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Related Experiment Videos

Bioavailability of methotrexate: implications for clinical use.

J F Stuart, K C Calman, J Watters

    Cancer Chemotherapy and Pharmacology
    |January 1, 1979
    PubMed
    Summary

    Oral methotrexate absorption varies, with lower bioavailability than IV doses. Longer methotrexate half-life correlates with partial treatment response, aiding in monitoring drug efficacy and toxicity.

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    Area of Science:

    • Pharmacokinetics
    • Oncology

    Background:

    • Methotrexate is a chemotherapy agent used for various cancers.
    • Understanding its oral absorption and pharmacokinetic profile is crucial for optimizing treatment.

    Purpose of the Study:

    • To compare the bioavailability of oral methotrexate syrup versus intravenous administration.
    • To investigate the relationship between methotrexate pharmacokinetics, treatment response, and toxicity in cancer patients.

    Main Methods:

    • Oral and intravenous methotrexate doses were administered to six patients to assess absorption.
    • Thirty-three patients receiving methotrexate for various tumors were monitored for treatment response and toxicity.
    • Methotrexate half-life (t1/2), serum, and urine levels were measured.

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    Main Results:

    • Oral methotrexate absorption was variable, with lower area under the curve compared to intravenous dosing.
    • A significantly longer methotrexate half-life was observed in partial responders (9.2 h) versus non-responders (3.8 h).
    • Mild toxicities like mucositis and diarrhea occurred, but severe toxicity was not observed and could not be predicted by dose or bioavailability.

    Conclusions:

    • Oral methotrexate syrup exhibits variable absorption and lower bioavailability than IV administration.
    • Methotrexate half-life is a potential predictor of treatment response in cancer patients.
    • Monitoring serum and urine methotrexate levels is valuable for assessing drug absorption, bioavailability, and predicting treatment outcomes.