A pain management patient has been prescribed oxycodone. His most recent drug test shows oxycodone at 9,815 ng/mL and oxymorphone below the cutoff. Oxymorphone is a metabolite of oxycodone and is generally detected at about 1/6th the concentration of oxycodone. What is a possible reason for not detecting oxymorphine?

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A pain management patient has been prescribed oxycodone. His most recent drug test shows oxycodone at 9,815 ng/mL and oxymorphone below the cutoff. Oxymorphone is a metabolite of oxycodone and is generally detected at about 1/6^th the concentration of oxycodone. What is a possible reason for not detecting oxymorphine?

Please select the single best answer

	The patient is taking Lexapro, a drug known to inhibit CYP enzymes.
	The patient is using Capsaicin, an inhibitor of CYP2E1.
	The patient is taking butalbital, a barbiturate known to induce CYP enzymes.
	The patient is taking St. John's wort, an inducer of CYP enzymes.