Question 1

Compared to the average adult dose, the recommended dose of a drug for elderly a patients will likely be?

Accepted Answer

Elderly patients often have decreased renal function, which can lead to slower excretion of drugs. Therefore, the recommended dose is usually less than the average adult dose to prevent drug accumulation and toxicity.

Question 2

Which one of the following statements is applicable to absorption of drugs from the gastrointestinal tract?

Accepted Answer

The first-pass effect refers to the metabolism of a drug by the liver before it reaches systemic circulation, which can significantly reduce the bioavailability of certain drugs.

Question 3

A patient is treated chronically with a drug (A) metabolized by CYP 3A4. Recently he administer another drug (B) which is an enzymatic inducer of the CYP2D6. Which of the following is likely to occur?

Accepted Answer

Drug B induces CYP2D6, which does not affect the metabolism of drug A, as drug A is metabolized by CYP3A4. Therefore, there is no significant interaction affecting the pharmacokinetics of drug A.

Question 4

In general, biotransformation usually results in a product, which is more?

Accepted Answer

Biotransformation typically converts drugs into more water-soluble metabolites, facilitating their excretion from the body.

Question 5

Enzyme inhibitors such as Cimetidine and Erythromycin are likely to produce?

Accepted Answer

Enzyme inhibitors like Cimetidine and Erythromycin inhibit certain enzymes, such as those in the cytochrome P450 system, which are responsible for the breakdown of some drugs, leading to increased levels of these drugs in the body.

Question 6

What does "affinity" mean?

Accepted Answer

Affinity refers to the strength of the interaction between a drug and its receptor, indicating how tightly the drug binds to the receptor.

Question 7

Target proteins, which a drug molecule could bind, is/are ?

Accepted Answer

Target proteins for drug molecules include receptors, ion channels, carriers, and enzymes.

Question 8

An agonist is a substance that ?

Accepted Answer

An agonist is a substance that interacts with the receptor and initiates changes in cell function, producing various effects.

Question 9

A competitive antagonist is a substance that ?

Accepted Answer

A competitive antagonist binds to the same receptor site as the agonist, preventing the agonist from binding and thus progressively inhibiting its response.

Question 10

Tick the second messenger of G-protein-coupled (metabotropic) receptor ?

Accepted Answer

cAMP (cyclic Adenosine Monophosphate) is a second messenger used in signal transduction pathways of G-protein-coupled receptors.

Question 11

What is the type Of drug-to-drug interaction, which is connected, with processes of

Accepted Answer

Pharmacokinetic interactions involve changes in the absorption, distribution, metabolism, or excretion of a drug due to the presence of another drug.

Question 12

The term "chemical antagonism" means that?

Accepted Answer

Chemical antagonism occurs when two drugs interact to form an inactive compound, thereby reducing the effect of one or both drugs.

Question 13

Idiosyncratic reaction of a drug is?

Accepted Answer

Idiosyncratic reactions are unpredictable and inherent, representing qualitatively abnormal responses to a drug that are not related to the drug's pharmacological action.

Question 14

Therapeutic index (TI) is?

Accepted Answer

The therapeutic index (TI) is a ratio that compares the toxic dose of a drug to its therapeutic dose, used to evaluate the safety and usefulness of a drug for a particular indication.

Question 15

What does the term "bioavailability" mean?

Accepted Answer

Bioavailability refers to the fraction of an administered drug that reaches the systemic circulation in an unchanged form, regardless of the route of administration.

Question 16

Drug distribution: Most of drugs are distributed homogeneously?

Accepted Answer

Drugs are not distributed homogeneously; their distribution depends on factors like blood flow, tissue permeability, and binding to proteins, leading to varying concentrations in different tissues.

Question 17

A characteristic of drugs eliminated by zero order kinetic processes is that the half-life is not constant?

Accepted Answer

In zero-order kinetics, the rate of drug elimination is constant and does not depend on the drug concentration, leading to a non-constant half-life.

Question 18

The volume of distribution of gentamicin, a highly polar watersoluble drug, is 14L
Per 70 kg. This reflects the distribution of gentamicin into?

Accepted Answer

Gentamicin's volume of distribution of 14L per 70 kg indicates it distributes into plasma and interstitial fluid, which together make up the extracellular fluid compartment.

Question 19

For continuous intravenous infusion as method of administration the time needed to achieve the concentration of steady state depends on the rate of drug administration?

Accepted Answer

The time needed to achieve the concentration of steady state depends on the rate of drug administration because the rate of drug administration determines the rate at which the drug is entering the body and the rate at which it is being eliminated. If the rate of drug administration is high, the concentration of drug in the body will increase more quickly and the steady state concentration will be reached sooner. If the rate of drug administration is low, the concentration of drug in the body will increase more slowly and the steady state concentration will take longer to reach.

Question 20

For drugs that have first order kinetics, after 4 half-lives about drug will be eliminated?

Accepted Answer

In first-order kinetics, approximately 93.75% of a drug is eliminated after 4 half-lives.

Quiz 1: Understanding Pharmacokinetics and Drug Administration