Introduction to Antimicrobials
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Questions and Answers

What is the primary function of antimicrobials?

  • To kill or suppress microorganisms (correct)
  • To relieve symptoms of infections
  • To promote bacterial growth
  • To enhance the immune response
  • Which type of drug resistance mechanism involves the alteration of drug-binding sites?

  • Compounds that antagonize drug actions
  • Active uptake cessation
  • Drug-metabolizing enzymes production
  • Alteration of target sites (correct)
  • Which of the following antibiotics is classified as a broad-spectrum penicillin?

  • Penicillin G
  • Ampicillin (correct)
  • Methicillin
  • Nafcillin
  • What does selective toxicity refer to in the context of antimicrobials?

    <p>The ability to affect only infecting microorganisms without harming the host (C)</p> Signup and view all the answers

    Which of the following is NOT a misuse of antimicrobials?

    <p>Treating confirmed bacterial infections (B)</p> Signup and view all the answers

    Which class of antibiotics inhibits bacterial cell wall synthesis?

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

    What is the primary mechanism of action for Penicillin G?

    <p>Weakening bacterial cell wall by binding to penicillin-binding proteins (B)</p> Signup and view all the answers

    Which drug combination acts as a beta-lactamase inhibitor?

    <p>Ampicillin + sulbactam (B)</p> Signup and view all the answers

    What is a key contraindication for the use of CI in patients?

    <p>Patients with renal disease (C)</p> Signup and view all the answers

    Which combination of medications is used to treat serious infections with gram-positive bacteria?

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

    What is one of the adverse effects of Sulfonamides?

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

    Which of the following types of bacteria are treated with Ciprofloxacin?

    <p>Aerobic gram-negative and gram-positive bacteria (A)</p> Signup and view all the answers

    What is a major concern regarding the use of Metronidazole?

    <p>Interactions with warfarin (C)</p> Signup and view all the answers

    Which adverse effect is associated with Fluoroquinolones?

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

    What is the mechanism of action of Daptomycin?

    <p>Causes loss of potassium from the cell membrane (D)</p> Signup and view all the answers

    What should be monitored in patients taking CI?

    <p>Signs of nephrotoxicity (A)</p> Signup and view all the answers

    What type of infections are predominantly treated by 1st generation cephalosporins?

    <p>Gram positive infections (C)</p> Signup and view all the answers

    Which of the following is an adverse effect associated with vancomycin?

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

    What is the mechanism of action for cephalosporins?

    <p>Inhibit cell wall synthesis (D)</p> Signup and view all the answers

    Which generation of cephalosporins is known for reaching the central nervous system (CSF) more easily?

    <p>4th Generation (B)</p> Signup and view all the answers

    What are aminoglycosides contraindicated from mixing with?

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

    Which type of antibiotic is effective against methicillin-resistant Staphylococcus aureus (MRSA)?

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

    The use of tetracyclines can lead to which of the following adverse effects?

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

    Which is a common drug interaction that must be avoided when using tetracyclines?

    <p>Antacids containing aluminum (B)</p> Signup and view all the answers

    Flashcards

    Antimicrobial

    A substance that kills or slows the growth of microorganisms.

    Selective Toxicity

    A drug's ability to harm a microorganism without harming the host.

    Antibiotic

    A chemical produced by a microorganism that can harm other microorganisms.

    Penicillin

    A type of antibiotic that inhibits bacterial cell wall synthesis.

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    Drug Resistance

    The ability of microorganisms to survive exposure to a drug.

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    Cell Wall Synthesis Inhibitors

    Antibiotics that block the formation of bacterial cell walls.

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    Narrow-spectrum antibiotic

    An antibiotic effective against a limited range of microorganisms.

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    Beta-lactamase

    An enzyme that breaks down some antibiotics like penicillin.

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    Cephalosporins: 1st Generation

    Effective against gram-positive bacteria like Streptococcus and Staphylococcus. Used for infections and surgical prophylaxis.

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    Cephalosporins: 2nd Generation

    Broader spectrum than 1st generation. Effective against gram-negative bacteria, certain gram-positive bacteria, and respiratory infections.

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    Cephalosporins: 3rd Generation

    Wide spectrum, effective against gram-negative bacteria and can reach the cerebrospinal fluid (CSF). Used for serious infections.

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    Cephalosporins: 4th Generation

    The strongest and most effective, easily reaching the CSF. Used for serious, resistant infections.

