Pharmacology Basics
50 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary goal of drug therapy?

  • To use the most potent drug available
  • To provide maximum benefit with minimal harm (correct)
  • To eliminate all disease without adverse reactions
  • To achieve a cure irrespective of side effects
  • Which property is considered the most important for an ideal drug?

  • Safety
  • Selectivity
  • Reversible action
  • Effectiveness (correct)
  • Why is the concept of 'no safe drugs' important in pharmacology?

  • Because safety is secondary to effectiveness
  • Because all drugs have the potential to cause harm (correct)
  • Because drugs are never 100% effective
  • Because patients generally misuse drugs
  • Which of the following is considered an 'other' property, rather than part of the 'Big 3', of the ideal drug?

    <p>Ease of administration (B)</p> Signup and view all the answers

    What does the term 'pharmacology' fundamentally involve?

    <p>The study of the interactions of chemicals with living systems (D)</p> Signup and view all the answers

    According to the provided information, which of the following is classified as a Schedule I controlled substance?

    <p>The content does not specify a Schedule I controlled substance. (A)</p> Signup and view all the answers

    A medication with the suffix '-statin' is most likely used to treat which of the following?

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

    Approximately what percentage of medication doses administered in the United States are from over-the-counter (OTC) drugs?

    <p>60% (A)</p> Signup and view all the answers

    Which of the following best describes a Schedule III drug?

    <p>Potential for abuse less than Schedule I and II drugs, and may lead to moderate to low physical or high psychological dependence. (D)</p> Signup and view all the answers

    Which of the following best describes the action of p-glycoprotein?

    <p>It transports drugs out of cells, limiting their access. (C)</p> Signup and view all the answers

    According to the content, what is the primary mechanism by which most drugs cross cell membranes?

    <p>Through direct penetration of the lipid bilayer (B)</p> Signup and view all the answers

    What is a key factor in determining how quickly a drug will have an effect?

    <p>The rate of drug absorption (A)</p> Signup and view all the answers

    If a drug is described as 'lipophilic', what does this indicate about its properties?

    <p>It is lipid-soluble and able to easily penetrate membranes. (C)</p> Signup and view all the answers

    Which of the following correctly describes the term 'pharmacokinetics'?

    <p>The study of what the body does to a drug. (C)</p> Signup and view all the answers

    What is the role of the liver in the context of pharmacokinetics?

    <p>It metabolizes drugs and transports them into bile for elimination. (B)</p> Signup and view all the answers

    What is the function of the kidney in pharmacokinetics?

    <p>To excrete drugs by pumping them into the urine. (C)</p> Signup and view all the answers

    If a drug is given intravenously (IV), what does this administration route bypass?

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

    Which of the following best describes the meaning of 'pH partitioning' in drug absorption?

    <p>The movement of a drug across membranes due to differences in pH. (A)</p> Signup and view all the answers

    How does increased blood flow at the site of administration affect drug absorption?

    <p>Increases absorption rate (D)</p> Signup and view all the answers

    A patient is taking a medication with the suffix '-prazole', what is it most likely prescribed for?

    <p>Peptic ulcer disease (D)</p> Signup and view all the answers

    Which type of drug reaction is primarily determined by the degree of immune system sensitization, rather than the dosage of the drug?

    <p>Allergic reaction (B)</p> Signup and view all the answers

    A patient experiences an uncommon drug response due to a genetic predisposition. This is best described as which type of reaction?

    <p>Idiosyncratic effect (B)</p> Signup and view all the answers

    A patient abruptly stops taking a medication and experiences withdrawal symptoms. Which term best describes this scenario?

    <p>Physical dependence (B)</p> Signup and view all the answers

    A drug-induced disease that mimics a naturally occurring pathology is known as what type of disease?

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

    When two drugs with similar actions are combined, and their effects are additive, what kind of drug-drug interaction is this?

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

    If the combination of two drugs results in a greater effect than the sum of their individual effects, this is an example of:

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

    If one drug reduces the effect of another drug, this interaction is best described as:

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

    What term describes what the body does to a drug?

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

    What term describes what the drug does to the body?

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

    In which phase of drug development is the drug first released for general use, allowing for observations in a large population?

    <p>Phase IV (B)</p> Signup and view all the answers

    During which stages of new drug development are the therapeutic effects, dosage range, safety and effectiveness determined?

