Pharmacokinetics Quiz Questions
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Questions and Answers

Which route of administration completely bypasses hepatic first pass metabolism?

  • Oral route
  • Sublingual route (correct)
  • Rectal route
  • None of the above
  • What is the best dose interval?

  • Double the half-life to avoid drug concentration fluctuations
  • 50% of the half-life to avoid drug accumulation
  • Not related to the half-life
  • Half-life to reach the steady-state concentration in a reasonable time (correct)
  • In zero-order kinetics, the concentration-time relationship is described by:

  • A fixed fraction of the dose is eliminated per day
  • The order zero describes the power of the time in the equation related to the concentration
  • A straight line graph of drug concentration against time (correct)
  • An exponential equation
  • Which of the following is NOT an aspect of pharmacokinetics?

    <p>Actions</p> Signup and view all the answers

    The half-life of a drug is the time after which:

    <p>Plasma drug concentration is halved</p> Signup and view all the answers

    A full agonist is a drug that possesses:

    <p>Both affinity and efficacy</p> Signup and view all the answers

    What is the most common mechanism of drug action?

    <p>Receptors mechanism</p> Signup and view all the answers

    What is an 'all or non-response' curve used to calculate?

    <p>LD50</p> Signup and view all the answers

    What is the cause of salbutamol tolerance in bronchial asthma?

    <p>Down regulation of beta-2 receptors</p> Signup and view all the answers

    Which statement about placebo is incorrect?

    <p>An active substance</p> Signup and view all the answers

    What type of adverse drug reaction is pharmacogenetic effect?

    <p>Pharmacogenetic effect</p> Signup and view all the answers

    Which statement about corticosteroid receptors is correct?

    <p>All of the above</p> Signup and view all the answers

    Which one of the following is NOT a factor that affects the absorption of oral drugs?

    <p>Blood supply of the absorptive surface</p> Signup and view all the answers

    Lipophilic drugs can easily ___ the central nervous system.

    <p>Enter</p> Signup and view all the answers

    Which of the following is a competitive antagonist at muscarinic receptors?

    <p>Atropine</p> Signup and view all the answers

    What is the defining characteristic of an inverse agonist?

    <p>Reversed Efficacy (effect opposite to that of the true agonist)</p> Signup and view all the answers

    Which of the following is an agonist at muscarinic receptors?

    <p>Acetylcholine</p> Signup and view all the answers

    What is the key difference between an all/none response curve and a graded dose-response curve?

    <p>Both a and b</p> Signup and view all the answers

    Which statement about a lipophilic drug that is not highly bound to albumin is correct?

    <p>It is weakly basic if the pH of urine is less than its pKa</p> Signup and view all the answers

    In drug absorption, which method is the most common?

    <p>Passive diffusion</p> Signup and view all the answers

    Which statement describes first-order kinetics?

    <p>Described by an exponential equation for concentration-time relationship</p> Signup and view all the answers

    What does pharmacokinetics refer to?

    <p>Drug movement into, around, and out of the body</p> Signup and view all the answers

    Which enzyme is most important for drug metabolism?

    <p>CYT P 450 oxidase</p> Signup and view all the answers

    What does bioavailability of intravenously administered drugs depend on?

    <p>Less than 1</p> Signup and view all the answers

    Study Notes

    Pharmacology

    • Streptomycin inhibits binding of penicillin to bacterial cell wall.

    Mechanisms of Drug Action

    • The most common mechanism of drug action is a chemical mechanism.

    Pharmacogenetics and Adverse Drug Reactions

    • All or non-response curve is used to calculate potency.
    • Salbutamol tolerance in bronchial asthma is due to down regulation of beta-2 receptors.
    • Type B adverse drug reactions are pharmacogenetic effects.

    Receptors and Signaling

    • Corticosteroid receptors are cytoplasmic receptors that control transcription.
    • Drugs need to bind to receptors on the target cell to produce their actions.
    • The fastest signaling mechanism is the ion channel mechanism.

    Pharmacokinetics

    • The maximal effect of the drug occurs only when the drug binds to spare receptors.
    • Sublingual route of administration completely bypasses hepatic first-pass metabolism.
    • The best dose interval is half-life to avoid drug concentration fluctuations.
    • In zero-order kinetics, the graph of the drug concentration against time is a straight line.
    • Pharmacokinetics include absorption, elimination, and distribution, but not actions.
    • Half-life is the time after which plasma drug concentration is halved.

    Agonists and Antagonists

    • A full agonist is a drug that possesses both affinity and efficacy.
    • A systemic clearance is the sum of individual organ clearances.

    Metabolism and Excretion

    • The most famous site for first-pass metabolism is the liver.
    • The drug that is mostly eliminated by glomerular filtration is lithium.
    • Lipophilic drugs can enter the CNS easily.
    • Competitive antagonist at muscarinic receptors is atropine.

    Pharmacological Curves

    • The inverse agonist is a drug that possesses affinity and reversed efficacy.
    • All-or-none response curve differs from the graded curve in that it depicts the percentage of responders against the dose.
    • Efficacy of graded dose-response curve is obtained from Emax.

    Tolerance and Pharmacokinetic Interactions

    • Tolerance-unlike tachyphylaxis-to drugs may be due to counter-regulatory mechanisms.
    • Pharmacokinetic drug interactions may be due to enzyme induction.
    • Penicillin should not be mixed with aminoglycoside antibiotics in the same syringe because streptomycin inactivates penicillin.

    Absorption and Distribution

    • The most common method of drug absorption is passive diffusion.
    • In first-order kinetics, the concentration-time relationship is described by an exponential equation.
    • Pharmacokinetics is defined as the movement of drugs into, around, and out of the body.

    Enzymes and Metabolism

    • The most important enzyme for drug metabolism is CYT P450 oxidase.
    • Bioavailability of intravenous-administered drugs is equal to 1.
    • Excretion of drugs by filtration is affected by pH of urine and glomerular filtration rate.
    • Absorption of oral drugs is not affected by capillary permeability or blood supply of the absorptive surface.

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    Description

    Test your knowledge on pharmacokinetics with these quiz questions covering topics such as routes of administration, dose interval determination, and zero order kinetics. Choose the correct answers to enhance your understanding of drug metabolism in the body.

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