BSN3A Pharmacology – Exam Practice
Questions & Verified Answers with
Rationales (2026/2027 Latest Update) –
Comprehensive 250-Question Practice Exam
Question 1:
The study of how drugs move through the body, including absorption, distribution,
metabolism, and excretion, is known as:
A) Pharmacodynamics
B) Pharmacokinetics
C) Pharmacotherapeutics
D) Toxicology
Correct Answer: B) Pharmacokinetics
Rationale: Pharmacokinetics is the study of drug movement through the body,
including absorption, distribution, metabolism, and excretion (ADME).
Pharmacodynamics is the study of what drugs do to the body. Pharmacotherapeutics is
the use of drugs to treat disease .
Question 2:
The study of what drugs do to the body is known as:
A) Pharmacokinetics
B) Pharmacodynamics
C) Pharmacotherapeutics
D) Toxicology
Correct Answer: B) Pharmacodynamics
Rationale: Pharmacodynamics is the study of the biochemical and physiological effects
of drugs on the body. It focuses on drug-receptor interactions, mechanisms of action,
and dose-response relationships .
,Question 3:
What is the primary site of drug metabolism in the body?
A) Kidneys
B) Liver
C) Lungs
D) Skin
Correct Answer: B) Liver
Rationale: The liver is the primary site of drug metabolism. The cytochrome P450
enzyme system in the liver is responsible for metabolizing many drugs. The kidneys are
the primary site of excretion .
Question 4:
What is the primary route of drug excretion from the body?
A) Liver
B) Kidneys
C) Lungs
D) Skin
Correct Answer: B) Kidneys
Rationale: The kidneys are the primary route of drug excretion. Drugs and their
metabolites are filtered by the glomerulus and excreted in urine. The liver excretes drugs
in bile, and the lungs excrete volatile substances .
Question 5:
Which route of drug administration bypasses first-pass metabolism?
A) Oral
B) Sublingual
C) Rectal
D) Intramuscular
,Correct Answer: D) Intramuscular
Rationale: Parenteral routes (IV, IM, subcutaneous) bypass first-pass metabolism
because drugs administered this way enter the systemic circulation directly. Oral
medications undergo first-pass metabolism in the liver, reducing bioavailability .
Question 6:
The term "half-life" of a drug refers to:
A) The time it takes for a drug to reach peak plasma concentration
B) The time it takes for the amount of drug in the body to decrease by 50%
C) The time it takes for a drug to be completely eliminated from the body
D) The time it takes for a drug to be absorbed
Correct Answer: B) The time it takes for the amount of drug in the body to
decrease by 50%
Rationale: Half-life (t½) is the time required for the plasma concentration of a drug to
decrease by 50%. It is a key pharmacokinetic parameter used to determine dosing
intervals and predict drug accumulation .
Question 7:
A drug that binds to a receptor and produces a response is called:
A) Antagonist
B) Agonist
C) Partial agonist
D) Inverse agonist
Correct Answer: B) Agonist
Rationale: An agonist is a drug that binds to a receptor and activates it, producing a
biological response. An antagonist binds to a receptor but does not activate it; instead,
it blocks the action of agonists .
, Question 8:
A drug that binds to a receptor and blocks the action of an agonist is called:
A) Agonist
B) Antagonist
C) Partial agonist
D) Inverse agonist
Correct Answer: B) Antagonist
Rationale: An antagonist binds to a receptor without activating it and prevents the
receptor from being activated by an agonist. This blocks the biological response .
Question 9:
What is the therapeutic index of a drug?
A) The ratio of the toxic dose to the therapeutic dose
B) The ratio of the dose needed for effect to the dose that causes toxicity
C) A measure of drug safety
D) All of the above
Correct Answer: D) All of the above
Rationale: The therapeutic index (TI) is the ratio of the toxic dose to the therapeutic
dose. A narrow therapeutic index indicates that the drug has a small margin of safety,
meaning the difference between effective and toxic doses is small. Drugs with a narrow
TI require careful monitoring (e.g., digoxin, lithium) .
Question 10:
Which drug has a narrow therapeutic range?