    <p>Phase II and III (B)</p> Signup and view all the answers

    The official name of a drug used on national board exams is known as the:

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

    A drug is classified by its mechanism of action (MOA). This is best described as the:

    <p>Pharmacologic classification (B)</p> Signup and view all the answers

    Drugs used to treat high blood pressure are grouped under which therapeutic classification?

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

    A drug that is classified as a selective serotonin reuptake inhibitor (SSRI) belongs to which drug classification?

    <p>Pharmacologic classification (B)</p> Signup and view all the answers

    A drug administered via which route will bypass the first-pass effect?

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

    Which of the following factors primarily affects the rate at which a drug is transported from the blood to the tissues?

    <p>Organ blood flow (C)</p> Signup and view all the answers

    Why is the blood-brain barrier significant in pharmacology?

    <p>It selectively allows lipid-soluble drugs to enter while restricting others. (C)</p> Signup and view all the answers

    What is the primary consequence of non-ionized drugs becoming ionized in the fetal compartment?

    <p>Trapping of the drug in the fetal compartment. (C)</p> Signup and view all the answers

    Why are drugs bound to plasma proteins like albumin considered inactive?

    <p>They cannot interact with receptors (D)</p> Signup and view all the answers

    What is the potential consequence of liver enzyme induction on drug metabolism?

    <p>Increased metabolism of the inducing drug and other drugs (A)</p> Signup and view all the answers

    Why are infants at particular risk for adverse drug effects related to metabolism?

    <p>Their liver enzymes are not yet fully active. (A)</p> Signup and view all the answers

    What is the first-pass effect?

    <p>The metabolism of a drug by the liver before it reaches systemic circulation. (A)</p> Signup and view all the answers

    How does decreased gastric acidity in the elderly affect drug absorption?

    <p>It decreases absorption of some drugs. (C)</p> Signup and view all the answers

    What is the effect of reduced blood flow to the GI tract in the elderly on the first-pass effect?

    <p>It leads to erratic drug absorption due to inconsistent blood flow. (C)</p> Signup and view all the answers

    What makes the capillaries in the brain unique in comparison to standard capillaries found elsewhere?

    <p>Presence of tight junctions that restrict drug passage (C)</p> Signup and view all the answers

    Why are poorly perfused areas like abscesses and solid tumors a challenge for drug therapy?

    <p>They have a limited blood supply, making it difficult for drugs to reach the site of action (D)</p> Signup and view all the answers

    What factor influences a drug's ability to cross the placenta?

    <p>The lipid solubility of the drug (B)</p> Signup and view all the answers

    What is the importance of the dynamic equilibrium between bound and unbound drug molecules?

    <p>Balances free drug with drug bound to transport molecules to maintain constant levels of active drug (D)</p> Signup and view all the answers

    What is the main consequence of competition between two drugs metabolized by the same system?

    <p>Unpredictable levels of active drug for both drugs because of potential saturation of metabolic enzymes (A)</p> Signup and view all the answers

    Flashcards

    Pharmacology

    The study of drugs and their interactions with living organisms.

    Therapeutics

    The use of drugs to diagnose, prevent, or treat disease, or to prevent pregnancy.

    Drug

    A chemical that can affect living processes.

    Effectiveness

    The most important property a drug can have, meaning the drug should produce the desired effect.

    Signup and view all the flashcards

    Selectivity

    The ideal drug should be as selective as possible, meaning it targets the intended site with minimal side effects on other organs.

    Signup and view all the flashcards

    Idiosyncratic Effect

    An uncommon reaction to a drug caused by a genetic predisposition, leading to an unexpected response. For example, prolonged paralysis after succinylcholine due to an acetylcholinesterase deficiency.

    Signup and view all the flashcards

    Physical Dependence

    Development of a physical dependence on a drug, like opioids, alcohol, or barbiturates, leading to withdrawal symptoms if discontinued abruptly.

    Signup and view all the flashcards

    Iatrogenic Disease

    A disease caused unintentionally by medical treatment, such as drug-induced Parkinson's-like symptoms from antipsychotic medication.

    Signup and view all the flashcards

    Drug Interaction: Addition

    When two drugs with similar actions combine to produce an effect equal to the sum of their individual effects (1 + 1 = 2). For example, a diuretic and a beta-blocker.

    Signup and view all the flashcards

    Drug Interaction: Synergism

    When two drugs interact to produce an effect greater than the sum of their individual effects (1 + 1 > 2). For example, Bactrim, a combination of two antibiotics.

