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Related Experiment Videos

Long acting methadone formulations.

N H Choulis, L Abellana-Intaphan, P K Narang

    Die Pharmazie
    |May 1, 1978
    PubMed
    Summary

    Researchers developed long-acting methadone hydrochloride suspensions using spermaceti or Eudragit retard-1 for particle coating. In vivo studies in rats demonstrated sustained pain relief for over 75 hours, indicating potential for extended-release formulations.

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    Area of Science:

    • Pharmacology
    • Drug Delivery Systems

    Background:

    • Previous studies indicated the feasibility of producing long-acting methadone tablets.
    • Developing sustained-release formulations is crucial for improving patient compliance and therapeutic outcomes.

    Purpose of the Study:

    • To develop and evaluate long-acting methadone hydrochloride suspensions using novel particle coating techniques.
    • To assess the in vivo efficacy and duration of action of these methadone formulations.

    Main Methods:

    • Methadone hydrochloride suspensions were prepared using spermaceti or Eudragit retard-1 for particle coating.
    • Formulations were administered to Wistar rats, and pain threshold was measured to determine the duration of methadone's effect.
    • Methadone-naloxone combinations and novel methadone salts were also prepared and evaluated.

    Main Results:

    • Sustained pain relief was observed for over 75 hours in rats treated with the developed methadone suspensions.
    • The study successfully produced methadone suspensions at concentrations of 10, 20, and 30 mg/ml.
    • The methodology was extended to evaluate methadone-naloxone combinations and new methadone salts.

    Conclusions:

    • The developed methadone hydrochloride suspensions utilizing spermaceti or Eudragit retard-1 demonstrate significant potential for long-acting drug delivery.
    • In vivo studies confirm prolonged analgesic effects, supporting the feasibility of these formulations for extended-release methadone therapy.
    • Further investigation into methadone combinations and novel salts shows promise for tailored pain management strategies.

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