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    Carbapenems: Imipenem

    A powerful antibiotic often used in combination with cilastatin. Effective against a wide range of bacteria, including resistant ones.

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    Vancomycin

    A potent antibiotic used for serious gram-positive infections, including those resistant to other antibiotics.

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    Tetracyclines

    They work by suppressing bacterial growth by inhibiting protein synthesis. Used for a variety of infections, including acne and periodontal disease.

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    Tetracyclines: Side Effects

    They can cause gastrointestinal irritation, discoloration of teeth and bones, and photosensitivity.

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    Aminoglycoside MOA

    Aminoglycosides bind to the 30S ribosomal subunit, preventing protein synthesis in bacteria.

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    Aminoglycoside AE

    Aminoglycosides can cause ototoxicity (hearing loss) and nephrotoxicity (kidney damage).

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    Aminoglycoside CI

    Aminoglycosides are contraindicated in patients with renal disease, the elderly, and those with pre-existing hearing loss.

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    TMP/SMZ MOA

    Trimethoprim/Sulfamethoxazole (TMP/SMZ) inhibits bacterial synthesis of folic acid, a crucial nutrient for bacterial growth.

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    TMP/SMZ Uses

    TMP/SMZ is effective against various bacterial infections, including UTIs, ear infections, bronchitis, and pneumocystis pneumonia.

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    Ciprofloxacin MOA

    Ciprofloxacin inhibits bacterial DNA gyrase, an enzyme essential for DNA replication.

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    Ciprofloxacin Uses

    Ciprofloxacin is used for a wide range of infections, including those affecting the respiratory tract, GI tract, urinary tract, bones, skin, and joints.

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    Metronidazole MOA

    Metronidazole targets and damages the DNA of anaerobic bacteria and protozoa.

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    Study Notes

    Introduction to Antimicrobials

    • Antimicrobial agents kill or suppress microorganisms.
    • Antibiotics are chemicals produced by microorganisms with the ability to harm others.
    • Selective toxicity is a drug's ability to kill or suppress infecting microorganisms without harming the host.
    • Antimicrobials are used to treat infections and prophylactically (e.g., surgery, bacterial endocarditis, neutropenia).

    Misuses of Antimicrobials

    • Misuse includes attempting to treat untreatable infections, using the wrong dosage, using the wrong drug for a specific microorganism, or omitting proper cleaning procedures.

    Drug Resistance

    • Microorganisms can alter their function or structure, leading to changes in their DNA.
    • They can develop enzymes to metabolize drugs, stop taking up certain drugs, or alter binding sites, or produce compounds that counteract drug actions.

    Types of Antibiotics

    • Antibiotics are classified based on susceptible organisms (gram-positive or gram-negative, anaerobic or aerobic).
    • They are also categorized by narrow-spectrum or broad-spectrum activity.
    • Mechanisms of antimicrobial action include inhibiting cell wall synthesis (e.g. penicillins, cephalosporins, carbapenems, vancomycin), inhibiting protein synthesis (e.g. tetracyclines, macrolides), other mechanisms

    Inhibitors of Cell Wall Synthesis

    • Penicillins have a beta-lactam ring; some bacteria develop resistance by producing beta-lactamases. Subtypes include narrow and broad spectrum, penicillin-sensitive or penicillin-resistant types.
    • Cephalosporins are classified by generations (1st to 4th generation), with varying spectra of activity.
    • Carbapenems are broad-spectrum and are used in serious infections.
    • Vancomycin is used against specific resistant organisms.

    Inhibitors of Protein Synthesis

    • Tetracyclines are broad-spectrum inhibitors of protein synthesis.
    • Macrolides include erythromycin, azithromycin, and clarithromycin, and are bacteriostatic or bacteriocidal.

    Other Antimicrobials

    • Sulfonamides interfere with folic acid synthesis.

    • Fluoroquinolones inhibit DNA replication, including ciprofloxacin and levofloxacin.

    • Metronidazole causes DNA damage in anaerobic organisms and protozoal infections.

    • Daptomycin disrupts cell membranes, affecting Gram-positive bacteria, including drug-resistant strains.

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    Description

    Explore the world of antimicrobials, including their types, uses, and the critical concept of selective toxicity. Understand the potential misuses of these agents and the challenges posed by drug resistance. This quiz will test your knowledge on how antimicrobials impact the fight against infections.

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