    Signup and view all the flashcards

    Drug Interaction: Inhibition

    When the effect of one drug is lessened or canceled out by another drug (1 + 1 < 2). For example, naloxone reversing the effects of morphine.

    Signup and view all the flashcards

    Pharmacokinetics

    The study of how a drug is absorbed, distributed, metabolized, and eliminated by the body.

    Signup and view all the flashcards

    Pharmacodynamics

    The study of how drugs interact with the body's cells and tissues to produce an effect.

    Signup and view all the flashcards

    Drug Elimination

    The process by which the body eliminates a drug.

    Signup and view all the flashcards

    Drug Half-Life

    The time it takes for the concentration of a drug in the body to decrease by 50%.

    Signup and view all the flashcards

    Minimum Effective Concentration (MEC)

    The smallest dose of a drug that produces a therapeutic effect.

    Signup and view all the flashcards

    Maximum Safe Concentration (MSC)

    The highest concentration of a drug that can be tolerated without producing toxic effects.

    Signup and view all the flashcards

    Therapeutic Range

    The range of drug doses that produce therapeutic effects without causing unacceptable toxic effects.

    Signup and view all the flashcards

    Dosage

    The amount of drug that needs to be administered to produce a therapeutic effect.

    Signup and view all the flashcards

    Time to Peak

    The time it takes for a drug to reach its peak concentration in the blood.

    Signup and view all the flashcards

    What type of drug classification has high abuse potential but no accepted medical use?

    A Schedule I drug has a high potential for abuse and is not currently accepted for medical use in the United States.

    Signup and view all the flashcards

    What type of drug classification has high abuse potential but is used for treatment?

    A Schedule II drug has a high potential for abuse, but it is currently accepted for medical use in the United States.

    Signup and view all the flashcards

    What is pharmacokinetics?

    The term 'pharmacokinetics' describes how the body processes a drug. It encompasses absorption, distribution, metabolism, and excretion.

    Signup and view all the flashcards

    Define absorption in relation to pharmacokinetics.

    Absorption is the movement of a drug from its site of administration into the bloodstream.

    Signup and view all the flashcards

    Define distribution in pharmacokinetics.

    Distribution refers to the movement of a drug from the site of absorption to the site of action. This can be the bloodstream and tissues.

    Signup and view all the flashcards

    Define metabolism in pharmacokinetics.

    Metabolism is the breakdown of a drug by the body, usually in the liver.

    Signup and view all the flashcards

    Define excretion in pharmacokinetics.

    Excretion is the elimination of a drug from the body, mainly through the kidneys and urine.

    Signup and view all the flashcards

    How does the rate of absorption affect the drug's effects?

    The rate of absorption of a drug affects the speed at which its effects will begin.

    Signup and view all the flashcards

    How does the amount of absorption affect the drug's effects?

    The amount of a drug absorbed, along with other factors, influences the intensity of its effects.

    Signup and view all the flashcards

    How does the route of administration affect absorption?

    The way a drug is administered can affect its absorption.

    Signup and view all the flashcards

    How does lipid solubility affect absorption?

    A drug's lipid solubility affects its ability to cross cell membranes and reach its target.

    Signup and view all the flashcards

    What is P-glycoprotein and how does it affect drug distribution?

    P-glycoprotein is a transporter protein that pumps drugs out of cells, helping to limit their access to certain areas like the brain.

    Signup and view all the flashcards

    What is the rate of dissolution and how does it affect drug absorption?

    The rate of dissolution refers to how quickly a drug dissolves in a solution, which impacts absorption.

    Signup and view all the flashcards

    How does surface area affect drug absorption?

    The surface area of the site of administration can influence the rate of absorption. A larger surface area allows for faster absorption.

    Signup and view all the flashcards

    How does blood flow affect drug absorption?

    Blood flow to the site of administration influences absorption. Good blood flow allows for faster absorption.

    Signup and view all the flashcards

    Sublingual administration

    Drug administration route involving placing medication under the tongue.

    Signup and view all the flashcards

    Drug absorption

    The process of a drug moving from the site of administration to the bloodstream.

    Signup and view all the flashcards

    Intravenous (IV) administration

    Drug administration route involving injecting medication directly into a vein.

    Signup and view all the flashcards

    Drug distribution

    The movement of a drug from the bloodstream to its target site in the body.

    Signup and view all the flashcards

    Blood-brain barrier

    A barrier that limits the passage of drugs from the bloodstream to the brain.

