Drug-Receptor Concepts in Pharmacology Lecture Quiz
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Questions and Answers

What initiates the two processes of drug action on the body and the body on the drug?

  • Pharmacology
  • Headache
  • Drug taking (correct)
  • Aspirin

    • Which term is used to describe the disappearance of a headache within 15 to 30 minutes after taking aspirin?

  • Pharmacokinetics
  • Partial agonist
  • Pharmacodynamics (correct)
  • Agonist

    • What type of drug target or receptor is defined as a molecule that can bind to a drug?

  • Agonist (correct)
  • Pharmacology
  • Partial agonist
  • Antagonist

    • Which term is used to describe a drug that may prevent the biological effect of another drug?

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

    What is the main focus of Pharmacology?

    <p>The study of drug-body interaction</p> Signup and view all the answers

    Which branch of Pharmacology involves the study of drug effects?

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

    What is the study of how the body deals with drugs called?

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

    How do non-specific drugs act?

    <p>They lack any specific structure-activity relationship</p> Signup and view all the answers

    What are drug receptors primarily made of?

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

    Where are drug receptors located?

    <p>On the cell membrane or inside the cell</p> Signup and view all the answers

    What determines the selectivity of drug-receptor interactions?

    <p>Both chemical and biological or tissue selectivity</p> Signup and view all the answers

    What does the drug concentration-effect relationship follow?

    <p>$\log(x)$ curve</p> Signup and view all the answers

    What fraction of receptors occupied by the drug leads to maximum drug effect?

    <p>All receptors occupied</p> Signup and view all the answers

    What type of drugs interact with specific macromolecular or cellular targets in the body called receptors?

    <p>Specific drugs</p> Signup and view all the answers

    How do specific drugs interact with biological systems?

    <p>By showing clear-cut structure-activity relationship and producing biological effects at very low doses</p> Signup and view all the answers

    What type of molecules are drug receptors mainly composed of?

    <p>Proteins or glycoproteins</p> Signup and view all the answers

    In reversible competitive antagonism, what determines the fraction of receptors occupied by the agonist and antagonist drugs?

    <p>Relative receptor affinities and concentrations</p> Signup and view all the answers

    What type of drug antagonism occurs when the antagonist drug does not compete with the agonist drug for the same receptor binding site?

    <p>Non-competitive antagonism</p> Signup and view all the answers

    What type of drug antagonism occurs when two drugs elicit opposing responses, cancelling out each other's effects, and act on different receptors?

    <p>Physiological antagonism</p> Signup and view all the answers

    In irreversible competitive antagonism, what happens when the antagonist drug binds irreversibly to the receptor?

    <p>Receptor becomes inactive</p> Signup and view all the answers

    What type of drug antagonism results from a direct interaction between the antagonist and agonist drugs, rendering the agonist drug inactive or unavailable to interact with its target receptors?

    <p>Chemical antagonism</p> Signup and view all the answers

    What type of drug antagonism occurs when the antagonist drug reduces the effective concentration of the active drug at its site of action?

    <p>Pharmacokinetic antagonism</p> Signup and view all the answers

    What does summation or additivity refer to in relation to the combined effect of two drugs?

    <p>Combined effect being greater than the algebraic sum of their individual effects</p> Signup and view all the answers

    What term is used to describe the conjoint effect of two drugs being greater than the algebraic sum of their individual effects?

    <p>Synergism or potentiation</p> Signup and view all the answers

    What type of drug antagonism occurs when both the agonist and antagonist drugs compete for the same receptor binding site?

    <p>Competitive antagonism</p> Signup and view all the answers

    What type of drug antagonism occurs when an antagonist drug does not compete with an agonist drug for the same receptor binding site but may bind to a different site on the receptor or interfere with response coupling?

    <p>Non-competitive antagonism</p> Signup and view all the answers

    What type of drug antagonism results from a direct interaction between an antagonist and an agonist drug, rendering the agonist drug inactive or unavailable to interact with its target receptors?

    <p>Chemical antagonism</p> Signup and view all the answers

    What is the term used to describe an acquired state of progressively decreasing responsiveness to a drug as a result of prior or repeated exposure to the drug or another drug with a similar action?

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

    What are the possible consequences of variation in drug responsiveness?

    <p>Decreased efficacy and increased side effects</p> Signup and view all the answers

    What type of variation refers to an innate vs acquired state of progressively decreasing responsiveness to a drug?

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

    Which mechanism involves the reduction in receptor density, leading to acquired tolerance to a drug?

    <p>Receptor down-regulation</p> Signup and view all the answers

    Which term best describes the exhaustion or depletion of endogenous stores of mediators of a drug's action?

