NBME 18 Calcium carbonate (NBME Answers)

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Retired NBME 18 Answers

nbme18/Block 2/Question#21 (reveal difficulty score)
66 yo woman, 2 days of fever, flank pain, ...
Calcium carbonate 🔍 / 📺 / 🌳 / 📖
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submitted by ∗krewfoo99(115)

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

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submitted by madmoroccan(3)

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

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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) +3

keyseph According to SketchyPharm, divalent cations also interfere with the absorption of fluoroquinolones +14

nbmeanswersownersucks Calcium carbonate is an antacid but it has Calcium in it....which is a divalent cation +4

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submitted by ∗an1(114)

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Common Chelators:

Iron
Calcium
Mg
Aluminium

Commonly Chelated Drugs:

Tetracyclines
Fluoroquinolones
Levothyroxine

These create insoluble complexes and are inhibited from being absorbed!

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an1 ^Best way to avoid is to take meds at different times in the day +

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