    Signup and view all the flashcards

    Plasma protein binding

    A measure of how well a drug binds to plasma proteins in the blood.

    Signup and view all the flashcards

    Drug metabolism

    A process by which the body transforms drugs into inactive or more easily excretable forms.

    Signup and view all the flashcards

    First-pass effect

    Drugs that are converted to inactive forms by the liver before entering the systemic circulation.

    Signup and view all the flashcards

    Blood flow to tissues

    A factor that can affect drug distribution, affecting the rate of delivery to tissues.

    Signup and view all the flashcards

    Drug excretion

    The process by which drugs are eliminated from the body.

    Signup and view all the flashcards

    Drug induction or inhibition

    The ability of a drug to induce or inhibit its own metabolism, affecting the duration of action.

    Signup and view all the flashcards

    Drug absorption in the elderly

    Factors that could affect drug absorption in older adults.

    Signup and view all the flashcards

    Drug metabolism in the elderly

    Factors that could affect drug metabolism in older adults.

    Signup and view all the flashcards

    Drug excretion in the elderly

    Factors that could affect drug excretion in older adults.

    Signup and view all the flashcards

    Bound drug

    A state where a drug is bound to a carrier molecule but not exerting its pharmacological effect.

    Signup and view all the flashcards

    Study Notes

    Pharmacology Basics

    • Drug: Any chemical affecting living processes.
    • Pharmacology: Study of drugs and their interactions.
    • Clinical Pharmacology: Study of drugs in humans.
    • Therapeutics (Pharmacotherapeutics): Medical use of drugs to diagnose, prevent, or treat disease, including contraception.
    • Therapeutic Objective: Maximum benefit, minimum harm. Requires skill, judgment, knowledge, and a commitment to minimizing harm. Study, learn, and apply are critical.

    Properties of an Ideal Drug

    • Effectiveness: The most crucial property.
    • Safety: No drug is completely safe; all have side effects.
    • Selectivity: No drug is completely selective; all have side effects.

    Other Ideal Drug Properties

    • Reversible Action: Effects cease when the drug is discontinued.
    • Predictability: The drug's effects are consistent and known.
    • Ease of Administration: Convenient and simple method of intake.
    • Freedom from Drug Interactions: No interference with other drugs' effects.
    • Low Cost: Affordable for patients.
    • Chemical Stability: Maintains its intended action over time.
    • Simple Generic Names: Clear and unambiguous identifying names.

    Adverse Drug Reactions

    • Allergic Reactions: Immune response (Type I and IV Hypersensitivity). Determined by immune system sensitization, not dosage. Patient sensitivity can change over time. Few drugs cause severe allergic reactions. Penicillins are common culprits; others include sulfonamides, diuretics, antibiotics, and oral hypoglycemics.

    • Idiosyncratic Effect: Uncommon response due to genetic predisposition. Example: Succinylcholine-induced paralysis (acetylcholinesterase deficiency).

    • Paradoxical Effect: Opposite of intended response. Benzodiazepines for insomnia may cause excitement, especially in children and the elderly.

    • Physical Dependence: Body adapts to chronic drug use, leading to withdrawal symptoms (opioids, alcohol, barbiturates, amphetamines). Abrupt discontinuation is dangerous, requiring professional guidance.

    • Iatrogenic Disease: Disease caused by medical treatment (e.g., antipsychotic meds causing Parkinson's symptoms).

    Drug-Drug Interactions

    • Addition (Potentiation): Similar drugs have additive effects (1 + 1 = 2). Example: diuretic plus beta-blocker.
    • Synergism: Different drugs enhance each other's effects (1 + 1 > 2). Example: Bactrim (two antibiotics combined).
    • Inhibition: One drug reduces the effects of another (1 + 1 < 2). Example: Morphine plus naloxone.

    Drug-Drug Interactions (Kinetics)

    • Intensification of Effects/Increased Therapeutic/Adverse Effects: Example: Sulbactam and ampicillin (increased therapeutic). Aspirin and warfarin (increased adverse).
    • Reduction of Effects/Inhibitory/Reduced Therapeutic/Adverse Effects: Example: Propranolol and albuterol (reduced therapeutic). Naloxone for morphine overdose (reduced adverse).

    Factors Determining Drug Response Intensity

    • Administration Method
    • Pharmacokinetics: What the body does to the drug (absorption, distribution, metabolism, excretion).
    • Pharmacodynamics: What the drug does to the body.
    • Individual Variation: Responses vary from person to person.

