Urinary Excretion of Cocaine and Benzoylecgonine Following Oral Ingestion in a Single Subject

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Abstract
A 25 mg oral dose of cocaine HCI given to a single volunteer resulted in a peak urinary cocaine concentration of 269 ng/mL at 1 h, and a peak benzoylecgonine concentration of 7,940 ng/mL at 12 h. Urine benzoylecgonine concentrations remained in excess of 300 ng/mL for 48 h. We conclude that small, oral doses of cocaine, potentially undetectable to the user, may cause positive urine test results for at least 48 h using routine detection methods.