Incorporation of Isotopically Labeled Cocaine and Metabolites into Human Hair: Dose-Response Relationships

    January 1996 in “ Journal of analytical toxicology.
    Gary L. Henderson, Martha R. Harkey, Carol L. Ecale Zhou, Reese T. Jones, Peyton Jacob
    Image of study
    TLDR Hair analysis can detect cocaine use but doesn't accurately show the amount or timing of use.
    Deuterium-labeled cocaine (cocaine-d5) was administered to 25 human volunteers in doses of 0.6–4.2 mg/kg, and samples were analyzed using GC-MS. Cocaine-d5 was the predominant analyte in hair, while benzoylecgonine-d5 (BZE-d5) was more prevalent in blood. The amount of cocaine-d5 in hair ranged from 0.1 to 5 ng/mg, with a detection threshold of 25–35 mg administered intravenously. Detection in hair lasted 2–6 months, but there was significant variability among subjects, with non-Caucasians incorporating more cocaine-d5 than Caucasians. The study suggested multiple mechanisms for cocaine incorporation into hair, such as sweat and sebum, and highlighted that hair analysis, while sensitive, did not accurately reflect the amount, time, or duration of drug use.
    Discuss this study in the Community →

    Related Community Posts Join

    6 / 1000+ results

      community Is there any new drug that looks promising ?

      in Research/Science  25 upvotes 1 year ago
      The conversation discusses GT20029, a drug in Phase II trials that targets androgen receptors with minimal systemic effects, and TDM-105795, a growth stimulant with a different mechanism than minoxidil that may revive papilla stem cells. Both are potential new treatments for hair loss.

      community Don't stop taking minoxidil no matter what

      in Minoxidil  9 upvotes 1 year ago
      The conversation is about hair loss treatments, specifically minoxidil, finasteride, and dutasteride. The main advice is to start with finasteride and never stop minoxidil once started, as stopping can lead to significant hair loss.

      community Summaries of Finasteride Studies

      in Research/Science  20 upvotes 1 week ago
      Finasteride is effective in promoting hair growth and reversing hair miniaturization in men with androgenetic alopecia, with improvements seen in various studies over different durations. Some users report initial side effects like ball ache, which often resolve as the body adjusts.

    Related Research

    1 / 1 results