NUR 635: ADVANCED PHARMACOLOGY VERIFIED EXAM SOLUTIONS -
COMPREHENSIVE QUESTIONS AND ANSWERS - CURRENT VERSION
2026/2027 (PASS GUARANTEE)
1. Q: What are the four processes of pharmacokinetics? ANSWER Absorption,
Distribution, Metabolism, and Excretion (ADME).
2. Q: Define bioavailability. ANSWER The fraction of an administered drug
dose that reaches the systemic circulation unchanged.
3. Q: What is the first-pass effect? ANSWER The metabolism of a drug in the
liver after oral administration before it reaches systemic circulation.
4. Q: Which route of administration bypasses the first-pass effect? ANSWER
Intravenous, sublingual, transdermal, rectal, and inhalation routes.
5. Q: What is the volume of distribution (Vd)? ANSWER A theoretical volume
that relates the amount of drug in the body to its plasma concentration.
6. Q: What factors increase the volume of distribution of a drug? ANSWER
High lipid solubility, low plasma protein binding, and large molecular size.
7. Q: What is the primary organ for drug metabolism? ANSWER The liver,
primarily through cytochrome P450 enzymes.
8. Q: What are Phase I and Phase II reactions in drug metabolism? ANSWER
Phase I involves oxidation, reduction, and hydrolysis (often via CYP450). Phase
II involves conjugation reactions (glucuronidation, sulfation, acetylation).
9. Q: What is the therapeutic index (TI)? ANSWER The ratio of the toxic dose
to the effective dose (TD50/ED50). A higher TI indicates a safer drug.
10. Q: Define half-life (t½). ANSWER The time required for the plasma
concentration of a drug to decrease by 50%.
11. Q: How many half-lives does it take to reach steady-state concentration
with repeated dosing? ANSWER Approximately 4–5 half-lives.
,12. Q: What is the difference between an agonist and an antagonist?
ANSWER An agonist binds to a receptor and activates it. An antagonist binds to
a receptor but does not activate it, blocking the action of agonists.
13. Q: What is a partial agonist? ANSWER A drug that binds to a receptor and
produces a submaximal response compared to a full agonist.
14. Q: Define potency versus efficacy. ANSWER Potency is the amount of drug
needed to produce a given effect. Efficacy is the maximum biological effect a
drug can produce.
15. Q: What is the difference between competitive and non-competitive
antagonism? ANSWER Competitive antagonism is reversible and
surmountable by increasing agonist concentration. Non-competitive
antagonism is irreversible or insurmountable.
16. Q: What is tachyphylaxis? ANSWER A rapid decrease in response to a drug
after repeated doses over a short period.
17. Q: Define idiosyncratic drug reaction. ANSWER An unpredictable,
genetically determined adverse drug reaction unrelated to the drug's
pharmacological action.
18. Q: What is the cytochrome P450 enzyme system? ANSWER A family of
hepatic enzymes responsible for metabolizing many drugs. Major isoforms
include CYP3A4, CYP2D6, CYP2C9, and CYP1A2.
19. Q: Which CYP enzyme is responsible for metabolizing approximately 50%
of all drugs? ANSWER CYP3A4.
20. Q: What is a prodrug? ANSWER An inactive compound that is metabolized
in the body to produce an active drug.
Pharmacogenomics & Special Populations
21. Q: What is pharmacogenomics? ANSWER The study of how genetic
variations affect individual responses to drugs.
22. Q: What is the clinical significance of CYP2D6 poor metabolizers?
ANSWER They require lower doses of drugs metabolized by CYP2D6 (e.g.,
codeine, tramadol, many antidepressants) to avoid toxicity.
, 23. Q: Why is codeine ineffective in CYP2D6 poor metabolizers? ANSWER
Codeine is a prodrug that requires CYP2D6 conversion to morphine for
analgesic effect.
24. Q: How does renal impairment affect drug dosing? ANSWER It prolongs
drug elimination, requiring dose reduction or extended dosing intervals for
renally excreted drugs.
25. Q: How does hepatic impairment affect drug metabolism? ANSWER It
reduces the metabolism of drugs processed by the liver, potentially increasing
drug levels and toxicity.
26. Q: Why are elderly patients more susceptible to drug toxicity? ANSWER
Due to decreased renal function, reduced hepatic blood flow, lower albumin
levels, increased body fat, and decreased lean body mass.
27. Q: What is the Beers Criteria? ANSWER A list of potentially inappropriate
medications for older adults, developed by the American Geriatrics Society.
28. Q: What is the main concern with prescribing benzodiazepines to elderly
patients? ANSWER Increased risk of falls, cognitive impairment, and delirium.
29. Q: How does pregnancy affect drug pharmacokinetics? ANSWER
Increased plasma volume, decreased albumin, increased renal blood flow, and
altered hepatic enzyme activity affect drug distribution and elimination.
30. Q: What FDA pregnancy category indicates the highest risk to the fetus?
ANSWER Category X — studies show fetal abnormalities, and risks clearly
outweigh benefits.
31. Q: What is the safest analgesic during pregnancy? ANSWER
Acetaminophen (Category B).
32. Q: Why should ACE inhibitors be avoided in pregnancy? ANSWER They
cause fetal renal failure, oligohydramnios, and skull hypoplasia.
33. Q: What is the primary concern with drug use in breastfeeding mothers?
ANSWER Drug transfer into breast milk, with lipophilic, low-protein-bound, and
small-molecule drugs crossing most easily.
34. Q: Which antibiotic is generally safe during breastfeeding? ANSWER Most
penicillins and cephalosporins.
