PHARMACOLOGY EXAMINATION PREPARATION QUESTION
BANK COMPLETE WITH VERIFIED ANSWERS
1. Which of the following best describes the term used for what the
body does to a drug, including absorption, distribution, metabolism,
and excretion?
A) Pharmacodynamics
B) Pharmacotherapeutics
C) Pharmacokinetics
D) Pharmacognosy
Answer: C
Rationale: Pharmacokinetics is the study of what the body does to a
drug, specifically involving the processes of absorption, distribution,
metabolism, and excretion (ADME). Understanding these principles is
foundational for safe medication administration and predicting patient
responses.
2. What is the primary function of an agonist drug when it binds to a
receptor site?
A) To block the receptor and prevent a response
B) To bind to the receptor and produce a response
C) To enhance the metabolism of other drugs
D) To increase the excretion of the drug
Answer: B
Rationale: An agonist is a drug that binds to a receptor and activates it
to produce a physiological response. An antagonist, conversely, binds to
a receptor but does not produce a response, instead blocking other
substances from binding.
,3. Which route of medication administration has the highest
bioavailability?
A) Oral
B) Rectal
C) Intravenous
D) Subcutaneous
Answer: C
Rationale: Intravenous administration bypasses the absorption phase
entirely, delivering the drug directly into the bloodstream, resulting in
100% bioavailability.
4. A nurse is preparing to administer a medication that is highly
protein-bound. What should the nurse monitor for?
A) Increased risk of toxicity due to higher free drug levels
B) Decreased therapeutic effect due to rapid excretion
C) Increased rate of absorption in the stomach
D) Decreased risk of drug interactions
Answer: A
Rationale: Drugs that are highly protein-bound compete for binding
sites on albumin. If another highly protein-bound drug is administered,
it can displace the first drug, increasing the free (unbound) active drug
level and potentially causing toxicity.
5. Which term describes the time it takes for the body to eliminate
half of a drug dose?
A) Onset of action
B) Peak effect
C) Half-life
D) Duration of action
Answer: C
,Rationale: The half-life of a drug is the time required for the amount of
drug in the body to decrease by 50%. It determines the frequency of
dosing and the time needed to reach a steady state.
6. What is the primary site of drug metabolism in the body?
A) Kidneys
B) Liver
C) Lungs
D) Stomach
Answer: B
Rationale: The liver is the primary organ for drug metabolism, primarily
through the cytochrome P450 enzyme system, which transforms lipid-
soluble drugs into water-soluble compounds for excretion.
7. Which of the following describes a drug that binds to a receptor and
produces a weaker response than a full agonist?
A) Antagonist
B) Partial agonist
C) Inverse agonist
D) Competitive antagonist
Answer: B
Rationale: A partial agonist binds to the receptor and activates it, but
produces a lower maximal response compared to a full agonist,
regardless of the dose.
8. A patient taking warfarin is prescribed a medication that inhibits
the cytochrome P450 enzyme system. What effect will this have on
the warfarin?
A) Decreased warfarin effect
B) Increased warfarin effect and risk of bleeding
, C) No change in warfarin effect
D) Rapid excretion of warfarin
Answer: B
Rationale: Inhibition of CYP450 enzymes decreases the metabolism of
warfarin, leading to increased blood levels of warfarin, which enhances
its anticoagulant effect and increases the risk of bleeding.
9. Which of the following is an example of a non-competitive
antagonist?
A) A drug that binds to the same site as the agonist and can be
overcome by increasing the agonist dose
B) A drug that binds to a different site on the receptor and permanently
alters its shape
C) A drug that mimics the action of the endogenous ligand
D) A drug that increases the metabolism of the agonist
Answer: B
Rationale: Non-competitive antagonists bind to an allosteric site on the
receptor, causing a conformational change that prevents the agonist
from binding or producing an effect, regardless of the agonist
concentration.
10. What is the term for the ratio of a drug's toxic dose to its
therapeutic dose?
