Pharmacodynamics of venlafaxine evaluated by EEG brain mapping, psychometry and psychophysiology.

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Abstract
1. In a double‐blind, placebo‐controlled study the effects of venlafaxine‐a novel nontricyclic compound inhibiting neuronal uptake of serotonin, noradrenaline and to a lesser extent dopamine‐were investigated utilizing EEG brain mapping, psychometric and psychophysiological measures. 2. Sixteen healthy volunteers (eight males, eight females) aged 21‐36 years received randomized and at weekly intervals single oral doses of placebo, 12.5 mg, 25 mg and 50 mg venlafaxine. EEG recordings, psychometric and psychophysiological tests, and evaluation of pulse, blood pressure and side‐effects were carried out at 0, 2, 4, 6, and 8 h. 3. EEG brain mapping demonstrated that venlafaxine exerted a significant action on human brain function as compared with placebo at all three doses, characterized mostly by attenuation of absolute power, increase of relative delta/theta and beta, and decrease of alpha power, as well as by an acceleration of the total centroid fronto‐temporally and by its slowing centrally and parietally. These findings are similar to antidepressants such as imipramine. Topographically, drug‐induced alterations were most pronounced over both fronto‐temporal and the right temporal to temporo‐ occipital regions. 4. Psychometric and psychophysiological investigations demonstrated significant dose‐dependent psychotropic properties of the drug. Multivariate statistics exhibited an improvement of both the noopsyche (e.g. attention, concentration, attention variability, memory, fine motor activity, reaction time performance) and thymopsyche (e.g. drive, wakefulness)) but also significant psychophysiological activation (e.g. in c.f.f., pupillary and skin conductance measures). 5. Time‐efficiency calculations showed significant central effects from the 2nd hour onwards, with increasing differences between placebo and treatment up to the 8th hour. Nausea was the most frequent complaint and appeared dose dependent.

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