COMPREHENSIVE QUESTIONS AND ANSWERS - CURRENT VERSION
2026/2027 (PASS GUARANTEE)
1. Q: What are the four processes of pharmacokinetics? ANSWER Absorption,
Distribution, Metabolism, and Excretion (ADME).
2. Q: Define bioavailability. ANSWER The fraction of an administered drug
dose that reaches the systemic circulation unchanged.
3. Q: What is the first-pass effect? ANSWER The metabolism of a drug in the
liver after oral administration before it reaches systemic circulation.
4. Q: Which route of administration bypasses the first-pass effect? ANSWER
Intravenous, sublingual, transdermal, rectal, and inhalation routes.
5. Q: What is the volume of distribution (Vd)? ANSWER A theoretical volume
that relates the amount of drug in the body to its plasma concentration.
6. Q: What factors increase the volume of distribution of a drug? ANSWER
High lipid solubility, low plasma protein binding, and large molecular size.
7. Q: What is the primary organ for drug metabolism? ANSWER The liver,
primarily through cytochrome P450 enzymes.
8. Q: What are Phase I and Phase II reactions in drug metabolism? ANSWER
Phase I involves oxidation, reduction, and hydrolysis (often via CYP450). Phase
II involves conjugation reactions (glucuronidation, sulfation, acetylation).
9. Q: What is the therapeutic index (TI)? ANSWER The ratio of the toxic dose
to the effective dose (TD50/ED50). A higher TI indicates a safer drug.
10. Q: Define half-life (t½). ANSWER The time required for the plasma
concentration of a drug to decrease by 50%.
11. Q: How many half-lives does it take to reach steady-state concentration
with repeated dosing? ANSWER Approximately 4–5 half-lives.
,12. Q: What is the difference between an agonist and an antagonist?
ANSWER An agonist binds to a receptor and activates it. An antagonist binds to
a receptor but does not activate it, blocking the action of agonists.
13. Q: What is a partial agonist? ANSWER A drug that binds to a receptor and
produces a submaximal response compared to a full agonist.
14. Q: Define potency versus efficacy. ANSWER Potency is the amount of drug
needed to produce a given effect. Efficacy is the maximum biological effect a
drug can produce.
15. Q: What is the difference between competitive and non-competitive
antagonism? ANSWER Competitive antagonism is reversible and
surmountable by increasing agonist concentration. Non-competitive
antagonism is irreversible or insurmountable.
16. Q: What is tachyphylaxis? ANSWER A rapid decrease in response to a drug
after repeated doses over a short period.
17. Q: Define idiosyncratic drug reaction. ANSWER An unpredictable,
genetically determined adverse drug reaction unrelated to the drug's
pharmacological action.
18. Q: What is the cytochrome P450 enzyme system? ANSWER A family of
hepatic enzymes responsible for metabolizing many drugs. Major isoforms
include CYP3A4, CYP2D6, CYP2C9, and CYP1A2.
19. Q: Which CYP enzyme is responsible for metabolizing approximately 50%
of all drugs? ANSWER CYP3A4.
20. Q: What is a prodrug? ANSWER An inactive compound that is metabolized
in the body to produce an active drug.
Pharmacogenomics & Special Populations
21. Q: What is pharmacogenomics? ANSWER The study of how genetic
variations affect individual responses to drugs.
22. Q: What is the clinical significance of CYP2D6 poor metabolizers?
ANSWER They require lower doses of drugs metabolized by CYP2D6 (e.g.,
codeine, tramadol, many antidepressants) to avoid toxicity.
, 23. Q: Why is codeine ineffective in CYP2D6 poor metabolizers? ANSWER
Codeine is a prodrug that requires CYP2D6 conversion to morphine for
analgesic effect.
24. Q: How does renal impairment affect drug dosing? ANSWER It prolongs
drug elimination, requiring dose reduction or extended dosing intervals for
renally excreted drugs.
25. Q: How does hepatic impairment affect drug metabolism? ANSWER It
reduces the metabolism of drugs processed by the liver, potentially increasing
drug levels and toxicity.
26. Q: Why are elderly patients more susceptible to drug toxicity? ANSWER
Due to decreased renal function, reduced hepatic blood flow, lower albumin
levels, increased body fat, and decreased lean body mass.
27. Q: What is the Beers Criteria? ANSWER A list of potentially inappropriate
medications for older adults, developed by the American Geriatrics Society.
28. Q: What is the main concern with prescribing benzodiazepines to elderly
patients? ANSWER Increased risk of falls, cognitive impairment, and delirium.
29. Q: How does pregnancy affect drug pharmacokinetics? ANSWER
Increased plasma volume, decreased albumin, increased renal blood flow, and
altered hepatic enzyme activity affect drug distribution and elimination.
30. Q: What FDA pregnancy category indicates the highest risk to the fetus?
ANSWER Category X — studies show fetal abnormalities, and risks clearly
outweigh benefits.
31. Q: What is the safest analgesic during pregnancy? ANSWER
Acetaminophen (Category B).
32. Q: Why should ACE inhibitors be avoided in pregnancy? ANSWER They
cause fetal renal failure, oligohydramnios, and skull hypoplasia.
33. Q: What is the primary concern with drug use in breastfeeding mothers?
ANSWER Drug transfer into breast milk, with lipophilic, low-protein-bound, and
small-molecule drugs crossing most easily.
34. Q: Which antibiotic is generally safe during breastfeeding? ANSWER Most
penicillins and cephalosporins.
