ATI RN Pharmacology Practice Exam 2026
with verified answers and rationale
Section 1: Pharmacokinetics & Pharmacodynamics (Questions 1–15)
1. A nurse is reviewing the pharmacokinetics of a newly prescribed medication. Which process
describes the transformation of a drug into a less active or inactive form by the liver?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Rationale: Metabolism (biotransformation) is the hepatic enzymatic conversion of drugs into
metabolites, primarily via the cytochrome P450 system. Absorption refers to movement from the
site of administration into the bloodstream; distribution is transport to tissues; excretion is
elimination, primarily renal -7.
2. A nurse is administering a medication that acts as an agonist. Which statement best describes
an agonist?
A. Blocks the receptor and prevents endogenous neurotransmitter binding
B. Binds to the receptor and produces a biological response similar to the endogenous substance
C. Binds to a site other than the receptor and enhances the natural neurotransmitter effect
D. Decreases the number of available receptors on the cell surface
Rationale: An agonist binds and activates a receptor, producing a pharmacological response similar
to the endogenous ligand. Option A describes an antagonist; Option C describes a positive allosteric
modulator; Option D describes down-regulation -7.
3. A client taking warfarin is prescribed a new medication that is a CYP450 enzyme inducer. What
is the expected effect on warfarin therapy?
A. Increased risk of bleeding due to elevated warfarin levels
B. Decreased therapeutic effect of warfarin due to increased metabolism
C. No change in warfarin effect since they use different metabolic pathways
D. Increased risk of thrombus formation due to decreased protein binding
Rationale: CYP450 enzyme inducers (e.g., rifampin, phenytoin, carbamazepine) increase warfarin
metabolism, decreasing drug levels and anticoagulant effect. This places the client at risk for
thromboembolic events. CYP450 inhibitors would have the opposite effect -7.
4. A nurse is preparing to administer a medication to a client who has a history of renal failure.
Which pharmacokinetic process should the nurse expect to be most affected?
A. Absorption
B. Distribution
C. Metabolism
D. Excretion
,Rationale: The kidneys are the primary organs responsible for drug and metabolite excretion.
Impaired renal function leads to decreased drug clearance and high risk for toxicity -5.
5. A nurse is teaching a client about the "first-pass effect." Which route of administration is most
affected by this process?
A. Intravenous
B. Sublingual
C. Oral
D. Transdermal
Rationale: Oral medications are absorbed in the GI tract and travel to the liver via the portal vein.
The liver may metabolize a large portion of the drug before it reaches systemic circulation, reducing
bioavailability -5.
6. A patient is receiving a drug with a half-life of 12 hours. Approximately how long will it take for
the drug to be considered eliminated from the body?
A. 12 hours
B. 24 hours
C. 60 hours
D. 120 hours
Rationale: It takes approximately 5 half-lives for a drug to be considered eliminated from the body.
12 hours × 5 = 60 hours -16.
7. A nurse is reviewing medication metabolism. Which factors should the nurse identify as reasons
to administer lower medication dosages? (Select all that apply.)
A. Increased medication-metabolizing enzymes
B. Liver failure
C. Kidney failure
D. Peripheral vascular disease
E. Older adult age
Rationale: Liver and kidney failure decrease drug metabolism and excretion, requiring lower doses.
Older adults have decreased hepatic and renal function. Increased metabolizing enzymes would
actually require higher doses to achieve therapeutic effect -10.
8. A nurse is preparing to administer phenobarbital to a client. Which pharmacokinetic concept
explains why this drug has a long duration of action?
A. First-pass effect
B. High lipid solubility
C. Half-life
D. Protein binding
Rationale: Half-life is the time required for drug concentration to reduce by 50%. Phenobarbital has
a long half-life (approximately 4 days), meaning it stays in the system longer and requires less
frequent dosing -5.
9. A nurse is reviewing a client's record with a new prescription for verifying the trough level of a
medication. When should the nurse schedule the blood draw?
