Pharmacokinetics- Distribution MBBS AP DR TEE YEE SIM Quiz
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Questions and Answers

Which type of drug will have a low volume of distribution due to being highly plasma protein bound?

  • Insulin (correct)
  • Thiopentone
  • Ethanol
  • Paracetamol
  • When a drug's volume of distribution is very high, exceeding the actual body volume, where is the drug widely distributed?

  • In muscle tissue
  • In the brain
  • In adipose tissue (correct)
  • In the renal system
  • Which drug is retained in the vascular compartment due to its low volume of distribution?

  • Heparin (correct)
  • Warfarin
  • Thiopentone
  • Ethanol
  • Drugs with volume of distribution greater than 46 L are mainly restricted to which fluid compartment in the body?

    <p>Extracellular fluid</p> Signup and view all the answers

    What allows Thiopentone to produce anesthesia rapidly after administration?

    <p>High lipid solubility</p> Signup and view all the answers

    The redistribution of Thiopentone from plasma to other less perfused organs is mainly facilitated by?

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

    What does drug distribution refer to?

    <p>The reversible transfer of drugs between body-fluid compartments</p> Signup and view all the answers

    Which factor does NOT affect drug distribution?

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

    What is the main function of the blood-brain barrier?

    <p>To protect the brain tissue from toxic substances in the blood</p> Signup and view all the answers

    Which factor increases the permeability of the blood-brain barrier?

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

    Which characteristic of a drug allows it to rapidly cross the blood-brain barrier?

    <p>Lipid solubility in its unionized form</p> Signup and view all the answers

    What are the physiological barriers to drug distribution mentioned in the text?

    <p>BBB and placental barrier</p> Signup and view all the answers

    What type of drugs can pass through the Blood-CSF barrier?

    <p>Unionized lipid soluble drugs</p> Signup and view all the answers

    Why is it clinically advantageous to inject penicillin intrathecally for the treatment of brain abscess?

    <p>To increase penicillin concentration in the brain</p> Signup and view all the answers

    How do acidic drugs primarily bind to plasma proteins?

    <p>With plasma albumin</p> Signup and view all the answers

    What is the main mechanism of transfer across the placental barrier for lipid-soluble drugs?

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

    What can displacement reactions between drugs lead to?

    <p>Increase in toxicity</p> Signup and view all the answers

    In which conditions would free forms of drugs increase due to decreased albumin levels?

    <p>Renal failure</p> Signup and view all the answers

    What happens when a drug remains in the muscle and fat for a longer period?

    <p>Causes adverse effects like drowsiness</p> Signup and view all the answers

    Why are highly plasma protein bound drugs likely to have low volume of distribution?

    <p>They stay bound in the bloodstream</p> Signup and view all the answers

    What is the effect of alkalinization of urine in acidic drug poisoning?

    <p>Reduces drug elimination</p> Signup and view all the answers

    Which factor affects drug absorption by influencing the lipid solubility of a drug?

    <p>Particle size</p> Signup and view all the answers

    How does milk affect the absorption of tetracyclines?

    <p>Decreases absorption</p> Signup and view all the answers

    Which type of drug reactions involve drug displacement with examples?

    <p>Plasma protein binding reactions</p> Signup and view all the answers

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