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APriori lithium dosage regimen using population characteristics of pharmacokinetic parameters

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Abstract

The important problem of initiation of long-term lithium treatments tackled by means of the selection of an a prioridosage regimen based on the presumed efficacy of lithium and absence of toxicity. The pharmacokinetics of Li + ion is represented by a four-compartment open model including the supposed first-order processes for the release of the active compound from the dosage form and its absorption. Experimental protocols for measurements of serum concentrations and of urinary amounts after single and multiple dosing to healthy volunteers were derived with several oral dosage forms. Estimation of the pharmacokinetic parameters for each subject made it possible to validate the model for the various dosage forms. The interindividual variability of these parameters is taken into account by estimating the characteristics of the statistical distribution for the whole population. A dosage regimen is considered optimum when serum concentration profiles at steady state range from the threshold of efficacy (0.8 mmol/liter) to the threshold of toxicity (2.0 mmol/liter). When the number of daily intakes is fixed, the search for the optimum dose for the whole population is effected by minimizing the expected value of the random variable which characterizes the risks of excursion out of the therapeutic range. By this means universal dosages are shown to be unsatisfactory. However, certain dosage regimens individualized with respect to the renal clearance value of lithium and based on two or three daily intakes can give excellent results even when conventional dosage forms are used.

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Author notes

  1. Jean-Louis J. Steimer & Alain J. Mallet

    Present address: Inserm U88, Departement de Biomathematiques, Groupe d'Etudes des Systemes Biologiques, F 756343, Paris Cedex 13, France

Authors and Affiliations

  1. Rhone-Poulenc, Division Sante, Institut de Biopharmacie, Departement de Biodynamique, F 92120, Montrouge, France

    Jean Gaillot & Albert Bieder

  2. Adersa-Gerbios, F 78140, Velizy-Villacoublay, France

    Jean-Louis J. Steimer & Alain J. Mallet

  3. Service de Medecine B (Dr. Blatrix), HÔpital Intercommunal, F 94000, Creteil, France

    Jean J. Thebault

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  1. Jean Gaillot
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  2. Jean-Louis J. Steimer
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  3. Alain J. Mallet
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  4. Jean J. Thebault
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Additional information

This work was partly supported by grants D.G.R.S.T. No. 75.7.1267 (Adersa-Gerbios) and No. 75.7.1268 (Theraplix Laboratory).

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Gaillot, J., Steimer, JL.J., Mallet, A.J. et al. APriori lithium dosage regimen using population characteristics of pharmacokinetic parameters. Journal of Pharmacokinetics and Biopharmaceutics 7, 579–628 (1979). https://doi.org/10.1007/BF01061210

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