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Doxylamine: a cause for false-positive gas chromatographic assay for phencyclidine

J D Schaldenbrand, K D McClatchey, J A Patel

Therapeutic Drug Monitoring

|January 1, 1981

Abstract:

A 25-year-old white woman ingested an unknown quantity of doxylamine succinate and flurazepam. Urine immunoassay screen (EMIT-dau) was positive for benzodiazopine and negative for phencyclidine. Subsequent gas chromatographic assay of the urine revealed a markedly positive assay for phencyclidine. Doxylamine was ultimately found to be the cause for the false-positive gas chromatographic assay for phencyclidine.

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