WGU D398 INTRODUCTION TO PHARMACOLOGY |
OBJECTIVE ASSESSMENTS | OA | V1, V2 AND V3 | ALL
OA VERSIONS | 234 QUESTIONS AND ANSWERS |
2026 UPDATE | ARRANGED IN ORDER | 100%
CORRECT
WGU D398 – Introduction to Pharmacology
Objective Assessment (OA) – V1, V2, V3
234 Questions with Correct Answers & Rationales
OA VERSION 1 (Questions 1–50)
1. Which of the following is classified as a Schedule I drug?
A. Morphine
B. Diazepam
C. Anabolic steroids
D. Heroin ✅
Rationale:
Schedule I drugs have no accepted medical use and a high potential for abuse. Heroin meets both
criteria and is illegal for medical use in the United States. Morphine and diazepam are Schedule II
and IV respectively because they have approved medical uses. Anabolic steroids are Schedule III due
to medical applications with misuse risk.
2. What is one major risk associated with excessive consumption of dietary supplements?
A. To provide acute relief of symptoms
B. Epinephrine release
C. A sentinel event
D. Heart attack, stroke, or liver damage ✅
Rationale:
Excessive use of dietary supplements can lead to serious organ damage, especially liver toxicity.
Some supplements interact with prescription medications or contain undisclosed ingredients.
Because supplements are not tightly regulated, dosage inconsistencies increase risk. Cardiovascular
complications are well documented with stimulant-based supplements.
,3. What plant is known for its cardiovascular effects?
A. Solanaceae
B. Sweet wormwood
C. Cinchona bark ✅
D. Onion
Rationale:
Cinchona bark contains quinine, historically used to treat malaria and cardiac rhythm disturbances. It
has direct effects on the cardiovascular system. Sweet wormwood is associated with antimalarial
properties but not cardiovascular action. Onions and Solanaceae plants do not have primary cardiac
pharmacologic effects.
4. What is the main reason older adults are at higher risk of poisoning?
A. They have better knowledge of drug safety
B. They have a higher metabolism rate
C. They are less likely to take medications
D. They are more likely to experience medication errors and interactions ✅
Rationale:
Older adults often take multiple medications, increasing the risk of polypharmacy and drug
interactions. Age-related changes in liver and kidney function impair drug metabolism and excretion.
Cognitive decline and vision issues may also contribute to dosing errors. These combined factors
significantly raise poisoning risk.
5. The phenomenon where a patient’s positive attitude toward medication improves physical
outcomes is called:
A. Reporting bias
B. The Hawthorne effect
C. Hindsight bias
D. The placebo effect ✅
Rationale:
The placebo effect occurs when a patient experiences real improvement due to belief in treatment
rather than the treatment itself. This effect highlights the mind-body connection in healing. It is
distinct from observation-related behavior changes (Hawthorne effect). Placebos demonstrate how
expectations influence therapeutic outcomes.
6. Which route of medication administration provides the fastest systemic absorption?
A. Oral
B. Subcutaneous
C. Intramuscular
D. Intravenous ✅
,Rationale:
Intravenous administration delivers medication directly into the bloodstream, bypassing absorption
barriers. This results in immediate onset of action. Oral medications are subject to first-pass
metabolism. IM and subcutaneous routes absorb slower than IV.
7. Pharmacokinetics refers to:
A. Drug effects on the body
B. Drug classification systems
C. How the body absorbs, distributes, metabolizes, and excretes drugs ✅
D. Medication administration techniques
Rationale:
Pharmacokinetics describes what the body does to a drug over time. It includes absorption,
distribution, metabolism, and excretion (ADME). This concept helps determine dosing schedules. It
differs from pharmacodynamics, which focuses on drug effects.
8. What organ is primarily responsible for drug metabolism?
A. Kidneys
B. Lungs
C. Heart
D. Liver ✅
Rationale:
The liver contains enzymes that metabolize most medications. These enzymes chemically alter drugs
to facilitate elimination. Liver impairment can significantly affect drug levels. This is why dose
adjustments are often needed in hepatic disease.
