Which one of the following antibiotics chelates with calcium ?
Correct answer: B. Tetracycline
- A. pencillin
- B. Tetracycline
- C. Cephalosporins
- D. Erythromycin
Explanation
Tetracyclines bind calcium and other polyvalent cations to form poorly absorbed chelates, so milk and calcium-containing antacids reduce their absorption. Penicillins, cephalosporins and erythromycin do not show this characteristic interaction.
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