Macrolides · Pharmacology

Which statement best describes the post-antibiotic effect of macrolides?

  1. They show no post-antibiotic effect against most pathogens
  2. They show a marked post-antibiotic effect on Gram-positive cocci
  3. They show a post-antibiotic effect only with added penicillin
  4. They show a post-antibiotic effect only under anaerobic conditions
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Correct answer: They show a marked post-antibiotic effect on Gram-positive cocci

Macrolides exhibit a persistent post-antibiotic effect, where bacterial growth remains suppressed even after the drug concentration falls below the MIC. This supports less frequent dosing intervals for these agents.

Difficulty: Medium Question 18 of 20

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