Macrolides · Pharmacology

Ketolides, such as Telithromycin, were developed specifically to overcome which issue?

  1. Poor oral bioavailability of Erythromycin
  2. Resistance caused by ribosomal methylation (erm)
  3. The short half-life of Clarithromycin
  4. High incidence of QT prolongation
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Correct answer: Resistance caused by ribosomal methylation (erm)

Telithromycin is a semi-synthetic derivative of erythromycin that binds to two sites on the bacterial ribosome. This dual binding allows it to remain effective against many strains of S. pneumoniae that are resistant to traditional macrolides.

Difficulty: Medium Question 12 of 20

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