9. What does “first-pass metabolism” mean?
A. Drug absorption through skin
B. Drug elimination via kidneys
C. Drug metabolism before reaching systemic circulation ✅
D. Drug distribution to tissues
Rationale:
First-pass metabolism occurs when oral drugs are metabolized by the liver before entering systemic
circulation. This reduces the amount of active drug available. Some medications are given via non-
oral routes to avoid this effect. It influences bioavailability.
10. What is bioavailability?
A. Drug toxicity level
B. Rate of elimination
, C. Amount of drug reaching systemic circulation ✅
D. Drug half-life
Rationale:
Bioavailability measures how much of a drug reaches circulation unchanged. Oral drugs often have
lower bioavailability due to first-pass metabolism. IV drugs have 100% bioavailability. This concept
guides dosing decisions.
11. Which term describes an unintended and harmful reaction to a medication at normal doses?
A. Side effect
B. Adverse drug reaction ✅
C. Toxicity
D. Idiosyncratic response
Rationale:
An adverse drug reaction (ADR) is a harmful or unpleasant response occurring at therapeutic doses.
ADRs may require dose adjustment or discontinuation of therapy. Side effects are expected
secondary effects that are usually mild. Toxicity generally results from overdose or accumulation.
12. Which medication route avoids first-pass metabolism?
A. Oral
B. Rectal
C. Sublingual ✅
D. Enteral
Rationale:
Sublingual medications are absorbed directly into the bloodstream through tissues under the tongue.
This bypasses the liver’s first-pass metabolism. As a result, onset of action is faster and bioavailability
is higher. Nitroglycerin is a common example.
13. What does a drug’s half-life determine?
A. Time to onset
B. How long the drug remains in the body ✅
C. Route of elimination
D. Therapeutic range
Rationale:
Half-life is the time it takes for the plasma concentration of a drug to decrease by 50%. It determines
OBJECTIVE ASSESSMENTS | OA | V1, V2 AND V3 | ALL
OA VERSIONS | 234 QUESTIONS AND ANSWERS |
2026 UPDATE | ARRANGED IN ORDER | 100%
CORRECT
WGU D398 – Introduction to Pharmacology
Objective Assessment (OA) – V1, V2, V3
234 Questions with Correct Answers & Rationales
OA VERSION 1 (Questions 1–50)
1. Which of the following is classified as a Schedule I drug?
A. Morphine
B. Diazepam
C. Anabolic steroids
D. Heroin ✅
Rationale:
Schedule I drugs have no accepted medical use and a high potential for abuse. Heroin meets both
criteria and is illegal for medical use in the United States. Morphine and diazepam are Schedule II
and IV respectively because they have approved medical uses. Anabolic steroids are Schedule III due
to medical applications with misuse risk.
2. What is one major risk associated with excessive consumption of dietary supplements?
A. To provide acute relief of symptoms
B. Epinephrine release
C. A sentinel event
D. Heart attack, stroke, or liver damage ✅
Rationale:
Excessive use of dietary supplements can lead to serious organ damage, especially liver toxicity.
Some supplements interact with prescription medications or contain undisclosed ingredients.
Because supplements are not tightly regulated, dosage inconsistencies increase risk. Cardiovascular
complications are well documented with stimulant-based supplements.
,3. What plant is known for its cardiovascular effects?
A. Solanaceae
B. Sweet wormwood
C. Cinchona bark ✅
D. Onion
Rationale:
Cinchona bark contains quinine, historically used to treat malaria and cardiac rhythm disturbances. It
has direct effects on the cardiovascular system. Sweet wormwood is associated with antimalarial
properties but not cardiovascular action. Onions and Solanaceae plants do not have primary cardiac
pharmacologic effects.
