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Metabolic study of pholcodine in urine using enzyme multiplied immunoassay technique (EMIT) and capillary gas chromatography.

A study of pholcodine metabolism in man is reported. Three subjects received a single therapeutic oral dose of 50 mg pholcodine and urine samples were collected as long as a positive opiate response could be detected by EMIT (16-26 days). Pholcodine was found to conjugate with glucuronic acid and 15% (13-17%) of the pholcodine dose was excreted in urine as the glucuronide, and 29% (24-35%) as unconjugated pholcodine. Morphine was detected to be a metabolite of pholcodine and 0.5-1% of the pholcodine dose was excreted as morphine glucuronide. The identity of morphine was confirmed by capillary gas chromatography-mass spectroscopy (GC-MS).