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Retired NBME Free 120 Answers

free120/Block 2/Question#10 (reveal difficulty score)
A 29-year-old woman is prescribed ...
Metabolism ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—bwdc(697)
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Carbamazepine is a notorious CYP450 inducer, so you should be guessing metabolism no matter what. CYP450 plays an important role in both vitamin D bioactivation and degradation in the liver.

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mambaforstep  ahhhh i didnt know CYP450 played a role in vit D bioactivation/degradation. thanks! +8
mariame  Just to add: Vitamin D signal transduction system involves a series of cytochrome P450-containing sterol hydroxylases to generate and degrade the active hormone, 1ฮฑ,25-dihydroxyvitamin D3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3927478/ +1



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submitted by โˆ—amy(4)
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I get the P450 point, got it wrong bc anti-epileptic drugs such as carbamazepine and phenytoin decreases folate absorption, but maybe it is a different mechanism with vitamin D

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