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EEG profile of litoxetine after single and repeated administration in healthy volunteers.

1. Litoxetine is a selective serotonin reuptake inhibitor with antidepressant activity in animal models and in depressed patients. 2. This double-blind, cross-over, placebo-controlled study was carried out in 12 healthy young male volunteers. The aim was to assess the EEG profile of litoxetine in parallel with its pharmacokinetics after a single dose or multiple administrations for 4 days (6 doses) of two dosages (10 mg and 25 mg). Spectral analysis of four EEG leads (F4-T4, F3-T3, T4-02 and T3-01) was done up to 12 h post-dose. 3. In single or multiple doses, litoxetine induced EEG changes characterised by a dose-related increase in fast beta energies, mainly beta 2, without any changes in slow waves (delta and theta). A slight reduction in alpha activity occurred only after repeated doses. 4. EEG changes occurred after a single oral administration and lasted at least 12 h with litoxetine blood concentrations ranging from 4 to 10 ng ml-1. With repeated administrations, the pharmacodynamic steady-state was achieved as the increase in beta 2 energies was the same before and 12 h post-dose. These effects occurred with litoxetine blood concentrations ranging from 3 to 7 ng ml-1 with the 10 mg dosage and from 8 to 18 ng ml-1 with the 25 mg dosage. The EEG profile did not change after 4 days of repeated administration, indicating that tolerance did not develop. 5. Cmax and AUC showed proportionality between the administered dosages of 10 and 25 mg.(ABSTRACT TRUNCATED AT 250 WORDS)[1]

References

  1. EEG profile of litoxetine after single and repeated administration in healthy volunteers. Patat, A., Trocherie, S., Thébault, J.J., Rosenzweig, P., Dubruc, C., Bianchetti, G., Morselli, P.L., Court, L.A. British journal of clinical pharmacology. (1994) [Pubmed]
 
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