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European Journal of Clinical Pharmacology

, Volume 9, Issue 4, pp 291–298 | Cite as

Pharmacokinetics of lofepramine in man: Relationship to inhibition of noradrenaline uptake

  • G. Plym Forshell
  • B. Siwers
  • J. R. Tuck
Originals

Summary

The pharmacokinetics of lofepramine, an imipramine analogue, have been studied by administering single oral doses to volunteers, determination of plasma levels of lofepramine and desmethylimipramine after ten days of oral administration to patients, and by relating plasma levels to the effect on uptake of noradrenaline by isolated rat irides and brain slices of plasma samples collected during treatment. The results indicate that lofepramine undergoes pronounced first pass elimination and that desmethylimipramine is a major metabolite of it. During steady-state conditions the plasma level of lofepramine fluctuates considerably between doses. A linear relation was found between inhibition of neuronal uptake of noradrenaline and the plasma concentration of desmethylimpramine. No effect was seen on the uptake of 5-hydroxytryptamine in brain slices incubated in patients' plasma which suggests that neither lofepramine nor its metabolites formedin vivo in man affect neuronal uptake of this amine. Lofepramine belongs to the group of tricyclic anti-depressants which preferentially inhibit noradrenaline uptake.

Key words

Tricyclic antidepresent lofepramine single- and multiple-dose kinetics noradrenaline and 5-hydroxytryptamine uptake man 

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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • G. Plym Forshell
    • 1
    • 2
  • B. Siwers
    • 1
    • 2
  • J. R. Tuck
    • 1
    • 2
  1. 1.Research Laboratories, AB LeoHelsingborgSweden
  2. 2.Dept. of Clinical Pharmacology and PsychiatryHuddinge HospitalHuddingeSweden

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