NR 293: Pharmacology for Nursing Practice Midterm Exam The Ultimate Study Companion and Exam Preparation Manual: In-Depth Concept Review, Complete Test Bank, Realistic Practice Questions, and Final Knowledge Assessment

A nursing student is reviewing the difference between pharmacodynamics and pharmacokinetics. Which statement best defines pharmacodynamics? A. It describes how the body absorbs, distributes, metabolizes, and excretes a drug. B. It explains how a medication acts on the body to produce therapeutic and adverse effects. C. It determines how the formulation of a medication influences its dissolution. D. It describes how quickly a medication is eliminated by the kidneys. Correct Answer: B. It explains how a medication acts on the body to produce therapeutic and adverse effects. Rationale: Pharmacodynamics refers to what a drug does to the body, including its mechanism of action, therapeutic effects, and adverse effects. Pharmacokinetics describes what the body does to the drug, including absorption, distribution, metabolism, and excretion. Dosage-form dissolution is primarily related to pharmaceutics, while renal elimination is one component of pharmacokinetics. Question 2 A patient asks why factors such as age, liver function, and kidney function can alter the effects of medications. Which pharmacological concept should the nurse explain? A. Pharmacodynamics B. Pharmacokinetics C. Pharmacogenomics D. Pharmaceutics Correct Answer: B. Pharmacokinetics Rationale: Pharmacokinetics describes the movement of a medication through the body, including absorption, distribution, metabolism, and excretion. Age and changes in organ function can significantly affect these processes. Pharmacodynamics focuses on drug effects, pharmacogenomics addresses genetic influences on drug response, and pharmaceutics concerns medication formulation and dosage forms. Question 3 Two tablets contain the same medication and dose, but one dissolves much faster than the other. Which area of pharmacology best explains this difference? A. Pharmacodynamics B. Toxicology C. Pharmaceutics D. Pharmacokinetics Correct Answer: C. Pharmaceutics Rationale: Pharmaceutics examines how a medication's formulation, dosage form, and manufacturing characteristics affect dissolution and drug availability. Factors such as tablet coating, compression, and release design can change how quickly a drug dissolves. Pharmacodynamics concerns drug effects, pharmacokinetics concerns drug movement through the body, and toxicology focuses on harmful effects. Question 4 A medication binds to a specific enzyme inside a target cell and prevents the enzyme from carrying out its normal function. Which mechanism of drug action is demonstrated? A. Selective enzyme inhibition B. Passive diffusion C. Protein displacement D. Renal filtration Correct Answer: A. Selective enzyme inhibition Rationale: Selective enzyme interaction occurs when a medication binds to an enzyme and changes its activity. In this situation, the medication inhibits the enzyme and prevents its normal function. Passive diffusion describes drug movement across membranes, protein displacement affects the amount of free drug in circulation, and renal filtration contributes to drug elimination. Question 5 A patient requires a medication that will produce a rapid therapeutic effect but does not have intravenous access. Which dosage form would generally be absorbed most rapidly? A. Extended-release oral tablet B. Enteric-coated tablet C. Sublingual tablet D. Standard oral capsule Correct Answer: C. Sublingual tablet Rationale: Sublingual medications dissolve beneath the tongue and are absorbed through the highly vascular oral mucosa, allowing relatively rapid onset. They also largely bypass the gastrointestinal tract and first-pass hepatic metabolism. Extendedrelease tablets, enteric-coated tablets, and standard capsules generally require gastrointestinal processing and therefore have slower absorption. Question 6 A medication undergoes extensive first-pass metabolism. What should the nurse expect when the medication is administered orally? A. The entire dose immediately enters systemic circulation. B. The medication is eliminated before it can be absorbed. C. A portion of the medication is metabolized before entering systemic circulation. D. The medication completely bypasses hepatic metabolism. Correct Answer: C. A portion of the medication is metabolized before entering systemic circulation. Rationale: With first-pass metabolism, an orally administered medication is absorbed from the gastrointestinal tract and transported through the portal circulation to the liver. The liver metabolizes part of the medication before it reaches systemic circulation, thereby reducing its bioavailability. As a result, an oral dose may need to be larger than an equivalent intravenous or sublingual dose. Question 7 The prescriber wants a medication to avoid first-pass hepatic metabolism. Which route would be most appropriate? A. Oral tablet B. Oral capsule C. Sublingual tablet D. Oral elixir Correct Answer: C. Sublingual tablet Rationale: Sublingual medications are absorbed directly through the oral mucosa into systemic circulation and largely avoid first-pass hepatic metabolism. Oral tablets, capsules, and elixirs are absorbed through the gastrointestinal tract and commonly pass through the liver before reaching systemic circulation. Intravenous and transdermal administration also avoids the initial first-pass effect. Question 8 A patient receives 400 mg of a medication with a half-life of 2 hours. If no additional doses are administered, approximately how much medication will remain in the body after 6 hours? A. 200 mg B. 100 mg C. 50 mg D. 25 mg Correct Answer: C. 50 mg Rationale: Six hours represents three half-lives: • After 2 hours: 200 mg remains. • After 4 hours: 100 mg remains. • After 6 hours: 50 mg remains. Therefore, approximately 50 mg remains after 6 hours. A medication's half-life is the time required for its amount in the body to decrease by approximately one-half. Question 9 A patient receives a medication intravenously. Which organs are expected to receive a substantial amount of the medication early because of their high blood flow? A. Skin and adipose tissue B. Heart and liver C. Tendons and ligaments D. Skeletal muscle and bone Correct Answer: B. Heart and liver Rationale: Highly perfused organs, including the heart, liver, kidneys, and brain, receive medications relatively rapidly following systemic administration. In comparison, adipose tissue, bone, skin, and resting skeletal muscle generally have lower blood flow and receive medications more slowly. Drug distribution is also influenced by tissue permeability, protein binding, and lipid solubility. Question 10 Which tissue would generally receive a systemically administered medication more slowly than a highly perfused organ such as the liver? A. Heart B. Kidney C. Adipose tissue D. Brain Correct Answer: C. Adipose tissue Rationale: Adipose tissue has relatively low blood flow compared with highly perfused organs such as the liver, kidneys, heart, and brain. Consequently, medications generally reach adipose tissue more slowly. However, lipid-soluble medications may accumulate in fat over time, potentially prolonging their effects even after blood concentrations begin to decrease.