    New Drug Development

    • Phase I: Evaluates drug metabolism, pharmacokinetics, and biologic effects.
    • Phase II and III: Determines therapeutic effects, dosage range, safety, and effectiveness.
    • Phase IV: New drug released for general use, allowing observation in a large population.

    Exercise Discretion Regarding New Drugs

    • Balance potential benefits against inherent risks.
    • New drugs generally present more risks initially. Consider pharmaceutical representatives' incentives.
    • Exercise caution and due diligence with new medications.

    Drug Naming

    • Chemical Formula: Complex chemical description. Example: 3,3-Dimethyl-7-oxo-6-(2-phenoxyacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2- carboxylic acid.
    • Chemical Name: More specific and descriptive; Example: Phenoxymethylpenicillin.
    • Generic Name: Official name; example penicillin V. (Used on national board exams).
    • Trade Name: Commercial name; Example: Propicillin®.

    Generic vs. Trade Names

    • Generic Names: More complicated, can be easily confusing.
    • Trade Names: Multiple trade names for one drug are common. Examples: Adalat CC®, Nifedical XL®, Nifediac CC®, Procardia®, Procardia XL® are all nifedipine (a calcium channel blocker).
    • United States drugs and drugs outside the United States may have different active ingredients. Products with the same generic name may have different active ingredients and bioavailability. Example: Kaopectate® (multiple forms).

    Drug Classification

    • Therapeutic Classification: Categorized by their intended treatments. Example: Drugs to lower plasma volume, high blood pressure, depression.
    • Pharmacologic Classification: Categorized by chemical structure/mechanism of action. Example: Diuretics, Calcium channel blockers, SSRIs.
    • Controlled Substances: Drugs with varying abuse potential (Schedules I-V).
    • Over-the-Counter (OTC) Medications: Example: Tylenol.
    • Homeopathic and Herbal Remedies: Example: pollen for hay fever, rosemary tea.

    Pharmacologic Classifications

    • Suffixes aid in identifying general drug classes. Example: Antibiotic -cillin(Amoxicillin, Amoxil) HMG-CoA reductase inhibitor -statin Simvastatin, Zocor; Proton pump inhibitor -prazole Omeprazole, Prilosec; Low-molecular-weight heparin -parin Enoxaparin, Lovenox; Benzodiazepines -epam, -olam (Diazepam Valium Alprasolam Xanax); Phosphodiesterase type 5 inhibitor -afil Sildenafil , Viagra

    Over-the-Counter (OTC) Drugs

    • Significant portion of consumer healthcare spending ($30 billion annually). 60% of all administered doses. 40% of Americans use at least one every two days. OTCs treat far more illnesses than physician visits.

    Pharmacokinetics (What the body does to the drug)

    • Absorption: Movement of drug into blood. Factors influencing absorption rate and amount.
    • Distribution: Movement of drug from site of absorption to site of action. Influencing factors include organ blood flow, protein binding, molecule size, and lipid solubility.
    • Metabolism (Biotransformation): Drug conversion into less active or more active forms. Liver plays a major role in drug metabolism.
    • Excretion: Removal of drug from the body; primarily via the kidneys.

    Absorption (Factors)

    • Rate of dissolution
    • Surface area
    • Blood flow
    • Lipid solubility
    • pH partitioning.

    Distribution (influence)

    • Organ blood flow
    • Plasma protein binding
    • Plasma protein binding (particularly to Albumin)
    • Molecule Size
    • Lipid solubility

    Metabolism/Biotransformation (influence)

    • Liver
    • Drug-metabolizing enzymes (including Cytochrome P450)

    Excretion (influences)

    • Kidneys
    • Bile.

    Factors Affecting Drug Response Intensity

    • Special Considerations for Elderly: Effects on absorption, metabolism, distribution, excretion.
    • Special Considerations for Infants: Limited drug metabolism.
    • Special Situations(Special Considerations): Blood-brain barrier, blood-placenta barrier, ion trapping, competition of multiple drugs for receptor sites, and poor blood flow to affected tissues.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Explore the fundamental concepts of pharmacology including drug definitions, interactions, and the essential properties of an ideal drug. Understand the therapeutic objectives and the balance between effectiveness and safety in drug administration. This quiz will help reinforce your knowledge in clinical pharmacology and therapeutics.

    More Like This

    Overview of Pharmacology
    78 questions
    Drug Interactions Quiz
    36 questions
    Use Quizgecko on...
    Browser
    Browser