Pharmacology: Drug Biotransformation and Metabolism
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Questions and Answers

What is the main mechanism of drug elimination through biotransformation?

  • Phase II reactions
  • Either phase I or phase II reactions (correct)
  • Phase I reactions
  • Liver microsomal enzyme systems

Where are the specific enzyme systems that catalyze metabolism located?

  • Brain
  • Lungs
  • Kidneys
  • Liver (correct)

What is the effect of biotransformation on the pharmacologic action of the parent drug?

  • It terminates the action (correct)
  • It has no effect
  • It intensifies the action
  • It increases the action

What is the term for the process where a more toxic metabolite is produced?

<p>Lethal synthesis (B)</p> Signup and view all the answers

What is the term for a drug that is biotransformed into a pharmacologically active metabolite?

<p>Prodrug (C)</p> Signup and view all the answers

What is the effect of biotransformation on the biological half-life of a drug?

<p>It decreases the half-life (D)</p> Signup and view all the answers

What is the reason for the increased incidence of toxicity with propranolol and lignocaine in elderly?

<p>Decreased hepatic metabolism (C)</p> Signup and view all the answers

What is the term for the study of genetically determined variation in drug response?

<p>Pharmacogenetics (D)</p> Signup and view all the answers

What is the result of chronic diseases of liver on hepatic metabolism of some drugs?

<p>Decreased metabolism (C)</p> Signup and view all the answers

Why do neonates conjugate chloramphenicol more slowly?

<p>Due to decreased activity of hepatic microsomal enzymes (A)</p> Signup and view all the answers

What is the characteristic of fast acetylators of isoniazid?

<p>Hepatotoxicity and require larger dose of the drug (D)</p> Signup and view all the answers

What is the result of atypical pseudocholinesterase metabolizing succinylcholine?

<p>Prolonged apnea due to paralysis of respiratory muscles (B)</p> Signup and view all the answers

What is the effect of poor nutrition on enzyme function?

<p>Decrease enzyme function (B)</p> Signup and view all the answers

What is the importance of G6PD activity in RBCs?

<p>To maintain the integrity of RBCs (A)</p> Signup and view all the answers

What is the effect of simultaneous administration of drugs on drug metabolism?

<p>Can result in increased or decreased metabolism (D)</p> Signup and view all the answers

Where are the drug-metabolizing enzyme systems localized?

<p>In the liver microsomes (D)</p> Signup and view all the answers

What is the effect of enzyme induction and enzyme inhibition on drug interactions?

<p>They represent the major sites of drug interactions (D)</p> Signup and view all the answers

What type of factors play an important role in regulating the activity of drug-metabolizing enzyme systems?

<p>Environmental factors (D)</p> Signup and view all the answers

What is a known factor that stimulates the activity of drug-metabolizing enzymes in the liver microsomes?

<p>Hormonal changes in the body (A)</p> Signup and view all the answers

What is the purpose of pretreating the second mouse with phenobarbitone in Experiment 1?

<p>To induce the enzyme responsible for thiopental biotransformation (B)</p> Signup and view all the answers

What is the effect of starvation on the biotransformation of thiopental?

<p>It inhibits the biotransformation (C)</p> Signup and view all the answers

What is the outcome of pretreating the mouse with an enzyme inducer such as phenobarbitone?

<p>It decreases the duration of action of thiopental (A)</p> Signup and view all the answers

What is the dose of thiopental administered to the mice in Experiment 1?

<p>100 mg/kg (D)</p> Signup and view all the answers

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