PHARMACOLOGY ALL-IN-ONE
EXAM PREP||Questions And
Answers With Rationales/Graded
A+/2026 Update/100% Correct
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Topic Test: Latest 2026 Edition
80+ Questions with Rationales
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Q1–10)
Q1. A drug administered intravenously reaches peak concentration immediately.
This is because:
• A) It undergoes extensive first-pass metabolism
• B) Bioavailability is 100%
• C) It requires active transport
• D) It binds highly to plasma proteins
Rationale: IV administration bypasses absorption and first-pass metabolism,
giving 100% bioavailability.
Q2. Which route of administration is most affected by first-pass effect?
• A) Sublingual
• B) Oral
• C) Intravenous
• D) Transdermal
,Rationale: Orally absorbed drugs pass through the liver via portal circulation,
where metabolism occurs before reaching systemic circulation.
Q3. A drug has a half-life of 6 hours. How long will it take to reach steady state?
• A) 12 hours
• B) 24 hours
• C) 30 hours
• D) 48 hours
Rationale: Steady state is achieved after ~5 half-lives → 5 × 6 = 30 hours.
Q4. The volume of distribution (Vd) of a drug is 500 L. This suggests:
• A) Drug remains in plasma
• B) Drug is extensively distributed into tissues
• C) Drug is highly protein-bound
• D) Drug is renally excreted unchanged
Rationale: High Vd (>42 L in adults) indicates extensive tissue
binding/sequestration.
Q5. Which process requires energy (active transport)?
• A) Diffusion through lipid bilayer
• B) P-glycoprotein efflux pump
• C) Filtration through capillary pores
• D) Facilitated diffusion via GLUT1
Rationale: P-gp is an ATP-dependent efflux transporter.
Q6. A drug is a full agonist at the GABA-A receptor. This means:
• A) It blocks the receptor
• B) It produces maximal effect when binding
• C) It requires a second messenger
• D) It only works at low doses
, Rationale: Full agonists produce the maximal tissue response achievable.
Q7. The therapeutic index is calculated as:
• A) TD50 / ED50
• B) ED50 / TD50
• C) LD50 / ED50
• D) ED50 / LD50
Rationale: TI = toxic dose for 50% / effective dose for 50%. Lower TI = narrower
safety margin.
Q8. A drug with zero-order kinetics:
• A) Has constant half-life
• B) Removes constant amount per hour
• C) Follows first-order at low doses
• D) Is always administered orally
Rationale: Zero-order (e.g., phenytoin, ethanol) eliminates constant mg/hr, not
fraction.
Q9. Which CYP450 enzyme is involved in many drug-drug interactions and
metabolizes warfarin?
• A) CYP1A2
• B) CYP2C9
• C) CYP2D6
• D) CYP3A4
Rationale: CYP2C9 metabolizes warfarin, phenytoin, NSAIDs. Genetic variants
affect dosing.
Q10. Grapefruit juice inhibits CYP3A4. Co-administration with simvastatin leads
to:
• A) Increased simvastatin levels → toxicity risk
• B) Decreased simvastatin levels
EXAM PREP||Questions And
Answers With Rationales/Graded
A+/2026 Update/100% Correct
/Instant Download
Topic Test: Latest 2026 Edition
80+ Questions with Rationales
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Q1–10)
Q1. A drug administered intravenously reaches peak concentration immediately.
This is because:
• A) It undergoes extensive first-pass metabolism
• B) Bioavailability is 100%
• C) It requires active transport
• D) It binds highly to plasma proteins
Rationale: IV administration bypasses absorption and first-pass metabolism,
giving 100% bioavailability.
Q2. Which route of administration is most affected by first-pass effect?
• A) Sublingual
• B) Oral
• C) Intravenous
• D) Transdermal
,Rationale: Orally absorbed drugs pass through the liver via portal circulation,
where metabolism occurs before reaching systemic circulation.
Q3. A drug has a half-life of 6 hours. How long will it take to reach steady state?
• A) 12 hours
• B) 24 hours
• C) 30 hours
• D) 48 hours
Rationale: Steady state is achieved after ~5 half-lives → 5 × 6 = 30 hours.
Q4. The volume of distribution (Vd) of a drug is 500 L. This suggests:
• A) Drug remains in plasma
• B) Drug is extensively distributed into tissues
• C) Drug is highly protein-bound
• D) Drug is renally excreted unchanged
Rationale: High Vd (>42 L in adults) indicates extensive tissue
binding/sequestration.
Q5. Which process requires energy (active transport)?
• A) Diffusion through lipid bilayer
• B) P-glycoprotein efflux pump
• C) Filtration through capillary pores
• D) Facilitated diffusion via GLUT1
Rationale: P-gp is an ATP-dependent efflux transporter.
Q6. A drug is a full agonist at the GABA-A receptor. This means:
• A) It blocks the receptor
• B) It produces maximal effect when binding
• C) It requires a second messenger
• D) It only works at low doses
, Rationale: Full agonists produce the maximal tissue response achievable.
Q7. The therapeutic index is calculated as:
• A) TD50 / ED50
• B) ED50 / TD50
• C) LD50 / ED50
• D) ED50 / LD50
Rationale: TI = toxic dose for 50% / effective dose for 50%. Lower TI = narrower
safety margin.
Q8. A drug with zero-order kinetics:
• A) Has constant half-life
• B) Removes constant amount per hour
• C) Follows first-order at low doses
• D) Is always administered orally
Rationale: Zero-order (e.g., phenytoin, ethanol) eliminates constant mg/hr, not
fraction.
Q9. Which CYP450 enzyme is involved in many drug-drug interactions and
metabolizes warfarin?
• A) CYP1A2
• B) CYP2C9
• C) CYP2D6
• D) CYP3A4
Rationale: CYP2C9 metabolizes warfarin, phenytoin, NSAIDs. Genetic variants
affect dosing.
Q10. Grapefruit juice inhibits CYP3A4. Co-administration with simvastatin leads
to:
• A) Increased simvastatin levels → toxicity risk
• B) Decreased simvastatin levels
