Pharmacokinetics and Pharmacodynamics

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Questions and Answers

Which of the following best describes the relationship between pharmacokinetics and pharmacodynamics?

  • Pharmacokinetics describes what the drug does to the body, while pharmacodynamics describes what the body does to the drug.
  • Pharmacokinetics studies the side effects of a drug, while pharmacodynamics studies its therapeutic effects.
  • Pharmacokinetics describes the movement of the drug through the body, while pharmacodynamics describes the drug's effects on the body. (correct)
  • Pharmacokinetics and pharmacodynamics are interchangeable terms describing drug-receptor interactions.

A drug's half-life is the time it takes for:

  • The drug to reach its maximum effect.
  • The drug's concentration in the plasma to decrease by half. (correct)
  • The drug to be completely eliminated from the body.
  • The drug to be completely absorbed into the bloodstream.

What is the most direct implication of a drug having a narrow therapeutic index?

  • The drug is effective for only a narrow range of diseases.
  • The drug is only effective when administered via a specific route.
  • Small differences in dose or blood concentration may lead to serious therapeutic failures or adverse drug reactions. (correct)
  • The drug is rapidly metabolized and requires frequent dosing.

Which route of drug administration generally leads to the most rapid onset of action?

<p>Intravenous (A)</p> Signup and view all the answers

In pharmacokinetics, what does 'bioavailability' refer to?

<p>The fraction of an administered dose of drug that reaches the systemic circulation unchanged. (C)</p> Signup and view all the answers

What is a 'prodrug'?

<p>An inactive form of a drug that is converted into its active form in the body. (C)</p> Signup and view all the answers

A patient with impaired renal function may require a lower dose of a drug primarily to prevent:

<p>Drug accumulation and toxicity. (B)</p> Signup and view all the answers

Which of the following is an example of a pharmacodynamic drug interaction?

<p>Two drugs bind to the same receptor site, producing an additive effect. (A)</p> Signup and view all the answers

Genetic polymorphisms affecting drug-metabolizing enzymes (e.g., CYP450 enzymes) can lead to:

<p>Variations in drug responses among individuals. (B)</p> Signup and view all the answers

What is the impact of plasma protein binding on drug distribution?

<p>Decreases the volume of distribution, limiting the drug's access to tissues. (B)</p> Signup and view all the answers

Flashcards

Pharmacokinetics

The study of what the body does to a drug, including absorption, distribution, metabolism, and excretion (ADME).

Pharmacodynamics

The study of what a drug does to the body, involving receptor binding, signal transduction, and physiological effects.

Clinical Reasoning

Process of using clinical knowledge and patient information to make informed decisions about treatment.

Individualizing Treatment

Adjusting a drug regimen to achieve the best possible outcome for a specific patient.

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Monitoring Treatment

The process of observing and checking the effects of a drug over time.

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Absorption, Distribution, Metabolism, Excretion

Properties of a drug which determine its movement and modification in the body.

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Bioavailability

How effectively a drug reaches the circulation after administration.

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Metabolism

The process by which a drug is chemically changed in the body.

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Study Notes

  • Pharmacology involves pharmacokinetics and pharmacodynamics.
  • Pharmacokinetics studies drug movement into, through, and out of the body.
  • Pharmacodynamics studies the biochemical and physiological effects of drugs on the body, including the mechanisms of drug action and the relationship between drug concentration and effect.
  • Clinical reasoning skills are needed to select, monitor, and individualize drug therapy.
  • Selection, monitoring, and individualization of treatment are impacted by various factors relating to pharmacokinetics and pharmacodynamics.

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