, A. Obtain a blood specimen immediately prior to administering the next dose of medication
B. Draw the sample 30 minutes after the infusion completes
C. Draw the sample at any random time during the dosing interval
D. Wait until the client reports adverse effects before drawing the level
Rationale: The trough level represents the lowest concentration of the drug in the bloodstream. It is
measured immediately (typically 15–30 minutes) before the next scheduled dose -1-5.
10. A nurse is preparing to administer a medication that has a narrow therapeutic index. Which
action is most important?
A. Monitor serum drug levels closely
B. Administer with food to reduce GI upset
C. Use the IM route instead of IV
D. Double the dose if a dose is missed
Rationale: Medications with a narrow therapeutic index (e.g., digoxin, lithium, warfarin, phenytoin)
require close monitoring of serum levels to prevent toxicity or subtherapeutic effects -2.
11. A nurse is reviewing a prescription for a medication to be given "AC." When should the nurse
administer this drug?
A. Before meals
B. After meals
C. At bedtime
D. With food
Rationale: "AC" stands for ante cibum, meaning before meals. "PC" stands for post cibum, meaning
after meals -5.
12. A nurse is calculating the IV flow rate for a client who is to receive 1,000 mL of 0.9% Sodium
Chloride over 8 hours. The drop factor is 15 gtt/mL. What is the flow rate in gtt/min? (Round to
the nearest whole number.)
A. 21 gtt/min
B. 31 gtt/min
C. 42 gtt/min
D. 63 gtt/min
Rationale: Total volume (1,000 mL) × Drop factor (15) / Total time in minutes (480 min) = 31.25.
Rounded to the nearest whole number is 31 gtt/min -5-11.
13. A nurse is preparing to administer 0.5 g of a medication. The available dose is 250 mg tablets.
How many tablets should the nurse administer?
A. 0.5 tablets
B. 1 tablet
C. 2 tablets
D. 4 tablets
Rationale: First, convert grams to milligrams: 0.5 g = 500 mg. Divide the ordered dose (500 mg) by
the available dose (250 mg) to get 2 tablets -5-8.
with verified answers and rationale
Section 1: Pharmacokinetics & Pharmacodynamics (Questions 1–15)
1. A nurse is reviewing the pharmacokinetics of a newly prescribed medication. Which process
describes the transformation of a drug into a less active or inactive form by the liver?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Rationale: Metabolism (biotransformation) is the hepatic enzymatic conversion of drugs into
metabolites, primarily via the cytochrome P450 system. Absorption refers to movement from the
site of administration into the bloodstream; distribution is transport to tissues; excretion is
elimination, primarily renal -7.
2. A nurse is administering a medication that acts as an agonist. Which statement best describes
an agonist?
A. Blocks the receptor and prevents endogenous neurotransmitter binding
B. Binds to the receptor and produces a biological response similar to the endogenous substance
C. Binds to a site other than the receptor and enhances the natural neurotransmitter effect
D. Decreases the number of available receptors on the cell surface
Rationale: An agonist binds and activates a receptor, producing a pharmacological response similar
to the endogenous ligand. Option A describes an antagonist; Option C describes a positive allosteric
modulator; Option D describes down-regulation -7.
3. A client taking warfarin is prescribed a new medication that is a CYP450 enzyme inducer. What
is the expected effect on warfarin therapy?
A. Increased risk of bleeding due to elevated warfarin levels
B. Decreased therapeutic effect of warfarin due to increased metabolism
C. No change in warfarin effect since they use different metabolic pathways
D. Increased risk of thrombus formation due to decreased protein binding
Rationale: CYP450 enzyme inducers (e.g., rifampin, phenytoin, carbamazepine) increase warfarin
metabolism, decreasing drug levels and anticoagulant effect. This places the client at risk for
thromboembolic events. CYP450 inhibitors would have the opposite effect -7.
4. A nurse is preparing to administer a medication to a client who has a history of renal failure.
Which pharmacokinetic process should the nurse expect to be most affected?