A) Penicillin
B) Lithium
C) Acetaminophen
D) Amoxicillin
Correct Answer: B) Lithium
Questions & Verified Answers with
Rationales (2026/2027 Latest Update) –
Comprehensive 250-Question Practice Exam
Question 1:
The study of how drugs move through the body, including absorption, distribution,
metabolism, and excretion, is known as:
A) Pharmacodynamics
B) Pharmacokinetics
C) Pharmacotherapeutics
D) Toxicology
Correct Answer: B) Pharmacokinetics
Rationale: Pharmacokinetics is the study of drug movement through the body,
including absorption, distribution, metabolism, and excretion (ADME).
Pharmacodynamics is the study of what drugs do to the body. Pharmacotherapeutics is
the use of drugs to treat disease .
Question 2:
The study of what drugs do to the body is known as:
A) Pharmacokinetics
B) Pharmacodynamics
C) Pharmacotherapeutics
D) Toxicology
Correct Answer: B) Pharmacodynamics
Rationale: Pharmacodynamics is the study of the biochemical and physiological effects
of drugs on the body. It focuses on drug-receptor interactions, mechanisms of action,
and dose-response relationships .
,Question 3:
What is the primary site of drug metabolism in the body?
A) Kidneys
B) Liver
C) Lungs
D) Skin
Correct Answer: B) Liver
Rationale: The liver is the primary site of drug metabolism. The cytochrome P450
enzyme system in the liver is responsible for metabolizing many drugs. The kidneys are
the primary site of excretion .
Question 4:
What is the primary route of drug excretion from the body?
A) Liver
B) Kidneys
C) Lungs
D) Skin
Correct Answer: B) Kidneys
Rationale: The kidneys are the primary route of drug excretion. Drugs and their
metabolites are filtered by the glomerulus and excreted in urine. The liver excretes drugs
in bile, and the lungs excrete volatile substances .
Question 5:
Which route of drug administration bypasses first-pass metabolism?
A) Oral
B) Sublingual
C) Rectal
D) Intramuscular
,Correct Answer: D) Intramuscular
Rationale: Parenteral routes (IV, IM, subcutaneous) bypass first-pass metabolism
because drugs administered this way enter the systemic circulation directly. Oral
medications undergo first-pass metabolism in the liver, reducing bioavailability .
Question 6:
The term "half-life" of a drug refers to:
A) The time it takes for a drug to reach peak plasma concentration
B) The time it takes for the amount of drug in the body to decrease by 50%
C) The time it takes for a drug to be completely eliminated from the body
D) The time it takes for a drug to be absorbed
Correct Answer: B) The time it takes for the amount of drug in the body to
decrease by 50%
Rationale: Half-life (t½) is the time required for the plasma concentration of a drug to
decrease by 50%. It is a key pharmacokinetic parameter used to determine dosing
intervals and predict drug accumulation .
Question 7:
A drug that binds to a receptor and produces a response is called:
A) Antagonist
B) Agonist
C) Partial agonist
D) Inverse agonist
Correct Answer: B) Agonist
Rationale: An agonist is a drug that binds to a receptor and activates it, producing a
biological response. An antagonist binds to a receptor but does not activate it; instead,
it blocks the action of agonists .
, Question 8:
A drug that binds to a receptor and blocks the action of an agonist is called:
A) Agonist
B) Antagonist
C) Partial agonist
D) Inverse agonist
Correct Answer: B) Antagonist
Rationale: An antagonist binds to a receptor without activating it and prevents the
receptor from being activated by an agonist. This blocks the biological response .
Question 9:
What is the therapeutic index of a drug?
A) The ratio of the toxic dose to the therapeutic dose
B) The ratio of the dose needed for effect to the dose that causes toxicity
C) A measure of drug safety
D) All of the above
Correct Answer: D) All of the above
Rationale: The therapeutic index (TI) is the ratio of the toxic dose to the therapeutic
dose. A narrow therapeutic index indicates that the drug has a small margin of safety,
meaning the difference between effective and toxic doses is small. Drugs with a narrow
TI require careful monitoring (e.g., digoxin, lithium) .
Question 10:
Which drug has a narrow therapeutic range?
A) Penicillin
B) Lithium
C) Acetaminophen
D) Amoxicillin
Correct Answer: B) Lithium
