Drug Absorption Kinetics
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Questions and Answers

Which form of a drug crosses membranes?

  • Polymerized form
  • Non-ionized form (correct)
  • Hydrogenated form
  • Ionized form
  • What is the effect of pH on drug absorption?

  • It determines whether the drug is ionized or non-ionized (correct)
  • It only affects water solubility
  • It influences the vascularity of the drug
  • It changes the surface area available for absorption
  • In what equilibrium do weak acids or weak bases exist?

  • Non-ionized or unionized forms (correct)
  • Non-polar forms
  • Only ionized forms
  • Fully charged forms
  • Which form of a drug is better renally excreted?

    <p>Ionized form</p> Signup and view all the answers

    What happens to ionized forms of drugs in the filtrate?

    <p>They are trapped and not excreted</p> Signup and view all the answers

    Why is lactulose useful in hepatic encephalopathy?

    <p>It causes ammonia to become ammonium</p> Signup and view all the answers

    What term is used to describe the action of the body on drugs?

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

    Which factor primarily determines the route(s) of drug administration?

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

    What is the main characteristic of a drug according to the text?

    <p>Biological function changes</p> Signup and view all the answers

    What does Vol. of distribution refer to in pharmacokinetics?

    <p>The extent of drug distribution in the body</p> Signup and view all the answers

    Which process involves the breakdown of drugs into metabolites?

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

    What is the purpose of understanding pharmacokinetics in medication administration?

    <p>Ensuring safe and accurate use of medications</p> Signup and view all the answers

    What is the main factor affecting the calculation of apparent volume of distribution (Vd)?

    <p>Percentage of drug bound to plasma proteins</p> Signup and view all the answers

    How does a high Vd value compare to a low Vd value?

    <p>High Vd indicates extensive tissue sequestration</p> Signup and view all the answers

    What is the significance of knowing the apparent volume of distribution (Vd) in the clinical setting?

    <p>Calculating the loading dose of a drug</p> Signup and view all the answers

    Which barrier limits the passage of only lipid-soluble drugs or those transported by facilitated diffusion to reach the brain?

    <p>Blood-brain barrier</p> Signup and view all the answers

    What factor influences the duration of action of CNS drugs more than the half-life after an initial dose?

    <p>Redistribution rate into fat tissues</p> Signup and view all the answers

    How does the blood/fat ratio influence the rate of redistribution and duration of action for a second dose of a drug?

    <p>Lower blood/fat ratio results in slower redistribution</p> Signup and view all the answers

    What is the process of distribution of a drug from the systemic circulation to organs and tissue?

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

    Which factor may increase the 'free fraction' of a drug in the body, potentially enhancing its effects?

    <p>Decreased plasma protein binding</p> Signup and view all the answers

    What is the term for the equilibrium between bound and free drug molecules in plasma?

    <p>Drug-Protein Complex</p> Signup and view all the answers

    Which type of drugs are prone to drug interactions due to their high plasma protein binding and narrow therapeutic range?

    <p>Drugs with high plasma protein binding and narrow therapeutic range</p> Signup and view all the answers

    What is the area under the curve (AUC) that represents the horizontally striped area known as?

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

    With oral drug administration, where do drugs get absorbed initially?

    <p>Into the portal circulation</p> Signup and view all the answers

    What type of reaction involves the addition of a water molecule with subsequent bond breakage?

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

    Which genetic polymorphism is associated with local anesthetics and succinylcholine?

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

    Monoamine oxidases are involved in the metabolism of which neurotransmitters?

    <p>Dopamine and serotonin</p> Signup and view all the answers

    Alcohols are metabolized to aldehydes and then to acids by which enzymes?

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

    Which phase of biotransformation involves conjugation with endogenous compounds?

    <p>Phase II</p> Signup and view all the answers

    Depletion of which compound in the liver is associated with acetaminophen hepatotoxicity?

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

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