Drug compositions

US4223004A · kind A · utility

Assignee

• The Governing Council of the University of Toronto · CA

Inventors

• Jen-Chang Hsia · Irvine, US
• Arthur E. Le Blanc · Toronto, CA
• Joan A. Marshman · Markham, CA

Key dates

• Filing date: May 23, 1977
• Grant date: Sep 16, 1980
• Expiry date: May 23, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/24
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Monitorable drug compositions contain known proportions by weight of a drug e.g. methadone and an isotopic analogue e.g. deuterated methadone. A urine specimen or blood specimen can be tested to reveal whether the proportion of the two constituents in the urine is the same as the proportion in the composition that was prescribed to the patient. A discrepancy will reveal that the patient has supplemented his dosage with drugs obtained from another source.