Pharma Quiz 2


Answer: B) The S-enantiomer
Explanation: Only the S-isomer of ibuprofen (dexibuprofen) actively inhibits COX enzymes. However, the body can convert about 60% of the inactive R-form into the active S-form. This is why most ibuprofen products contain a racemic (50/50) mixture - the body can utilize both forms effectively. Some newer formulations contain only the active S-ibuprofen to potentially reduce dosage requirements.

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