4. What is the main reason older adults are at higher risk of poisoning?
A. They have better knowledge of drug safety
B. They have a higher metabolism rate
C. They are less likely to take medications
D. They are more likely to experience medication errors and interactions ✅
Rationale:
Older adults often take multiple medications, increasing the risk of polypharmacy and drug
interactions. Age-related changes in liver and kidney function impair drug metabolism and excretion.
Cognitive decline and vision issues may also contribute to dosing errors. These combined factors
significantly raise poisoning risk.
5. The phenomenon where a patient’s positive attitude toward medication improves physical
outcomes is called:
A. Reporting bias
B. The Hawthorne effect
C. Hindsight bias
D. The placebo effect ✅
Rationale:
The placebo effect occurs when a patient experiences real improvement due to belief in treatment
rather than the treatment itself. This effect highlights the mind-body connection in healing. It is
distinct from observation-related behavior changes (Hawthorne effect). Placebos demonstrate how
expectations influence therapeutic outcomes.
6. Which route of medication administration provides the fastest systemic absorption?
A. Oral
B. Subcutaneous
C. Intramuscular
D. Intravenous ✅
,Rationale:
Intravenous administration delivers medication directly into the bloodstream, bypassing absorption
barriers. This results in immediate onset of action. Oral medications are subject to first-pass
metabolism. IM and subcutaneous routes absorb slower than IV.
7. Pharmacokinetics refers to:
A. Drug effects on the body
B. Drug classification systems
C. How the body absorbs, distributes, metabolizes, and excretes drugs ✅
D. Medication administration techniques
Rationale:
Pharmacokinetics describes what the body does to a drug over time. It includes absorption,
distribution, metabolism, and excretion (ADME). This concept helps determine dosing schedules. It
differs from pharmacodynamics, which focuses on drug effects.
8. What organ is primarily responsible for drug metabolism?
A. Kidneys
B. Lungs
C. Heart
D. Liver ✅
Rationale:
The liver contains enzymes that metabolize most medications. These enzymes chemically alter drugs
to facilitate elimination. Liver impairment can significantly affect drug levels. This is why dose
adjustments are often needed in hepatic disease.
9. What does “first-pass metabolism” mean?
A. Drug absorption through skin
B. Drug elimination via kidneys
C. Drug metabolism before reaching systemic circulation ✅
D. Drug distribution to tissues
Rationale:
First-pass metabolism occurs when oral drugs are metabolized by the liver before entering systemic
circulation. This reduces the amount of active drug available. Some medications are given via non-
oral routes to avoid this effect. It influences bioavailability.
10. What is bioavailability?
A. Drug toxicity level
B. Rate of elimination
, C. Amount of drug reaching systemic circulation ✅
D. Drug half-life
Rationale:
Bioavailability measures how much of a drug reaches circulation unchanged. Oral drugs often have
lower bioavailability due to first-pass metabolism. IV drugs have 100% bioavailability. This concept
guides dosing decisions.
11. Which term describes an unintended and harmful reaction to a medication at normal doses?
A. Side effect
B. Adverse drug reaction ✅
C. Toxicity
D. Idiosyncratic response
Rationale:
An adverse drug reaction (ADR) is a harmful or unpleasant response occurring at therapeutic doses.
ADRs may require dose adjustment or discontinuation of therapy. Side effects are expected
secondary effects that are usually mild. Toxicity generally results from overdose or accumulation.
12. Which medication route avoids first-pass metabolism?
A. Oral
B. Rectal
C. Sublingual ✅
D. Enteral
Rationale:
Sublingual medications are absorbed directly into the bloodstream through tissues under the tongue.
This bypasses the liver’s first-pass metabolism. As a result, onset of action is faster and bioavailability
is higher. Nitroglycerin is a common example.
13. What does a drug’s half-life determine?
A. Time to onset
B. How long the drug remains in the body ✅
C. Route of elimination
D. Therapeutic range
Rationale:
Half-life is the time it takes for the plasma concentration of a drug to decrease by 50%. It determines