A. Absorption
B. Distribution
C. Metabolism
D. Excretion
,Rationale: The kidneys are the primary organs responsible for drug and metabolite excretion.
Impaired renal function leads to decreased drug clearance and high risk for toxicity -5.
5. A nurse is teaching a client about the "first-pass effect." Which route of administration is most
affected by this process?
A. Intravenous
B. Sublingual
C. Oral
D. Transdermal
Rationale: Oral medications are absorbed in the GI tract and travel to the liver via the portal vein.
The liver may metabolize a large portion of the drug before it reaches systemic circulation, reducing
bioavailability -5.
6. A patient is receiving a drug with a half-life of 12 hours. Approximately how long will it take for
the drug to be considered eliminated from the body?
A. 12 hours
B. 24 hours
C. 60 hours
D. 120 hours
Rationale: It takes approximately 5 half-lives for a drug to be considered eliminated from the body.
12 hours × 5 = 60 hours -16.
7. A nurse is reviewing medication metabolism. Which factors should the nurse identify as reasons
to administer lower medication dosages? (Select all that apply.)
A. Increased medication-metabolizing enzymes
B. Liver failure
C. Kidney failure
D. Peripheral vascular disease
E. Older adult age
Rationale: Liver and kidney failure decrease drug metabolism and excretion, requiring lower doses.
Older adults have decreased hepatic and renal function. Increased metabolizing enzymes would
actually require higher doses to achieve therapeutic effect -10.
8. A nurse is preparing to administer phenobarbital to a client. Which pharmacokinetic concept
explains why this drug has a long duration of action?
A. First-pass effect
B. High lipid solubility
C. Half-life
D. Protein binding
Rationale: Half-life is the time required for drug concentration to reduce by 50%. Phenobarbital has
a long half-life (approximately 4 days), meaning it stays in the system longer and requires less
frequent dosing -5.
9. A nurse is reviewing a client's record with a new prescription for verifying the trough level of a
medication. When should the nurse schedule the blood draw?
, A. Obtain a blood specimen immediately prior to administering the next dose of medication
B. Draw the sample 30 minutes after the infusion completes
C. Draw the sample at any random time during the dosing interval
D. Wait until the client reports adverse effects before drawing the level
Rationale: The trough level represents the lowest concentration of the drug in the bloodstream. It is
measured immediately (typically 15–30 minutes) before the next scheduled dose -1-5.
10. A nurse is preparing to administer a medication that has a narrow therapeutic index. Which
action is most important?
A. Monitor serum drug levels closely
B. Administer with food to reduce GI upset
C. Use the IM route instead of IV
D. Double the dose if a dose is missed
Rationale: Medications with a narrow therapeutic index (e.g., digoxin, lithium, warfarin, phenytoin)
require close monitoring of serum levels to prevent toxicity or subtherapeutic effects -2.
11. A nurse is reviewing a prescription for a medication to be given "AC." When should the nurse
administer this drug?
A. Before meals
B. After meals
C. At bedtime
D. With food
Rationale: "AC" stands for ante cibum, meaning before meals. "PC" stands for post cibum, meaning
after meals -5.
12. A nurse is calculating the IV flow rate for a client who is to receive 1,000 mL of 0.9% Sodium
Chloride over 8 hours. The drop factor is 15 gtt/mL. What is the flow rate in gtt/min? (Round to
the nearest whole number.)
A. 21 gtt/min
B. 31 gtt/min
C. 42 gtt/min
D. 63 gtt/min
Rationale: Total volume (1,000 mL) × Drop factor (15) / Total time in minutes (480 min) = 31.25.
Rounded to the nearest whole number is 31 gtt/min -5-11.
13. A nurse is preparing to administer 0.5 g of a medication. The available dose is 250 mg tablets.
How many tablets should the nurse administer?
A. 0.5 tablets
B. 1 tablet
C. 2 tablets
D. 4 tablets
Rationale: First, convert grams to milligrams: 0.5 g = 500 mg. Divide the ordered dose (500 mg) by
the available dose (250 mg) to get 2 tablets -5-8.
