• Arzneimittel Forsch · Dec 1993

    Comparative Study

    Comparative pharmacokinetics of oral dextromethorphan and dextrorphan in the rabbit.

    • A Fossati, M G Vimercati, R Caputo, L Citerio, R Ceriani, and M Valenti.
    • Research and Development, Farmaceutici Formenti S.p.A., Milan, Italy.
    • Arzneimittel Forsch. 1993 Dec 1; 43 (12): 1337-40.

    AbstractThe pharmacokinetics of dextromethorphan (CAS 125-71-3) and its metabolite dextrorphan (CAS 125-73-5) was compared. The drugs were administered orally at the same molar dose of 0.085 mmol/kg. Plasma levels of dextromethorphan, dextrorphan, and metabolites 3-hydroxymorphinan and 3-methoxymorphinan were determined by HPLC with fluorimetric detection. Dextromethorphan was rapidly and extensively metabolized and the plasma profiles of dextrorphan, administered directly or as metabolite of dextromethorphan, were similar. The concentrations of 3-hydroxymorphinan were higher after dextromethorphan than dextrorphan. 3-Methoxymorphinan was detectable only 60 and 120 min after dextromethorphan. This work proposes the therapeutic use of dextrorphan instead of its precursor dextromethorphan.

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