Antibiotic Tigecycline: Overview and Contraindications
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Questions and Answers

Which bacterial resistance mechanisms does Tigecycline overcome in relation to tetracyclines?

  • RNA transcription and gene expression
  • Efflux pump acquisition and ribosomal protection (correct)
  • Cell wall synthesis and DNA replication
  • Membrane permeability and cell division

How does Tigecycline act on bacteria to inhibit protein synthesis?

  • By inhibiting DNA replication
  • By disrupting cell wall synthesis
  • By interfering with RNA transcription
  • By binding to the 30S ribosomal subunit and blocking entry of Aminoacyl-tRNA (correct)

Which type of bacteria is Tigecycline effective against?

  • Only Gram-negative bacteria
  • Only Gram-positive bacteria
  • Gram-positive, Gram-negative, and anaerobes (correct)
  • Only Pseudomonas spp.

What is the primary reason for not prescribing tetracyclines to children under 8 years of age?

<p>Risk of permanent discoloration of teeth during tooth development (B)</p> Signup and view all the answers

What class of antibiotics does Tigecycline belong to?

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

Which antibiotic acts by inhibiting protein synthesis through forming a stable complex with elongation factor EF-G?

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

What is the mechanism of action of tetracyclines?

<p>Reversibly binding to the 30S subunit of the ribosome at the A-site (D)</p> Signup and view all the answers

Which antibiotic has a broad spectrum that covers atypical bacteria such as Mycoplasma and Chlamydia?

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

What is a common side effect associated with tetracyclines?

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

Which antibiotic is less susceptible to inactivating enzymes due to its chemical structure?

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

Which antibiotic is used topically only and is not active against Pseudomonas aeruginosa?

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

Which antibiotic is effective against MRSA?

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

Why should patients receiving tetracyclines be kept out of heavy sunlight?

<p>To prevent photosensitivity reactions (A)</p> Signup and view all the answers

Which tetracycline is excreted primarily in the intestinal tract?

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

What is the main reason for the yellow discoloration of teeth associated with tetracycline use?

<p>Affinity for calcium leading to teeth deposits (C)</p> Signup and view all the answers

In what body fluids do tetracyclines reach high concentrations?

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

Which substance decreases the absorption of tetracyclines?

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

What impact do tetracyclines have on normal flora in the body?

<p>Cause superinfections by modifying normal flora (C)</p> Signup and view all the answers

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