Beta-Lactam Antibiotics · Pharmacology

What is the primary route of excretion for most beta-lactam antibiotics, requiring dose adjustment in renal failure?

  1. Biliary excretion into the intestine
  2. Hepatic metabolism by CYP enzymes
  3. Tubular secretion and glomerular filtration
  4. Exhalation of volatile metabolites via the lungs
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Correct answer: Tubular secretion and glomerular filtration

Most beta-lactams are eliminated unchanged by the kidneys. Inhibition of this process (e.g., by Probenecid) can increase the serum half-life and concentration of these drugs.

Difficulty: Medium Question 10 of 20

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