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NBME 18 Answers

nbme18/Block 2/Question#21

66 yo woman, 2 days of fever, flank pain, pain with urination, nausea

Calcium carbonate

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divalent cations interfere with the absorption (adsorbtion?) of Ciprofloxacin.

redvelvet  divalent cations interfere with the absorption of tetracyclines, not fluoroquinolones. anti-acids interfere with the absorption of fluoroquinolones. (like in this q, it's ca carbonate) +  
keyseph  According to SketchyPharm, divalent cations also interfere with the absorption of fluoroquinolones +  




Calcium Carbonate is an antacid which can chelate and decrease effectiveness of other drugs such as tetracyclines and fluroquinolones