"Only the effect of 50 mg/kg vincamine is given. For smaller doses no significant effect could be detected.taarn wrote:Check the link for the paper:
https://bit.ly/2T9t5J1
"The reducing effect is a significant one but as compared to that caused by reserpin only of a minor degree, since complete depletion of serotonin is caused by a 5 mg/kg does of the latter within 2 hr."
"Our investigations showed however that this effect of vincamin is different from that of reserpin, being of lesser degree and developing more slowly."
"The diminishing effect of vincamin on noradrenalin level is more intensive sooner and more durable"
"The effects of vincamin on noradrenalin and serotonin level are probably due to different modes of action"
So, it seems that vincamine is too weak to affect serotonin much at the doses commonly available.