well a drug is excreted.
|Questions |Answers |Rationales
1. Which phase of pharmacokinetics involves the movement of a drug from its
site of administration into the blood?
A. Distribution
B. Metabolism
C. Excretion
D. Absorption
Answer: D
Rationale: Absorption is the process of moving a drug from its administration site into the
systemic circulation.
2. A nurse is administering an oral medication that undergoes a high first-pass
effect. Which statement is true regarding this medication?
A. The drug will have high bioavailability.
B. The drug bypasses the liver entirely.
C. The drug must be administered via the intravenous route to be effective.
D. A large portion of the drug is inactivated by the liver before reaching systemic circulation.
Answer: D
Rationale: The first-pass effect refers to the metabolism of a drug by the liver after being
absorbed from the GI tract and before reaching the rest of the body.
,3. Which route of administration provides 100% bioavailability?
A. Oral (PO)
B. Subcutaneous (SQ)
C. Intramuscular (IM)
D. Intravenous (IV)
Answer: D
Rationale: Intravenous administration puts the drug directly into the bloodstream,
resulting in 100% bioavailability.
4. A patient has low serum albumin levels. How does this affect the distribution
of a highly protein-bound drug?
A. The drug will be less effective.
B. Distribution will be delayed significantly.
C. The drug will be excreted faster.
D. There will be more free, active drug in the bloodstream, increasing the risk of toxicity.
Answer: D
Rationale: Low albumin means fewer binding sites, leading to an increase in free
(unbound) drug, which is the active form that can cause toxicity.
5. What is the primary site of drug metabolism in the human body?
A. Kidneys
B. Small Intestine
C. Liver
D. Lungs
Answer: C
Rationale: The liver is the primary organ responsible for the chemical alteration of drugs
(metabolism).
, 6. The nurse knows that ‘half-life’ refers to the time required for:
A. The amount of drug in the body to decrease by 50%.
B. The drug to be completely eliminated from the body.
C. The drug to reach peak concentration.
D. The drug to start working.
Answer: A
Rationale: Half-life is the time it takes for the concentration of a drug in the plasma to
reduce to half of its initial value.
7. If a drug has a half-life of 4 hours, how much of a 100mg dose will remain in
the body after 8 hours?
A. 50mg
B. 0mg
C. 12.5mg
D. 25mg
Answer: D
Rationale: After 4 hours (1 half-life), 50mg remains. After another 4 hours (2 half-lives),
50% of 50mg remains, which is 25mg.
8. Which laboratory value is the most important to monitor for a drug excreted
primarily by the kidneys?
A. ALT and AST
B. Serum Creatinine
C. White blood cell count
D. Serum Amylase
Answer: B
Rationale: Creatinine and BUN are primary indicators of renal function, which dictates
how well a drug is excreted.