A) Bioavailability
B) Therapeutic index
C) Potency
D) Efficacy
Answer: B
Rationale: The therapeutic index is the ratio of the median toxic dose
BANK COMPLETE WITH VERIFIED ANSWERS
1. Which of the following best describes the term used for what the
body does to a drug, including absorption, distribution, metabolism,
and excretion?
A) Pharmacodynamics
B) Pharmacotherapeutics
C) Pharmacokinetics
D) Pharmacognosy
Answer: C
Rationale: Pharmacokinetics is the study of what the body does to a
drug, specifically involving the processes of absorption, distribution,
metabolism, and excretion (ADME). Understanding these principles is
foundational for safe medication administration and predicting patient
responses.
2. What is the primary function of an agonist drug when it binds to a
receptor site?
A) To block the receptor and prevent a response
B) To bind to the receptor and produce a response
C) To enhance the metabolism of other drugs
D) To increase the excretion of the drug
Answer: B
Rationale: An agonist is a drug that binds to a receptor and activates it
to produce a physiological response. An antagonist, conversely, binds to
a receptor but does not produce a response, instead blocking other
substances from binding.
,3. Which route of medication administration has the highest
bioavailability?
A) Oral
B) Rectal
C) Intravenous
D) Subcutaneous
Answer: C
Rationale: Intravenous administration bypasses the absorption phase
entirely, delivering the drug directly into the bloodstream, resulting in
100% bioavailability.
4. A nurse is preparing to administer a medication that is highly
protein-bound. What should the nurse monitor for?
A) Increased risk of toxicity due to higher free drug levels
B) Decreased therapeutic effect due to rapid excretion
C) Increased rate of absorption in the stomach
D) Decreased risk of drug interactions
Answer: A
Rationale: Drugs that are highly protein-bound compete for binding
sites on albumin. If another highly protein-bound drug is administered,
it can displace the first drug, increasing the free (unbound) active drug
level and potentially causing toxicity.
5. Which term describes the time it takes for the body to eliminate
half of a drug dose?
A) Onset of action
B) Peak effect
C) Half-life
D) Duration of action
Answer: C
,Rationale: The half-life of a drug is the time required for the amount of
drug in the body to decrease by 50%. It determines the frequency of
dosing and the time needed to reach a steady state.
6. What is the primary site of drug metabolism in the body?
A) Kidneys
B) Liver
C) Lungs
D) Stomach
Answer: B
Rationale: The liver is the primary organ for drug metabolism, primarily
through the cytochrome P450 enzyme system, which transforms lipid-
soluble drugs into water-soluble compounds for excretion.
7. Which of the following describes a drug that binds to a receptor and
produces a weaker response than a full agonist?
A) Antagonist
B) Partial agonist
C) Inverse agonist
D) Competitive antagonist
Answer: B
Rationale: A partial agonist binds to the receptor and activates it, but
produces a lower maximal response compared to a full agonist,
regardless of the dose.
8. A patient taking warfarin is prescribed a medication that inhibits
the cytochrome P450 enzyme system. What effect will this have on
the warfarin?
A) Decreased warfarin effect
B) Increased warfarin effect and risk of bleeding
, C) No change in warfarin effect
D) Rapid excretion of warfarin
Answer: B
Rationale: Inhibition of CYP450 enzymes decreases the metabolism of
warfarin, leading to increased blood levels of warfarin, which enhances
its anticoagulant effect and increases the risk of bleeding.
9. Which of the following is an example of a non-competitive
antagonist?
A) A drug that binds to the same site as the agonist and can be
overcome by increasing the agonist dose
B) A drug that binds to a different site on the receptor and permanently
alters its shape
C) A drug that mimics the action of the endogenous ligand
D) A drug that increases the metabolism of the agonist
Answer: B
Rationale: Non-competitive antagonists bind to an allosteric site on the
receptor, causing a conformational change that prevents the agonist
from binding or producing an effect, regardless of the agonist
concentration.
10. What is the term for the ratio of a drug's toxic dose to its
therapeutic dose?
A) Bioavailability
B) Therapeutic index
C) Potency
D) Efficacy
Answer: B
Rationale: The therapeutic index is the ratio of the median toxic dose