    <p>Physiological adaptation</p> Signup and view all the answers

    What type of drug antagonism occurs when two drugs elicit opposing responses, cancelling out each other's effects, and act on different receptors?

    <p>Pharmacodynamic antagonism</p> Signup and view all the answers

    What determines the selectivity of drug-receptor interactions?

    <p>Therapeutic index</p> Signup and view all the answers

    What is the main focus of Pharmacology?

    <p>Drug action and effect</p> Signup and view all the answers

    How is the therapeutic index determined?

    <p>By the ratio of toxic to therapeutic dose</p> Signup and view all the answers

    What does physiological adaptation in drug receptor concepts refer to?

    <p>Exhaustion or depletion of mediators common with indirectly-acting drugs due to depletion of endogenous stores of mediators of the drug’s action</p> Signup and view all the answers

    What type of drug antagonism occurs when an antagonist drug reduces the effective concentration of the active drug at its site of action?

    <p>Chemical antagonism</p> Signup and view all the answers

    Where are drug receptors primarily located?

    <p>On cell membranes</p> Signup and view all the answers

    Study Notes

    • Pharmacology is the study of drug-body interaction, including the action of drugs on the body and the body's response to drugs.

    • Pharmacology has three main branches: Pharmacodynamics (study of drug effects), Pharmacokinetics (study of how the body deals with drugs), and Pharmacotherapeutics (study of drug use in disease treatment).

    • Drugs interact with biological systems in two ways: non-specific and specific.

    • Non-specific drugs act in a simple physical or chemical manner, such as antacids, and lack any specific structure-activity relationship.

    • Specific drugs interact with specific macromolecular or cellular targets in the body called receptors, showing clear-cut structure-activity relationship and producing biological effects at very low doses.

    • Drug receptors are protein or glycoprotein molecules, located on the cell membrane or inside the cell.

    • There are different types of drug targets or receptors, including classical receptors, ion channels, enzymes, and carrier or transport proteins.

    • Drug-receptor interactions occur when the drug's molecular structure and shape are similar to those of natural chemical messengers, leading to a complementary fit between the drug molecule and the receptor binding site.

    • The drug-receptor interaction forms a reversible drug-receptor complex through a "lock and key" relationship, with selectivity determined by both chemical and biological or tissue selectivity.

    • The fraction of receptors occupied by the drug depends on the drug concentration and the equilibrium dissociation constant (KD) for the drug-receptor complex.

    • The drug effect is proportional to the fraction of receptors occupied, with maximum drug effect occurring when all receptors are occupied.

    • The drug concentration-effect relationship follows a sigmoidal curve, with drug concentration on the log scale plotted against effect.

    • Drug-Drug Interactions is a topic covered in MPharm PHA112 Drug Receptor Concepts during Week 12.

    • Drug antagonism is a type of Drug-Drug Interaction where the effect of one drug is diminished or abolished in the presence of another.

    • There are different types of drug antagonism: competitive, non-competitive, chemical, pharmacokinetic, and physiological or functional.

    • In competitive antagonism, both the agonist and antagonist drugs compete for the same receptor binding site.

    • Reversible competitive antagonism occurs when both drugs bind reversibly to the receptor, and the fraction of receptors occupied depends on their relative receptor affinities and concentrations.

    • Irreversible competitive antagonism occurs when the antagonist drug binds irreversibly to the receptor, rendering a fraction of receptors permanently unavailable for agonist drug binding.

    • Non-competitive antagonism occurs when the antagonist drug does not compete with the agonist drug for the same receptor binding site but may bind to a different site on the receptor or interfere with response coupling.

    • Chemical antagonism results from a direct interaction between the antagonist and agonist drugs, rendering the agonist drug inactive or unavailable to interact with its target receptors.

    • Pharmacokinetic antagonism occurs when the antagonist drug reduces the effective concentration of the active drug at its site of action, possible mechanisms include reduced absorption, increased metabolic degradation, or increased renal excretion.

    • Physiological or functional antagonism occurs when two drugs elicit opposing responses, cancelling out each other's effects, and acting on different receptors.

    • Summation or additivity refers to the combined effect of two drugs being equal to the algebraic sum of their individual effects when they elicit the same overt response, regardless of their mechanism of action.

    • Synergism or potentiation refers to the conjoint effect of two drugs being greater than the algebraic sum of their individual effects, the synergist may act to increase the concentration of the other drug at its receptor sites.

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    Description

    Test your knowledge of drug-receptor concepts in pharmacology with this quiz. Covering topics such as drug-receptor interactions, variation in drug responsiveness, and clinical selectivity, this quiz will help reinforce your understanding of essential concepts in pharmacology.

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