The principal cytochrome P450 isoenzyme involved appears to get CYP2E1, with CYP1A2 and CYP3A4 as extra pathways. About 85% of the oral dose seems during the urine within 24 hours of administration, most given that the glucuronide conjugate, with small amounts of other conjugates and unchanged drug. The commonest ones https://prxdirectory.com/listings13194699/codeine-in-english-options